generated from hulk/gd32e23x_template_cmake_vscode
59 lines
1.7 KiB
C
59 lines
1.7 KiB
C
#include "uart_ring_buffer.h"
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// 环形缓冲区结构体定义（精简版）
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struct uart_ring_buffer {
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volatile uint8_t buffer[UART_RX_BUFFER_SIZE];
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volatile uint8_t head; // 写指针
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volatile uint8_t tail; // 读指针
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};
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static uart_ring_buffer_t uart_rx_buf = {0};
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static void uart_ring_buffer_reset_state(void) {
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uart_rx_buf.head = 0;
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uart_rx_buf.tail = 0;
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}
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void uart_ring_buffer_init(void) {
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uart_ring_buffer_reset_state();
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}
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uint8_t uart_ring_buffer_available(void) {
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uint8_t h = uart_rx_buf.head;
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uint8_t t = uart_rx_buf.tail;
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return (uint8_t)((h + UART_RX_BUFFER_SIZE - t) % UART_RX_BUFFER_SIZE);
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}
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/**
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* @brief 从UART环形缓冲区中获取一个数据
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*
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* @return int 成功返回获取到的8位数据，如果缓冲区为空则返回-1
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*/
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int uart_ring_buffer_get(void) {
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// 检查环形缓冲区是否为空（tail与head相等表示缓冲区为空）
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if (uart_rx_buf.tail == uart_rx_buf.head) return -1;
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// 从缓冲区tail位置获取数据
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uint8_t data = uart_rx_buf.buffer[uart_rx_buf.tail];
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// 更新tail位置，实现环形缓冲区的循环使用
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// 使用取模运算确保tail在缓冲区大小范围内循环
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uart_rx_buf.tail = (uart_rx_buf.tail + 1) % UART_RX_BUFFER_SIZE;
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// 返回获取到的数据
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return data;
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}
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bool uart_ring_buffer_put(uint8_t data) {
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uint8_t next = (uart_rx_buf.head + 1) % UART_RX_BUFFER_SIZE;
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if (next != uart_rx_buf.tail) {
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uart_rx_buf.buffer[uart_rx_buf.head] = data;
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uart_rx_buf.head = next;
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return true;
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} else {
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// 缓冲区满，静默丢弃新数据
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return false;
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}
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}
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void uart_ring_buffer_clear(void) {
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uart_ring_buffer_reset_state();
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}
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