#include "rtc.h" #include "base.h" #include "stm32f4xx.h" int RTC_InitNormal(RTC_InitStruct *init) { RTC_InitTypeDef RTC_InitStructure; uint16_t retry = 0X1FFF; // 使能PWR时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE); // 使能后备寄存器访问 PWR_BackupAccessCmd(ENABLE); // 是否第一次配置? if (RTC_ReadBackupRegister(RTC_BKP_DR0) != 0x5050) { // LSE 开启 RCC_LSEConfig(RCC_LSE_ON); // 检查指定的RCC标志位设置与否,等待低速晶振就绪 while (RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) { retry++; if (init->delay_ms) init->delay_ms(10); } // LSE 开启失败. if (retry == 0) return -1; // 设置RTC时钟(RTCCLK),选择LSE作为RTC时钟 RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); // 使能RTC时钟 RCC_RTCCLKCmd(ENABLE); // RTC异步分频系数(1~0X7F) RTC_InitStructure.RTC_AsynchPrediv = 0x7F; // RTC同步分频系数(0~7FFF) RTC_InitStructure.RTC_SynchPrediv = 0xFF; // RTC设置为,24小时格式 RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24; RTC_Init(&RTC_InitStructure); RTC_TimeTypeDef time = {0}; time.RTC_Hours = 12; time.RTC_H12 = RTC_H12_AM; RTC_SetTime(RTC_Format_BIN, &time); RTC_DateTypeDef data = {0}; data.RTC_Year = 19; data.RTC_Month = 12; data.RTC_Date = 3; data.RTC_WeekDay = 1; RTC_SetDate(RTC_Format_BIN, &data); // 标记已经初始化过了 RTC_WriteBackupRegister(RTC_BKP_DR0, 0x5050); } return 0; }