diff --git a/inc/board_config.h b/inc/board_config.h
index a3a36cb..10948e6 100644
--- a/inc/board_config.h
+++ b/inc/board_config.h
@@ -51,7 +51,7 @@
 #define USART_PHY            USART0
 #define USART_PHY_BAUDRATE   115200U
 #define RS485_EN_PORT        GPIOA
-#define RS485_EN_PIN         GPIO_PIN_4
+#define RS485_EN_PIN         GPIO_PIN_1
 
 /******************************************************************************/
 
diff --git a/inc/usart.h b/inc/usart.h
index 2c523d0..35f8df9 100644
--- a/inc/usart.h
+++ b/inc/usart.h
@@ -8,8 +8,6 @@
 #include "gd32e23x.h"
 #include "board_config.h"
 
-void usart_config(void);
-
 void rs485_config(void);
 
 #endif //USART_H
diff --git a/src/rs485_protocol.c b/src/rs485_protocol.c
index da44bf9..2c3ed8c 100644
--- a/src/rs485_protocol.c
+++ b/src/rs485_protocol.c
@@ -21,12 +21,12 @@ void process_command(uint8_t *cmd, size_t length) {
             sprintf(combined_str, "%c%c", cmd[3], cmd[4]);
         if (strcmp(combined_str, "M1") == 0) {
             ultrasonic_distance_report();
-        } else if (strcmp(combined_str, "M2") == 0) {
-            gd60914_tempture_report();
-        } else if (strcmp(combined_str, "M3") == 0)
-        {
-            printf("%c%c%c%c%c%c", 0xB5, 0xF1, 0x02, 0x6F, 0x6B, 0xCC);
-            fwdgt_reset_mcu();
+        // } else if (strcmp(combined_str, "M2") == 0) {
+        //     gd60914_tempture_report();
+        // } else if (strcmp(combined_str, "M3") == 0)
+        // {
+        //     printf("%c%c%c%c%c%c", 0xB5, 0xF1, 0x02, 0x6F, 0x6B, 0xCC);
+        //     fwdgt_reset_mcu();
         } else {
             printf("%c%c%c%c%c%c%c", 0xB5, 0xF0, 0x03, 0x65, 0x72, 0x72, 0x3C);
             return;
diff --git a/src/usart.c b/src/usart.c
index 4416f9e..d6f1be3 100644
--- a/src/usart.c
+++ b/src/usart.c
@@ -4,36 +4,6 @@
 
 #include "usart.h"
 
-/**
- * @brief  configure the USART
- * @param  none
- * @retval none
- */
-void usart_config(void)
-{
-    rcu_periph_clock_enable(USART_GPIO_RCU);
-    rcu_periph_clock_enable(USART_RCU);
-
-    gpio_af_set(USART_GPIO_PORT, USART_GPIO_AF, USART_RX_PIN);
-    gpio_af_set(USART_GPIO_PORT, USART_GPIO_AF, USART_TX_PIN);
-
-    gpio_mode_set(USART_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, USART_RX_PIN);
-    gpio_output_options_set(USART_GPIO_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, USART_RX_PIN);
-    gpio_mode_set(USART_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, USART_TX_PIN);
-    gpio_output_options_set(USART_GPIO_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, USART_TX_PIN);
-
-    usart_deinit(USART_PHY);
-    usart_baudrate_set(USART_PHY, USART_PHY_BAUDRATE);
-    usart_receive_config(USART_PHY, USART_RECEIVE_ENABLE);
-    usart_transmit_config(USART_PHY, USART_TRANSMIT_ENABLE);
-
-    usart_enable(USART_PHY);
-
-    nvic_irq_enable(USART0_IRQn, 0);
-    usart_interrupt_enable(USART_PHY, USART_INT_RBNE);
-    usart_interrupt_enable(USART_PHY, USART_INT_IDLE);
-}
-
 /**
  * @brief  configure the RS485(MAX13487) driver
  * @param  none
@@ -41,10 +11,39 @@ void usart_config(void)
  */
 void rs485_config(void)
 {
-    usart_config();
+    rcu_periph_clock_enable(USART_GPIO_RCU);
+    rcu_periph_clock_enable(USART_RCU);
 
-    gpio_mode_set(RS485_EN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, RS485_EN_PIN);
-    gpio_output_options_set(RS485_EN_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, RS485_EN_PIN);
+    gpio_af_set(USART_GPIO_PORT, GPIO_AF_1, USART_TX_PIN | USART_RX_PIN | RS485_EN_PIN);
 
-    gpio_bit_write(RS485_EN_PORT, RS485_EN_PIN, SET); //auto dircetion control
+    /* configure USART Tx&Rx as alternate function push-pull */
+    gpio_mode_set(USART_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, USART_TX_PIN | USART_RX_PIN);
+    gpio_output_options_set(USART_GPIO_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, USART_TX_PIN | USART_RX_PIN);
+
+    /* configure RS485 EN Pin */
+    gpio_mode_set(USART_GPIO_PORT, GPIO_MODE_AF, GPIO_PUPD_NONE, RS485_EN_PIN);
+    gpio_output_options_set(USART_GPIO_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, RS485_EN_PIN);
+    // gpio_bit_write(RS485_GPIO_PORT, RS485_EN_PIN, SET);
+
+    /* USART configure */
+    usart_deinit(USART_PHY);
+    usart_baudrate_set(USART_PHY, USART_PHY_BAUDRATE);
+    // usart_parity_config(RS485_PHY, USART_PM_NONE);
+    // usart_word_length_set(RS485_PHY, USART_WL_8BIT);
+    // usart_stop_bit_set(RS485_PHY, USART_STB_1BIT);
+    usart_receive_config(USART_PHY, USART_RECEIVE_ENABLE);
+    usart_transmit_config(USART_PHY, USART_TRANSMIT_ENABLE);
+
+    usart_driver_assertime_config(USART_PHY, 0x01);
+    usart_driver_deassertime_config(USART_PHY, 0x01);
+
+    // usart_depolarity_config(USART0, USART_DEP_HIGH);
+    // usart_depolarity_config(USART0, USART_DEP_LOW);
+
+    usart_rs485_driver_enable(USART_PHY);
+    usart_enable(USART_PHY);
+
+    nvic_irq_enable(USART0_IRQn, 0);
+    usart_interrupt_enable(USART_PHY, USART_INT_RBNE);
+    usart_interrupt_enable(USART_PHY, USART_INT_IDLE);
 }
\ No newline at end of file