[bsp][mcxn236] Add software i2c driver.

3 files changed, 253 insertions, 0 deletions

diff --git a/bsp/nxp/mcx/mcxn/Libraries/drivers/SConscript b/bsp/nxp/mcx/mcxn/Libraries/drivers/SConscript
index de8052d465..7081288d85 100644
--- a/bsp/nxp/mcx/mcxn/Libraries/drivers/SConscript
+++ b/bsp/nxp/mcx/mcxn/Libraries/drivers/SConscript
@@ -22,6 +22,9 @@ if  GetDepend('BSP_USING_SDIO'):
 if  GetDepend('BSP_USING_I2C'):
     src += ['drv_i2c.c']
 
+if  GetDepend('BSP_USING_SW_I2C'):
+    src += ['drv_soft_i2c.c']
+
 if  GetDepend('BSP_USING_ADC'):
     src += ['drv_adc.c']
 
diff --git a/bsp/nxp/mcx/mcxn/Libraries/drivers/drv_soft_i2c.c b/bsp/nxp/mcx/mcxn/Libraries/drivers/drv_soft_i2c.c
new file mode 100644
index 0000000000..5190ee4a59
--- /dev/null
+++ b/bsp/nxp/mcx/mcxn/Libraries/drivers/drv_soft_i2c.c
@@ -0,0 +1,228 @@
+/*
+ * Copyright (c) 2006-2024 RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2024-06-25     Andeyqi      the first version
+ */
+#include <rtthread.h>
+#include <rthw.h>
+#include <rtdevice.h>
+#include <board.h>
+
+#ifdef BSP_USING_SW_I2C
+
+#define LOG_TAG              "drv.i2c"
+#include <rtdbg.h>
+
+/* MCXNXXX config class */
+struct mcxnxxx_soft_i2c_config
+{
+    rt_uint8_t scl;
+    rt_uint8_t sda;
+    const char *bus_name;
+};
+
+/* MCXNXXX i2c dirver class */
+struct mcxnxxx_i2c
+{
+    struct rt_i2c_bit_ops ops;
+    struct rt_i2c_bus_device i2c2_bus;
+};
+
+#if defined(BSP_USING_SW_I2C0)
+#define SW_I2C0_BUS_CONFIG                               \
+    {                                                    \
+        .scl = BSP_SW_I2C0_SCL_PIN,                      \
+        .sda = BSP_SW_I2C0_SDA_PIN,                      \
+        .bus_name = "swi2c0",                            \
+    }
+#endif
+
+static const struct mcxnxxx_soft_i2c_config soft_i2c_config[] =
+{
+#if defined(BSP_USING_SW_I2C0)
+    SW_I2C0_BUS_CONFIG,
+#endif
+};
+
+static struct mcxnxxx_i2c i2c_obj[sizeof(soft_i2c_config) / sizeof(soft_i2c_config[0])];
+
+/**
+  * @brief  This function initializes the i2c pin.
+  * @param  i2c
+  * @retval None
+  */
+static void mcxnxxx_i2c_gpio_init(struct mcxnxxx_i2c *i2c)
+{
+    struct mcxnxxx_soft_i2c_config* cfg = (struct mcxnxxx_soft_i2c_config*)i2c->ops.data;
+
+    rt_pin_mode(cfg->scl, PIN_MODE_OUTPUT_OD);
+    rt_pin_mode(cfg->sda, PIN_MODE_OUTPUT_OD);
+
+    rt_pin_write(cfg->scl, PIN_HIGH);
+    rt_pin_write(cfg->sda, PIN_HIGH);
+}
+
+/**
+  * @brief  This function sets the sda pin.
+  * @param  data, state
+  * @retval None
+  */
+static void mcxnxxx_set_sda(void *data, rt_int32_t state)
+{
+    struct mcxnxxx_soft_i2c_config* cfg = (struct mcxnxxx_soft_i2c_config*)data;
+
+    rt_pin_mode(cfg->sda, PIN_MODE_OUTPUT_OD);
+
+    if (state)
+    {
+        rt_pin_write(cfg->sda, PIN_HIGH);
+    }
+    else
+    {
+        rt_pin_write(cfg->sda, PIN_LOW);
+    }
+}
+
+/**
+  * @brief  This function sets the scl pin.
+  * @param  data, state
+  * @retval None
+  */
+static void mcxnxxx_set_scl(void *data, rt_int32_t state)
+{
+    struct mcxnxxx_soft_i2c_config* cfg = (struct mcxnxxx_soft_i2c_config*)data;
+
+    rt_pin_mode(cfg->scl, PIN_MODE_OUTPUT_OD);
+
+    if (state)
+    {
+        rt_pin_write(cfg->scl, PIN_HIGH);
+    }
+    else
+    {
+        rt_pin_write(cfg->scl, PIN_LOW);
+    }
+}
+
+/**
+  * @brief  This function gets the sda pin state.
+  * @param  data
+  * @retval None
+  */
+static rt_int32_t mcxnxxx_get_sda(void *data)
+{
+    struct mcxnxxx_soft_i2c_config* cfg = (struct mcxnxxx_soft_i2c_config*)data;
+
+    rt_pin_mode(cfg->sda, PIN_MODE_INPUT);
+
+    return rt_pin_read(cfg->sda);
+}
+
+
+/**
+  * @brief  This function gets the scl pin state.
+  * @param  data
+  * @retval None
+  */
+static rt_int32_t mcxnxxx_get_scl(void *data)
+{
+    struct mcxnxxx_soft_i2c_config* cfg = (struct mcxnxxx_soft_i2c_config*)data;
+
+    rt_pin_mode(cfg->scl,PIN_MODE_INPUT);
+
+    return rt_pin_read(cfg->scl);
+}
+
+/**
+  * @brief  The time delay function.
+  * @param  us
+  * @retval None
+  */
+static void mcxnxxx_udelay(rt_uint32_t us)
+{
+    rt_uint32_t frequency = CLOCK_GetCoreSysClkFreq();
+
+    int i = (frequency/ 4000000 * us);
+    while(i)
+    {
+        i--;
+    }
+}
+
+static const struct rt_i2c_bit_ops mcxnxxx_bit_ops_default =
+{
+    .data     = RT_NULL,
+    .set_sda  = mcxnxxx_set_sda,
+    .set_scl  = mcxnxxx_set_scl,
+    .get_sda  = mcxnxxx_get_sda,
+    .get_scl  = mcxnxxx_get_scl,
+    .udelay   = mcxnxxx_udelay,
+    .delay_us = 1,
+    .timeout  = 100
+};
+
+/**
+  * @brief  if i2c is locked, this function will unlock it
+  * @param  cfg
+  * @retval RT_EOK indicates successful unlock.
+  */
+static rt_err_t mcxnxxx_i2c_bus_unlock(const struct mcxnxxx_soft_i2c_config *cfg)
+{
+    rt_int32_t i = 0;
+
+    if (PIN_LOW == rt_pin_read(cfg->sda))
+    {
+        while (i++ < 9)
+        {
+            rt_pin_write(cfg->scl, PIN_HIGH);
+            mcxnxxx_udelay(100);
+            rt_pin_write(cfg->scl, PIN_LOW);
+            mcxnxxx_udelay(100);
+        }
+    }
+    if (PIN_LOW == rt_pin_read(cfg->sda))
+    {
+        return -RT_ERROR;
+    }
+
+    return RT_EOK;
+}
+
+/**
+  * @brief  I2C initialization function
+  * @param  None
+  * @retval RT_EOK indicates successful initialization.
+  */
+int rt_hw_soft_i2c_init(void)
+{
+    rt_size_t obj_num = sizeof(i2c_obj) / sizeof(struct mcxnxxx_i2c);
+    rt_err_t result;
+
+    for (int i = 0; i < obj_num; i++)
+    {
+        i2c_obj[i].ops = mcxnxxx_bit_ops_default;
+        i2c_obj[i].ops.data = (void*)&soft_i2c_config[i];
+        i2c_obj[i].i2c2_bus.priv = &i2c_obj[i].ops;
+        mcxnxxx_i2c_gpio_init(&i2c_obj[i]);
+
+        result = rt_i2c_bit_add_bus(&i2c_obj[i].i2c2_bus, soft_i2c_config[i].bus_name);
+
+        RT_ASSERT(result == RT_EOK);
+
+        mcxnxxx_i2c_bus_unlock(&soft_i2c_config[i]);
+
+        LOG_D("software simulation %s init done, pin scl: %d, pin sda %d",
+        soft_i2c_config[i].bus_name,
+        soft_i2c_config[i].scl,
+        soft_i2c_config[i].sda);
+    }
+
+    return RT_EOK;
+}
+INIT_APP_EXPORT(rt_hw_soft_i2c_init);
+
+#endif /* RT_USING_I2C */
diff --git a/bsp/nxp/mcx/mcxn/frdm-mcxn236/board/Kconfig b/bsp/nxp/mcx/mcxn/frdm-mcxn236/board/Kconfig
index 93452d780e..44f287a0f2 100644
--- a/bsp/nxp/mcx/mcxn/frdm-mcxn236/board/Kconfig
+++ b/bsp/nxp/mcx/mcxn/frdm-mcxn236/board/Kconfig
@@ -53,6 +53,28 @@ menu "On-chip Peripheral Drivers"
                     default y
             endif
 
+    menuconfig BSP_USING_SW_I2C
+        bool "Enable I2C BUS (software simulation)"
+        default n
+        select RT_USING_I2C
+        select RT_USING_I2C_BITOPS
+        select RT_USING_PIN
+        if BSP_USING_SW_I2C
+            config BSP_USING_SW_I2C0
+                bool "Enable soft I2C0"
+                default y
+            if BSP_USING_SW_I2C0
+                config BSP_SW_I2C0_SCL_PIN
+                    int "SWI2C0 scl pin number"
+                    range 0 159
+                    default 129
+                config BSP_SW_I2C0_SDA_PIN
+                    int "SWI2C0 sda pin number"
+                    range 0 159
+                    default 128
+                endif
+        endif
+
     menuconfig BSP_USING_SPI
         config BSP_USING_SPI
             bool "Enable SPI"