嵌入式STM32 rs232通讯程序
时间: 2023-10-02 07:08:43 浏览: 48
以下是一个简单的嵌入式STM32 RS232通讯程序示例:
```c
#include "stm32f10x.h"
void USART1_Init(void);
void USART1_SendChar(char ch);
void USART1_SendString(char* str);
int main(void) {
USART1_Init();
while (1) {
USART1_SendString("Hello, world!\r\n");
for (int i = 0; i < 500000; i++);
}
}
void USART1_Init(void) {
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitTypeDef USART_InitStructure;
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);
USART_Cmd(USART1, ENABLE);
}
void USART1_SendChar(char ch) {
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, ch);
}
void USART1_SendString(char* str) {
while (*str) {
USART1_SendChar(*str++);
}
}
```
此示例代码使用USART1配置为9600波特率的RS232串口。USART1使用GPIOA的Pin9和Pin10。主函数在循环中发送字符串“Hello, world!”,每次发送完成后延迟一定时间。USART1_Init()函数用于初始化USART1和GPIOA的引脚。USART1_SendChar()和USART1_SendString()函数用于发送单个字符和字符串。在发送之前,需要检查USART1的TXE标志是否为RESET。如果是,则发送数据,否则等待TXE标志被设置为RESET。