c
#include "gd32f10x.h"
#include "usart.h"
#include "gpio.h"
// 假设使用USART0作为485通信接口
#define RS485_TX_EN_PIN GPIO_PIN_0
#define RS485_RX_EN_PIN GPIO_PIN_1
#define RS485_CTRL_PORT GPIOA
void rs485_init(void) {
// 初始化USART0
usart_deinit(USART0);
usart_baudrate_set(USART0, 9600U);
usart_word_length_set(USART0, USART_WL_8BIT);
usart_stop_bit_set(USART0, USART_STB_1BIT);
usart_parity_config(USART0, USART_PM_NONE);
usart_hardware_flow_rts_config(USART0, USART_RTS_DISABLE);
usart_hardware_flow_cts_config(USART0, USART_CTS_DISABLE);
usart_receive_config(USART0, USART_RECEIVE_ENABLE);
usart_transmit_config(USART0, USART_TRANSMIT_ENABLE);
usart_enable(USART0);
// 初始化GPIO用于控制485收发器
gpio_init(RS485_CTRL_PORT, GPIO_MODE_OUT_PP, GPIO_OSPEED_50MHZ, RS485_TX_EN_PIN | RS485_RX_EN_PIN);
gpio_bit_reset(RS485_CTRL_PORT, RS485_TX_EN_PIN); // 初始化为接收模式
gpio_bit_set(RS485_CTRL_PORT, RS485_RX_EN_PIN);
}
void rs485_send_data(uint8_t *data, uint16_t len) {
// 切换为发送模式
gpio_bit_set(RS485_CTRL_PORT, RS485_TX_EN_PIN);
gpio_bit_reset(RS485_CTRL_PORT, RS485_RX_EN_PIN);
// 发送数据
for (uint16_t i = 0; i < len; i++) {
usart_data_transmit(USART0, data[i]);
while (usart_flag_get(USART0, USART_FLAG_TBE) == RESET);
}
// 切换回接收模式
gpio_bit_reset(RS485_CTRL_PORT, RS485_TX_EN_PIN);
gpio_bit_set(RS485_CTRL_PORT, RS485_RX_EN_PIN);
}
// 假设使用中断方式接收数据
void USART0_IRQHandler(void) {
if (usart_interrupt_flag_get(USART0, USART_INT_FLAG_RBNE) != RESET) {
uint8_t data = usart_data_receive(USART0);
// 将接收到的数据存储到缓冲区或进行转发处理
}
}
int main(void) {
rs485_init();
// 使能USART0接收中断
usart_interrupt_enable(USART0, USART_INT_RBNE);
nvic_irq_enable(USART0_IRQn, 0, 0);
while (1) {
// 应用程序逻辑，包括指令发送和回复数据处理
// 例如：rs485_send_data(指令数据, 指令长度);
}
} |
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