Merge pull request #2653 from Zero-Free/pm_dev

改进低功耗组件

17 files changed, 1026 insertions, 516 deletions

diff --git a/bsp/es32f0334/drivers/drv_pm.c b/bsp/es32f0334/drivers/drv_pm.c
index f9324d7208..22f2c43073 100644
--- a/bsp/es32f0334/drivers/drv_pm.c
+++ b/bsp/es32f0334/drivers/drv_pm.c
@@ -6,6 +6,7 @@
  * Change Logs:
  * Date           Author        Notes
  * 2019-04-08     wangyq        the first version
+ * 2019-05-06     Zero-Free     adapt to the new power management interface
  */
 
 #include <rthw.h>
@@ -16,52 +17,26 @@
 
 #ifdef RT_USING_PM
 
-static void _drv_pm_enter(struct rt_pm *pm)
+static void _drv_pm_enter(struct rt_pm *pm, uint8_t mode)
 {
-    rt_uint32_t mode;
-
-    mode = pm->current_mode;
-
     switch (mode)
     {
-    case PM_RUN_MODE_NORMAL:
+    case PM_SLEEP_MODE_NONE:
         break;
 
-    case PM_SLEEP_MODE_SLEEP:
+    case PM_SLEEP_MODE_IDLE:
         __WFI();
         break;
 
-    case PM_SLEEP_MODE_TIMER:
-        pmu_stop2_enter();
-        break;
-
-    case PM_SLEEP_MODE_SHUTDOWN:
-        pmu_standby_enter(PMU_STANDBY_PORT_NONE);
-        break;
-
-    default:
-        RT_ASSERT(0);
-        break;
-    }
-}
-
-static void _drv_pm_exit(struct rt_pm *pm)
-{
-    rt_uint32_t mode;
-
-    RT_ASSERT(pm != RT_NULL);
-
-    mode = pm->current_mode;
-
-    switch (mode)
-    {
-    case PM_RUN_MODE_NORMAL:
+    case PM_SLEEP_MODE_LIGHT:
         break;
 
-    case PM_SLEEP_MODE_SLEEP:
+    case PM_SLEEP_MODE_DEEP:
+        pmu_stop2_enter();
         break;
 
-    case PM_SLEEP_MODE_TIMER:
+    case PM_SLEEP_MODE_STANDBY:
+        pmu_standby_enter(PMU_STANDBY_PORT_NONE);
         break;
 
     case PM_SLEEP_MODE_SHUTDOWN:
@@ -73,32 +48,21 @@ static void _drv_pm_exit(struct rt_pm *pm)
     }
 }
 
-#if PM_RUN_MODE_COUNT > 1
-static void _drv_pm_frequency_change(struct rt_pm *pm, rt_uint32_t frequency)
-{
-    return;
-}
-#endif
-
 static int drv_hw_pm_init(void)
 {
     static const struct rt_pm_ops _ops =
     {
         _drv_pm_enter,
-        _drv_pm_exit,
-
-#if PM_RUN_MODE_COUNT > 1
-        _drv_pm_frequency_change,
-#endif
+        RT_NULL,
         RT_NULL,
         RT_NULL,
         RT_NULL
     };
 
-    rt_uint8_t timer_mask;
+    rt_uint8_t timer_mask = 0;
 
-    /* initialize timer mask */
-    timer_mask = 1UL << PM_SLEEP_MODE_TIMER;
+    /* initialize timer mask(no need tickless) */
+    // timer_mask = 1UL << PM_SLEEP_MODE_DEEP;
 
     /* initialize system pm module */
     rt_system_pm_init(&_ops, timer_mask, RT_NULL);
diff --git a/bsp/es32f0654/drivers/drv_pm.c b/bsp/es32f0654/drivers/drv_pm.c
index 256634b81d..aa2f07ec68 100644
--- a/bsp/es32f0654/drivers/drv_pm.c
+++ b/bsp/es32f0654/drivers/drv_pm.c
@@ -6,6 +6,7 @@
  * Change Logs:
  * Date           Author        Notes
  * 2019-04-01     wangyq        the first version
+ * 2019-05-06     Zero-Free     adapt to the new power management interface
  */
 
 #include <rthw.h>
@@ -16,52 +17,26 @@
 
 #ifdef RT_USING_PM
 
-static void _drv_pm_enter(struct rt_pm *pm)
+static void _drv_pm_enter(struct rt_pm *pm, uint8_t mode)
 {
-    rt_uint32_t mode;
-
-    mode = pm->current_mode;
-
     switch (mode)
     {
-    case PM_RUN_MODE_NORMAL:
+    case PM_SLEEP_MODE_NONE:
         break;
 
-    case PM_SLEEP_MODE_SLEEP:
+    case PM_SLEEP_MODE_IDLE:
         __WFI();
         break;
 
-    case PM_SLEEP_MODE_TIMER:
-        pmu_stop2_enter();
-        break;
-
-    case PM_SLEEP_MODE_SHUTDOWN:
-        pmu_standby_enter(PMU_STANDBY_PORT_NONE);
-        break;
-
-    default:
-        RT_ASSERT(0);
-        break;
-    }
-}
-
-static void _drv_pm_exit(struct rt_pm *pm)
-{
-    rt_uint32_t mode;
-
-    RT_ASSERT(pm != RT_NULL);
-
-    mode = pm->current_mode;
-
-    switch (mode)
-    {
-    case PM_RUN_MODE_NORMAL:
+    case PM_SLEEP_MODE_LIGHT:
         break;
 
-    case PM_SLEEP_MODE_SLEEP:
+    case PM_SLEEP_MODE_DEEP:
+        pmu_stop2_enter();
         break;
 
-    case PM_SLEEP_MODE_TIMER:
+    case PM_SLEEP_MODE_STANDBY:
+        pmu_standby_enter(PMU_STANDBY_PORT_NONE);
         break;
 
     case PM_SLEEP_MODE_SHUTDOWN:
@@ -73,32 +48,21 @@ static void _drv_pm_exit(struct rt_pm *pm)
     }
 }
 
-#if PM_RUN_MODE_COUNT > 1
-static void _drv_pm_frequency_change(struct rt_pm *pm, rt_uint32_t frequency)
-{
-    return;
-}
-#endif
-
 static int drv_hw_pm_init(void)
 {
     static const struct rt_pm_ops _ops =
     {
         _drv_pm_enter,
-        _drv_pm_exit,
-
-#if PM_RUN_MODE_COUNT > 1
-        _drv_pm_frequency_change,
-#endif
+        RT_NULL,
         RT_NULL,
         RT_NULL,
         RT_NULL
     };
 
-    rt_uint8_t timer_mask;
+    rt_uint8_t timer_mask = 0;
 
-    /* initialize timer mask */
-    timer_mask = 1UL << PM_SLEEP_MODE_TIMER;
+    /* initialize timer mask(no need tickless) */
+    timer_mask = 1UL << PM_SLEEP_MODE_DEEP;
 
     /* initialize system pm module */
     rt_system_pm_init(&_ops, timer_mask, RT_NULL);
diff --git a/bsp/stm32/libraries/HAL_Drivers/SConscript b/bsp/stm32/libraries/HAL_Drivers/SConscript
index 413cc61a7b..99f1e9e520 100644
--- a/bsp/stm32/libraries/HAL_Drivers/SConscript
+++ b/bsp/stm32/libraries/HAL_Drivers/SConscript
@@ -39,6 +39,10 @@ if GetDepend(['RT_USING_ADC']):
 if GetDepend(['RT_USING_CAN']):
     src += ['drv_can.c']
 
+if GetDepend(['RT_USING_PM', 'SOC_SERIES_STM32L4']):
+    src += ['drv_pm.c']
+    src += ['drv_lptim.c']
+
 if GetDepend('BSP_USING_SDRAM'):
     src += ['drv_sdram.c']
 
diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_lptim.c b/bsp/stm32/libraries/HAL_Drivers/drv_lptim.c
new file mode 100644
index 0000000000..64e602fa52
--- /dev/null
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_lptim.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author          Notes
+ * 2019-05-06     Zero-Free       first version
+ */
+
+#include <board.h>
+#include <drv_lptim.h>
+
+static LPTIM_HandleTypeDef LptimHandle;
+
+void HAL_LPTIM_MspInit(LPTIM_HandleTypeDef *hlptim)
+{
+    if (hlptim->Instance == LPTIM1)
+    {
+        /* Peripheral clock enable */
+        __HAL_RCC_LPTIM1_CLK_ENABLE();
+    }
+}
+
+void LPTIM1_IRQHandler(void)
+{
+    HAL_LPTIM_IRQHandler(&LptimHandle);
+}
+
+void HAL_LPTIM_CompareMatchCallback(LPTIM_HandleTypeDef *hlptim)
+{
+    /* enter interrupt */
+    rt_interrupt_enter();
+
+    /* leave interrupt */
+    rt_interrupt_leave();
+}
+
+/**
+ * This function get current count value of LPTIM
+ *
+ * @return the count vlaue
+ */
+rt_uint32_t stm32l4_lptim_get_current_tick(void)
+{
+    return HAL_LPTIM_ReadCounter(&LptimHandle);
+}
+
+/**
+ * This function get the max value that LPTIM can count
+ *
+ * @return the max count
+ */
+rt_uint32_t stm32l4_lptim_get_tick_max(void)
+{
+    return (0xFFFF);
+}
+
+/**
+ * This function start LPTIM with reload value
+ *
+ * @param reload The value that LPTIM count down from
+ *
+ * @return RT_EOK
+ */
+rt_err_t stm32l4_lptim_start(rt_uint32_t reload)
+{
+    HAL_LPTIM_TimeOut_Start_IT(&LptimHandle, 0xFFFF, reload);
+
+    return (RT_EOK);
+}
+
+/**
+ * This function stop LPTIM
+ */
+void stm32l4_lptim_stop(void)
+{
+    rt_uint32_t _ier;
+
+    _ier = LptimHandle.Instance->IER;
+    LptimHandle.Instance->ICR = LptimHandle.Instance->ISR & _ier;
+}
+
+/**
+ * This function get the count clock of LPTIM
+ *
+ * @return the count clock frequency in Hz
+ */
+rt_uint32_t stm32l4_lptim_get_countfreq(void)
+{
+    return 32000 / 32;
+}
+
+/**
+ * This function initialize the lptim
+ */
+int stm32l4_hw_lptim_init(void)
+{
+    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+    RCC_PeriphCLKInitTypeDef RCC_PeriphCLKInitStruct = {0};
+
+    /* Enable LSI clock */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI;
+    RCC_OscInitStruct.LSIState = RCC_LSI_ON;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
+    HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+    /* Select the LSI clock as LPTIM peripheral clock */
+    RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_LPTIM1;
+    RCC_PeriphCLKInitStruct.Lptim1ClockSelection = RCC_LPTIM1CLKSOURCE_LSI;
+    HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct);
+
+    LptimHandle.Instance = LPTIM1;
+    LptimHandle.Init.Clock.Source = LPTIM_CLOCKSOURCE_APBCLOCK_LPOSC;
+    LptimHandle.Init.Clock.Prescaler = LPTIM_PRESCALER_DIV32;
+    LptimHandle.Init.Trigger.Source = LPTIM_TRIGSOURCE_SOFTWARE;
+    LptimHandle.Init.OutputPolarity = LPTIM_OUTPUTPOLARITY_HIGH;
+    LptimHandle.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE;
+    LptimHandle.Init.CounterSource = LPTIM_COUNTERSOURCE_INTERNAL;
+    if (HAL_LPTIM_Init(&LptimHandle) != HAL_OK)
+    {
+        return -1;
+    }
+
+    NVIC_ClearPendingIRQ(LPTIM1_IRQn);
+    NVIC_SetPriority(LPTIM1_IRQn, 0);
+    NVIC_EnableIRQ(LPTIM1_IRQn);
+
+    return 0;
+}
+
+INIT_DEVICE_EXPORT(stm32l4_hw_lptim_init);
diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_lptim.h b/bsp/stm32/libraries/HAL_Drivers/drv_lptim.h
new file mode 100644
index 0000000000..0fd51b5eac
--- /dev/null
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_lptim.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author          Notes
+ * 2019-05-06     Zero-Free       first version
+ */
+
+#ifndef  __DRV_PMTIMER_H__
+#define  __DRV_PMTIMER_H__
+
+#include <rtthread.h>
+
+rt_uint32_t stm32l4_lptim_get_countfreq(void);
+rt_uint32_t stm32l4_lptim_get_tick_max(void);
+rt_uint32_t stm32l4_lptim_get_current_tick(void);
+
+rt_err_t stm32l4_lptim_start(rt_uint32_t load);
+void stm32l4_lptim_stop(void);
+
+#endif /* __DRV_PMTIMER_H__ */
diff --git a/bsp/stm32/libraries/HAL_Drivers/drv_pm.c b/bsp/stm32/libraries/HAL_Drivers/drv_pm.c
new file mode 100644
index 0000000000..84ddf6cd41
--- /dev/null
+++ b/bsp/stm32/libraries/HAL_Drivers/drv_pm.c
@@ -0,0 +1,248 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-05-06     Zero-Free    first version
+ */
+
+#include <board.h>
+#include <drv_lptim.h>
+
+static void uart_console_reconfig(void)
+{
+    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
+
+    rt_device_control(rt_console_get_device(), RT_DEVICE_CTRL_CONFIG, &config);
+}
+
+/**
+ * This function will put STM32L4xx into sleep mode.
+ *
+ * @param pm pointer to power manage structure
+ */
+static void sleep(struct rt_pm *pm, uint8_t mode)
+{
+    switch (mode)
+    {
+    case PM_SLEEP_MODE_NONE:
+        break;
+
+    case PM_SLEEP_MODE_IDLE:
+        // __WFI();
+        break;
+
+    case PM_SLEEP_MODE_LIGHT:
+        if (pm->run_mode == PM_RUN_MODE_LOW_SPEED)
+        {
+            /* Enter LP SLEEP Mode, Enable low-power regulator */
+            HAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFI);
+        }
+        else
+        {
+            /* Enter SLEEP Mode, Main regulator is ON */
+            HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
+        }
+        break;
+
+    case PM_SLEEP_MODE_DEEP:
+        /* Enter STOP 2 mode  */
+        HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);
+        /* Re-configure the system clock */
+        SystemClock_ReConfig(pm->run_mode);
+        break;
+
+    case PM_SLEEP_MODE_STANDBY:
+        /* Enter STANDBY mode */
+        HAL_PWR_EnterSTANDBYMode();
+        break;
+
+    case PM_SLEEP_MODE_SHUTDOWN:
+        /* Enter SHUTDOWNN mode */
+        HAL_PWREx_EnterSHUTDOWNMode();
+        break;
+
+    default:
+        RT_ASSERT(0);
+        break;
+    }
+}
+
+static uint8_t run_speed[PM_RUN_MODE_MAX][2] =
+{
+    {80, 0},
+    {80, 1},
+    {24, 2},
+    {2,  3},
+};
+
+static void run(struct rt_pm *pm, uint8_t mode)
+{
+    static uint8_t last_mode;
+    static char *run_str[] = PM_RUN_MODE_NAMES;
+
+    if (mode == last_mode)
+        return;
+    last_mode = mode;
+
+    /* 1. 设置 MSI 作为 SYSCLK 时钟源,以修改 PLL */
+    SystemClock_MSI_ON();
+
+    /* 2. 根据RUN模式切换时钟频率(HSI) */
+    switch (mode)
+    {
+    case PM_RUN_MODE_HIGH_SPEED:
+    case PM_RUN_MODE_NORMAL_SPEED:
+        SystemClock_80M();
+        /* Configure the main internal regulator output voltage (Range1 by default)*/
+        HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
+        break;
+    case PM_RUN_MODE_MEDIUM_SPEED:
+        SystemClock_24M();
+        /* Configure the main internal regulator output voltage */
+        HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE2);
+        break;
+    case PM_RUN_MODE_LOW_SPEED:
+        SystemClock_2M();
+        /* Enter LP RUN mode */
+        HAL_PWREx_EnableLowPowerRunMode();
+        break;
+    default:
+        break;
+    }
+
+    /* 3. 关闭 MSI 时钟 */
+    // SystemClock_MSI_OFF();
+
+    /* 4. 更新外设时钟 */
+    uart_console_reconfig();
+    /* Re-Configure the Systick time */
+    HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq() / RT_TICK_PER_SECOND);
+    /* Re-Configure the Systick */
+    HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
+
+    rt_kprintf("switch to %s mode, frequency = %d MHz\n", run_str[mode], run_speed[mode][0]);
+}
+
+/**
+ * This function caculate the PM tick from OS tick
+ *
+ * @param tick OS tick
+ *
+ * @return the PM tick
+ */
+static rt_tick_t stm32l4_pm_tick_from_os_tick(rt_tick_t tick)
+{
+    rt_uint32_t freq = stm32l4_lptim_get_countfreq();
+
+    return (freq * tick / RT_TICK_PER_SECOND);
+}
+
+/**
+ * This function caculate the OS tick from PM tick
+ *
+ * @param tick PM tick
+ *
+ * @return the OS tick
+ */
+static rt_tick_t stm32l4_os_tick_from_pm_tick(rt_uint32_t tick)
+{
+    static rt_uint32_t os_tick_remain = 0;
+    rt_uint32_t ret, freq;
+
+    freq = stm32l4_lptim_get_countfreq();
+    ret = (tick * RT_TICK_PER_SECOND + os_tick_remain) / freq;
+
+    os_tick_remain += (tick * RT_TICK_PER_SECOND);
+    os_tick_remain %= freq;
+
+    return ret;
+}
+
+/**
+ * This function start the timer of pm
+ *
+ * @param pm Pointer to power manage structure
+ * @param timeout How many OS Ticks that MCU can sleep
+ */
+static void pm_timer_start(struct rt_pm *pm, rt_uint32_t timeout)
+{
+    RT_ASSERT(pm != RT_NULL);
+    RT_ASSERT(timeout > 0);
+
+    if (timeout != RT_TICK_MAX)
+    {
+        /* Convert OS Tick to pmtimer timeout value */
+        timeout = stm32l4_pm_tick_from_os_tick(timeout);
+        if (timeout > stm32l4_lptim_get_tick_max())
+        {
+            timeout = stm32l4_lptim_get_tick_max();
+        }
+
+        /* Enter PM_TIMER_MODE */
+        stm32l4_lptim_start(timeout);
+    }
+}
+
+/**
+ * This function stop the timer of pm
+ *
+ * @param pm Pointer to power manage structure
+ */
+static void pm_timer_stop(struct rt_pm *pm)
+{
+    RT_ASSERT(pm != RT_NULL);
+
+    /* Reset pmtimer status */
+    stm32l4_lptim_stop();
+}
+
+/**
+ * This function calculate how many OS Ticks that MCU have suspended
+ *
+ * @param pm Pointer to power manage structure
+ *
+ * @return OS Ticks
+ */
+static rt_tick_t pm_timer_get_tick(struct rt_pm *pm)
+{
+    rt_uint32_t timer_tick;
+
+    RT_ASSERT(pm != RT_NULL);
+
+    timer_tick = stm32l4_lptim_get_current_tick();
+
+    return stm32l4_os_tick_from_pm_tick(timer_tick);
+}
+
+/**
+ * This function initialize the power manager
+ */
+int drv_pm_hw_init(void)
+{
+    static const struct rt_pm_ops _ops =
+    {
+        sleep,
+        run,
+        pm_timer_start,
+        pm_timer_stop,
+        pm_timer_get_tick
+    };
+
+    rt_uint8_t timer_mask = 0;
+
+    /* Enable Power Clock */
+    __HAL_RCC_PWR_CLK_ENABLE();
+
+    /* initialize timer mask */
+    timer_mask = 1UL << PM_SLEEP_MODE_DEEP;
+
+    /* initialize system pm module */
+    rt_system_pm_init(&_ops, timer_mask, RT_NULL);
+
+    return 0;
+}
+
+INIT_BOARD_EXPORT(drv_pm_hw_init);
diff --git a/bsp/stm32/libraries/STM32L4xx_HAL/SConscript b/bsp/stm32/libraries/STM32L4xx_HAL/SConscript
index 5b130f5aa3..5eb48c406c 100644
--- a/bsp/stm32/libraries/STM32L4xx_HAL/SConscript
+++ b/bsp/stm32/libraries/STM32L4xx_HAL/SConscript
@@ -84,6 +84,9 @@ if GetDepend(['RT_USING_MTD_NOR']):
 if GetDepend(['RT_USING_MTD_NAND']):
     src += ['STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_nand.c']
 
+if GetDepend(['RT_USING_PM']):
+    src += ['STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_lptim.c']
+
 if GetDepend(['BSP_USING_ON_CHIP_FLASH']):
     src += ['STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_flash.c']
     src += ['STM32L4xx_HAL_Driver/Src/stm32l4xx_hal_flash_ex.c']
diff --git a/bsp/stm32/stm32l476-st-nucleo/.config b/bsp/stm32/stm32l476-st-nucleo/.config
index 0731ce4782..460cc52d06 100644
--- a/bsp/stm32/stm32l476-st-nucleo/.config
+++ b/bsp/stm32/stm32l476-st-nucleo/.config
@@ -7,6 +7,7 @@
 # RT-Thread Kernel
 #
 CONFIG_RT_NAME_MAX=8
+# CONFIG_RT_USING_ARCH_DATA_TYPE is not set
 # CONFIG_RT_USING_SMP is not set
 CONFIG_RT_ALIGN_SIZE=4
 # CONFIG_RT_THREAD_PRIORITY_8 is not set
@@ -18,7 +19,7 @@ CONFIG_RT_USING_OVERFLOW_CHECK=y
 CONFIG_RT_USING_HOOK=y
 CONFIG_RT_USING_IDLE_HOOK=y
 CONFIG_RT_IDEL_HOOK_LIST_SIZE=4
-CONFIG_IDLE_THREAD_STACK_SIZE=256
+CONFIG_IDLE_THREAD_STACK_SIZE=1024
 # CONFIG_RT_USING_TIMER_SOFT is not set
 CONFIG_RT_DEBUG=y
 CONFIG_RT_DEBUG_COLOR=y
@@ -111,6 +112,7 @@ CONFIG_FINSH_ARG_MAX=10
 #
 CONFIG_RT_USING_DEVICE_IPC=y
 CONFIG_RT_PIPE_BUFSZ=512
+# CONFIG_RT_USING_SYSTEM_WORKQUEUE is not set
 CONFIG_RT_USING_SERIAL=y
 CONFIG_RT_SERIAL_USING_DMA=y
 CONFIG_RT_SERIAL_RB_BUFSZ=64
@@ -124,13 +126,15 @@ CONFIG_RT_USING_PIN=y
 # CONFIG_RT_USING_MTD_NOR is not set
 # CONFIG_RT_USING_MTD_NAND is not set
 # CONFIG_RT_USING_MTD is not set
-# CONFIG_RT_USING_PM is not set
+CONFIG_RT_USING_PM=y
 CONFIG_RT_USING_RTC=y
+# CONFIG_RT_USING_ALARM is not set
 # CONFIG_RT_USING_SOFT_RTC is not set
 # CONFIG_RT_USING_SDIO is not set
 # CONFIG_RT_USING_SPI is not set
 # CONFIG_RT_USING_WDT is not set
 # CONFIG_RT_USING_AUDIO is not set
+# CONFIG_RT_USING_SENSOR is not set
 
 #
 # Using WiFi
@@ -159,6 +163,11 @@ CONFIG_RT_USING_LIBC=y
 # CONFIG_RT_USING_SAL is not set
 
 #
+# Network interface device
+#
+# CONFIG_RT_USING_NETDEV is not set
+
+#
 # light weight TCP/IP stack
 #
 # CONFIG_RT_USING_LWIP is not set
@@ -181,16 +190,9 @@ CONFIG_RT_USING_LIBC=y
 #
 # Utilities
 #
-# CONFIG_RT_USING_LOGTRACE is not set
 # CONFIG_RT_USING_RYM is not set
 # CONFIG_RT_USING_ULOG is not set
 # CONFIG_RT_USING_UTEST is not set
-
-#
-# ARM CMSIS
-#
-# CONFIG_RT_USING_CMSIS_OS is not set
-# CONFIG_RT_USING_RTT_CMSIS is not set
 # CONFIG_RT_USING_LWP is not set
 
 #
@@ -202,10 +204,12 @@ CONFIG_RT_USING_LIBC=y
 #
 # CONFIG_PKG_USING_PAHOMQTT is not set
 # CONFIG_PKG_USING_WEBCLIENT is not set
+# CONFIG_PKG_USING_WEBNET is not set
 # CONFIG_PKG_USING_MONGOOSE is not set
 # CONFIG_PKG_USING_WEBTERMINAL is not set
 # CONFIG_PKG_USING_CJSON is not set
 # CONFIG_PKG_USING_JSMN is not set
+# CONFIG_PKG_USING_LIBMODBUS is not set
 # CONFIG_PKG_USING_LJSON is not set
 # CONFIG_PKG_USING_EZXML is not set
 # CONFIG_PKG_USING_NANOPB is not set
@@ -223,6 +227,7 @@ CONFIG_RT_USING_LIBC=y
 # Wiced WiFi
 #
 # CONFIG_PKG_USING_WLAN_WICED is not set
+# CONFIG_PKG_USING_RW007 is not set
 # CONFIG_PKG_USING_COAP is not set
 # CONFIG_PKG_USING_NOPOLL is not set
 # CONFIG_PKG_USING_NETUTILS is not set
@@ -236,6 +241,9 @@ CONFIG_RT_USING_LIBC=y
 # CONFIG_PKG_USING_GAGENT_CLOUD is not set
 # CONFIG_PKG_USING_ALI_IOTKIT is not set
 # CONFIG_PKG_USING_AZURE is not set
+# CONFIG_PKG_USING_TENCENT_IOTKIT is not set
+# CONFIG_PKG_USING_NIMBLE is not set
+# CONFIG_PKG_USING_OTA_DOWNLOADER is not set
 
 #
 # security packages
@@ -256,6 +264,7 @@ CONFIG_RT_USING_LIBC=y
 #
 # CONFIG_PKG_USING_OPENMV is not set
 # CONFIG_PKG_USING_MUPDF is not set
+# CONFIG_PKG_USING_STEMWIN is not set
 
 #
 # tools packages
@@ -267,6 +276,7 @@ CONFIG_RT_USING_LIBC=y
 # CONFIG_PKG_USING_RDB is not set
 # CONFIG_PKG_USING_QRCODE is not set
 # CONFIG_PKG_USING_ULOG_EASYFLASH is not set
+# CONFIG_PKG_USING_ADBD is not set
 
 #
 # system packages
@@ -283,10 +293,13 @@ CONFIG_RT_USING_LIBC=y
 # CONFIG_PKG_USING_LITTLEVGL2RTT is not set
 # CONFIG_PKG_USING_CMSIS is not set
 # CONFIG_PKG_USING_DFS_YAFFS is not set
+# CONFIG_PKG_USING_LITTLEFS is not set
+# CONFIG_PKG_USING_THREAD_POOL is not set
 
 #
 # peripheral libraries and drivers
 #
+# CONFIG_PKG_USING_SENSORS_DRIVERS is not set
 # CONFIG_PKG_USING_REALTEK_AMEBA is not set
 # CONFIG_PKG_USING_SHT2X is not set
 # CONFIG_PKG_USING_AHT10 is not set
@@ -294,6 +307,16 @@ CONFIG_RT_USING_LIBC=y
 # CONFIG_PKG_USING_STM32_SDIO is not set
 # CONFIG_PKG_USING_ICM20608 is not set
 # CONFIG_PKG_USING_U8G2 is not set
+# CONFIG_PKG_USING_BUTTON is not set
+# CONFIG_PKG_USING_MPU6XXX is not set
+# CONFIG_PKG_USING_PCF8574 is not set
+# CONFIG_PKG_USING_SX12XX is not set
+# CONFIG_PKG_USING_SIGNAL_LED is not set
+# CONFIG_PKG_USING_WM_LIBRARIES is not set
+# CONFIG_PKG_USING_KENDRYTE_SDK is not set
+# CONFIG_PKG_USING_INFRARED is not set
+# CONFIG_PKG_USING_ROSSERIAL is not set
+# CONFIG_PKG_USING_AT24CXX is not set
 
 #
 # miscellaneous packages
@@ -308,10 +331,7 @@ CONFIG_RT_USING_LIBC=y
 # CONFIG_PKG_USING_ZLIB is not set
 # CONFIG_PKG_USING_DSTR is not set
 # CONFIG_PKG_USING_TINYFRAME is not set
-
-#
-# sample package
-#
+# CONFIG_PKG_USING_KENDRYTE_DEMO is not set
 
 #
 # samples: kernel and components samples
@@ -320,11 +340,9 @@ CONFIG_RT_USING_LIBC=y
 # CONFIG_PKG_USING_FILESYSTEM_SAMPLES is not set
 # CONFIG_PKG_USING_NETWORK_SAMPLES is not set
 # CONFIG_PKG_USING_PERIPHERAL_SAMPLES is not set
-
-#
-# example package: hello
-#
 # CONFIG_PKG_USING_HELLO is not set
+# CONFIG_PKG_USING_VI is not set
+# CONFIG_PKG_USING_NNOM is not set
 CONFIG_SOC_FAMILY_STM32=y
 CONFIG_SOC_SERIES_STM32L4=y
 
diff --git a/bsp/stm32/stm32l476-st-nucleo/board/CubeMX_Config/Inc/stm32l4xx_hal_conf.h b/bsp/stm32/stm32l476-st-nucleo/board/CubeMX_Config/Inc/stm32l4xx_hal_conf.h
index b663dfd264..9cf0bbaca2 100644
--- a/bsp/stm32/stm32l476-st-nucleo/board/CubeMX_Config/Inc/stm32l4xx_hal_conf.h
+++ b/bsp/stm32/stm32l476-st-nucleo/board/CubeMX_Config/Inc/stm32l4xx_hal_conf.h
@@ -69,7 +69,7 @@
 /*#define HAL_IWDG_MODULE_ENABLED   */
 /*#define HAL_LTDC_MODULE_ENABLED   */
 /*#define HAL_LCD_MODULE_ENABLED   */
-/*#define HAL_LPTIM_MODULE_ENABLED   */
+#define HAL_LPTIM_MODULE_ENABLED
 /*#define HAL_NAND_MODULE_ENABLED   */
 /*#define HAL_NOR_MODULE_ENABLED   */
 /*#define HAL_OPAMP_MODULE_ENABLED   */
diff --git a/bsp/stm32/stm32l476-st-nucleo/board/board.c b/bsp/stm32/stm32l476-st-nucleo/board/board.c
index b4fcfe0a84..88600d4b4f 100644
--- a/bsp/stm32/stm32l476-st-nucleo/board/board.c
+++ b/bsp/stm32/stm32l476-st-nucleo/board/board.c
@@ -5,62 +5,237 @@
  *
  * Change Logs:
  * Date           Author       Notes
- * 2019-02-05     gw        first version
+ * 2019-02-05     gw           first version
+ * 2019-05-05     Zero-Free    Adding multiple  configurations for system clock frequency
  */
 
 #include <board.h>
 
 void SystemClock_Config(void)
 {
-  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
-  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
-  RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
+    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
+    RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
 
 #ifdef BSP_USING_ONCHIP_RTC
-  /**Configure LSE Drive Capability 
-  */
-  HAL_PWR_EnableBkUpAccess();
-  __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
-#endif  
-  /**Initializes the CPU, AHB and APB busses clocks 
-  */
-  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
-  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
-  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
-  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
-  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
-  RCC_OscInitStruct.PLL.PLLM = 1;
-  RCC_OscInitStruct.PLL.PLLN = 10;
-  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
-  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
-  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
-  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
-  {
-    Error_Handler();
-  }
-  /**Initializes the CPU, AHB and APB busses clocks 
-  */
-  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
-                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
-  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
-  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
-  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
-  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+    /**Configure LSE Drive Capability
+    */
+    HAL_PWR_EnableBkUpAccess();
+    __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
+#endif
+    /**Initializes the CPU, AHB and APB busses clocks
+    */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
+    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
+    RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
+    RCC_OscInitStruct.PLL.PLLM = 1;
+    RCC_OscInitStruct.PLL.PLLN = 10;
+    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
+    RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
+    RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
+    {
+        Error_Handler();
+    }
+    /**Initializes the CPU, AHB and APB busses clocks
+    */
+    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
+                                  | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
+    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
+    {
+        Error_Handler();
+    }
+    PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2;
+    PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
+    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
+    {
+        Error_Handler();
+    }
+    /**Configure the main internal regulator output voltage
+    */
+    if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
+    {
+        Error_Handler();
+    }
+}
+
+#ifdef RT_USING_PM
+
+void SystemClock_MSI_ON(void)
+{
+    RCC_OscInitTypeDef RCC_OscInitStruct   = {0};
+    RCC_ClkInitTypeDef RCC_ClkInitStruct   = {0};
+
+    /* Initializes the CPU, AHB and APB busses clocks */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
+    RCC_OscInitStruct.MSIState = RCC_MSI_ON;
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
+    {
+        RT_ASSERT(0);
+    }
+
+    RCC_ClkInitStruct.ClockType       = RCC_CLOCKTYPE_SYSCLK;
+    RCC_ClkInitStruct.SYSCLKSource    = RCC_SYSCLKSOURCE_MSI;
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
+    {
+        Error_Handler();
+    }
+}
+
+void SystemClock_MSI_OFF(void)
+{
+    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+
+    RCC_OscInitStruct.OscillatorType  = RCC_OSCILLATORTYPE_MSI;
+    RCC_OscInitStruct.HSIState        = RCC_MSI_OFF;
+    RCC_OscInitStruct.PLL.PLLState    = RCC_PLL_NONE;  /* No update on PLL */
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
+    {
+        Error_Handler();
+    }
+}
+
+void SystemClock_80M(void)
+{
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+    RCC_ClkInitTypeDef RCC_ClkInitStruct;
 
-  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
-  {
-    Error_Handler();
-  }
-  PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2;
-  PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
-  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
-  {
-    Error_Handler();
-  }
-  /**Configure the main internal regulator output voltage 
+    /**Initializes the CPU, AHB and APB busses clocks */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
+    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
+    RCC_OscInitStruct.HSICalibrationValue = 16;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
+    RCC_OscInitStruct.PLL.PLLM = 1;
+    RCC_OscInitStruct.PLL.PLLN = 10;
+    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
+    RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
+    RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
+    {
+        Error_Handler();
+    }
+
+    /**Initializes the CPU, AHB and APB busses clocks
+    */
+    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
+                                  | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
+    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
+    {
+        Error_Handler();
+    }
+}
+
+void SystemClock_24M(void)
+{
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+    RCC_ClkInitTypeDef RCC_ClkInitStruct;
+    RCC_PeriphCLKInitTypeDef PeriphClkInit;
+
+    /** Initializes the CPU, AHB and APB busses clocks */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
+    RCC_OscInitStruct.HSIState = RCC_HSI_ON;
+    RCC_OscInitStruct.HSICalibrationValue = 16;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
+    RCC_OscInitStruct.PLL.PLLM = 1;
+    RCC_OscInitStruct.PLL.PLLN = 12;
+    RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
+    RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
+    RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV8;
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
+    {
+        Error_Handler();
+    }
+    /** Initializes the CPU, AHB and APB busses clocks */
+    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_SYSCLK
+                                  | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2;
+    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
+    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
+    {
+        Error_Handler();
+    }
+    PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART2;
+    PeriphClkInit.Usart2ClockSelection = RCC_USART2CLKSOURCE_PCLK1;
+    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
+    {
+        Error_Handler();
+    }
+}
+
+void SystemClock_2M(void)
+{
+    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
+    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+
+    /* MSI is enabled after System reset, update MSI to 2Mhz (RCC_MSIRANGE_5) */
+    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
+    RCC_OscInitStruct.MSIState = RCC_MSI_ON;
+    RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_5;
+    RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
+    RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
+    {
+        /* Initialization Error */
+        Error_Handler();
+    }
+
+    /* Select MSI as system clock source and configure the HCLK, PCLK1 and PCLK2
+       clocks dividers */
+    RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
+    RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
+    RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
+    {
+        /* Initialization Error */
+        Error_Handler();
+    }
+}
+
+/**
+  * @brief  Configures system clock after wake-up from STOP: enable HSI, PLL
+  *         and select PLL as system clock source.
+  * @param  None
+  * @retval None
   */
-  if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
-  {
-    Error_Handler();
-  }
+void SystemClock_ReConfig(uint8_t mode)
+{
+    SystemClock_MSI_ON();
+
+    switch (mode)
+    {
+    case PM_RUN_MODE_HIGH_SPEED:
+    case PM_RUN_MODE_NORMAL_SPEED:
+        SystemClock_80M();
+        break;
+    case PM_RUN_MODE_MEDIUM_SPEED:
+        SystemClock_24M();
+        break;
+    case PM_RUN_MODE_LOW_SPEED:
+        SystemClock_2M();
+        break;
+    default:
+        break;
+    }
+
+    // SystemClock_MSI_OFF();
 }
+
+#endif
diff --git a/bsp/stm32/stm32l476-st-nucleo/board/board.h b/bsp/stm32/stm32l476-st-nucleo/board/board.h
index f5e2db4e1b..b59fe1b3b6 100644
--- a/bsp/stm32/stm32l476-st-nucleo/board/board.h
+++ b/bsp/stm32/stm32l476-st-nucleo/board/board.h
@@ -33,6 +33,17 @@ extern "C" {
 
 void SystemClock_Config(void);
 
+#ifdef RT_USING_PM
+
+void SystemClock_MSI_ON(void);
+void SystemClock_MSI_OFF(void);
+void SystemClock_80M(void);
+void SystemClock_24M(void);
+void SystemClock_2M(void);
+void SystemClock_ReConfig(uint8_t mode);
+
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/bsp/stm32/stm32l476-st-nucleo/project.uvprojx b/bsp/stm32/stm32l476-st-nucleo/project.uvprojx
index c4775ff651..bd3252b612 100644
--- a/bsp/stm32/stm32l476-st-nucleo/project.uvprojx
+++ b/bsp/stm32/stm32l476-st-nucleo/project.uvprojx
@@ -369,7 +369,7 @@
             <ScatterFile>.\board\linker_scripts\link.sct</ScatterFile>
             <IncludeLibs />
             <IncludeLibsPath />
-            <Misc> --keep *.o(.rti_fn.*)   --keep *.o(FSymTab)</Misc>
+            <Misc />
             <LinkerInputFile />
             <DisabledWarnings />
           </LDads>
@@ -533,9 +533,16 @@
           </Files>
           <Files>
             <File>
-              <FileName>drv_soft_i2c.c</FileName>
+              <FileName>drv_pm.c</FileName>
               <FileType>1</FileType>
-              <FilePath>..\libraries\HAL_Drivers\drv_soft_i2c.c</FilePath>
+              <FilePath>..\libraries\HAL_Drivers\drv_pm.c</FilePath>
+            </File>
+          </Files>
+          <Files>
+            <File>
+              <FileName>drv_lptim.c</FileName>
+              <FileType>1</FileType>
+              <FilePath>..\libraries\HAL_Drivers\drv_lptim.c</FilePath>
             </File>
           </Files>
           <Files>
@@ -588,30 +595,16 @@
           <GroupName>DeviceDrivers</GroupName>
           <Files>
             <File>
-              <FileName>i2c_core.c</FileName>
-              <FileType>1</FileType>
-              <FilePath>..\..\..\components\drivers\i2c\i2c_core.c</FilePath>
-            </File>
-          </Files>
-          <Files>
-            <File>
-              <FileName>i2c_dev.c</FileName>
-              <FileType>1</FileType>
-              <FilePath>..\..\..\components\drivers\i2c\i2c_dev.c</FilePath>
-            </File>
-          </Files>
-          <Files>
-            <File>
-              <FileName>i2c-bit-ops.c</FileName>
+              <FileName>pin.c</FileName>
               <FileType>1</FileType>
-              <FilePath>..\..\..\components\drivers\i2c\i2c-bit-ops.c</FilePath>
+              <FilePath>..\..\..\components\drivers\misc\pin.c</FilePath>
             </File>
           </Files>
           <Files>
             <File>
-              <FileName>pin.c</FileName>
+              <FileName>pm.c</FileName>
               <FileType>1</FileType>
-              <FilePath>..\..\..\components\drivers\misc\pin.c</FilePath>
+              <FilePath>..\..\..\components\drivers\pm\pm.c</FilePath>
             </File>
           </Files>
           <Files>
@@ -877,13 +870,6 @@
           </Files>
           <Files>
             <File>
-              <FileName>stm32l4xx_hal_sram.c</FileName>
-              <FileType>1</FileType>
-              <FilePath>..\libraries\STM32L4xx_HAL\STM32L4xx_HAL_Driver\Src\stm32l4xx_hal_sram.c</FilePath>
-            </File>
-          </Files>
-          <Files>
-            <File>
               <FileName>stm32l4xx_hal_gpio.c</FileName>
               <FileType>1</FileType>
               <FilePath>..\libraries\STM32L4xx_HAL\STM32L4xx_HAL_Driver\Src\stm32l4xx_hal_gpio.c</FilePath>
@@ -919,30 +905,23 @@
           </Files>
           <Files>
             <File>
-              <FileName>stm32l4xx_hal_i2c.c</FileName>
-              <FileType>1</FileType>
-              <FilePath>..\libraries\STM32L4xx_HAL\STM32L4xx_HAL_Driver\Src\stm32l4xx_hal_i2c.c</FilePath>
-            </File>
-          </Files>
-          <Files>
-            <File>
-              <FileName>stm32l4xx_hal_i2c_ex.c</FileName>
+              <FileName>stm32l4xx_hal_rtc.c</FileName>
               <FileType>1</FileType>
-              <FilePath>..\libraries\STM32L4xx_HAL\STM32L4xx_HAL_Driver\Src\stm32l4xx_hal_i2c_ex.c</FilePath>
+              <FilePath>..\libraries\STM32L4xx_HAL\STM32L4xx_HAL_Driver\Src\stm32l4xx_hal_rtc.c</FilePath>
             </File>
           </Files>
           <Files>
             <File>
-              <FileName>stm32l4xx_hal_rtc.c</FileName>
+              <FileName>stm32l4xx_hal_rtc_ex.c</FileName>
               <FileType>1</FileType>
-              <FilePath>..\libraries\STM32L4xx_HAL\STM32L4xx_HAL_Driver\Src\stm32l4xx_hal_rtc.c</FilePath>
+              <FilePath>..\libraries\STM32L4xx_HAL\STM32L4xx_HAL_Driver\Src\stm32l4xx_hal_rtc_ex.c</FilePath>
             </File>
           </Files>
           <Files>
             <File>
-              <FileName>stm32l4xx_hal_rtc_ex.c</FileName>
+              <FileName>stm32l4xx_hal_lptim.c</FileName>
               <FileType>1</FileType>
-              <FilePath>..\libraries\STM32L4xx_HAL\STM32L4xx_HAL_Driver\Src\stm32l4xx_hal_rtc_ex.c</FilePath>
+              <FilePath>..\libraries\STM32L4xx_HAL\STM32L4xx_HAL_Driver\Src\stm32l4xx_hal_lptim.c</FilePath>
             </File>
           </Files>
         </Group>
diff --git a/bsp/stm32/stm32l476-st-nucleo/rtconfig.h b/bsp/stm32/stm32l476-st-nucleo/rtconfig.h
index afeaf369c0..380c3c3280 100644
--- a/bsp/stm32/stm32l476-st-nucleo/rtconfig.h
+++ b/bsp/stm32/stm32l476-st-nucleo/rtconfig.h
@@ -15,7 +15,7 @@
 #define RT_USING_HOOK
 #define RT_USING_IDLE_HOOK
 #define RT_IDEL_HOOK_LIST_SIZE 4
-#define IDLE_THREAD_STACK_SIZE 256
+#define IDLE_THREAD_STACK_SIZE 1024
 #define RT_DEBUG
 #define RT_DEBUG_COLOR
 
@@ -79,7 +79,10 @@
 #define RT_PIPE_BUFSZ 512
 #define RT_USING_SERIAL
 #define RT_SERIAL_USING_DMA
+#define RT_SERIAL_RB_BUFSZ 64
 #define RT_USING_PIN
+#define RT_USING_PM
+#define RT_USING_RTC
 
 /* Using WiFi */
 
@@ -96,6 +99,9 @@
 /* Socket abstraction layer */
 
 
+/* Network interface device */
+
+
 /* light weight TCP/IP stack */
 
 
@@ -111,9 +117,6 @@
 /* Utilities */
 
 
-/* ARM CMSIS */
-
-
 /* RT-Thread online packages */
 
 /* IoT - internet of things */
@@ -151,13 +154,8 @@
 /* miscellaneous packages */
 
 
-/* sample package */
-
 /* samples: kernel and components samples */
 
-
-/* example package: hello */
-
 #define SOC_FAMILY_STM32
 #define SOC_SERIES_STM32L4
 
diff --git a/components/drivers/include/drivers/pm.h b/components/drivers/include/drivers/pm.h
index 94d4c8559b..e35b21cd48 100644
--- a/components/drivers/include/drivers/pm.h
+++ b/components/drivers/include/drivers/pm.h
@@ -7,6 +7,7 @@
  * Date           Author       Notes
  * 2012-06-02     Bernard      the first version
  * 2018-08-02     Tanek        split run and sleep modes, support custom mode
+ * 2019-04-28     Zero-Free    improve PM mode and device ops interface
  */
 
 #ifndef __PM_H__
@@ -16,96 +17,67 @@
 
 #ifndef PM_HAS_CUSTOM_CONFIG
 
-/* All modes used for rt_pm_request() adn rt_pm_release() */
+/* All modes used for rt_pm_request() and rt_pm_release() */
 enum
 {
-    /* run modes */
-    PM_RUN_MODE_NORMAL = 0,
-
     /* sleep modes */
-    PM_SLEEP_MODE_SLEEP,
-    PM_SLEEP_MODE_TIMER,
+    PM_SLEEP_MODE_NONE = 0,
+    PM_SLEEP_MODE_IDLE,
+    PM_SLEEP_MODE_LIGHT,
+    PM_SLEEP_MODE_DEEP,
+    PM_SLEEP_MODE_STANDBY,
     PM_SLEEP_MODE_SHUTDOWN,
+    PM_SLEEP_MODE_MAX,
+};
+
+enum
+{
+    /* run modes*/
+    PM_RUN_MODE_HIGH_SPEED = 0,
+    PM_RUN_MODE_NORMAL_SPEED,
+    PM_RUN_MODE_MEDIUM_SPEED,
+    PM_RUN_MODE_LOW_SPEED,
+    PM_RUN_MODE_MAX,
+};
+
+enum
+{
+    RT_PM_FREQUENCY_PENDING = 0x01,
 };
 
+#define RT_PM_DEFAULT_SLEEP_MODE PM_SLEEP_MODE_IDLE
+#define RT_PM_DEFAULT_RUN_MODE   PM_RUN_MODE_NORMAL_SPEED
+
 /* The name of all modes used in the msh command "pm_dump" */
-#define PM_MODE_NAMES           \
+#define PM_SLEEP_MODE_NAMES     \
 {                               \
-    "Running Mode",             \
-                                \
-    "Sleep Mode",               \
-    "Timer Mode",               \
+    "None Mode",                \
+    "Idle Mode",                \
+    "LightSleep Mode",          \
+    "DeepSleep Mode",           \
+    "Standby Mode",             \
     "Shutdown Mode",            \
 }
 
-/* run mode count : 1 */
-#define PM_RUN_MODE_COUNT       1
-/* sleep mode count : 3 */
-#define PM_SLEEP_MODE_COUNT     3
-
-/* support redefining default run mode */
-#ifndef PM_RUN_MODE_DEFAULT
-#define PM_RUN_MODE_DEFAULT     0
-#endif
-
-/* support redefining default sleep mode */
-#ifndef PM_SLEEP_MODE_DEFAULT
-#define PM_SLEEP_MODE_DEFAULT   (PM_SLEEP_MODE_START)
-#endif
-
-/* support redefining the minimum tick into sleep mode */
-#ifndef PM_MIN_ENTER_SLEEP_TICK
-#define PM_MIN_ENTER_SLEEP_TICK   (1)
-#endif
+#define PM_RUN_MODE_NAMES       \
+{                               \
+    "High Speed",               \
+    "Normal Speed",             \
+    "Medium Speed",             \
+    "Low Mode",                 \
+}
 
 #else /* PM_HAS_CUSTOM_CONFIG */
 
 #include <pm_cfg.h>
 
-#ifndef PM_RUN_MODE_COUNT
-#error  "You must defined PM_RUN_MODE_COUNT on pm_cfg.h"
-#endif
-
-#ifndef PM_SLEEP_MODE_COUNT
-#error  "You must defined PM_SLEEP_MODE_COUNT on pm_cfg.h"
-#endif
-
-#ifndef PM_MODE_DEFAULT
-#error  "You must defined PM_MODE_DEFAULT on pm_cfg.h"
-#endif
-
-#ifndef PM_MODE_NAMES
-#error  "You must defined PM_MODE_NAMES on pm_cfg.h"
-#endif
-
-#ifndef PM_RUN_MODE_DEFAULT
-#error  "You must defined PM_RUN_MODE_DEFAULT on pm_cfg.h"
-#endif
-
-/* The default sleep mode(PM_SLEEP_MODE_DEFAULT) are not required.
- * If the default mode is defined, it is requested once in rt_system_pm_init()
- */
-
 #endif /* PM_HAS_CUSTOM_CONFIG */
 
-/* run mode must start at 0 */
-#define PM_RUN_MODE_START       0
-/* the values of the run modes and sleep mode must be consecutive */
-#define PM_SLEEP_MODE_START     PM_RUN_MODE_COUNT
-/* all mode count */
-#define PM_MODE_COUNT           (PM_RUN_MODE_COUNT + PM_SLEEP_MODE_COUNT)
-/* The last mode, will be request in rt_system_pm_init() */
-#define PM_MODE_MAX             (PM_RUN_MODE_COUNT + PM_SLEEP_MODE_COUNT - 1)
-
-#if PM_MODE_COUNT > 32
-#error "The number of modes cannot exceed 32"
-#endif
-
 /**
  * device control flag to request or release power
  */
 #define RT_PM_DEVICE_CTRL_REQUEST   0x01
-#define RT_PM_DEVICE_CTRL_RELEASE   0x02
+#define RT_PM_DEVICE_CTRL_RELEASE   0x00
 
 struct rt_pm;
 
@@ -114,13 +86,8 @@ struct rt_pm;
  */
 struct rt_pm_ops
 {
-    void (*enter)(struct rt_pm *pm);
-    void (*exit)(struct rt_pm *pm);
-
-#if PM_RUN_MODE_COUNT > 1
-    void (*frequency_change)(struct rt_pm *pm, rt_uint32_t frequency);
-#endif
-
+    void (*sleep)(struct rt_pm *pm, uint8_t mode);
+    void (*run)(struct rt_pm *pm, uint8_t mode);
     void (*timer_start)(struct rt_pm *pm, rt_uint32_t timeout);
     void (*timer_stop)(struct rt_pm *pm);
     rt_tick_t (*timer_get_tick)(struct rt_pm *pm);
@@ -128,18 +95,15 @@ struct rt_pm_ops
 
 struct rt_device_pm_ops
 {
-#if PM_RUN_MODE_COUNT > 1
-    void (*frequency_change)(const struct rt_device* device);
-#endif
-
-    void (*suspend)(const struct rt_device* device);
-    void (*resume) (const struct rt_device* device);
+    int (*suspend)(const struct rt_device *device, uint8_t mode);
+    void (*resume)(const struct rt_device *device, uint8_t mode);
+    int (*frequency_change)(const struct rt_device *device, uint8_t mode);
 };
 
 struct rt_device_pm
 {
-    const struct rt_device* device;
-    const struct rt_device_pm_ops* ops;
+    const struct rt_device *device;
+    const struct rt_device_pm_ops *ops;
 };
 
 /**
@@ -150,32 +114,45 @@ struct rt_pm
     struct rt_device parent;
 
     /* modes */
-    rt_uint8_t modes[PM_MODE_COUNT];
-    rt_uint8_t current_mode;    /* current pm mode */
-    rt_uint8_t exit_count;
+    rt_uint8_t modes[PM_SLEEP_MODE_MAX];
+    rt_uint8_t sleep_mode;    /* current sleep mode */
+    rt_uint8_t run_mode;      /* current running mode */
 
     /* the list of device, which has PM feature */
     rt_uint8_t device_pm_number;
-    struct rt_device_pm* device_pm;
-    struct rt_semaphore  device_lock;
+    struct rt_device_pm *device_pm;
 
     /* if the mode has timer, the corresponding bit is 1*/
-    rt_uint32_t timer_mask;
+    rt_uint8_t timer_mask;
+    rt_uint8_t flags;
 
     const struct rt_pm_ops *ops;
 };
 
-void rt_pm_enter(void);
-void rt_pm_exit(void);
+enum
+{
+    RT_PM_ENTER_SLEEP = 0,
+    RT_PM_EXIT_SLEEP,
+};
+
+struct rt_pm_notify
+{
+    void (*notify)(uint8_t event, uint8_t mode, void *data);
+    void *data;
+};
+
+void rt_pm_request(uint8_t sleep_mode);
+void rt_pm_release(uint8_t sleep_mode);
+int rt_pm_run_enter(uint8_t run_mode);
 
-void rt_pm_request(rt_ubase_t mode);
-void rt_pm_release(rt_ubase_t mode);
+void rt_pm_device_register(struct rt_device *device, const struct rt_device_pm_ops *ops);
+void rt_pm_device_unregister(struct rt_device *device);
 
-void rt_pm_register_device(struct rt_device* device, const struct rt_device_pm_ops* ops);
-void rt_pm_unregister_device(struct rt_device* device);
+void rt_pm_notify_set(void (*notify)(uint8_t event, uint8_t mode, void *data), void *data);
+void rt_pm_default_set(uint8_t sleep_mode);
 
 void rt_system_pm_init(const struct rt_pm_ops *ops,
-                       rt_uint8_t              timer_mask,
-                       void                   *user_data);
+                       uint8_t              timer_mask,
+                       void                 *user_data);
 
 #endif /* __PM_H__ */
diff --git a/components/drivers/pm/pm.c b/components/drivers/pm/pm.c
index c300414444..98a993b526 100644
--- a/components/drivers/pm/pm.c
+++ b/components/drivers/pm/pm.c
@@ -7,6 +7,7 @@
  * Date           Author       Notes
  * 2012-06-02     Bernard      the first version
  * 2018-08-02     Tanek        split run and sleep modes, support custom mode
+ * 2019-04-28     Zero-Free    improve PM mode and device ops interface
  */
 
 #include <rthw.h>
@@ -16,27 +17,45 @@
 #ifdef RT_USING_PM
 
 static struct rt_pm _pm;
+static uint8_t _pm_default_sleep = RT_PM_DEFAULT_SLEEP_MODE;
+static struct rt_pm_notify _pm_notify;
+
+#define RT_PM_TICKLESS_THRESH (2)
+
+RT_WEAK uint32_t rt_pm_enter_critical(uint8_t sleep_mode)
+{
+    return rt_hw_interrupt_disable();
+}
+
+RT_WEAK void rt_pm_exit_critical(uint32_t ctx, uint8_t sleep_mode)
+{
+    rt_hw_interrupt_enable(ctx);
+}
 
 /**
  * This function will suspend all registered devices
  */
-static void _pm_device_suspend(void)
+static int _pm_device_suspend(uint8_t mode)
 {
-    int index;
+    int index, ret = RT_EOK;
 
     for (index = 0; index < _pm.device_pm_number; index++)
     {
         if (_pm.device_pm[index].ops->suspend != RT_NULL)
         {
-            _pm.device_pm[index].ops->suspend(_pm.device_pm[index].device);
+            ret = _pm.device_pm[index].ops->suspend(_pm.device_pm[index].device, mode);
+            if(ret != RT_EOK)
+                break; 
         }
     }
+
+    return ret;
 }
 
 /**
  * This function will resume all registered devices
  */
-static void _pm_device_resume(void)
+static void _pm_device_resume(uint8_t mode)
 {
     int index;
 
@@ -44,16 +63,15 @@ static void _pm_device_resume(void)
     {
         if (_pm.device_pm[index].ops->resume != RT_NULL)
         {
-            _pm.device_pm[index].ops->resume(_pm.device_pm[index].device);
+            _pm.device_pm[index].ops->resume(_pm.device_pm[index].device, mode);
         }
     }
 }
 
-#if PM_RUN_MODE_COUNT > 1
 /**
  * This function will update the frequency of all registered devices
  */
-static void _pm_device_frequency_change(void)
+static void _pm_device_frequency_change(uint8_t mode)
 {
     rt_uint32_t index;
 
@@ -61,152 +79,148 @@ static void _pm_device_frequency_change(void)
     for (index = 0; index < _pm.device_pm_number; index ++)
     {
         if (_pm.device_pm[index].ops->frequency_change != RT_NULL)
-            _pm.device_pm[index].ops->frequency_change(_pm.device_pm[index].device);
+            _pm.device_pm[index].ops->frequency_change(_pm.device_pm[index].device, mode);
     }
 }
-#endif
 
 /**
- * This function will enter corresponding power mode.
+ * This function will update the system clock frequency when idle
  */
-void rt_pm_enter(void)
+static void _pm_frequency_scaling(struct rt_pm *pm)
 {
-    rt_ubase_t level;
-    struct rt_pm *pm;
-    rt_uint32_t index;
-    rt_tick_t timeout_tick;
-
-    pm = &_pm;
+    rt_base_t level;
 
-    /* disable interrupt before check run modes */
-    level = rt_hw_interrupt_disable();
-    /* check each run mode, and decide to swithc to run mode or sleep mode */
-    for (index = 0; index < PM_RUN_MODE_COUNT; index++)
+    if (pm->flags & RT_PM_FREQUENCY_PENDING)
     {
-        if (pm->modes[index])
-        {
-            if (index > pm->current_mode)
-            {
-                pm->ops->exit(pm);
-                pm->current_mode = index;
-                pm->ops->enter(pm);
-#if PM_RUN_MODE_COUNT > 1
-                pm->ops->frequency_change(pm, 0);
-                _pm_device_frequency_change();
-#endif
-            }
-
-            rt_hw_interrupt_enable(level);
-            /* The current mode is run mode, no need to check sleep mode */
-            return ;
-        }
+        level = rt_hw_interrupt_disable();
+        /* change system runing mode */
+        pm->ops->run(pm, pm->run_mode);
+        /* changer device frequency */
+        _pm_device_frequency_change(pm->run_mode);
+        pm->flags &= ~RT_PM_FREQUENCY_PENDING;
+        rt_hw_interrupt_enable(level);
     }
-    /* enable interrupt after check run modes */
-    rt_hw_interrupt_enable(level);
+}
 
-    level = rt_hw_interrupt_disable();
-    /* check each sleep mode to decide which mode can system sleep. */
-    for (index = PM_SLEEP_MODE_START; index < PM_SLEEP_MODE_START + PM_SLEEP_MODE_COUNT; index++)
+/**
+ * This function selects the sleep mode according to the rt_pm_request/rt_pm_release count.
+ */
+static uint8_t _pm_select_sleep_mode(struct rt_pm *pm)
+{
+    int index;
+    uint8_t mode;
+
+    mode = _pm_default_sleep;
+    for (index = PM_SLEEP_MODE_NONE; index < PM_SLEEP_MODE_MAX; index ++)
     {
         if (pm->modes[index])
         {
-            /* let mcu sleep when system is idle */
-
-            /* run mode to sleep mode */
-            if (pm->current_mode < PM_SLEEP_MODE_START)
-            {
-                /* exit run mode */
-                pm->ops->exit(pm);
-            }
-
-            /* set current power mode */
-            pm->current_mode = index;
-            pm->exit_count = 1;
-
-            /* suspend all of devices with PM feature */
-            _pm_device_suspend();
-
-            /* should start pm timer */
-            if (pm->timer_mask & (1 << index))
-            {
-                /* get next os tick */
-                timeout_tick = rt_timer_next_timeout_tick();
-                if (timeout_tick != RT_TICK_MAX)
-                {
-                    timeout_tick -= rt_tick_get();
-
-#if defined(PM_MIN_ENTER_SLEEP_TICK) && PM_MIN_ENTER_SLEEP_TICK > 0
-                    if (timeout_tick < PM_MIN_ENTER_SLEEP_TICK)
-                    {
-                        rt_hw_interrupt_enable(level);
-                        /* limit the minimum time to enter timer sleep mode */
-                        return ;
-                    }
-#endif
-                }
-                /* startup pm timer */
-                pm->ops->timer_start(pm, timeout_tick);
-            }
-
-            /* enter sleep and wait to be waken up */
-            pm->ops->enter(pm);
-
-            /* exit from low power mode */
-            rt_pm_exit();
-
-            rt_hw_interrupt_enable(level);
-            return ;
+            mode = index;
+            break;
         }
     }
+    pm->sleep_mode = mode;
 
-    rt_hw_interrupt_enable(level);
+    return mode;
 }
 
 /**
- * This function exits from sleep mode.
+ * This function changes the power sleep mode base on the result of selection
  */
-void rt_pm_exit(void)
+static void _pm_change_sleep_mode(struct rt_pm *pm, uint8_t mode)
 {
-    rt_ubase_t level;
-    struct rt_pm *pm;
-    rt_tick_t delta_tick;
+    rt_tick_t timeout_tick, delta_tick;
+    rt_base_t level;
+    int ret = RT_EOK;
 
-    pm = &_pm;
-
-    level = rt_hw_interrupt_disable();
-
-    if (pm->exit_count)
+    if (mode == PM_SLEEP_MODE_NONE)
+    {
+        pm->sleep_mode = mode;
+        pm->ops->sleep(pm, PM_SLEEP_MODE_NONE);
+    }
+    else
     {
-        pm->exit_count = 0;
+        level = rt_pm_enter_critical(mode);
+
+        /* Notify app will enter sleep mode */
+        if (_pm_notify.notify)
+            _pm_notify.notify(RT_PM_ENTER_SLEEP, mode, _pm_notify.data);
 
-        if (pm->current_mode >= PM_SLEEP_MODE_START)
+        /* Suspend all peripheral device */
+        ret = _pm_device_suspend(mode);
+        if (ret != RT_EOK)
         {
-            /* sleep mode with timer */
-            if (pm->timer_mask & (1 << pm->current_mode))
-            {
-                /* get the tick of pm timer */
-                delta_tick = pm->ops->timer_get_tick(pm);
+            _pm_device_resume(mode);
+            if (_pm_notify.notify)
+                _pm_notify.notify(RT_PM_EXIT_SLEEP, mode, _pm_notify.data);
+            rt_pm_exit_critical(level, mode);
 
-                /* stop pm timer */
-                pm->ops->timer_stop(pm);
+            return;
+        }
 
-                if (delta_tick)
+        /* Tickless*/
+        if (pm->timer_mask & (0x01 << mode))
+        {
+            timeout_tick = rt_timer_next_timeout_tick();
+            if (timeout_tick == RT_TICK_MAX)
+            {
+                if (pm->ops->timer_start)
+                {
+                    pm->ops->timer_start(pm, RT_TICK_MAX);
+                }
+            }
+            else
+            {
+                timeout_tick = timeout_tick - rt_tick_get();
+                if (timeout_tick < RT_PM_TICKLESS_THRESH)
+                {
+                    mode = PM_SLEEP_MODE_IDLE;
+                }
+                else
                 {
-                    /* adjust OS tick */
-                    rt_tick_set(rt_tick_get() + delta_tick);
-                    /* check system timer */
-                    rt_timer_check();
+                    pm->ops->timer_start(pm, timeout_tick);
                 }
             }
+        }
+
+        /* enter lower power state */
+        pm->ops->sleep(pm, mode);
 
-            /* exit from sleep mode */
-            pm->ops->exit(pm);
-            /* resume the device with PM feature */
-            _pm_device_resume();
+        /* wake up from lower power state*/
+        if (pm->timer_mask & (0x01 << mode))
+        {
+            delta_tick = pm->ops->timer_get_tick(pm);
+            pm->ops->timer_stop(pm);
+            if (delta_tick)
+            {
+                rt_tick_set(rt_tick_get() + delta_tick);
+                rt_timer_check();
+            }
         }
+
+        /* resume all device */
+        _pm_device_resume(pm->sleep_mode);
+
+        if (_pm_notify.notify)
+            _pm_notify.notify(RT_PM_EXIT_SLEEP, mode, _pm_notify.data);
+
+        rt_pm_exit_critical(level, mode);
     }
+}
 
-    rt_hw_interrupt_enable(level);
+/**
+ * This function will enter corresponding power mode.
+ */
+void rt_system_power_manager(void)
+{
+    uint8_t mode;
+
+    /* CPU frequency scaling according to the runing mode settings */
+    _pm_frequency_scaling(&_pm);
+
+    /* Low Power Mode Processing */
+    mode = _pm_select_sleep_mode(&_pm);
+    _pm_change_sleep_mode(&_pm, mode);
 }
 
 /**
@@ -215,60 +229,18 @@ void rt_pm_exit(void)
  *
  * @param parameter the parameter of run mode or sleep mode
  */
-void rt_pm_request(rt_ubase_t mode)
+void rt_pm_request(uint8_t mode)
 {
-    rt_ubase_t level;
+    rt_base_t level;
     struct rt_pm *pm;
 
-    pm = &_pm;
-
-    if (mode > PM_MODE_MAX)
+    if (mode > (PM_SLEEP_MODE_MAX - 1))
         return;
 
     level = rt_hw_interrupt_disable();
-
-    /* update pm modes table */
-    pm->modes[mode] ++;
-
-    /* request higter mode with a smaller mode value*/
-    if (mode < pm->current_mode)
-    {
-        /* the old current mode is RUN mode, need to all pm->ops->exit(),
-         * if not, it has already called in rt_pm_exit()
-         */
-        if (pm->current_mode < PM_SLEEP_MODE_START)
-        {
-            pm->ops->exit(pm);
-        }
-        else if (pm->exit_count)
-        {
-            /* call exeit when global interrupt is disable */
-            pm->ops->exit(pm);
-            pm->exit_count = 0;
-        }
-
-        /* update current mode */
-        pm->current_mode = mode;
-
-        /* current mode is higher run mode */
-        if (mode < PM_SLEEP_MODE_START)
-        {
-            /* enter run mode */
-            pm->ops->enter(pm);
-#if PM_RUN_MODE_COUNT > 1
-            /* frequency change */
-            pm->ops->frequency_change(pm, 0);
-            _pm_device_frequency_change();
-#endif
-        }
-        else
-        {
-            /* do nothing when request higher sleep mode,
-             * and swithc to new sleep mode in rt_pm_enter()
-             */
-        }
-    }
-
+    pm = &_pm;
+    if (pm->modes[mode] < 255)
+        pm->modes[mode] ++;
     rt_hw_interrupt_enable(level);
 }
 
@@ -279,21 +251,18 @@ void rt_pm_request(rt_ubase_t mode)
  * @param parameter the parameter of run mode or sleep mode
  *
  */
-void rt_pm_release(rt_ubase_t mode)
+void rt_pm_release(uint8_t mode)
 {
     rt_ubase_t level;
     struct rt_pm *pm;
 
-    pm = &_pm;
-
-    if (mode > PM_MODE_MAX)
+    if (mode > (PM_SLEEP_MODE_MAX - 1))
         return;
 
     level = rt_hw_interrupt_disable();
-
+    pm = &_pm;
     if (pm->modes[mode] > 0)
         pm->modes[mode] --;
-
     rt_hw_interrupt_enable(level);
 }
 
@@ -303,9 +272,9 @@ void rt_pm_release(rt_ubase_t mode)
  * @param device the device with PM feature
  * @param ops the PM ops for device
  */
-void rt_pm_register_device(struct rt_device *device, const struct rt_device_pm_ops *ops)
+void rt_pm_device_register(struct rt_device *device, const struct rt_device_pm_ops *ops)
 {
-    rt_ubase_t level;
+    rt_base_t level;
     struct rt_device_pm *device_pm;
 
     RT_DEBUG_NOT_IN_INTERRUPT;
@@ -322,8 +291,6 @@ void rt_pm_register_device(struct rt_device *device, const struct rt_device_pm_o
         _pm.device_pm_number += 1;
     }
 
-    rt_sem_release(&(_pm.device_lock));
-
     rt_hw_interrupt_enable(level);
 }
 
@@ -332,7 +299,7 @@ void rt_pm_register_device(struct rt_device *device, const struct rt_device_pm_o
  *
  * @param device the device with PM feature
  */
-void rt_pm_unregister_device(struct rt_device *device)
+void rt_pm_device_unregister(struct rt_device *device)
 {
     rt_ubase_t level;
     rt_uint32_t index;
@@ -363,6 +330,23 @@ void rt_pm_unregister_device(struct rt_device *device)
 }
 
 /**
+ * This function set notification callback for application
+ */
+void rt_pm_notify_set(void (*notify)(uint8_t event, uint8_t mode, void *data), void *data)
+{
+    _pm_notify.notify = notify;
+    _pm_notify.data = data;
+}
+
+/**
+ * This function set default sleep mode when no pm_request
+ */
+void rt_pm_default_set(uint8_t sleep_mode)
+{
+    _pm_default_sleep = sleep_mode;
+}
+
+/**
  * RT-Thread device interface for PM device
  */
 static rt_size_t _rt_pm_device_read(rt_device_t dev,
@@ -377,7 +361,7 @@ static rt_size_t _rt_pm_device_read(rt_device_t dev,
     pm = (struct rt_pm *)dev;
     RT_ASSERT(pm != RT_NULL);
 
-    if (pos <= PM_MODE_MAX)
+    if (pos < PM_SLEEP_MODE_MAX)
     {
         int mode;
 
@@ -399,11 +383,11 @@ static rt_size_t _rt_pm_device_write(rt_device_t dev,
     {
         /* get request */
         request = *(unsigned char *)buffer;
-        if (request == '1')
+        if (request ==  0x01)
         {
             rt_pm_request(pos);
         }
-        else if (request == '0')
+        else if (request == 0x00)
         {
             rt_pm_release(pos);
         }
@@ -434,6 +418,33 @@ static rt_err_t _rt_pm_device_control(rt_device_t dev,
     return RT_EOK;
 }
 
+int rt_pm_run_enter(uint8_t mode)
+{
+    rt_base_t level;
+    struct rt_pm *pm;
+
+    if (mode > PM_RUN_MODE_MAX)
+        return -RT_EINVAL;
+
+    level = rt_hw_interrupt_disable();
+    pm = &_pm;
+    if (mode < pm->run_mode)
+    {
+        /* change system runing mode */
+        pm->ops->run(pm, mode);
+        /* changer device frequency */
+        _pm_device_frequency_change(mode);
+    }
+    else
+    {
+        pm->flags |= RT_PM_FREQUENCY_PENDING;
+    }
+    pm->run_mode = mode;
+    rt_hw_interrupt_enable(level);
+
+    return RT_EOK;
+}
+
 /**
  * This function will initialize power management.
  *
@@ -466,37 +477,23 @@ void rt_system_pm_init(const struct rt_pm_ops *ops,
     /* register PM device to the system */
     rt_device_register(device, "pm", RT_DEVICE_FLAG_RDWR);
 
-    /* todo : add to kernel source code */
-    rt_thread_idle_sethook(rt_pm_enter);
-
     rt_memset(pm->modes, 0, sizeof(pm->modes));
-    pm->current_mode = PM_RUN_MODE_DEFAULT;
-
+    pm->sleep_mode = _pm_default_sleep;
+    pm->run_mode   = RT_PM_DEFAULT_RUN_MODE;
     pm->timer_mask = timer_mask;
 
     pm->ops = ops;
 
     pm->device_pm = RT_NULL;
     pm->device_pm_number = 0;
-
-    /* initialize semaphore */
-    rt_sem_init(&(pm->device_lock), "pm", 1, RT_IPC_FLAG_FIFO);
-
-    /* request in default running mode */
-    rt_pm_request(PM_RUN_MODE_DEFAULT);
-
-#ifdef PM_SLEEP_MODE_DEFAULT
-    /* request in default sleep mode */
-    rt_pm_request(PM_SLEEP_MODE_DEFAULT);
-#endif
-
-    /* must hold on deep shutdown mode */
-    rt_pm_request(PM_MODE_MAX);
 }
 
 #ifdef RT_USING_FINSH
 #include <finsh.h>
 
+static const char *_pm_sleep_str[] = PM_SLEEP_MODE_NAMES;
+static const char *_pm_run_str[] = PM_RUN_MODE_NAMES;
+
 static void rt_pm_release_mode(int argc, char **argv)
 {
     int mode = 0;
@@ -521,9 +518,20 @@ static void rt_pm_request_mode(int argc, char **argv)
 }
 MSH_CMD_EXPORT_ALIAS(rt_pm_request_mode, pm_request, request power management mode);
 
+static void rt_pm_run_mode_switch(int argc, char **argv)
+{
+    int mode = 0;
+    if (argc >= 2)
+    {
+        mode = atoi(argv[1]);
+    }
+
+    rt_pm_run_enter(mode);
+}
+MSH_CMD_EXPORT_ALIAS(rt_pm_run_mode_switch, pm_run, switch power management run mode);
+
 static void rt_pm_dump_status(void)
 {
-    static const char *pm_str[] = PM_MODE_NAMES;
     rt_uint32_t index;
     struct rt_pm *pm;
 
@@ -531,17 +539,18 @@ static void rt_pm_dump_status(void)
 
     rt_kprintf("| Power Management Mode | Counter | Timer |\n");
     rt_kprintf("+-----------------------+---------+-------+\n");
-    for (index = 0; index <= PM_MODE_MAX; index ++)
+    for (index = 0; index < PM_SLEEP_MODE_MAX; index ++)
     {
         int has_timer = 0;
         if (pm->timer_mask & (1 << index))
             has_timer = 1;
 
-        rt_kprintf("| %021s | %7d | %5d |\n", pm_str[index], pm->modes[index], has_timer);
+        rt_kprintf("| %021s | %7d | %5d |\n", _pm_sleep_str[index], pm->modes[index], has_timer);
     }
     rt_kprintf("+-----------------------+---------+-------+\n");
 
-    rt_kprintf("pm current mode: %s\n", pm_str[pm->current_mode]);
+    rt_kprintf("pm current sleep mode: %s\n", _pm_sleep_str[pm->sleep_mode]);
+    rt_kprintf("pm current run mode:   %s\n", _pm_run_str[pm->run_mode]);
 }
 FINSH_FUNCTION_EXPORT_ALIAS(rt_pm_dump_status, pm_dump, dump power management status);
 MSH_CMD_EXPORT_ALIAS(rt_pm_dump_status, pm_dump, dump power management status);
diff --git a/examples/pm/timer_app.c b/examples/pm/timer_app.c
index 5c20d0f690..b7ff675b39 100644
--- a/examples/pm/timer_app.c
+++ b/examples/pm/timer_app.c
@@ -6,6 +6,7 @@
  * Change Logs:
  * Date           Author       Notes
  * 2018-08-07     Tanek        first implementation
+ * 2019-05-06     Zero-Free    adapt to the new power management interface
  */
 
 #include <board.h>
@@ -39,7 +40,7 @@ static int timer_app_init(void)
         rt_timer_start(timer1);
 
         /* keep in timer mode */
-        rt_pm_request(PM_SLEEP_MODE_TIMER);
+        rt_pm_request(PM_SLEEP_MODE_DEEP);
 
         return 0;
     }
diff --git a/src/idle.c b/src/idle.c
index e685a7ddfc..77b0424892 100644
--- a/src/idle.c
+++ b/src/idle.c
@@ -228,6 +228,7 @@ void rt_thread_idle_excute(void)
     }
 }
 
+extern void rt_system_power_manager(void);
 static void rt_thread_idle_entry(void *parameter)
 {
 #ifdef RT_USING_SMP
@@ -255,6 +256,9 @@ static void rt_thread_idle_entry(void *parameter)
 #endif
 
         rt_thread_idle_excute();
+#ifdef RT_USING_PM        
+        rt_system_power_manager();
+#endif
     }
 }