[add] wwdg driver.

bsp/stm32/stm32mp157a-st-ev1/board/Kconfig

@@ -101,6 +101,12 @@ menu "On-chip Peripheral Drivers"
         bool "Enable GPIO"
         select RT_USING_PIN
         default y
+        
+    config BSP_USING_WWDG
+        bool "Enable WWDG"
+        select RT_USING_WWDG
+        select RT_USING_WDT
+        default n
 
     config BSP_USING_QSPI
         bool "Enable QSPI BUS"

bsp/stm32/stm32mp157a-st-ev1/board/SConscript

@@ -52,6 +52,9 @@ if GetDepend(['BSP_USING_SPDIFRX']):
 if GetDepend(['BSP_USING_DFSDM']):
     src += Glob('ports/drv_dfsdm.c')
 
+if GetDepend(['BSP_USING_WWDG']):
+    src += Glob('ports/drv_wwdg.c')
+
 if GetDepend(['BSP_USING_OPENAMP']):
     src +=  Glob('CubeMX_Config/CM4/Src/ipcc.c')
     src +=  Glob('CubeMX_Config/CM4/Src/openamp.c')

bsp/stm32/stm32mp157a-st-ev1/board/ports/drv_wwdg.c

@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2006-2018, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author            Notes
+ * 2020-06-18     thread-liu        the first version
+ */
+
+#include <board.h>
+
+#if defined(BSP_USING_WWDG)
+#include "drv_config.h"
+#include <string.h>
+#include <stdlib.h>
+
+//#define DRV_DEBUG
+#define LOG_TAG             "drv.wwg"
+#include <drv_log.h>
+
+#define LED5_PIN  GET_PIN(A, 14)
+
+static rt_uint8_t feed_flag = 0;
+static WWDG_HandleTypeDef hwwdg1;  
+
+void WWDG1_IRQHandler(void)
+{
+    /* enter interrupt */
+    rt_interrupt_enter();
+    
+    HAL_WWDG_IRQHandler(&hwwdg1);
+    
+    /* leave interrupt */
+    rt_interrupt_leave();
+}
+
+void HAL_WWDG_EarlyWakeupCallback(WWDG_HandleTypeDef* hwwdg)
+{
+    if(hwwdg->Instance==WWDG1)
+    {
+        if (feed_flag)
+        {
+            HAL_WWDG_Refresh(&hwwdg1);
+            HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_14);
+        }
+    }
+}
+
+static void wwdg_init()
+{
+    rt_pin_mode(LED5_PIN, PIN_MODE_OUTPUT);
+        
+    hwwdg1.Instance       = WWDG1;
+    hwwdg1.Init.Prescaler = WWDG_PRESCALER_8;
+    hwwdg1.Init.Window    = 0X5F;
+    hwwdg1.Init.Counter   = 0x7F;
+    hwwdg1.Init.EWIMode   = WWDG_EWI_ENABLE;
+      
+    if (HAL_WWDG_Init(&hwwdg1) != HAL_OK)
+    {
+        Error_Handler();
+    }
+    
+    feed_flag = 1;
+}
+
+static void wwdg_control(uint8_t pre_value)
+{
+    if(pre_value > 7)
+    {
+       pre_value = 7; 
+    }
+    hwwdg1.Instance->CFR &= ~(7 << 11);     /* clear WDGTB[2:0] */
+    hwwdg1.Instance->CFR |= pre_value << 11; /* set WDGTB[2:0] */	
+}
+
+static void wwdg_stop(void)
+{
+    feed_flag = 0;
+}
+
+static int wwdg_sample(int argc, char *argv[])
+{
+    if (argc > 1)
+    {
+        if (!strcmp(argv[1], "run"))
+        { 
+            wwdg_init();
+        }
+        else if (!strcmp(argv[1], "set"))
+        {
+            if (argc > 2)
+            {
+                wwdg_control(atoi(argv[2]));
+            }     
+        }
+        else if (!strcmp(argv[1], "stop"))
+        {
+            wwdg_stop();
+        }
+    }
+    else
+    {
+        rt_kprintf("Usage:\n");
+        rt_kprintf("wwdg_sample run            - open wwdg, when feed wwdg in wwdg irq, the LD5 will blink\n");
+        rt_kprintf("wwdg_sample stop           - stop to feed wwdg, system will reset\n");
+        rt_kprintf("wwdg_sample set            - set the wwdg prescaler, wwdg_sample set [0 - 7]\n");
+    }
+
+    return RT_EOK;
+}
+MSH_CMD_EXPORT(wwdg_sample, window watch dog sample);
+
+#endif