空閑中斷+DMA接收數據

使用LL庫配置，可與HAL庫一起使用，0級優化編譯文件大小如下：

1.工程目錄

2.代碼配置

usart1.h

主要定義接收緩存，發送緩存，處理緩存大小

#ifndef _USART1_H #define _USART1_H#include "stm32h7xx.h"#define USART1_TX_BUFFER_SIZE (1 * 1024) #define USART1_RX_BUFFER_SIZE (1 * 1024) #define USART1_RX_HANDLE_SIZE (1 * 1024)extern uint8_t USART1_TX_BUFFER[USART1_TX_BUFFER_SIZE]; extern uint8_t USART1_RX_BUFFER[USART1_RX_BUFFER_SIZE]; extern uint8_t USART1_RX_HANDLE[USART1_RX_HANDLE_SIZE];extern uint32_t USART_RX_CNT; //接收的字節數void IAP_USART1_Init(void);void DMA_START(DMA_TypeDef *DMAx, uint32_t Stream, uint32_t *SRC_ADDR, uint32_t *DES_ADDR, uint32_t Data_Len, uint32_t Direction);#endif

usart1.c

DMA1的USART1 TX RX都配置好了，但是一般不需要，所以雖然配置了但未使用

#include "usart1.h" #include "string.h" #include "stm32h7xx_ll_utils.h" #include "stm32h7xx_ll_dma.h" #include "stm32h7xx_ll_usart.h" #include "stm32h7xx_ll_gpio.h"uint8_t USART1_TX_BUFFER[USART1_TX_BUFFER_SIZE] = {0}; uint8_t USART1_RX_BUFFER[USART1_RX_BUFFER_SIZE] = {0}; uint8_t USART1_RX_HANDLE[USART1_RX_HANDLE_SIZE] = {0};uint32_t USART_RX_CNT = 0; //接收的字節數/*** @brief 配置USART1串口.*/ void USART1_UART_Init(void) {LL_USART_InitTypeDef USART_InitStruct = {0};LL_GPIO_InitTypeDef GPIO_InitStruct = {0};//開啟外設 USART1 時鐘LL_APB2_GRP1_EnableClock(LL_APB2_GRP1_PERIPH_USART1);//開啟 GPIOA 時鐘LL_AHB4_GRP1_EnableClock(LL_AHB4_GRP1_PERIPH_GPIOA);//USART1 GPIO Configuration //PA9 ------> USART1_TX//PA10 ------> USART1_RX GPIO_InitStruct.Pin = LL_GPIO_PIN_9|LL_GPIO_PIN_10;GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;GPIO_InitStruct.Alternate = LL_GPIO_AF_7;//初始化 PA9 PA10LL_GPIO_Init(GPIOA, &GPIO_InitStruct);USART_InitStruct.PrescalerValue = LL_USART_PRESCALER_DIV1; //時鐘不分頻USART_InitStruct.BaudRate = 512000; //波特率512000USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B; //數據寬度8位USART_InitStruct.StopBits = LL_USART_STOPBITS_1; //一個停止位USART_InitStruct.Parity = LL_USART_PARITY_NONE; //無奇偶校驗USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX_RX; //開啟TX RXUSART_InitStruct.HardwareFlowControl = LL_USART_HWCONTROL_NONE; //無硬件流控制USART_InitStruct.OverSampling = LL_USART_OVERSAMPLING_16; //16倍過采樣//初始化 USART1LL_USART_Init(USART1, &USART_InitStruct);LL_USART_SetTXFIFOThreshold(USART1, LL_USART_FIFOTHRESHOLD_1_8);//1/8 FIFOLL_USART_SetRXFIFOThreshold(USART1, LL_USART_FIFOTHRESHOLD_1_8);//LL_USART_EnableFIFO(USART1);LL_USART_DisableFIFO(USART1); //不使用 FIFOLL_USART_ConfigAsyncMode(USART1); //異步模式//使能 USART1LL_USART_Enable(USART1);LL_USART_ClearFlag_TC(USART1);/* USART1 interrupt Init */NVIC_SetPriority(USART1_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(), 0, 0));//優先級分組4，搶占優先級0，響應優先級0//LL_USART_EnableIT_TC(USART1); //開啟發送完成中斷//LL_USART_EnableIT_RXNE_RXFNE(USART1); //開啟接收中斷LL_USART_EnableIT_IDLE(USART1); //開啟空閑中斷NVIC_EnableIRQ(USART1_IRQn);/* Polling USART1 initialisation */while((!(LL_USART_IsActiveFlag_TEACK(USART1))) || (!(LL_USART_IsActiveFlag_REACK(USART1)))){} }/*** @brief 配置USART1 DMA.*/ void USART1_DMA_Init(void) {LL_DMA_InitTypeDef DMA_Init_Struct;//開啟DMA1時鐘LL_AHB1_GRP1_EnableClock(LL_AHB1_GRP1_PERIPH_DMA1);//DMA1 STREAM_0 ------- USART1_TX//DMA1 STREAM_1 ------- USART1_RX/* //USART1 TX DMA配置DMA_Init_Struct.PeriphRequest = LL_DMAMUX1_REQ_USART1_TX; //USART1 TX請求DMA_Init_Struct.Direction = LL_DMA_DIRECTION_MEMORY_TO_PERIPH;//傳輸方向：內存到外設DMA_Init_Struct.PeriphOrM2MSrcAddress = (uint32_t)&USART1->TDR; //外設地址DMA_Init_Struct.PeriphOrM2MSrcDataSize = LL_DMA_PDATAALIGN_BYTE; //外設數據對齊寬度：字節DMA_Init_Struct.PeriphOrM2MSrcIncMode = LL_DMA_PERIPH_NOINCREMENT; //外設地址不自增DMA_Init_Struct.MemoryOrM2MDstAddress = (uint32_t) USART1_TX_BUFFER; //內存地址DMA_Init_Struct.MemoryOrM2MDstDataSize = LL_DMA_MDATAALIGN_BYTE; //內存數據對齊寬度：字節DMA_Init_Struct.MemoryOrM2MDstIncMode = LL_DMA_MEMORY_INCREMENT; //內存地址自增DMA_Init_Struct.NbData = USART1_TX_BUFFER_SIZE; //傳輸數據數量DMA_Init_Struct.Mode = LL_DMA_MODE_NORMAL; //普通模式DMA_Init_Struct.Priority = LL_DMA_PRIORITY_HIGH; //優先級高DMA_Init_Struct.FIFOMode = LL_DMA_FIFOMODE_DISABLE; //關閉FIFODMA_Init_Struct.FIFOThreshold = LL_DMA_FIFOTHRESHOLD_FULL;DMA_Init_Struct.MemBurst = LL_DMA_MBURST_SINGLE; //內存單次突發傳輸DMA_Init_Struct.PeriphBurst = LL_DMA_PBURST_SINGLE; //外設單次突發傳輸LL_DMA_Init(DMA1, LL_DMA_STREAM_0, &DMA_Init_Struct);LL_DMA_ClearFlag_TC0(DMA1);//LL_DMA_EnableIT_TC(DMA1, LL_DMA_STREAM_0);LL_DMA_DisableStream(DMA1, LL_DMA_STREAM_0); */ //USART1 RX DMA配置DMA_Init_Struct.PeriphRequest = LL_DMAMUX1_REQ_USART1_RX; //USART1 RX請求DMA_Init_Struct.Direction = LL_DMA_DIRECTION_PERIPH_TO_MEMORY;//傳輸方向：外設到內存DMA_Init_Struct.PeriphOrM2MSrcAddress = (uint32_t)&USART1->RDR; //外設地址DMA_Init_Struct.PeriphOrM2MSrcDataSize = LL_DMA_PDATAALIGN_BYTE; //外設數據對齊寬度：字節DMA_Init_Struct.PeriphOrM2MSrcIncMode = LL_DMA_PERIPH_NOINCREMENT; //外設地址不自增DMA_Init_Struct.MemoryOrM2MDstAddress = (uint32_t) USART1_RX_BUFFER; //內存地址DMA_Init_Struct.MemoryOrM2MDstDataSize = LL_DMA_MDATAALIGN_BYTE; //內存數據對齊寬度：字節DMA_Init_Struct.MemoryOrM2MDstIncMode = LL_DMA_MEMORY_INCREMENT; //內存地址自增DMA_Init_Struct.NbData = USART1_RX_BUFFER_SIZE; //傳輸數據數量DMA_Init_Struct.Mode = LL_DMA_MODE_NORMAL; //普通模式DMA_Init_Struct.Priority = LL_DMA_PRIORITY_HIGH; //優先級高DMA_Init_Struct.FIFOMode = LL_DMA_FIFOMODE_DISABLE; //關閉FIFODMA_Init_Struct.FIFOThreshold = LL_DMA_FIFOTHRESHOLD_FULL;DMA_Init_Struct.MemBurst = LL_DMA_MBURST_SINGLE; //內存單次突發傳輸DMA_Init_Struct.PeriphBurst = LL_DMA_PBURST_SINGLE; //外設單次突發傳輸LL_DMA_Init(DMA1, LL_DMA_STREAM_1, &DMA_Init_Struct);LL_DMA_ClearFlag_TC1(DMA1);LL_DMA_EnableIT_TC(DMA1, LL_DMA_STREAM_1);LL_DMA_DisableStream(DMA1, LL_DMA_STREAM_1);/* DMA interrupt init *//* DMA1_Stream0_IRQn interrupt configuration */ // NVIC_SetPriority(DMA1_Stream0_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0)); // NVIC_EnableIRQ(DMA1_Stream0_IRQn);/* DMA1_Stream1_IRQn interrupt configuration */NVIC_SetPriority(DMA1_Stream1_IRQn, NVIC_EncodePriority(NVIC_GetPriorityGrouping(),0, 0));NVIC_EnableIRQ(DMA1_Stream1_IRQn); }/*** @brief 配置 USART1 功能.*/ void IAP_USART1_Init(void) {USART1_UART_Init();USART1_DMA_Init();//使能DMA請求//LL_USART_EnableDMAReq_TX(USART1);LL_USART_EnableDMAReq_RX(USART1); }/*** @brief This function handles USART1 global interrupt.*/ void USART1_IRQHandler(void) {uint32_t RX_DATA_LEN = 0;// if(LL_USART_IsActiveFlag_TC(USART1) != RESET)//發送完成中斷 // { // LL_USART_ClearFlag_TC(USART1); // } // if(LL_USART_IsActiveFlag_RXNE_RXFNE(USART1) != RESET)//接收中斷 // { // USART1_RX_BUFFER[0] = (uint8_t)USART1->RDR; // // }if(LL_USART_IsActiveFlag_IDLE(USART1) != RESET)//空閑中斷{LL_DMA_DisableStream(DMA1, LL_DMA_STREAM_1);//關閉DMALL_USART_ClearFlag_IDLE(USART1);LL_DMA_ClearFlag_TC1(DMA1);//計算DMA傳輸字節數, 最大字節數 USART1_RX_BUFFER_SIZERX_DATA_LEN = USART1_RX_BUFFER_SIZE - LL_DMA_GetDataLength(DMA1, LL_DMA_STREAM_1);//如果緩存未滿if((USART_RX_CNT + RX_DATA_LEN) < USART1_RX_HANDLE_SIZE){//復制數據到處理緩存memcpy(USART1_RX_HANDLE, USART1_RX_BUFFER, RX_DATA_LEN);USART_RX_CNT = RX_DATA_LEN;}//再次開啟DMA接收DMA_START(DMA1, LL_DMA_STREAM_1, (uint32_t *)&USART1->RDR , (uint32_t *)USART1_RX_BUFFER, USART1_RX_BUFFER_SIZE, LL_DMA_DIRECTION_PERIPH_TO_MEMORY);} }void DMA_START(DMA_TypeDef *DMAx, uint32_t Stream, uint32_t *SRC_ADDR, uint32_t *DES_ADDR, uint32_t Data_Len, uint32_t Direction) {//LL_DMA_DisableStream(DMAx, Stream);//DMAx->LIFCR = 0x00000F40U;LL_DMA_ConfigAddresses(DMAx, Stream, (uint32_t)SRC_ADDR, (uint32_t)DES_ADDR, Direction);LL_DMA_SetDataLength(DMAx, Stream, Data_Len);LL_DMA_EnableStream(DMAx, Stream);//LL_DMA_EnableBufferableTransfer(DMAx, Stream); }/*** @brief This function handles DMA1 stream0 global interrupt.*/ void DMA1_Stream0_IRQHandler(void) {if(LL_DMA_IsActiveFlag_TC0(DMA1) != RESET)//DMA1_Stream0 傳輸完成中斷，USART1_TX{LL_DMA_DisableStream(DMA1, LL_DMA_STREAM_0);//關閉DMALL_DMA_ClearFlag_TC0(DMA1);} }/*** @brief This function handles DMA1 stream1 global interrupt.*/ void DMA1_Stream1_IRQHandler(void) {if(LL_DMA_IsActiveFlag_TC1(DMA1) != RESET)//DMA1_Stream1 傳輸完成中斷, USART1_RX{LL_DMA_DisableStream(DMA1, LL_DMA_STREAM_1);//關閉DMALL_DMA_ClearFlag_TC1(DMA1);} }

main.h

/* USER CODE BEGIN Header */ /********************************************************************************* @file : main.h* @brief : Header for main.c file.* This file contains the common defines of the application.******************************************************************************* @attention** <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.* All rights reserved.</center></h2>** This software component is licensed by ST under BSD 3-Clause license,* the "License"; You may not use this file except in compliance with the* License. You may obtain a copy of the License at:* opensource.org/licenses/BSD-3-Clause********************************************************************************/ /* USER CODE END Header *//* Define to prevent recursive inclusion -------------------------------------*/ #ifndef __MAIN_H #define __MAIN_H#ifdef __cplusplus extern "C" { #endif/* Includes ------------------------------------------------------------------*/ #include "stm32h7xx_ll_dma.h" #include "stm32h7xx_ll_rcc.h" #include "stm32h7xx_ll_crs.h" #include "stm32h7xx_ll_bus.h" #include "stm32h7xx_ll_system.h" #include "stm32h7xx_ll_exti.h" #include "stm32h7xx_ll_cortex.h" #include "stm32h7xx_ll_utils.h" #include "stm32h7xx_ll_pwr.h" #include "stm32h7xx_ll_usart.h" #include "stm32h7xx.h" #include "stm32h7xx_ll_gpio.h"#if defined(USE_FULL_ASSERT) #include "stm32_assert.h" #endif /* USE_FULL_ASSERT *//* Private includes ----------------------------------------------------------*/ /* USER CODE BEGIN Includes *//* USER CODE END Includes *//* Exported types ------------------------------------------------------------*/ /* USER CODE BEGIN ET *//* USER CODE END ET *//* Exported constants --------------------------------------------------------*/ /* USER CODE BEGIN EC *//* USER CODE END EC *//* Exported macro ------------------------------------------------------------*/ /* USER CODE BEGIN EM *//* USER CODE END EM *//* Exported functions prototypes ---------------------------------------------*/ void SystemClock_Config(void); void Error_Handler(void);/* USER CODE BEGIN EFP *//* USER CODE END EFP *//* Private defines -----------------------------------------------------------*/ #ifndef NVIC_PRIORITYGROUP_0 #define NVIC_PRIORITYGROUP_0 ((uint32_t)0x00000007) /*!< 0 bit for pre-emption priority,4 bits for subpriority */ #define NVIC_PRIORITYGROUP_1 ((uint32_t)0x00000006) /*!< 1 bit for pre-emption priority,3 bits for subpriority */ #define NVIC_PRIORITYGROUP_2 ((uint32_t)0x00000005) /*!< 2 bits for pre-emption priority,2 bits for subpriority */ #define NVIC_PRIORITYGROUP_3 ((uint32_t)0x00000004) /*!< 3 bits for pre-emption priority,1 bit for subpriority */ #define NVIC_PRIORITYGROUP_4 ((uint32_t)0x00000003) /*!< 4 bits for pre-emption priority,0 bit for subpriority */ #endif /* USER CODE BEGIN Private defines *//* USER CODE END Private defines */#ifdef __cplusplus } #endif#endif /* __MAIN_H *//************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

main.c

不斷查詢是否接收到數據，如果接收到數據，發送接收的數據

/* USER CODE BEGIN Header */ /********************************************************************************* @file : main.c* @brief : Main program body******************************************************************************* @attention** <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.* All rights reserved.</center></h2>** This software component is licensed by ST under BSD 3-Clause license,* the "License"; You may not use this file except in compliance with the* License. You may obtain a copy of the License at:* opensource.org/licenses/BSD-3-Clause********************************************************************************/ /* USER CODE END Header *//* Includes ------------------------------------------------------------------*/ #include "main.h" #include "usart1.h"/*** @brief The application entry point.* @retval int*/ int main(void) {LL_APB4_GRP1_EnableClock(LL_APB4_GRP1_PERIPH_SYSCFG);NVIC_SetPriorityGrouping(NVIC_PRIORITYGROUP_4);//組4:4位搶占優先級,0位響應優先級SystemClock_Config();IAP_USART1_Init();while (1){if(USART_RX_CNT)//接收到數據{for(uint32_t count = 0; count < USART_RX_CNT; count ++){//等待發送寄存器為空while(LL_USART_IsActiveFlag_TXE_TXFNF(USART1) == RESET);//填入數據LL_USART_TransmitData8(USART1, USART1_RX_HANDLE[count]);}//清空接收數據數USART_RX_CNT = 0;}else{//LL_mDelay(100);}} }/*** @brief System Clock Configuration* @retval None*/ void SystemClock_Config(void) {LL_FLASH_SetLatency(LL_FLASH_LATENCY_2);if(LL_FLASH_GetLatency() != LL_FLASH_LATENCY_2){Error_Handler(); }LL_PWR_ConfigSupply(LL_PWR_LDO_SUPPLY);LL_PWR_SetRegulVoltageScaling(LL_PWR_REGU_VOLTAGE_SCALE1);LL_RCC_HSI_Enable();/* Wait till HSI is ready */while(LL_RCC_HSI_IsReady() != 1){}LL_RCC_HSI_SetCalibTrimming(32);LL_RCC_HSI_SetDivider(LL_RCC_HSI_DIV1);LL_RCC_PLL_SetSource(LL_RCC_PLLSOURCE_HSI);LL_RCC_PLL1P_Enable();LL_RCC_PLL1_SetVCOInputRange(LL_RCC_PLLINPUTRANGE_2_4);LL_RCC_PLL1_SetVCOOutputRange(LL_RCC_PLLVCORANGE_WIDE);LL_RCC_PLL1_SetM(32);LL_RCC_PLL1_SetN(400);LL_RCC_PLL1_SetP(2);LL_RCC_PLL1_SetQ(2);LL_RCC_PLL1_SetR(2);LL_RCC_PLL1_Enable();/* Wait till PLL is ready */while(LL_RCC_PLL1_IsReady() != 1){};/* Intermediate AHB prescaler 2 when target frequency clock is higher than 80 MHz */LL_RCC_SetAHBPrescaler(LL_RCC_AHB_DIV_2);LL_RCC_SetSysClkSource(LL_RCC_SYS_CLKSOURCE_PLL1);LL_RCC_SetSysPrescaler(LL_RCC_SYSCLK_DIV_1);LL_RCC_SetAHBPrescaler(LL_RCC_AHB_DIV_2);LL_RCC_SetAPB1Prescaler(LL_RCC_APB1_DIV_2);LL_RCC_SetAPB2Prescaler(LL_RCC_APB2_DIV_2);LL_RCC_SetAPB3Prescaler(LL_RCC_APB3_DIV_2);LL_RCC_SetAPB4Prescaler(LL_RCC_APB4_DIV_2);LL_Init1msTick(400000000);LL_SetSystemCoreClock(400000000);LL_RCC_SetUSARTClockSource(LL_RCC_USART16_CLKSOURCE_PCLK2); }/* 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 *//* 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,tex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) *//* USER CODE END 6 */ } #endif /* USE_FULL_ASSERT *//************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

3.運行結果

4.參考鏈接

鏈接: STM32之串口DMA接收不定長數據.

總結

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