Radoslav Oranski
Simple example of using independent watchdog timer (IWDG) with Nucleo F401RE board.
Revision 0:8d898804478b, committed 2014-10-23
- Comitter:
- batrado
- Date:
- Thu Oct 23 06:45:32 2014 +0000
- Commit message:
- Implementation of watchdog timer for Nucleo F401RE borad.
Changed in this revision
diff -r 000000000000 -r 8d898804478b DS1307.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DS1307.lib Thu Oct 23 06:45:32 2014 +0000 @@ -0,0 +1,1 @@ +http://developer.mbed.org/users/harrypowers/code/DS1307/#c3e4da8feb10
diff -r 000000000000 -r 8d898804478b main.cpp
--- /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
diff -r 000000000000 -r 8d898804478b mbed-src.lib --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-src.lib Thu Oct 23 06:45:32 2014 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed-src/#3a6dcb505230