xmshao 发表于 2024-3-5 11:15 你可以这样，弄个基于子秒级的alarm中断，比方就比较1位， 感谢你的关注！ 使用中断方式试了一下，数据还是乱的。见下方实例数据，左侧是 SSR 值，右侧是 SysTick 计数。 00243:00000152 00241:00000159 00239:00000167 00237:00000175 00239:00000183 00233:00000191 00231:00000198 可以看出，正常情况下，大概7、8个SysTick（也就是7、8ms）变化一次。 本来应该紧跟在237后的235没有出现，而是回跳到了239，之后有恢复正常。 如果直接读取 SSR 值的话，数据应该是这样的： 00237:...... 00236:...... 00239:...... 00235:...... 00234:...... 话说回来，就算使用中断方式数据会有序起来，也很难满足我的需要。 因为我需要更高精度的时钟，要把 SSR 的分频设为最大的32767，而不是默认的 255。 这样的话，使用中断方式会需要很大的中断开销：大概60微秒就要处理一次中断。这不是我所希望的。 下面是主程序代码： /* 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 */ volatile uint32_t ssr = 0; volatile uint32_t tr = 0; volatile uint32_t dr = 0; /* 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; int count; char print_buf[32] = { 0 }; while (1) { this_ssr = ssr; tr = tr; dr = 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}; RTC_AlarmTypeDef sAlarm = {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(); } /** Enable the Alarm A */ sAlarm.AlarmTime.Hours = 0; sAlarm.AlarmTime.Minutes = 0; sAlarm.AlarmTime.Seconds = 0; sAlarm.AlarmTime.SubSeconds = 1; sAlarm.AlarmMask = RTC_ALARMMASK_ALL; sAlarm.AlarmSubSecondMask = RTC_ALARMSUBSECONDMASK_SS14_1; sAlarm.AlarmDateWeekDaySel = RTC_ALARMDATEWEEKDAYSEL_DATE; sAlarm.AlarmDateWeekDay = 5; sAlarm.Alarm = RTC_ALARM_A; sAlarm.FlagAutoClr = ALARM_FLAG_AUTOCLR_ENABLE; if (HAL_RTC_SetAlarm_IT(&hrtc, &sAlarm, 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 */ void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc) { ssr = READ_REG(RTC->SSR); tr = READ_REG(RTC->TR); dr = READ_REG(RTC->DR); } /* 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 */ 复制代码
