main.cpp

00001 #include "mbed.h"
00002 
00003  #define IWDG_START 0x0000CCCC
00004  #define IWDG_WRITE_ACCESS 0x00005555
00005  #define IWDG_PR_PR_0 7
00006  #define IWDG_RELOAD 512*60
00007  #define IWDG_REFRESH 0xAAAA
00008  DigitalOut myled(LED1);
00009 int main()
00010 {
00011     /* (1) Activate IWDG (not needed if done in option bytes) */
00012     /* (2) Enable write access to IWDG registers */
00013     /* (3) Set prescaler by 8 */
00014     /* (4) Set reload value to have a rollover each 100ms */
00015     /* (5) Check if flags are reset */
00016     /* (6) Refresh counter */
00017     RCC_OscInitTypeDef RCC_OscInitStruct;
00018     RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
00019     RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_0;
00020     HAL_RCC_OscConfig(&RCC_OscInitStruct);
00021     
00022     IWDG->KR=IWDG_START;
00023     wait(5);
00024     IWDG->KR=IWDG_WRITE_ACCESS;
00025     IWDG->PR=IWDG_PR_PR_0;
00026     IWDG->RLR=IWDG_RELOAD;
00027     while(IWDG->SR) { 
00028         wait(0.1);   
00029     }
00030     //SwitchFromPLLtoHSI();
00031     //RCC->CFGR = (
00032     //0x00008000
00033     myled = 1;
00034     wait(3);
00035     myled = 0;
00036     wait(10);
00037    IWDG->KR=IWDG_REFRESH;/* (6) */
00038     //HAL_PWR_EnterSTOPMode(PWR_MAINREGULATOR_ON, PWR_STOPENTRY_WFI);
00039     deepsleep();
00040     while(1) {
00041         
00042     }
00043 }