stm32dma串口数据收发HAL库
时间: 2023-09-11 14:12:02 浏览: 131
STM32F407、405标准库串口数据收发-DMA
在STM32 HAL库中,使用DMA实现串口数据收发也是非常简单的,只需调用相应的HAL库函数即可。以下是一个基本的示例:
```c
#include "stm32f10x.h"
#include "stm32f10x_hal.h"
#define USART_RX_BUFFER_SIZE 256
volatile uint8_t usart_rx_buffer[USART_RX_BUFFER_SIZE];
volatile uint16_t usart_rx_write_index = 0;
volatile uint16_t usart_rx_read_index = 0;
UART_HandleTypeDef huart1;
void usart_init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_USART1_CLK_ENABLE();
__HAL_RCC_DMA1_CLK_ENABLE();
GPIO_InitStruct.Pin = GPIO_PIN_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
GPIO_InitStruct.Pin = GPIO_PIN_10;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
huart1.Instance = USART1;
huart1.Init.BaudRate = 115200;
huart1.Init.WordLength = UART_WORDLENGTH_8B;
huart1.Init.StopBits = UART_STOPBITS_1;
huart1.Init.Parity = UART_PARITY_NONE;
huart1.Init.Mode = UART_MODE_TX_RX;
huart1.Init.HwFlowCtl = UART_HWCONTROL_NONE;
HAL_UART_Init(&huart1);
HAL_NVIC_SetPriority(DMA1_Channel5_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(DMA1_Channel5_IRQn);
HAL_UART_Receive_DMA(&huart1, (uint8_t*)usart_rx_buffer, USART_RX_BUFFER_SIZE);
}
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
usart_rx_write_index = USART_RX_BUFFER_SIZE - huart->hdmarx->Instance->CNDTR;
while (usart_rx_read_index != usart_rx_write_index) {
uint8_t data = usart_rx_buffer[usart_rx_read_index];
usart_rx_read_index = (usart_rx_read_index + 1) % USART_RX_BUFFER_SIZE;
// 处理接收到的数据
// ...
if (usart_rx_read_index == usart_rx_write_index) {
break;
}
}
HAL_UART_Receive_DMA(&huart1, (uint8_t*)usart_rx_buffer, USART_RX_BUFFER_SIZE);
}
int main(void)
{
usart_init();
while (1) {
// 主循环中不需要处理接收到的数据
}
}
void DMA1_Channel5_IRQHandler(void)
{
HAL_DMA_IRQHandler(huart1.hdmarx);
}
```
在上述代码中,我们使用了HAL库函数 `HAL_UART_Receive_DMA` 来启动USART1的DMA接收,同时使用了HAL库函数 `HAL_UART_RxCpltCallback` 来处理接收到的数据。需要注意的是,我们需要在 `HAL_UART_RxCpltCallback` 中再次调用 `HAL_UART_Receive_DMA` 来启动下一轮DMA接收。
此外,在HAL库中,我们也需要在主函数中调用 `HAL_NVIC_EnableIRQ` 函数来使能DMA中断,并且需要在中断处理函数中调用 `HAL_DMA_IRQHandler` 函数来处理DMA中断。
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