stm32串口发送数据,比如发送“AT”把接收的数据作判断,如果是“OK”,发下一条指令“AR”,不是择返回“error”
时间: 2023-10-02 13:04:24 浏览: 45
好的,针对你的问题,我可以给出一个简单的C语言示例代码,它可以通过USART串口发送“AT”指令,并判断返回的数据是否为“OK”,如果是则发送“AR”指令,否则返回“error”信息,具体代码如下:
```c
#include "stm32f10x.h"
#define USART USART1
#define BAUDRATE 115200
void USART1_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Enable USART clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
/* Configure USART Tx and Rx pins */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART */
USART_InitStructure.USART_BaudRate = BAUDRATE;
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);
/* Enable USART */
USART_Cmd(USART1, ENABLE);
}
void USART1_SendString(char *str)
{
while (*str != '\0') {
/* Wait for USART transmit data register to be empty */
while (!(USART->SR & USART_SR_TXE));
/* Send character */
USART_SendData(USART, *str++);
}
}
char USART1_ReceiveChar(void)
{
/* Wait for USART receive data register to be non-empty */
while (!(USART->SR & USART_SR_RXNE));
/* Read character */
return USART_ReceiveData(USART);
}
int main(void)
{
char buf[32];
int i;
/* Initialize USART */
USART1_Init();
/* Send "AT" command */
USART1_SendString("AT\r\n");
/* Wait for response (up to 1 second) */
for (i = 0; i < 1000000; i++) {
if (USART1_ReceiveChar() == 'O' && USART1_ReceiveChar() == 'K') {
/* Send "AR" command */
USART1_SendString("AR\r\n");
break;
}
}
/* If no response received, return error */
if (i == 1000000) {
USART1_SendString("error\r\n");
}
while (1);
return 0;
}
```
注意,这只是一个简单的示例代码,实际应用中还需要考虑更多的情况,比如超时处理、错误处理等。同时,为了保证串口通信的稳定性,还应该考虑使用硬件流控等措施。
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