STM32RS485通信代码
时间: 2023-09-17 08:06:27 浏览: 112
下面是一份基于STM32的RS485通信代码,你可以根据自己的需求进行修改:
```c
#include "stm32f10x.h"
#include "stdio.h"
#include "string.h"
/* 串口1初始化函数 */
void USART1_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* 打开USART和GPIO的时钟 */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
/* 配置USART1的GPIO */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; // TX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; // RX
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 配置USART1的工作参数 */
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
/* 打开USART1 */
USART_Cmd(USART1, ENABLE);
}
/* RS485发送数据函数 */
void RS485_SendData(USART_TypeDef* USARTx, uint8_t *Data, uint16_t len)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* 切换为发送模式 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 发送数据 */
while(len--)
{
/* 发送一个字节 */
USART_SendData(USARTx, *Data++);
/* 等待发送完成 */
while(USART_GetFlagStatus(USARTx, USART_FLAG_TC) == RESET);
}
/* 切换为接收模式 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
/* RS485接收数据函数 */
uint16_t RS485_ReceiveData(USART_TypeDef* USARTx, uint8_t *Data, uint16_t max_len)
{
uint16_t count = 0;
GPIO_InitTypeDef GPIO_InitStructure;
/* 切换为接收模式 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* 接收数据 */
while(count < max_len)
{
/* 等待接收到数据 */
while(USART_GetFlagStatus(USARTx, USART_FLAG_RXNE) == RESET);
/* 读取数据 */
*Data++ = USART_ReceiveData(USARTx);
count++;
}
return count;
}
int main(void)
{
uint8_t sendData[20] = "Hello World!";
uint8_t recvData[20];
uint16_t recvLen;
/* 初始化USART1 */
USART1_Config();
while(1)
{
/* 发送数据 */
RS485_SendData(USART1, sendData, strlen(sendData));
/* 接收数据 */
recvLen = RS485_ReceiveData(USART1, recvData, sizeof(recvData));
/* 处理接收到的数据 */
if(recvLen > 0)
{
recvData[recvLen] = '\0';
printf("Received Data: %s\r\n", recvData);
}
}
}
```
注意,这份代码只是一个简单的示例,你需要根据具体的硬件环境和通信协议进行适当的修改。
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