请使用标准库函数并且使用中断处理函数实现通过USART1给stm32f407单片机发送一个数,然后能接收到USART1发送出来的10个数的程序
时间: 2023-12-03 15:45:38 浏览: 45
以下是使用标准库函数和中断处理函数实现通过USART1发送和接收数据的程序:
```c
#include "stm32f4xx.h"
#include <stdio.h>
#define TX_BUFFER_SIZE 256
#define RX_BUFFER_SIZE 256
volatile uint8_t tx_buffer[TX_BUFFER_SIZE];
volatile uint8_t rx_buffer[RX_BUFFER_SIZE];
volatile uint8_t tx_head = 0, tx_tail = 0;
volatile uint8_t rx_head = 0, rx_tail = 0;
void USART1_IRQHandler(void) {
if (USART1->SR & USART_SR_RXNE) {
// Receive interrupt
uint8_t data = USART1->DR;
uint8_t next_rx_head = (rx_head + 1) % RX_BUFFER_SIZE;
if (next_rx_head != rx_tail) {
rx_buffer[rx_head] = data;
rx_head = next_rx_head;
}
}
if (USART1->SR & USART_SR_TXE) {
// Transmit interrupt
if (tx_head != tx_tail) {
USART1->DR = tx_buffer[tx_tail];
tx_tail = (tx_tail + 1) % TX_BUFFER_SIZE;
} else {
USART1->CR1 &= ~USART_CR1_TXEIE;
}
}
}
void USART1_Send(uint8_t *data, uint8_t length) {
for (int i = 0; i < length; ++i) {
uint8_t next_tx_head = (tx_head + 1) % TX_BUFFER_SIZE;
if (next_tx_head != tx_tail) {
tx_buffer[tx_head] = data[i];
tx_head = next_tx_head;
}
}
USART1->CR1 |= USART_CR1_TXEIE;
}
void USART1_Init(void) {
// Enable USART1 clock
RCC->APB2ENR |= RCC_APB2ENR_USART1EN;
// Configure USART1 pins (PA9 -> TX, PA10 -> RX)
RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN;
GPIOA->MODER |= GPIO_MODER_MODE9_1 | GPIO_MODER_MODE10_1;
GPIOA->AFR[1] |= (7 << 4) | (7 << 8);
// Configure USART1
USART1->BRR = SystemCoreClock / 115200;
USART1->CR1 |= USART_CR1_TE | USART_CR1_RE | USART_CR1_RXNEIE;
USART1->CR1 |= USART_CR1_UE;
// Enable USART1 interrupt
NVIC_EnableIRQ(USART1_IRQn);
}
int main(void) {
USART1_Init();
uint8_t data[1];
for (int i = 0; i < 10; i++) {
// Send a number
data[0] = i;
USART1_Send(data, 1);
// Wait for the number to be received
while (rx_head == rx_tail) {}
uint8_t received_data = rx_buffer[rx_tail];
rx_tail = (rx_tail + 1) % RX_BUFFER_SIZE;
printf("Received: %d\n", received_data);
}
while (1) {}
}
```
在这个程序中,我们使用了一个循环缓冲区来存储接收到的数据和要发送的数据。当有数据要发送时,我们将数据添加到循环缓冲区中,并打开USART1的TXEIE位以启用发送中断。在发送中断中,我们从循环缓冲区中读取一个字节并将其写入USART1的数据寄存器中。如果缓冲区中没有更多要发送的数据,则关闭TXEIE位以禁用发送中断。
当接收到一个字节时,我们将其添加到接收循环缓冲区中,并在接收中断中将其读取。在主函数中,我们发送数字0到9,每次发送后等待接收到一个字节。一旦接收到一个字节,我们将其打印到控制台上。