1.打开STM32CubeMX选择好对应的芯片，打开IWDG
2.打开串口1进行调试
3.配置好时钟
4.写好项目名称，选好开发环境，最后获取代码。
5.打开工程，点击魔术棒，勾选Use Micro LIB
6.修改main.c
#include "main.h"
#include "iwdg.h"
#include "usart.h"
#include "gpio.h"
#include <stdio.h>
#include <stm32_hal_legacy.h>
void SystemClock_Config(void);
extern IWDG_HandleTypeDef hiwdg;
void PWR_Enter_Standby(void)
{
__HAL_RCC_PWR_CLK_ENABLE();
if (__HAL_PWR_GET_FLAG(PWR_FLAG_SB) != RESET)
{
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_SB);
if (__HAL_PWR_GET_FLAG(PWR_FLAG_WUF2) != RESET)
{
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF2);
}
if (__HAL_PWR_GET_FLAG(PWR_FLAG_WUF4) != RESET)
{
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF4);
}
}
HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN2_HIGH);
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WUF2);
//HAL_PWR_EnableWakeUpPin(PWR_WAKEUP_PIN4_HIGH);
HAL_PWR_EnterSTANDBYMode();
}
void IWDG_OBProgram(void)
{
/* 配置用户选项字节：在停止模式下冻结独立看门狗计数器 */
FLASH_OBProgramInitTypeDef obprogram_init;
/* 读取用户选项字节 */
HAL_FLASHEx_OBGetConfig(&obprogram_init);
printf("SYS USERConfig = 0x%x\r\n", obprogram_init.USERConfig);
/* 判断FLASH_OPTR寄存器的IWDG_STDBY位是否置位（不判断也行） */
if(obprogram_init.USERConfig & FLASH_OPTR_IWDG_STDBY)
{
/* 置位则清零IWDG_STOP位 */
obprogram_init.OptionType = OPTIONBYTE_USER;
obprogram_init.USERType = OB_USER_IWDG_STDBY;
obprogram_init.USERConfig = OB_IWDG_STDBY_FREEZE;
obprogram_init.RDPLevel = OB_RDP_LEVEL_0;
/* 以下流程是根据手册上提供的 */
HAL_FLASH_Unlock();
HAL_FLASH_OB_Unlock();
HAL_FLASHEx_OBProgram(&obprogram_init);
HAL_FLASH_OB_Lock();
HAL_FLASH_Lock();
/* OBL_LAUNCH：选项字节重载位，用来生效上述更改(如果OPTLOCK为0，将此位置1，则会导致复位，如果 OPTLOCK为1，则此位无法写入,MCU复位后此位默认置1) */
HAL_FLASH_OB_Launch();
HAL_FLASHEx_OBGetConfig(&obprogram_init);
printf("SET USERConfig = 0x%x\r\n", obprogram_init.USERConfig);
}
}
int main(void)
{
HAL_Init();
SystemClock_Config();
HAL_Delay(1000);
MX_GPIO_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
MX_IWDG_Init();
IWDG_OBProgram();
printf("code init \r\n");
while (1)
{
/* USER CODE END WHILE */
HAL_IWDG_Refresh(&hiwdg);
//HAL_Delay(500);
printf("PWR_Enter_Standby\r\n");
PWR_Enter_Standby();
printf("code start\r\n");
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_LSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.LSIState = RCC_LSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV1;
RCC_OscInitStruct.PLL.PLLN = 8;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */7.串口打印，修改了OB_USER_IWDG_STDBY，系统看门狗复位一次后就没有再复位了。
源码链接：跳转链接