举个完整示例,包括结构体定义等
时间: 2023-07-21 16:39:53 浏览: 42
好的,下面给出一个完整的示例代码,包括结构体定义、初始化、读写操作和使用示例:
```
#include <stdint.h>
#define RX_BUF_SIZE 128
typedef struct {
uint8_t buffer[RX_BUF_SIZE];
uint8_t *head;
uint8_t *tail;
uint16_t size;
} ring_buffer_t;
void ring_buffer_init(ring_buffer_t *buffer, uint16_t size) {
buffer->head = buffer->buffer;
buffer->tail = buffer->buffer;
buffer->size = size;
}
int ring_buffer_write(ring_buffer_t *buffer, uint8_t data) {
uint8_t *next_head = buffer->head + 1;
if (next_head >= buffer->buffer + buffer->size) {
next_head = buffer->buffer;
}
if (next_head == buffer->tail) {
// buffer full
return -1;
}
*(buffer->head) = data;
buffer->head = next_head;
return 0;
}
int ring_buffer_read(ring_buffer_t *buffer, uint8_t *data) {
if (buffer->head == buffer->tail) {
// buffer empty
return -1;
}
*data = *(buffer->tail);
uint8_t *next_tail = buffer->tail + 1;
if (next_tail >= buffer->buffer + buffer->size) {
next_tail = buffer->buffer;
}
buffer->tail = next_tail;
return 0;
}
ring_buffer_t rx_buffer;
void init() {
// initialize the UART and other peripherals
// ...
ring_buffer_init(&rx_buffer, RX_BUF_SIZE);
}
void uart_rx_isr() {
uint8_t data = uart_read_byte();
if (ring_buffer_write(&rx_buffer, data) != 0) {
// buffer full, discard the data
}
}
void main_loop() {
uint8_t data;
while (ring_buffer_read(&rx_buffer, &data) == 0) {
// process the data
// ...
}
// do other things
// ...
}
int main() {
init();
while (1) {
main_loop();
}
return 0;
}
```
这个示例代码实现了一个简单的串口接收缓存区,通过中断将接收到的数据写入环形缓冲区中,并在主程序中处理这些数据。
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