STM32—DMA超详解入门(内存-＞内存、内存-＞外设、外设-＞内存)
目录
一、DMA是什么？
二、DMA的意义
三、DMA搬运数据
1.搬运什么数据
2.从哪里搬到哪里
四、DMA通道
五、DMA处理
六、DMA传输模式
七、指针递增模式
八、DMA中断
九、存储器搬到存储器
1.STM32的hal库关于DMA的函数
2.配置
3.main.c代码
十、存储器搬到外设
1.用到的hal函数
2.配置
3.main.c代码
十一、外设搬到存储器
1.用到的hal函数
2.配置
3.main.c代码
4.stm32f1xx_it.c代码
一、DMA是什么？
DMA(Direct Memory Access，直接存储器访问) 提供在外设与内存、存储器和存储器、外设 与外设之间的高速数据传输使用。它允许不同速度的硬件装置来沟通，而不需要依赖于 CPU，在这个时间中，CPU对于内存的工作来说就无法使用。简单来说就是一个数据搬运工。
二、DMA的意义
代替 CPU 搬运数据，为 CPU 减负。
1. 数据搬运的工作比较耗时间。
2. 数据搬运工作时效要求高（有数据来就要搬走）。
3. 没啥技术含量（CPU 节约出来的时间可以处理更重要的事）。
三、DMA搬运数据
1.搬运什么数据
搬运存储器、外设的数据：
外设指的是spi、usart、iic、adc 等基于APB1 、APB2或AHB时钟的外设。
存储器包括自身的闪存(flash)或者内存(SRAM)以及外设的存储设备都可以作为访问地源或者目的。
2.从哪里搬到哪里
1.存储器→存储器（例如：复制某特别大的数据buf）
2.存储器→外设 （例如：将某数据buf写入串口TDR寄存器）
3.外设→存储器 （例如：将串口RDR寄存器写入某数据buf）
四、DMA通道
STM32F103C8T6芯片有2个DMA控制器，DMA1有7个通道，DMA2有5个通道。一个通道每次只能搬运一个外设的数据！，如果同时有多个外设的 DMA 请求，则按照优先级进行响应。
1.DMA1有7个通道：
2.DMA2有5个通道：
3.通道的优先级：优先级管理采用软件+硬件
软件优先级： 每个通道的优先级可以在DMA_CCRx寄存器中设置，有4个等级：最高级>高级>中级>低级
硬件优先级： 如果2个请求，它们的软件优先级相同，则较低编号的通道比较高编号的通道有较高 的优先权。
比如：如果软件优先级相同，通道2优先于通道4
五、DMA处理
在发生一个事件后，外设向DMA控制器发送一个请求信号。DMA控制器根据通道的优先权处理请求。当DMA控制器开始访问发出请求的外设时，DMA控制器立即发送给它一个应答信号。当从DMA控制器得到应答信号时，外设立即释放它的请求。一旦外设释放了这个请求，DMA控制器同时撤销应答信号。如果有更多的请求时，外设可以启动下一个周期。
DMA传送由3个操作组成:
1.（从旧地点取数据）从外设数据寄存器或者从当前外设/存储器地址寄存器指示的存储器地址取数据，第一次传输时的开始地址是DMA_CPARx或DMA_CMARx寄存器指定的外设基地址或存储器单元。
2.（到新地点存数据）存数据到外设数据寄存器或者当前外设/存储器地址寄存器指示的存储器地址，第一次传输时的开始地址是DMA_CPARx或DMA_CMARx寄存器指定的外设基地址或存储器单元。
3.（操作数递减1次）执行一次DMA_CNDTRx寄存器的递减操作，该寄存器包含未完成的操作数目。
六、DMA传输模式
1.（正常模式）DMA_Mode_Normal一次DMA数据传输完后，停止DMA传送 ，也就是只传输一次。
2.（循环传输模式）DMA_Mode_Circular当传输结束时，硬件自动会将传输数据量寄存器进行重装，进行下一轮的数据传输。 也就是多次传输模式
七、指针递增模式
外设和存储器指针在每次传输后可以自动向后递增或保持常量。当设置为增量模式时，下一个要传输的地址将是前一个地址加上增量值。一般设计存储器的都开启指针增量模式。
1.源指针和目标指针都设置为增量模式
2.源指针设置为增量模式
八、DMA中断
每个DMA通道都有3个事件（DMA半传输、DMA传输完成和DMA传输错误），这3个事件都可以成为一个单独的中断请求。
九、存储器搬到存储器
1.STM32的hal库关于DMA的函数
原型：HAL_StatusTypeDef HAL_DMA_Start(DMA_HandleTypeDef *hdma, uint32_t SrcAddress, uint32_t DstAddress, uint32_t DataLength)
作用：打开DMA然后开始传输数据
四个参数：
DMA_HandleTypeDef *hdma，DMA通道句柄
uint32_t SrcAddress，源数据地址
uint32_t DstAddress，目标内存地址
uint32_t DataLength，传输数据长度。注意：需要乘以sizeof(uint32_t)
返回值：HAL_StatusTypeDef，HAL状态（OK，busy，ERROR，TIMEOUT）
原型：#define __HAL_DMA_GET_FLAG(__HANDLE__, __FLAG__) (DMA1->ISR & (__FLAG__))
作用：获取DMA的FLAG的一些值
二个参数：
HANDLE，DMA通道句柄
FLAG，数据传输标志： x是通道几，通道1就x=1
DMA_FLAG_TCx：传输完成标志
DMA_FLAG_HTx：半传输完成标志
DMA_FLAG_TEx：传输错误标志
DMA_FLAG_GLx：全局中断标志返回值：FLAG的值（SET/RESET）
2.配置
实现目的：把内存里的一个数组的数据搬运的另一个内存的数组，然后用串口把新数组数据发送。
1.DMA配置
2.打开串口USART1、异步、非中断
3.时钟72KHz
3.main.c代码
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2023 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"
#include "dma.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include
#include
//数组大小===========================================================
#define BUF_SIZE 16
/* 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 ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
// 源数组===========================================================
uint32_t srcBuf[BUF_SIZE] = {
0x00000000,0x11111111,0x22222222,0x33333333,
0x44444444,0x55555555,0x66666666,0x77777777,
0x88888888,0x99999999,0xAAAAAAAA,0xBBBBBBBB,
0xCCCCCCCC,0xDDDDDDDD,0xEEEEEEEE,0xFFFFFFFF
};
// 目标数组
uint32_t desBuf[BUF_SIZE];
//重写fputc，利用printf进行串口输出
int fputc(int ch, FILE *f)
{
unsigned char temp[1]={ch};
HAL_UART_Transmit(&huart1,temp,1,0xffff);
return ch;
}
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(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 */
int i = 0;
/* 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_DMA_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
// 开启数据传输============================================================
HAL_DMA_Start(&hdma_memtomem_dma1_channel1,//句柄在dma.c可以查看
(uint32_t)srcBuf, (uint32_t)desBuf, sizeof(uint32_t) * BUF_SIZE);
//16个数每个数都是uint32_t大小
// 等待数据传输完成，完成返回值是SET
while(__HAL_DMA_GET_FLAG(&hdma_memtomem_dma1_channel1, DMA_FLAG_TC1) == RESET);//传输完成标志通道1
// 打印数组内容
for (i = 0; i < BUF_SIZE; i++)//输出数组
printf("Buf[%d] = %X\r\n", i, desBuf[i]);//16进制 %X
/* 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};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
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_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/* 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 */
十、存储器搬到外设
1.用到的hal函数
原型：HAL_StatusTypeDef HAL_UART_Transmit_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size)
作用：把内存里的数据通过串口发送出去
三个参数：
参数一：UART_HandleTypeDef *huart，串口句柄
参数二：uint8_t *pData，待发送数据首地址
参数三：uint16_t Size，待发送数据长度
返回值：HAL_StatusTypeDef，HAL状态（OK，busy，ERROR，TIMEOUT）
2.配置
实现目的：用DMA的方式将内存数据搬运到串口1发送寄存器，同时闪烁LED1。
1.需先打开串口，打开串口1、异步、非中断
2.配置DMA
3.配置灯：GPIO PB8、output输出、开始为高电平灯灭
4.时钟 72KHz
5.芯片对应的串口引脚反接SUB对应的引脚。
3.main.c代码
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2023 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"
#include "dma.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* 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 */
//宏定义数组大小=====================================================================
#define BUF_SIZE 100
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
// 定义待发送的数据数组================================================================
unsigned char sendBuf[BUF_SIZE];
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(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 */
int i = 0;
/* 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_DMA_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
//
// 准备数据================================================================
for (i = 0; i < BUF_SIZE; i++)//往数组添加数据
sendBuf[i] = 'A';
// 将数据通过串口DMA发送
HAL_UART_Transmit_DMA(&huart1, sendBuf, BUF_SIZE);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
//反转GPIO电平，灯闪烁=========================================================
HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_8);//反转GPIO电平
HAL_Delay(100);
/* 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};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
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_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/* 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 */
十一、外设搬到存储器
1.用到的hal函数
1.原型：#define __HAL_UART_ENABLE_IT(__HANDLE__, __INTERRUPT__) ((((__INTERRUPT__) >> 28U) == UART_CR1_REG_INDEX)? ((__HANDLE__)->Instance->CR1 |= ((__INTERRUPT__) & UART_IT_MASK)): \ (((__INTERRUPT__) >> 28U) == UART_CR2_REG_INDEX)? ((__HANDLE__)->Instance->CR2 |= ((__INTERRUPT__) & UART_IT_MASK)): \ ((__HANDLE__)->Instance- >CR3 |= ((__INTERRUPT__) & UART_IT_MASK)))
作用：开启串口需要使能的中断
二个参数：
参数一：HANDLE，串口句柄
参数二：INTERRUPT，需要使能的中断
UART_IT_CTS: CTS change interrupt
UART_IT_LBD: LIN Break detection interrupt
UART_IT_TXE: Transmit Data Register empty interrupt
UART_IT_TC: Transmission complete interrupt
UART_IT_RXNE: Receive Data register not empty interrupt
UART_IT_IDLE: 串口空闲中断
UART_IT_PE: Parity Error interrupt
UART_IT_ERR: Error interrupt(Frame error, noise error, overrun error)返回值：无
2.原型：HAL_StatusTypeDef HAL_UART_Receive_DMA(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t Size)
作用：接收串口数据
三个参数：
参数一：UART_HandleTypeDef *huart，串口句柄
参数二：uint8_t *pData，接收缓存首地址
参数三：uint16_t Size，接收缓存长度
返回值：HAL_StatusTypeDef，HAL状态（OK，busy，ERROR，TIMEOUT）
3.原型：#define __HAL_UART_GET_FLAG(__HANDLE__, __FLAG__) (((__HANDLE__)->Instance->SR & (__FLAG__)) == (__FLAG__))
作用：获取某标志位的值 RESET/SET
二个参数：
参数一：HANDLE，串口句柄
参数二：FLAG
UART_FLAG_CTS: CTS Change flag (not available for UART4 and UART5)
UART_FLAG_LBD: LIN Break detection flag
UART_FLAG_TXE: Transmit data register empty flag
UART_FLAG_TC: Transmission Complete flag
UART_FLAG_RXNE: Receive data register not empty flag
UART_FLAG_IDLE: 串口空闲标志位
UART_FLAG_ORE: Overrun Error flag
UART_FLAG_NE: Noise Error flag
UART_FLAG_FE: Framing Error flag
UART_FLAG_PE: Parity Error flag返回值：FLAG的值，RESET/SET
4.原型：#define __HAL_UART_CLEAR_IDLEFLAG(__HANDLE__) __HAL_UART_CLEAR_PEFLAG(__HANDLE__)
作用：清除 数据传输标志
参数一：HANDLE，串口句柄
返回值：无
5.原型：HAL_StatusTypeDef HAL_UART_DMAStop(UART_HandleTypeDef *huart)
作用：关闭DMA
参数一：UART_HandleTypeDef *huart，串口句柄
返回值：HAL_StatusTypeDef，HAL状态（OK，busy，ERROR，TIMEOUT）
6.原型：#define __HAL_DMA_GET_COUNTER(__HANDLE__) ((__HANDLE__)->Instance->CNDTR)
作用：获取未传输数据的大小
参数一：HANDLE，串口句柄。hdma_usart1_tx发送 / hdma_usart1_rx接收
返回值：未传输数据大小
2.配置
实现目的：使用DMA的方式将串口1接收缓存寄存器的数据搬运到存储器中，再通过串口打印存储器数据，同时每隔0.5s翻转一次LED1的电平。
流程：
（1）设置一个数组用来接收存放外设搬来的数据。
（2）使能IDLE空闲中断，使能DMA接收且中断。
（3）每次串口接收中断，进入中断服务函数，判断是否空闲中断，如空闲中断则表示接收完成。
（4）清除中断标志位，关闭DMA传输（防止干扰）。
（5）计算刚才收到了多少个字节的数据。
（6）输出数组数据。
（7）处理缓冲区数据，开启DMA传输，开始下一帧接收。
1.需先打开串口，打开串口1、异步、中断
2.DMA配置
3.配置灯：GPIO PB8、output输出、开始为高电平灯灭
4.时钟 72KHz
3.main.c代码
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2023 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"
#include "dma.h"
#include "usart.h"
#include "gpio.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* 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 */
//数组大小===========================================================================
#define BUF_SIZE 100
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
//定义数组============================================================================
uint8_t rcvBuf[BUF_SIZE]; // 接收数据缓存数组
uint8_t rcvLen = 0; // 接收一帧数据的长度
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(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_DMA_Init();
MX_USART1_UART_Init();
/* USER CODE BEGIN 2 */
//=================================================================================
__HAL_UART_ENABLE_IT(&huart1, UART_IT_IDLE); // 使能IDLE空闲中断
HAL_UART_Receive_DMA(&huart1,rcvBuf,100); // 使能DMA接收且中断
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
//反转电平，灯闪烁 =========================================================
HAL_GPIO_TogglePin(GPIOB, GPIO_PIN_8);//反转电平，灯闪烁
HAL_Delay(300);
/* 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};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
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_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/* 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 */
4.stm32f1xx_it.c代码
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file stm32f1xx_it.c
* @brief Interrupt Service Routines.
******************************************************************************
* @attention
*
* Copyright (c) 2023 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"
#include "stm32f1xx_it.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN TD */
#define BUF_SIZE 100//===========================================================
extern uint8_t rcvBuf[BUF_SIZE];//extern调用另一个c文件里的变量或者函数
extern uint8_t rcvLen;
/* USER CODE END TD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/* External variables --------------------------------------------------------*/
extern DMA_HandleTypeDef hdma_usart1_tx;
extern DMA_HandleTypeDef hdma_usart1_rx;
extern UART_HandleTypeDef huart1;
/* USER CODE BEGIN EV */
/* USER CODE END EV */
/******************************************************************************/
/* Cortex-M3 Processor Interruption and Exception Handlers */
/******************************************************************************/
/**
* @brief This function handles Non maskable interrupt.
*/
void NMI_Handler(void)
{
/* USER CODE BEGIN NonMaskableInt_IRQn 0 */
/* USER CODE END NonMaskableInt_IRQn 0 */
/* USER CODE BEGIN NonMaskableInt_IRQn 1 */
while (1)
{
}
/* USER CODE END NonMaskableInt_IRQn 1 */
}
/**
* @brief This function handles Hard fault interrupt.
*/
void HardFault_Handler(void)
{
/* USER CODE BEGIN HardFault_IRQn 0 */
/* USER CODE END HardFault_IRQn 0 */
while (1)
{
/* USER CODE BEGIN W1_HardFault_IRQn 0 */
/* USER CODE END W1_HardFault_IRQn 0 */
}
}
/**
* @brief This function handles Memory management fault.
*/
void MemManage_Handler(void)
{
/* USER CODE BEGIN MemoryManagement_IRQn 0 */
/* USER CODE END MemoryManagement_IRQn 0 */
while (1)
{
/* USER CODE BEGIN W1_MemoryManagement_IRQn 0 */
/* USER CODE END W1_MemoryManagement_IRQn 0 */
}
}
/**
* @brief This function handles Prefetch fault, memory access fault.
*/
void BusFault_Handler(void)
{
/* USER CODE BEGIN BusFault_IRQn 0 */
/* USER CODE END BusFault_IRQn 0 */
while (1)
{
/* USER CODE BEGIN W1_BusFault_IRQn 0 */
/* USER CODE END W1_BusFault_IRQn 0 */
}
}
/**
* @brief This function handles Undefined instruction or illegal state.
*/
void UsageFault_Handler(void)
{
/* USER CODE BEGIN UsageFault_IRQn 0 */
/* USER CODE END UsageFault_IRQn 0 */
while (1)
{
/* USER CODE BEGIN W1_UsageFault_IRQn 0 */
/* USER CODE END W1_UsageFault_IRQn 0 */
}
}
/**
* @brief This function handles System service call via SWI instruction.
*/
void SVC_Handler(void)
{
/* USER CODE BEGIN SVCall_IRQn 0 */
/* USER CODE END SVCall_IRQn 0 */
/* USER CODE BEGIN SVCall_IRQn 1 */
/* USER CODE END SVCall_IRQn 1 */
}
/**
* @brief This function handles Debug monitor.
*/
void DebugMon_Handler(void)
{
/* USER CODE BEGIN DebugMonitor_IRQn 0 */
/* USER CODE END DebugMonitor_IRQn 0 */
/* USER CODE BEGIN DebugMonitor_IRQn 1 */
/* USER CODE END DebugMonitor_IRQn 1 */
}
/**
* @brief This function handles Pendable request for system service.
*/
void PendSV_Handler(void)
{
/* USER CODE BEGIN PendSV_IRQn 0 */
/* USER CODE END PendSV_IRQn 0 */
/* USER CODE BEGIN PendSV_IRQn 1 */
/* USER CODE END PendSV_IRQn 1 */
}
/**
* @brief This function handles System tick timer.
*/
void SysTick_Handler(void)
{
/* USER CODE BEGIN SysTick_IRQn 0 */
/* USER CODE END SysTick_IRQn 0 */
HAL_IncTick();
/* USER CODE BEGIN SysTick_IRQn 1 */
/* USER CODE END SysTick_IRQn 1 */
}
/******************************************************************************/
/* STM32F1xx Peripheral Interrupt Handlers */
/* Add here the Interrupt Handlers for the used peripherals. */
/* For the available peripheral interrupt handler names, */
/* please refer to the startup file (startup_stm32f1xx.s). */
/******************************************************************************/
/**
* @brief This function handles DMA1 channel4 global interrupt.
*/
void DMA1_Channel4_IRQHandler(void)
{
/* USER CODE BEGIN DMA1_Channel4_IRQn 0 */
/* USER CODE END DMA1_Channel4_IRQn 0 */
HAL_DMA_IRQHandler(&hdma_usart1_tx);
/* USER CODE BEGIN DMA1_Channel4_IRQn 1 */
/* USER CODE END DMA1_Channel4_IRQn 1 */
}
/**
* @brief This function handles DMA1 channel5 global interrupt.
*/
void DMA1_Channel5_IRQHandler(void)
{
/* USER CODE BEGIN DMA1_Channel5_IRQn 0 */
/* USER CODE END DMA1_Channel5_IRQn 0 */
HAL_DMA_IRQHandler(&hdma_usart1_rx);
/* USER CODE BEGIN DMA1_Channel5_IRQn 1 */
/* USER CODE END DMA1_Channel5_IRQn 1 */
}
/**
* @brief This function handles USART1 global interrupt.
*/
void USART1_IRQHandler(void)
{
/* USER CODE BEGIN USART1_IRQn 0 */
/* USER CODE END USART1_IRQn 0 */
HAL_UART_IRQHandler(&huart1);
/* USER CODE BEGIN USART1_IRQn 1 */
// 判断空闲中断IDLE标志位是否被置位，被置位则空闲=====================================
if((__HAL_UART_GET_FLAG(&huart1,UART_FLAG_IDLE) == SET))
{
__HAL_UART_CLEAR_IDLEFLAG(&huart1);// 清除IDLE标志位
HAL_UART_DMAStop(&huart1); // 停止DMA传输，防止干扰
uint8_t temp=__HAL_DMA_GET_COUNTER(&hdma_usart1_rx);//未传输数据的大小
rcvLen = BUF_SIZE - temp; //计算数据长度
HAL_UART_Transmit_DMA(&huart1, rcvBuf, rcvLen);//串口发送数据
HAL_UART_Receive_DMA(&huart1, rcvBuf, BUF_SIZE);//开启DMA，等待下一次接收
}
/* USER CODE END USART1_IRQn 1 */
}
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */