写一个GD32f303的RS485串口驱动
时间: 2024-04-15 22:28:17 浏览: 179
当然可以!下面是一个简单的GD32f303的RS485串口驱动示例代码:
```c
#include "gd32f30x.h"
#define USART USART1
void rs485_init(void)
{
rcu_periph_clock_enable(RCU_USART1);
rcu_periph_clock_enable(RCU_AF);
gpio_init(GPIOA, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_9);
gpio_init(GPIOA, GPIO_MODE_AF_OD, GPIO_OSPEED_50MHZ, GPIO_PIN_10);
usart_deinit(USART);
usart_baudrate_set(USART, 9600);
usart_parity_config(USART, USART_PM_NONE);
usart_word_length_set(USART, USART_WL_8BIT);
usart_stop_bit_set(USART, USART_STB_1BIT);
usart_hardware_flow_rts_config(USART, USART_RTS_DISABLE);
usart_hardware_flow_cts_config(USART, USART_CTS_DISABLE);
usart_transmit_config(USART, USART_TRANSMIT_ENABLE);
usart_receive_config(USART, USART_RECEIVE_ENABLE);
usart_enable(USART);
}
void rs485_send(uint8_t *buffer, uint16_t len)
{
gpio_bit_reset(GPIOA, GPIO_PIN_10); // 设置为发送模式
for (uint16_t i = 0; i < len; i++)
{
usart_data_transmit(USART, buffer[i]);
while (usart_flag_get(USART, USART_FLAG_TC) == RESET)
;
}
while (usart_flag_get(USART, USART_FLAG_TC) == RESET)
;
gpio_bit_set(GPIOA, GPIO_PIN_10); // 设置为接收模式
}
uint16_t rs485_receive(uint8_t *buffer, uint16_t maxlen)
{
uint16_t cnt = 0;
gpio_bit_set(GPIOA, GPIO_PIN_10); // 设置为接收模式
while (usart_flag_get(USART, USART_FLAG_RBNE))
{
buffer[cnt++] = usart_data_receive(USART);
if (cnt >= maxlen)
break;
}
return cnt;
}
```
这是一个简单的RS485串口驱动的初始化、发送和接收函数示例。你可以根据自己的需求进行修改和扩展。希望对你有所帮助!如果有任何问题,请随时提问。
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