diff --git a/Inc/uart.h b/Inc/uart.h
index 1ce91c0..050fe26 100644
--- a/Inc/uart.h
+++ b/Inc/uart.h
@@ -12,6 +12,5 @@ typedef enum {
 } uart_printf_port_t;
 
 void rs485_init(void);
-// void uart_set_printf_port(uart_printf_port_t port);
 
 #endif // UART_H
diff --git a/Src/gd32e23x_it.c b/Src/gd32e23x_it.c
index 3bcff34..01293ab 100644
--- a/Src/gd32e23x_it.c
+++ b/Src/gd32e23x_it.c
@@ -103,4 +103,12 @@ void USART0_IRQHandler(void) {
         uint8_t data = usart_data_receive(USART0);
         uart_rx_put(data);
     }
+    /* 处理 USART0 中断 
+    ** USART_INT_FLAG_RBNE 读缓冲区非空中断标志
+    ** 即：当 USART0 的接收缓冲区有数据时，触发该中断
+    ** 该中断为只读中断，不需要手动清除
+    **
+    ** 
+    **
+    */
 }
\ No newline at end of file
diff --git a/Src/main.c b/Src/main.c
index 1316d4c..ef560be 100644
--- a/Src/main.c
+++ b/Src/main.c
@@ -37,15 +37,6 @@ OF SUCH DAMAGE.
 #include "uart.h"
 #include "led.h"
 #include <stdio.h>
-#include "board_config.h"
-#include "uart_ring_buffer.h"
-#include "command.h"
-
-void uart_puts(const char *s) {
-    while (*s) {
-        usart_data_transmit(RS485_PHY, (uint8_t)*s++);
-    }
-}
 
 /*!
     \brief      main function
diff --git a/Src/uart.c b/Src/uart.c
index 76a4325..6d699c9 100644
--- a/Src/uart.c
+++ b/Src/uart.c
@@ -70,32 +70,3 @@ void rs485_init(void) {
 
     #endif // RS485_MAX13487
     }
-
-// static uart_printf_port_t g_printf_port = UART_PRINTF_USART0;
-
-// void uart_set_printf_port(uart_printf_port_t port) {
-//     g_printf_port = port;
-// }
-
-// // printf 重定向，支持多串口
-// int __io_putchar(int ch) {
-//     switch (g_printf_port) {
-//         case UART_PRINTF_USART0:
-//             while (usart_flag_get(USART0, USART_FLAG_TBE) == RESET) {}
-//             usart_data_transmit(USART0, (uint8_t)ch);
-//             break;
-//         case UART_PRINTF_USART1:
-//             while (usart_flag_get(USART1, USART_FLAG_TBE) == RESET) {}
-//             usart_data_transmit(USART1, (uint8_t)ch);
-//             break;
-//         case UART_PRINTF_BOTH:
-//             while (usart_flag_get(USART0, USART_FLAG_TBE) == RESET) {}
-//             usart_data_transmit(USART0, (uint8_t)ch);
-//             while (usart_flag_get(USART1, USART_FLAG_TBE) == RESET) {}
-//             usart_data_transmit(USART1, (uint8_t)ch);
-//             break;
-//         default:
-//             break;
-//     }
-//     return ch;
-// }