Diff: main.cpp

Revision:

0:8d898804478b

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Oct 23 06:45:32 2014 +0000
@@ -0,0 +1,87 @@
+#include "mbed.h"
+#include "ds1307.h"
+#include "stm32f4xx_hal_iwdg.h"
+
+#if defined(TARGET_NUCLEO_F401RE)
+    DS1307 ds1307(PB_9, PB_8);  
+
+    IWDG_HandleTypeDef hiwdg;
+#endif
+
+/* Initializes the IWDG */
+void WatchdogInit(void) {
+
+    /* 
+        Watchdog freq. is 32 kHz
+        Prescaler: Min_Value = 4 and Max_Value = 256
+        Reload: Min_Data = 0 and Max_Data = 0x0FFF
+        TimeOut in seconds = (Reload * Prescaler) / Freq.
+        MinTimeOut = (4 * 1) / 32000 = 0.000125 seconds (125 microseconds)
+        MaxTimeOut = (256 * 4096) / 32000 = 32.768 seconds
+    */
+    hiwdg.Instance = IWDG;
+    hiwdg.Init.Prescaler = IWDG_PRESCALER_256; 
+    hiwdg.Init.Reload = 625;                
+    HAL_IWDG_Init(&hiwdg);
+
+}
+
+/* Starts the IWDG. */
+void WatchdogStart(void) {
+    HAL_IWDG_Start(&hiwdg);
+}
+
+/* Refreshes the IWDG. */
+void WatchdogRefresh(void) {
+    HAL_IWDG_Refresh(&hiwdg);
+}
+
+void WatchdogStatus(void) {
+    switch (HAL_IWDG_GetState(&hiwdg)) {
+        case HAL_IWDG_STATE_RESET:       /*!< IWDG not yet initialized or disabled */
+            printf("IWDG not yet initialized or disabled\r\n");
+            break;
+        case HAL_IWDG_STATE_READY:       /*!< IWDG initialized and ready for use   */
+            printf("IIWDG initialized and ready for use\r\n");
+            break;
+        case HAL_IWDG_STATE_BUSY:        /*!< IWDG internal process is ongoing     */
+            printf("IWDG internal process is ongoing\r\n");
+            break;
+        case HAL_IWDG_STATE_TIMEOUT:     /*!< IWDG timeout state                   */
+            printf("IWDG timeout state\r\n");
+            break;
+        case HAL_IWDG_STATE_ERROR:       /*!< IWDG error state                     */
+            printf("IWDG error state\r\n");
+            break;
+        default: 
+            printf("Unknown state\r\n");
+            break;
+    }
+}
+
+int main() {    
+    int sec = 0;
+    int min = 0;
+    int hour = 0;
+    int day = 0;
+    int date = 0;
+    int month = 0;
+    int year = 0;
+    int i = 0; 
+    
+    WatchdogInit(); // init a watchdog with 5 seconds timeout
+    WatchdogStatus();
+    WatchdogStart();
+    
+    while (true) {
+        ds1307.gettime(&sec, &min, &hour, &day, &date, &month, &year);
+        printf("%02d/%02d/%04d %02d:%02d:%02d\r\n", day, month, year, hour, min, sec);
+
+        if (i == 10) {
+            wait(10);
+        }
+        WatchdogRefresh();
+        i++;
+        wait(1); 
+    }
+}
\ No newline at end of file