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]);
     }