add usart(rs485)

CMakeLists.txt

@@ -18,8 +18,8 @@ set(TARGET_C_SRC
         ${CMAKE_SOURCE_DIR}/src/main.c
         ${CMAKE_SOURCE_DIR}/src/gd32e23x_it.c
         ${CMAKE_SOURCE_DIR}/src/systick.c
-        ${CMAKE_SOURCE_DIR}/src/peripheral.c
         ${CMAKE_SOURCE_DIR}/src/led.c
+        ${CMAKE_SOURCE_DIR}/src/usart.c
 )
 
 add_executable(gd32e23x_template ${TARGET_C_SRC})

README.md

@@ -15,7 +15,6 @@ set(TARGET_C_SRC
         ${CMAKE_SOURCE_DIR}/src/main.c
         ${CMAKE_SOURCE_DIR}/src/gd32e23x_it.c
         ${CMAKE_SOURCE_DIR}/src/systick.c
-        ${CMAKE_SOURCE_DIR}/src/peripheral.c
 )
 ```
 ## 关于链接脚本

inc/board_config.h

@@ -21,13 +21,15 @@
 
 /******************************************************************************/
 
-#define RS485_RCU            RCU_USART0
+#define USART_RCU            RCU_USART0
-#define RS485_GPIO_RCU       RCU_GPIOA
+#define USART_GPIO_RCU       RCU_GPIOA
-#define RS485_GPIO_PORT      GPIOA
+#define USART_GPIO_PORT      GPIOA
-#define RS485_TX_PIN         GPIO_PIN_2
+#define USART_GPIO_AF        GPIO_AF_1
-#define RS485_RX_PIN         GPIO_PIN_3
+#define USART_TX_PIN         GPIO_PIN_2
-#define RS485_PHY            USART0
+#define USART_RX_PIN         GPIO_PIN_3
-#define RS485_BAUDRATE       115200U
+#define USART_PHY            USART0
+#define USART_PHY_BAUDRATE   115200U
+#define RS485_EN_PORT        GPIOA
 #define RS485_EN_PIN         GPIO_PIN_1
 
 /******************************************************************************/

inc/gd32e23x_it.h

@@ -36,6 +36,9 @@ OF SUCH DAMAGE.
 #define GD32E23X_IT_H
 
 #include "gd32e23x.h"
+#include "main.h"
+#include "systick.h"
+#include "board_config.h"
 
 /* function declarations */
 /* this function handles NMI exception */
@@ -49,4 +52,6 @@ void PendSV_Handler(void);
 /* this function handles SysTick exception */
 void SysTick_Handler(void);
 
+void TIMER16_IRQHandler(void);
+
 #endif /* GD32E23X_IT_H */

inc/main.h

@@ -35,4 +35,12 @@ OF SUCH DAMAGE.
 #ifndef MAIN_H
 #define MAIN_H
 
+#include <stdio.h>
+#include "gd32e23x.h"
+#include "systick.h"
+#include "gd32e23x_libopt.h"
+#include "led.h"
+#include "usart.h"
+#include "board_config.h"
+
 #endif /* MAIN_H */

inc/peripheral.h

@@ -1,11 +0,0 @@
-//
-// Created by yelv1 on 24-9-22.
-//
-
-#ifndef PERIPHERAL_H
-#define PERIPHERAL_H
-
-void usart_config(void);
-
-
-#endif //PERIPHERAL_H

inc/usart.h

@@ -0,0 +1,15 @@
+//
+// Created by yelv1 on 24-12-30.
+//
+
+#ifndef USART_H
+#define USART_H
+
+#include "gd32e23x.h"
+#include "board_config.h"
+
+void usart_config(void);
+
+void rs485_config(void);
+
+#endif //USART_H

src/gd32e23x_it.c

@@ -33,9 +33,6 @@ OF SUCH DAMAGE.
 */
 
 #include "gd32e23x_it.h"
-#include "main.h"
-#include "systick.h"
-#include "board_config.h"
 
 /*!
     \brief      this function handles NMI exception
@@ -99,6 +96,12 @@ void SysTick_Handler(void)
 {
 }
 
+/*!
+    \brief      this function handles TIMER16 interrupt request
+    \param[in]  none
+    \param[out] none
+    \retval     none
+*/
 void TIMER16_IRQHandler(void)
 {
     if (timer_interrupt_flag_get(LED_BLINK_TIMER, TIMER_INT_FLAG_UP) == SET)

src/main.c

@@ -5,12 +5,6 @@
     \version 2024-02-22, V2.1.0, firmware for GD32E23x
 */
 #include "main.h"
-#include <stdio.h>
-#include "gd32e23x.h"
-#include "systick.h"
-#include "gd32e23x_libopt.h"
-
-#include "peripheral.h"
 
 /*!
     \brief      main function
@@ -22,7 +16,9 @@ int main(void)
 {
     /* configure systick */
     systick_config();
-    usart_config();
+    /* configure USART */
+    rs485_config();
+    /* configure LED */
     led_blink_config();
 
     delay_ms(5000);
@@ -35,10 +31,8 @@ int main(void)
 }
 
 /* retarget the C library printf function to the USART */
-int _write (int fd, char *pBuffer, int size)
+int _write(int fd, char *pBuffer, int size) {
-{
+    for (int i = 0; i < size; i++) {
-    for (int i = 0; i < size; i++)
-    {
         usart_data_transmit(USART0, (uint8_t) pBuffer[i]);
         while (RESET == usart_flag_get(USART0, USART_FLAG_TBE));
     }

src/peripheral.c

@@ -1,33 +0,0 @@
-//
-// Created by yelv1 on 24-9-22.
-//
-#include "peripheral.h"
-#include "gd32e23x.h"
-
-void usart_config(void)
-{
-    rcu_periph_clock_enable(RCU_GPIOA);
-    rcu_periph_clock_enable(RCU_USART0);
-
-    gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_3);
-    gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_2);
-
-    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_3);
-    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_3);
-    gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_2);
-    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_2);
-
-    usart_deinit(USART0);
-    usart_baudrate_set(USART0, 115200U);
-    usart_receive_config(USART0, USART_RECEIVE_ENABLE);
-    usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);
-
-    usart_enable(USART0);
-
-    gpio_mode_set(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_4);
-    gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_4);
-
-    gpio_bit_write(GPIOA, GPIO_PIN_4, SET);
-}
-
-

src/usart.c

@@ -0,0 +1,46 @@
+//
+// Created by yelv1 on 24-12-30.
+//
+
+#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);
+}
+
+/**
+ * @brief  configure the RS485(MAX13487) driver
+ * @param  none
+ * @retval none
+ */
+void rs485_config(void)
+{
+    usart_config();
+
+    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_bit_write(RS485_EN_PORT, RS485_EN_PIN, SET); //auto dircetion control
+}