BSP stm32f10x add watchdog driver

bsp/stm32f10x/drivers/SConscript

@@ -39,6 +39,10 @@ if GetDepend('RT_USING_RTGUI'):
     elif rtconfig.RT_USING_LCD_TYPE == 'SSD1289':
         src += ['ssd1289.c']
 
+# add wdt driver.
+if GetDepend('RT_USING_WDT'):
+    src += ['stm32f1_wdg.c']
+
     
 CPPPATH = [cwd]
 

bsp/stm32f10x/drivers/stm32f1_wdg.c

@@ -0,0 +1,118 @@
+/*
+ * File      : stm32f1_wdg.c
+ * This file is part of RT-Thread RTOS
+ * COPYRIGHT (C) 2006-2013, RT-Thread Development Team
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rt-thread.org/license/LICENSE
+ *
+ * Change Logs:
+ * Date           Author                Notes
+ * 2017-01-18     aubrcool@qq.com       1st version
+ */
+#include "stm32f10x.h"
+#include <rtdevice.h>
+
+#ifdef RT_USING_WDT
+
+static rt_err_t stm32f1_wdg_init(rt_watchdog_t *wdt)
+{
+    return RT_EOK;
+}
+static rt_err_t stm32f1_wdg_control(rt_watchdog_t *wdt, int cmd, void *arg)
+{
+     rt_uint32_t timeout_ms = 0;
+     rt_uint32_t timeout_pow = 1;
+     switch(cmd)
+     {
+     case RT_DEVICE_CTRL_WDT_SET_TIMEOUT:
+          timeout_ms = (rt_uint32_t) arg;
+          IWDG_WriteAccessCmd(IWDG_WriteAccess_Enable);
+          if(timeout_ms >= 13107)
+          {
+              if(timeout_ms >= 26214)
+              {
+                  timeout_ms = 26214;
+              }
+              IWDG_SetPrescaler(IWDG_Prescaler_256);
+              timeout_pow = 256;
+          }
+          else if(timeout_ms >= 6553)
+          {
+              IWDG_SetPrescaler(IWDG_Prescaler_128);
+              timeout_pow = 128;
+          }
+          else if(timeout_ms >= 3276)
+          {
+              IWDG_SetPrescaler(IWDG_Prescaler_64);
+              timeout_pow = 64;
+          }
+          else if(timeout_ms >= 1638)
+          {
+              IWDG_SetPrescaler(IWDG_Prescaler_32);
+              timeout_pow = 32;
+          }
+          else if(timeout_ms >= 819)
+          {
+              IWDG_SetPrescaler(IWDG_Prescaler_16);
+              timeout_pow = 16;
+          }
+          else if(timeout_ms >= 409)
+          {
+              IWDG_SetPrescaler(IWDG_Prescaler_8);
+              timeout_pow = 8;
+          }
+          else
+          {
+              IWDG_SetPrescaler(IWDG_Prescaler_4);
+              timeout_pow = 4;
+          }
+          timeout_ms = timeout_ms * 40 / timeout_pow;
+          if(timeout_ms > 0xFFF)
+          {
+              timeout_ms = 0xFFF;
+          }
+          IWDG_SetReload(timeout_ms);
+          IWDG_ReloadCounter();
+       break;
+     case RT_DEVICE_CTRL_WDT_GET_TIMEOUT:
+          timeout_pow = IWDG->PR;
+          if(timeout_pow > 6)
+          {
+               timeout_pow = 6;
+          }
+          timeout_pow = 1 << (2 + timeout_pow);
+          timeout_ms = IWDG->RLR;
+          timeout_ms &= 0xFFF;
+          *((rt_uint32_t *) arg) = timeout_ms * timeout_pow / 40;
+       break;
+     case RT_DEVICE_CTRL_WDT_KEEPALIVE:
+          IWDG_ReloadCounter();
+       break;
+     case RT_DEVICE_CTRL_WDT_START:
+          IWDG_Enable();
+       break;
+     default:
+       return RT_EIO;
+     }
+     return RT_EOK;
+}
+
+static const struct rt_watchdog_ops stm32f1_wdg_pos =
+{
+     stm32f1_wdg_init,
+     stm32f1_wdg_control,
+};
+static rt_watchdog_t stm32f1_wdg;
+
+int rt_hw_wdg_init(void)
+{
+    stm32f1_wdg.ops = &stm32f1_wdg_pos;
+    rt_hw_watchdog_register(&stm32f1_wdg, "wdg",  0, RT_NULL);
+    return RT_EOK;
+}
+
+INIT_BOARD_EXPORT(rt_hw_wdg_init);
+
+#endif /*RT_USING_WDT*/

components/drivers/include/drivers/watchdog.h

@@ -38,7 +38,7 @@ struct rt_watchdog_ops;
 struct rt_watchdog_device
 {
     struct rt_device parent;
-    struct rt_watchdog_ops *ops;
+    const struct rt_watchdog_ops *ops;
 };
 typedef struct rt_watchdog_device rt_watchdog_t;