单片机c语言串口队列收发代码
时间: 2024-09-19 07:17:53 浏览: 93
在单片机C语言中,串口通信通常使用硬件中断来管理接收和发送数据。对于串口队列,我们可以创建一个结构体来存储待发送的数据,并使用两个队列分别处理发送和接收任务。下面是一个简化的示例:
```c
#include <stdio.h>
#include <stdlib.h>
#include "uart.h" // 假设这是包含UART函数的头文件
// 定义串口队列结构
typedef struct {
char *data; // 存储数据指针
int len; // 数据长度
} SerialQueueItem;
// 发送队列
SerialQueueItem send_queue[QUEUE_SIZE];
int send_head = -1;
int send_tail = -1;
// 接收队列
SerialQueueItem receive_queue[QUEUE_SIZE];
int receive_head = -1;
int receive_tail = -1;
// 添加到发送队列
void enqueue_send(char *data, int len) {
if (send_tail == (send_head + QUEUE_SIZE - 1)) {
printf("Send queue full, data not added.\n");
return;
}
send_queue[send_tail].data = data;
send_queue[send_tail].len = len;
send_tail = (send_tail + 1) % QUEUE_SIZE;
}
// 从发送队列移除并发送数据
void dequeue_send() {
if (send_head == -1 || send_head == receive_tail) {
printf("No data to send or receive buffer is empty.\n");
return;
}
UART_send(send_queue[send_head].data, send_queue[send_head].len);
send_head = (send_head + 1) % QUEUE_SIZE;
}
// 从接收队列读取数据
char* dequeue_receive() {
if (receive_head == receive_tail) {
printf("No data received yet.\n");
return NULL;
}
char *received_data = receive_queue[receive_head].data;
// 更新接收队列
receive_head = (receive_head + 1) % QUEUE_SIZE;
return received_data;
}
// 当接收到新数据时的回调函数(假设是通过中断)
void uart_received(int data) {
SerialQueueItem item;
item.data = (char*)&data;
item.len = sizeof(data);
enqueue_receive(item.data, item.len);
}
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