[ch32v307][bsp]添加了看门狗驱动 (#6474)

添加了 ch32v307 看门狗驱动，已在 ch32v307评估板验证；
修改了 rt-thread\bsp\wch\risc-v\ch32v307v-r1\board 目录下的 Kconfig 文件；
修改了 rt-thread\bsp\wch\risc-v\Libraries\ch32_drivers 目录下的 SConscript 文件；
添加了 rt-thread\bsp\wch\risc-v\Libraries\ch32_drivers 目录下的 drv_iwdt.c 文件；

3 files changed, 143 insertions, 9 deletions

diff --git a/bsp/wch/risc-v/Libraries/ch32_drivers/SConscript b/bsp/wch/risc-v/Libraries/ch32_drivers/SConscript
index 84aa3254dc..88f37b0e62 100644
--- a/bsp/wch/risc-v/Libraries/ch32_drivers/SConscript
+++ b/bsp/wch/risc-v/Libraries/ch32_drivers/SConscript
@@ -29,6 +29,9 @@ if  GetDepend('SOC_RISCV_FAMILY_CH32'):
     if GetDepend(['RT_USING_RTC', 'BSP_USING_RTC']):
         src += ['drv_rtc.c']
 
+    if GetDepend(['RT_USING_WDT', 'BSP_USING_IWDT']):
+        src += ['drv_iwdt.c']
+
 path =  [cwd]
 
 group = DefineGroup('Drivers', src, depend = [''], CPPPATH = path)
diff --git a/bsp/wch/risc-v/Libraries/ch32_drivers/drv_iwdt.c b/bsp/wch/risc-v/Libraries/ch32_drivers/drv_iwdt.c
new file mode 100644
index 0000000000..53d350dbca
--- /dev/null
+++ b/bsp/wch/risc-v/Libraries/ch32_drivers/drv_iwdt.c
@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2021-08-10     charlown          first version
+ * 2022-09-27     hg0720            the first version which add from wch
+ */
+
+#include <rtthread.h>
+#include <rtdevice.h>
+#include <board.h>
+#include "ch32v30x_iwdg.h"
+
+#ifdef BSP_USING_IWDT
+
+#define LOG_TAG "drv.wdt"
+#include "drv_log.h"
+
+#ifndef LSI_VALUE
+#error "Please define the value of LSI_VALUE!"
+#endif
+
+struct watchdog_device
+{
+    rt_watchdog_t parent;
+    IWDG_TypeDef *instance;
+    rt_uint32_t prescaler;
+    rt_uint32_t reload;
+    rt_uint16_t is_start;
+};
+static struct watchdog_device watchdog_dev;
+
+static rt_err_t ch32_wdt_init(rt_watchdog_t *wdt)
+{
+    return RT_EOK;
+}
+
+static rt_err_t ch32_wdt_control(rt_watchdog_t *wdt, int cmd, void *arg)
+{
+    struct watchdog_device *wdt_dev;
+
+    wdt_dev = (struct watchdog_device *)wdt;
+
+    switch (cmd)
+    {
+    /* feed the watchdog */
+    case RT_DEVICE_CTRL_WDT_KEEPALIVE:
+        IWDG_ReloadCounter();
+        break;
+        /* set watchdog timeout */
+    case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
+        if (LSI_VALUE)
+        {
+            wdt_dev->reload = (*((rt_uint32_t *)arg)) * LSI_VALUE / 256;
+        }
+        else
+        {
+            LOG_E("Please define the value of LSI_VALUE!");
+        }
+        if (wdt_dev->reload > 0xFFF)
+        {
+            LOG_E("wdg set timeout parameter too large, please less than %ds", 0xFFF * 256 / LSI_VALUE);
+            return -RT_EINVAL;
+        }
+
+        if (wdt_dev->is_start)
+        {
+            IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
+            IWDG_SetPrescaler(wdt_dev->prescaler);
+            IWDG_SetReload(wdt_dev->reload);
+            IWDG_WriteAccessCmd(IWDG_WriteAccess_Disable);
+            IWDG_Enable();
+        }
+        break;
+    case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
+        if (LSI_VALUE)
+        {
+            (*((rt_uint32_t *)arg)) = wdt_dev->reload * 256 / LSI_VALUE;
+        }
+        else
+        {
+            LOG_E("Please define the value of LSI_VALUE!");
+        }
+        break;
+    case RT_DEVICE_CTRL_WDT_START:
+        IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
+        IWDG_SetPrescaler(wdt_dev->prescaler);
+        IWDG_SetReload(wdt_dev->reload);
+        IWDG_WriteAccessCmd(IWDG_WriteAccess_Disable);
+        IWDG_Enable();
+        wdt_dev->is_start = 1;
+        break;
+    default:
+        LOG_W("This command is not supported.");
+        return -RT_ERROR;
+    }
+    return RT_EOK;
+}
+
+static struct rt_watchdog_ops watchdog_ops =
+{
+    .init = ch32_wdt_init,
+    .control = ch32_wdt_control,
+};
+
+int rt_hw_wdt_init(void)
+{
+    watchdog_dev.instance = IWDG;
+    watchdog_dev.prescaler = IWDG_Prescaler_256;
+    watchdog_dev.reload = 0x0000FFF;
+    watchdog_dev.is_start = 0;
+    watchdog_dev.parent.ops = &watchdog_ops;
+    /* register watchdog device */
+    if (rt_hw_watchdog_register(&watchdog_dev.parent, "wdt", RT_DEVICE_FLAG_DEACTIVATE, RT_NULL) != RT_EOK)
+    {
+        LOG_E("wdt device register failed.");
+        return -RT_ERROR;
+    }
+    LOG_D("wdt device register success.");
+    return RT_EOK;
+}
+INIT_BOARD_EXPORT(rt_hw_wdt_init);
+
+#endif /* BSP_USING_IWDT */
diff --git a/bsp/wch/risc-v/ch32v307v-r1/board/Kconfig b/bsp/wch/risc-v/ch32v307v-r1/board/Kconfig
index 0a9f387fe6..84424f9200 100644
--- a/bsp/wch/risc-v/ch32v307v-r1/board/Kconfig
+++ b/bsp/wch/risc-v/ch32v307v-r1/board/Kconfig
@@ -127,17 +127,21 @@ menu "On-chip Peripheral Drivers"
         select RT_USING_RTC
         default n
         if BSP_USING_RTC
-            choice
-                prompt "Select clock source"
-                default BSP_RTC_USING_LSE
+                config BSP_USING_RTC_LSI
+                        bool "using LSI clock for rtc, if not, LSE default"
+                        select LSI_VALUE
+                        default n
+        endif
 
-                config BSP_RTC_USING_LSE
-                    bool "RTC USING LSE"
+    config LSI_VALUE
+        int
+        default 40000
 
-                config BSP_RTC_USING_LSI
-                    bool "RTC USING LSI"
-            endchoice
-        endif
+    config BSP_USING_IWDT
+        bool "using onchip iwdt"
+        select RT_USING_WDT
+        select LSI_VALUE
+        default n
 
 endmenu