Solved
RTC is getting set off by 1hour in STM32U5. I am using Nucleo board and I am checking the RTC behavior in STOP3 mode of stm32u5.
#include "main.h"
#include <stdio.h>
#include <string.h>
RTC_HandleTypeDef hrtc;
UART_HandleTypeDef huart1;
/* USER CODE BEGIN PV */
#define UartHandle &huart1
#define RtcHandle &hrtc
static uint16_t YearStart = 2000;
char message[50];
uint8_t size;
uint8_t Rx_data;
void SystemClock_Config(void);
static void SystemPower_Config(void);
static void MX_GPIO_Init(void);
static void MX_RTC_Init(void);
static void MX_USART1_UART_Init(void);
void set_time (void)
{
RTC_TimeTypeDef sTime;
RTC_DateTypeDef sDate;
size = sprintf(message, "\n\r RTC in Stop Mode\n\r");
HAL_UART_Transmit(UartHandle, (uint8_t*)message, size, 100);
// Set date and time
sDate.WeekDay = RTC_WEEKDAY_TUESDAY;
sDate.Date = 22;
sDate.Month = 03;
sDate.Year = 23; // from 0-99 (1972 == 72, start year = 1900)
HAL_RTC_SetDate(RtcHandle, &sDate, RTC_FORMAT_BIN);
sTime.Hours = 10;
sTime.Minutes = 45;
HAL_RTC_SetTime(RtcHandle, &sTime, RTC_FORMAT_BIN);
HAL_RTCEx_BKUPWrite(RtcHandle, RTC_BKP_DR0, 0xBEBE);
}
void get_time(void)
{
static RTC_TimeTypeDef sTime;
static RTC_DateTypeDef sDate;
static char message[50];
static size_t size;
// Get current time and date
HAL_RTC_GetDate(&hrtc, &sDate, RTC_FORMAT_BIN);
HAL_RTC_GetTime(&hrtc, &sTime, RTC_FORMAT_BIN);
// Send time and date over uart
size = sprintf(message, "Date: %2.2u-%2.2u-%4.4u Time: %2.2u:%2.2u:%2.2u\n\r", sDate.Date, sDate.Month, sDate.Year + YearStart,sTime.Hours, sTime.Minutes, sTime.Seconds);
HAL_UART_Transmit(UartHandle, (uint8_t*)message, size, 100);
HAL_Delay(1000);
}
void HAL_GPIO_EXTI_Rising_Callback(uint16_t GPIO_Pin)
{
if(GPIO_Pin == GPIO_PIN_13)
{
SystemClock_Config();
size = sprintf(message, "\n\r After Sleep Mode \n\r");
HAL_UART_Transmit(UartHandle, (uint8_t*)message, size, 100);
get_time();
}
}
int main(void)
{
HAL_Init();
SystemClock_Config();
SystemPower_Config();
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_RTC_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
if(HAL_RTCEx_BKUPRead(&hrtc, RTC_BKP_DR0) != 0xBEBE )
{
set_time();
}
size = sprintf(message, "\n\r Before Stop Mode \n\r");
HAL_UART_Transmit(UartHandle, (uint8_t*)message, size, 50);
get_time();
/* Check and Clear the Wakeup flag */
/* Enable Backup domain access */
HAL_SuspendTick();
// wake up using external interrupt using user button
HAL_PWREx_EnterSTOP3Mode(PWR_STOPENTRY_WFI);
HAL_ResumeTick();
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* 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
*/
if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE4) != HAL_OK)
{
Error_Handler();
}
/** Configure LSE Drive Capability
*/
HAL_PWR_EnableBkUpAccess();
__HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE|RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
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_CLOCKTYPE_PCLK2
|RCC_CLOCKTYPE_PCLK3;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSE;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB3CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief Power Configuration
* @retval None
*/
static void SystemPower_Config(void)
{
/*
* Switch to SMPS regulator instead of LDO
*/
if (HAL_PWREx_ConfigSupply(PWR_SMPS_SUPPLY) != HAL_OK)
{
Error_Handler();
}
}
static void MX_RTC_Init(void)
{
/* USER CODE BEGIN RTC_Init 0 */
/* USER CODE END RTC_Init 0 */
RTC_PrivilegeStateTypeDef privilegeState = {0};
/* USER CODE BEGIN RTC_Init 1 */
/* USER CODE END RTC_Init 1 */
/** Initialize RTC Only
*/
hrtc.Instance = RTC;
hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
hrtc.Init.AsynchPrediv = 127;
hrtc.Init.SynchPrediv = 255;
hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
hrtc.Init.OutPutRemap = RTC_OUTPUT_REMAP_NONE;
hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
hrtc.Init.OutPutPullUp = RTC_OUTPUT_PULLUP_NONE;
hrtc.Init.BinMode = RTC_BINARY_NONE;
if (HAL_RTC_Init(&hrtc) != HAL_OK)
{
Error_Handler();
}
privilegeState.rtcPrivilegeFull = RTC_PRIVILEGE_FULL_NO;
privilegeState.backupRegisterPrivZone = RTC_PRIVILEGE_BKUP_ZONE_NONE;
privilegeState.backupRegisterStartZone2 = RTC_BKP_DR0;
privilegeState.backupRegisterStartZone3 = RTC_BKP_DR0;
if (HAL_RTCEx_PrivilegeModeSet(&hrtc, &privilegeState) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN RTC_Init 2 */
/* USER CODE END RTC_Init 2 */
}
}
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOH_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin : PC13 */
GPIO_InitStruct.Pin = GPIO_PIN_13;
GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
/* EXTI interrupt init*/
HAL_NVIC_SetPriority(EXTI13_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(EXTI13_IRQn);
}