一个严谨的STM32串口DMA发送&接收（1.5Mbps波特率）机制

只看该作者 · 2021-7-7 10:23

8 完整源码

串口&DMA底层配置：

#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include "stm32f0xx.h"
#include "bsp_uart.h"

/**
* @brief
* @param
* @retval
*/
static void bsp_uart1_gpio_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
#if 0
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_0);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_0);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed    = GPIO_Speed_Level_3;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOB, &GPIO_InitStructure);
#else
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

GPIO_PinAFConfig(GPIOB, GPIO_PinSource9, GPIO_AF_1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_1);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed    = GPIO_Speed_Level_3;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
#endif
}

只看该作者 · 2021-7-7 10:24

/**
* @brief
* @param
* @retval
*/
static void bsp_uart2_gpio_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);

GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_1);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_InitStructure.GPIO_PuPd  = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}

只看该作者 · 2021-7-7 10:25

/**
* @brief
* @param
* @retval
*/
void bsp_uart1_init(void)
{
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

bsp_uart1_gpio_init();

/* 使能串口和DMA时钟 */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

USART_InitStructure.USART_BaudRate          = 57600;
USART_InitStructure.USART_WordLength       = USART_WordLength_8b;
USART_InitStructure.USART_StopBits          = USART_StopBits_1;
USART_InitStructure.USART_Parity             = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode             = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);

USART_ITConfig(USART1, USART_IT_IDLE, ENABLE); /* 使能空闲中断 */
USART_OverrunDetectionConfig(USART1, USART_OVRDetection_Disable);

USART_Cmd(USART1, ENABLE);
USART_DMACmd(USART1, USART_DMAReq_Rx|USART_DMAReq_Tx, ENABLE); /* 使能DMA收发 */

/* 串口中断 */
NVIC_InitStructure.NVIC_IRQChannel       = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd    = ENABLE;
NVIC_Init(&NVIC_InitStructure);

/* DMA中断 */
    NVIC_InitStructure.NVIC_IRQChannel    = DMA1_Channel2_3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd    = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

只看该作者 · 2021-7-7 10:26

/**
* @brief
* @param
* @retval
*/
void bsp_uart2_init(void)
{
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

bsp_uart2_gpio_init();

/* 使能串口和DMA时钟 */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE);

USART_InitStructure.USART_BaudRate          = 57600;
USART_InitStructure.USART_WordLength       = USART_WordLength_8b;
USART_InitStructure.USART_StopBits          = USART_StopBits_1;
USART_InitStructure.USART_Parity             = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode             = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART2, &USART_InitStructure);

USART_ITConfig(USART2, USART_IT_IDLE, ENABLE); /* 使能空闲中断 */
USART_OverrunDetectionConfig(USART2, USART_OVRDetection_Disable);

USART_Cmd(USART2, ENABLE);
USART_DMACmd(USART2, USART_DMAReq_Rx|USART_DMAReq_Tx, ENABLE); /* 使能DMA收发 */

/* 串口中断 */
NVIC_InitStructure.NVIC_IRQChannel       = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd    = ENABLE;
NVIC_Init(&NVIC_InitStructure);

/* DMA中断 */
NVIC_InitStructure.NVIC_IRQChannel       = DMA1_Channel4_5_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd    = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

只看该作者 · 2021-7-7 10:27

void bsp_uart1_dmatx_config(uint8_t *mem_addr, uint32_t mem_size)
{
DMA_InitTypeDef DMA_InitStructure;

DMA_DeInit(DMA1_Channel2);
DMA_Cmd(DMA1_Channel2, DISABLE);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(USART1->TDR);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)mem_addr;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; /* 传输方向:内存->外设 */
DMA_InitStructure.DMA_BufferSize = mem_size;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel2, &DMA_InitStructure);
DMA_ITConfig(DMA1_Channel2, DMA_IT_TC|DMA_IT_TE, ENABLE);
DMA_ClearFlag(DMA1_IT_TC2); /* 清除发送完成标识 */
DMA_Cmd(DMA1_Channel2, ENABLE);
}

只看该作者 · 2021-7-7 10:27

void bsp_uart1_dmarx_config(uint8_t *mem_addr, uint32_t mem_size)
{
DMA_InitTypeDef DMA_InitStructure;

DMA_DeInit(DMA1_Channel3);
DMA_Cmd(DMA1_Channel3, DISABLE);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(USART1->RDR);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)mem_addr;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; /* 传输方向:外设->内存 */
DMA_InitStructure.DMA_BufferSize = mem_size;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel3, &DMA_InitStructure);
DMA_ITConfig(DMA1_Channel3, DMA_IT_TC|DMA_IT_HT|DMA_IT_TE, ENABLE);/* 使能DMA半满、全满、错误中断 */
DMA_ClearFlag(DMA1_IT_TC3);
DMA_ClearFlag(DMA1_IT_HT3);
DMA_Cmd(DMA1_Channel3, ENABLE);
}

只看该作者 · 2021-7-7 10:28

uint16_t bsp_uart1_get_dmarx_buf_remain_size(void)
{
return DMA_GetCurrDataCounter(DMA1_Channel3); /* 获取DMA接收buf剩余空间 */
}

void bsp_uart2_dmatx_config(uint8_t *mem_addr, uint32_t mem_size)
{
DMA_InitTypeDef DMA_InitStructure;

DMA_DeInit(DMA1_Channel4);
DMA_Cmd(DMA1_Channel4, DISABLE);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(USART2->TDR);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)mem_addr;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; /* 传输方向:内存->外设 */
DMA_InitStructure.DMA_BufferSize = mem_size;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel4, &DMA_InitStructure);
DMA_ITConfig(DMA1_Channel4, DMA_IT_TC|DMA_IT_TE, ENABLE);
DMA_ClearFlag(DMA1_IT_TC4); /* 清除发送完成标识 */
DMA_Cmd(DMA1_Channel4, ENABLE);
}

只看该作者 · 2021-7-7 10:29

void bsp_uart2_dmarx_config(uint8_t *mem_addr, uint32_t mem_size)
{
DMA_InitTypeDef DMA_InitStructure;

DMA_DeInit(DMA1_Channel5);
DMA_Cmd(DMA1_Channel5, DISABLE);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(USART2->RDR);
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)mem_addr;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; /* 传输方向:外设->内存 */
DMA_InitStructure.DMA_BufferSize = mem_size;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel5, &DMA_InitStructure);
DMA_ITConfig(DMA1_Channel5, DMA_IT_TC|DMA_IT_HT|DMA_IT_TE, ENABLE);/* 使能DMA半满、全满、错误中断 */
DMA_ClearFlag(DMA1_IT_TC5);
DMA_ClearFlag(DMA1_IT_HT5);
DMA_Cmd(DMA1_Channel5, ENABLE);
}

uint16_t bsp_uart2_get_dmarx_buf_remain_size(void)
{
return DMA_GetCurrDataCounter(DMA1_Channel5); /* 获取DMA接收buf剩余空间 */
}