diff --git a/Inc/board_config.h b/Inc/board_config.h
index 3246d4f..2098e92 100644
--- a/Inc/board_config.h
+++ b/Inc/board_config.h
@@ -51,6 +51,8 @@
   #define RTT_PutChar(ch, c)
 #endif
 
+#define RS485_MODE            CFG_ENABLE  // CFG_DISABLE: RS485 off; CFG_ENABLE: RS485 on
+
 /******************************************************************************/
 
 /* Dynamic USART Configuration Structure */
@@ -129,6 +131,12 @@ typedef enum {
 #define UART_RX_PIN          GPIO_PIN_3
 #define UART_BAUDRATE        115200U
 
+#if RS485_MODE == CFG_ENABLE
+#define RS485_DE_RCU         RCU_GPIOA
+#define RS485_DE_PORT        GPIOA
+#define RS485_DE_PIN         GPIO_PIN_1
+#endif
+
 /******************************************************************************/
 
 #define DEBUG_UART              USART0
diff --git a/Src/uart.c b/Src/uart.c
index 347f0a8..c9ec8a7 100644
--- a/Src/uart.c
+++ b/Src/uart.c
@@ -17,6 +17,14 @@ void uart_init(void) {
     gpio_mode_set(UART_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, UART_TX_PIN | UART_RX_PIN);
     gpio_output_options_set(UART_GPIO_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, UART_TX_PIN | UART_RX_PIN);
 
+#if RS485_MODE == CFG_ENABLE
+    /* 配置 RS485 DE 引脚 */
+    rcu_periph_clock_enable(RS485_DE_RCU);
+    gpio_mode_set(RS485_DE_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, RS485_DE_PIN);
+    gpio_output_options_set(RS485_DE_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, RS485_DE_PIN);
+    gpio_bit_reset(RS485_DE_PORT, RS485_DE_PIN); // 初始状态为接收模式
+#endif
+
     /* 配置波特率、数据位、停止位等 */
     usart_deinit(UART_PHY);
     usart_word_length_set(UART_PHY, USART_WL_8BIT);
@@ -26,6 +34,13 @@ void uart_init(void) {
     usart_receive_config(UART_PHY, USART_RECEIVE_ENABLE);
     usart_transmit_config(UART_PHY, USART_TRANSMIT_ENABLE);
 
+#if RS485_MODE == CFG_ENABLE
+    // 配置 RS485 模式
+    usart_rs485_driver_enable(UART_PHY);
+    usart_driver_assertime_config(UART_PHY, 10); // 设置驱动器断言时间为 10 个时钟周期
+    usart_driver_deassertime_config(UART_PHY, 10); // 设置驱动器去断言时间为 10 个时钟周期
+
+#endif
     usart_enable(UART_PHY);
 
     nvic_irq_enable(UART_IRQ, 0);