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Nucleo-STM32H563ZI RTC SSR Value Jump Back
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2024-03-01 03:12 AM - last edited on 2024-03-04 02:54 AM by Sarra.S
I am programming a Nucleo-STM32H563ZI and get a problem while trying to get subseconds value in RTC.
Below is the main code:
unsigned prev_ssr = 0;
char print_buf[32] = { 0 };
unsigned this_ssr;
int count;
while (1)
{
this_ssr = READ_REG(RTC->SSR);
if (this_ssr != prev_ssr) {
count = sprintf(print_buf, "%05u-->%05u\n", prev_ssr, this_ssr);
HAL_UART_Transmit(&huart3, (uint8_t const*)print_buf, count, 10);
prev_ssr = this_ssr;
}
}
SSR SynchPrediv is 255 as default. It takes about 3.9ms to decrease by 1.
UART baudrate is 115200. It takes about 1.2ms to send a data package which has 14 bytes.
So this program could catch every normal change of SSR value. And the UART output data verify this.
But in the UART output data, I found some lines like this:
00030-->00029
00029-->00028
00028-->00031
00031-->00027
00027-->00026
00026-->00025
That tells us the SSR value would jump back sometimes.
And it happens about 3 or 4 times per second! I don't know whether some jumps escape.
The jump back value is always 3 (31-8= 3).
Do I take some mistake in STM32CubeIDE project or my code?
Labels:
- Labels:
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RTC
-
STM32H5 Series
2 REPLIES 2
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2024-03-01 04:46 AM
Welcome @floatsky, to the community!
You are reading a shadow register. Your problem has already been discussed e.g. here, probably that will help you too?
Regards
/Peter
In order to give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
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2024-03-04 06:24 AM
@Peter BENSCHThanks for attention.
I read the topic you mentioned. I get the knowledge that CR.BYPSHAD and ICSR.RSF work together to synchronize the 3 registers: SSR, TR, DR. Thank you for your information.
The problem in that topic looks like the same with mine. But they are not.
In my program, I read only one register, SSR, not all of the 3.
I modify my program as below:
1. Verify that BYPSHAD is 0, which is default.
2. Clear RSF and wait until it's set again by RTC hardware.
3. Read the 3 registers in the order of SSR, TR, DR.
/* USER CODE BEGIN WHILE */
unsigned prev_ssr = 0;
unsigned this_ssr, tick, tr, dr;
int count;
char print_buf[32] = { 0 };
while (1) {
/* Unlock write protection */
WRITE_REG(RTC->WPR, 0xCA);
WRITE_REG(RTC->WPR, 0x53);
/* Clear Registers Synchronization Flag(RSF) */
CLEAR_BIT(RTC->ICSR, (1U << 5));
/* Reactivate write protection */
WRITE_REG(RTC->WPR, 0x11);
/* Wait for hardware setting RSF to 1 */
while ((READ_REG(RTC->ICSR) & (1U << 5)) == 0)
;
/* Read all 3 registers. */
this_ssr = READ_REG(RTC->SSR);
tr = READ_REG(RTC->TR);
dr = READ_REG(RTC->DR);
tick = HAL_GetTick();
if (this_ssr != prev_ssr) {
count = sprintf(print_buf, "%05u:%08u\n", this_ssr, tick);
HAL_UART_Transmit(&huart3, (uint8_t const*) print_buf, count, 10);
prev_ssr = this_ssr;
}
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */But the result does not change. I'm not sure I've wrote the right code. If there is something wrong in it, please let me know.
I also try another way: set BYPSHAD to 1:
/* USER CODE BEGIN WHILE */
unsigned prev_ssr = 0;
unsigned this_ssr, tick;
int count;
char print_buf[32] = { 0 };
/* Unlock write protection */
WRITE_REG(RTC->WPR, 0xCA);
WRITE_REG(RTC->WPR, 0x53);
/* Set BYPSHAD to 1 */
SET_BIT(RTC->CR, (1U << 5));
/* Reactivate write protection */
WRITE_REG(RTC->WPR, 0x11);
while (1) {
this_ssr = READ_REG(RTC->SSR);
tick = HAL_GetTick();
if (this_ssr != prev_ssr) {
count = sprintf(print_buf, "%05u:%08u\n", this_ssr, tick);
HAL_UART_Transmit(&huart3, (uint8_t const*) print_buf, count, 10);
prev_ssr = this_ssr;
}
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */Jumps much fewer than that while BYPSHAD equals 0. But in idea, there should be none. And indeed there's none in Nucleo-F030R8 and STM32F746G-DISCO.
I wrote a python script to assist analyzing serial output.
import re
from serial import Serial
from sys import stderr
# Usage:
# 1. Give a correct serial port name to the variable "port" below.
# 2. Plug development board to PC.
# 3. Debug the program using your prefer IDE. Pause at the entry main function.
# 3. Run this script. Wait until it output "Let's go!" to console.
# 4. Resume the program and keep it running.
pattern = re.compile(r'(\d+):(\d+)')
port = '/dev/ttyACM0'
serial = Serial(port, baudrate=115200, timeout=1)
count = 10000
prev_ssr = 0
summer = dict()
total = 0
log = open('SSR.log', 'w')
# skip garbage data
while serial.read_until(b'\n') != b'':
pass
print("Let's go!")
serial.timeout = None
for i in range(count):
line = serial.read_until(b'\n').decode().strip()
log.write(f'{i:05}:{line}\n')
match = re.match(pattern, line)
if not match:
print(f'Corrupted data line:[{line}]', file=stderr)
break
ssr_s, tick_s = match.groups()
ssr = int(ssr_s)
if ssr != prev_ssr:
diff = prev_ssr - ssr
if diff == 1 or (prev_ssr == 0 and ssr == 255):
pass
else:
total += 1
summer[diff] = summer.get(diff, 0) + 1
message = f'NO.{total:05} Jump. Prev: {prev_ssr:05}, Curr: {ssr:05}, Diff: {diff:05}, Line: {i:05}'
print(message, file=stderr)
prev_ssr = ssr
else:
message = f'Same value neighbors, at line {i:05}'
print(message, file=stderr)
log.close()
serial.close()
print(f'Total jumps: {total}.')
print(summer)And I find that I make a mistake in my first post: the jump back value is not always 3. Most of them are 3, not all.
Below is the main source code.
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2024 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdio.h>
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
DCACHE_HandleTypeDef hdcache1;
RTC_HandleTypeDef hrtc;
UART_HandleTypeDef huart3;
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_ICACHE_Init(void);
static void MX_RTC_Init(void);
static void MX_USART3_UART_Init(void);
static void MX_DCACHE1_Init(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_ICACHE_Init();
MX_RTC_Init();
MX_USART3_UART_Init();
MX_DCACHE1_Init();
/* USER CODE BEGIN 2 */
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
unsigned prev_ssr = 0;
unsigned this_ssr, tick, tr, dr;
int count;
char print_buf[32] = { 0 };
while (1) {
/* Unlock write protection */
WRITE_REG(RTC->WPR, 0xCA);
WRITE_REG(RTC->WPR, 0x53);
/* Clear Registers Synchronization Flag(RSF) */
CLEAR_BIT(RTC->ICSR, (1U << 5));
/* Reactivate write protection */
WRITE_REG(RTC->WPR, 0x11);
/* Wait for hardware setting RSF to 1 */
while ((READ_REG(RTC->ICSR) & (1U << 5)) == 0)
;
/* Read all 3 registers. */
this_ssr = READ_REG(RTC->SSR);
tr = READ_REG(RTC->TR);
dr = READ_REG(RTC->DR);
tick = HAL_GetTick();
if (this_ssr != prev_ssr) {
count = sprintf(print_buf, "%05u:%08u\n", this_ssr, tick);
HAL_UART_Transmit(&huart3, (uint8_t const*) print_buf, count, 10);
prev_ssr = this_ssr;
}
/* 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
*/
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE0);
while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}
/** Configure LSE Drive Capability
*/
HAL_PWR_EnableBkUpAccess();
__HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE|RCC_OSCILLATORTYPE_CSI;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
RCC_OscInitStruct.CSIState = RCC_CSI_ON;
RCC_OscInitStruct.CSICalibrationValue = RCC_CSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLL1_SOURCE_CSI;
RCC_OscInitStruct.PLL.PLLM = 1;
RCC_OscInitStruct.PLL.PLLN = 125;
RCC_OscInitStruct.PLL.PLLP = 2;
RCC_OscInitStruct.PLL.PLLQ = 2;
RCC_OscInitStruct.PLL.PLLR = 2;
RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1_VCIRANGE_2;
RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1_VCORANGE_WIDE;
RCC_OscInitStruct.PLL.PLLFRACN = 0;
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_PLLCLK;
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_5) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief DCACHE1 Initialization Function
* @param None
* @retval None
*/
static void MX_DCACHE1_Init(void)
{
/* USER CODE BEGIN DCACHE1_Init 0 */
/* USER CODE END DCACHE1_Init 0 */
/* USER CODE BEGIN DCACHE1_Init 1 */
/* USER CODE END DCACHE1_Init 1 */
hdcache1.Instance = DCACHE1;
hdcache1.Init.ReadBurstType = DCACHE_READ_BURST_WRAP;
if (HAL_DCACHE_Init(&hdcache1) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN DCACHE1_Init 2 */
/* USER CODE END DCACHE1_Init 2 */
}
/**
* @brief ICACHE Initialization Function
* @param None
* @retval None
*/
static void MX_ICACHE_Init(void)
{
/* USER CODE BEGIN ICACHE_Init 0 */
/* USER CODE END ICACHE_Init 0 */
ICACHE_RegionConfigTypeDef pRegionConfig = {0};
/* USER CODE BEGIN ICACHE_Init 1 */
/* USER CODE END ICACHE_Init 1 */
/** Configure and enable region 0 for memory remapping
*/
pRegionConfig.BaseAddress = 0x10000000;
pRegionConfig.RemapAddress = 0x60000000;
pRegionConfig.Size = ICACHE_REGIONSIZE_2MB;
pRegionConfig.TrafficRoute = ICACHE_MASTER1_PORT;
pRegionConfig.OutputBurstType = ICACHE_OUTPUT_BURST_WRAP;
if (HAL_ICACHE_EnableRemapRegion(_NULL, &pRegionConfig) != HAL_OK)
{
Error_Handler();
}
/** Enable instruction cache in 1-way (direct mapped cache)
*/
if (HAL_ICACHE_ConfigAssociativityMode(ICACHE_1WAY) != HAL_OK)
{
Error_Handler();
}
if (HAL_ICACHE_Enable() != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ICACHE_Init 2 */
/* USER CODE END ICACHE_Init 2 */
}
/**
* @brief RTC Initialization Function
* @param None
* @retval None
*/
static void MX_RTC_Init(void)
{
/* USER CODE BEGIN RTC_Init 0 */
/* USER CODE END RTC_Init 0 */
RTC_PrivilegeStateTypeDef privilegeState = {0};
RTC_TimeTypeDef sTime = {0};
RTC_DateTypeDef sDate = {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 Check_RTC_BKUP */
/* USER CODE END Check_RTC_BKUP */
/** Initialize RTC and set the Time and Date
*/
sTime.Hours = 12;
sTime.Minutes = 34;
sTime.Seconds = 56;
sTime.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
sTime.StoreOperation = RTC_STOREOPERATION_RESET;
if (HAL_RTC_SetTime(&hrtc, &sTime, RTC_FORMAT_BIN) != HAL_OK)
{
Error_Handler();
}
sDate.WeekDay = RTC_WEEKDAY_SUNDAY;
sDate.Month = RTC_MONTH_FEBRUARY;
sDate.Date = 29;
sDate.Year = 24;
if (HAL_RTC_SetDate(&hrtc, &sDate, RTC_FORMAT_BIN) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN RTC_Init 2 */
/* USER CODE END RTC_Init 2 */
}
/**
* @brief USART3 Initialization Function
* @param None
* @retval None
*/
static void MX_USART3_UART_Init(void)
{
/* USER CODE BEGIN USART3_Init 0 */
/* USER CODE END USART3_Init 0 */
/* USER CODE BEGIN USART3_Init 1 */
/* USER CODE END USART3_Init 1 */
huart3.Instance = USART3;
huart3.Init.BaudRate = 115200;
huart3.Init.WordLength = UART_WORDLENGTH_8B;
huart3.Init.StopBits = UART_STOPBITS_1;
huart3.Init.Parity = UART_PARITY_NONE;
huart3.Init.Mode = UART_MODE_TX_RX;
huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart3.Init.OverSampling = UART_OVERSAMPLING_16;
huart3.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
huart3.Init.ClockPrescaler = UART_PRESCALER_DIV1;
huart3.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if (HAL_UART_Init(&huart3) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetTxFifoThreshold(&huart3, UART_TXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_SetRxFifoThreshold(&huart3, UART_RXFIFO_THRESHOLD_1_8) != HAL_OK)
{
Error_Handler();
}
if (HAL_UARTEx_DisableFifoMode(&huart3) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN USART3_Init 2 */
/* USER CODE END USART3_Init 2 */
}
/**
* @brief GPIO Initialization Function
* @param None
* @retval None
*/
static void MX_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* USER CODE BEGIN MX_GPIO_Init_1 */
/* USER CODE END MX_GPIO_Init_1 */
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOC_CLK_ENABLE();
__HAL_RCC_GPIOF_CLK_ENABLE();
__HAL_RCC_GPIOB_CLK_ENABLE();
__HAL_RCC_GPIOD_CLK_ENABLE();
__HAL_RCC_GPIOG_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(YELLOW_GPIO_Port, YELLOW_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(GREEN_GPIO_Port, GREEN_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin Output Level */
HAL_GPIO_WritePin(RED_GPIO_Port, RED_Pin, GPIO_PIN_RESET);
/*Configure GPIO pin : Button_Pin */
GPIO_InitStruct.Pin = Button_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(Button_GPIO_Port, &GPIO_InitStruct);
/*Configure GPIO pin : YELLOW_Pin */
GPIO_InitStruct.Pin = YELLOW_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(YELLOW_GPIO_Port, &GPIO_InitStruct);
/*Configure GPIO pin : GREEN_Pin */
GPIO_InitStruct.Pin = GREEN_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(GREEN_GPIO_Port, &GPIO_InitStruct);
/*Configure GPIO pin : RED_Pin */
GPIO_InitStruct.Pin = RED_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
HAL_GPIO_Init(RED_GPIO_Port, &GPIO_InitStruct);
/* USER CODE BEGIN MX_GPIO_Init_2 */
/* USER CODE END MX_GPIO_Init_2 */
}
/* 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 */
Appreciate for any help.
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