串口环形缓冲区强化：单独单写及最小临界区修改

Src/command.c

@@ -11,6 +11,7 @@
 
 #include "command.h"
 #include "uart_ring_buffer.h"
+#include "uart.h"
 #include "led.h"
 #include <stdint.h>
 #include <stdbool.h>
@@ -588,7 +589,9 @@ void command_process(void) {
                 handle_command(cmd_buf, expected_cmd_len);
             } else {
                 // 验证失败时清空缓冲区，避免后续帧受影响
+                uart_rx_irq_pause();
                 uart_ring_buffer_clear();
+                uart_rx_irq_resume();
             }
 
             // 复位，等待下一帧
@@ -633,7 +636,9 @@ void command_execute(const char *cmd_str)
     frame_buf[frame_len - 1] = (uint8_t)(crc & 0xFF);
 
     // 清空缓冲区并执行命令
+    uart_rx_irq_pause();
     uart_ring_buffer_clear();
+    uart_rx_irq_resume();
     for (uint8_t i = 0; i < frame_len; i++) {
         uart_ring_buffer_put(frame_buf[i]);
     }

Src/uart.c

@@ -32,6 +32,14 @@ void uart_init(void) {
     usart_interrupt_enable(UART_PHY, USART_INT_RBNE);
 }
 
+void uart_rx_irq_pause(void) {
+    usart_interrupt_disable(UART_PHY, USART_INT_RBNE);
+}
+
+void uart_rx_irq_resume(void) {
+    usart_interrupt_enable(UART_PHY, USART_INT_RBNE);
+}
+
 /******************************************************************************/
 /* 具体的中断处理函数实现 */
 /******************************************************************************/

Src/uart_ring_buffer.c

@@ -6,12 +6,25 @@
  * @ingroup RingBuffer
  */
 #include "uart_ring_buffer.h"
+#include "gd32e23x.h"
 
 static volatile uint8_t uart_rx_buffer[UART_RX_BUFFER_SIZE];
 static volatile uint8_t write_index = 0;
 static volatile uint8_t read_index = 0;
 static volatile uint32_t dropped_bytes = 0;
 
+static inline uint32_t irq_save(void) {
+    uint32_t primask = __get_PRIMASK();
+    __disable_irq();
+    return primask;
+}
+
+static inline void irq_restore(uint32_t primask) {
+    if (primask == 0U) {
+        __enable_irq();
+    }
+}
+
 /**
  * @brief 重置环形缓冲区状态。
  * @details 将读指针、写指针与丢弃计数清零，不清空数据区内容。
@@ -31,7 +44,9 @@ static void uart_ring_buffer_reset_state(void) {
  * @ingroup RingBuffer
  */
 void uart_ring_buffer_init(void) {
+    uint32_t irq_key = irq_save();
     uart_ring_buffer_reset_state();
+    irq_restore(irq_key);
 }
 
 /**
@@ -90,7 +105,9 @@ bool uart_ring_buffer_put(uint8_t data) {
  * @ingroup RingBuffer
  */
 void uart_ring_buffer_clear(void) {
+    uint32_t irq_key = irq_save();
     uart_ring_buffer_reset_state();
+    irq_restore(irq_key);
 }
 
 /**