keil编写一个定时读取串口数据的软件
时间: 2024-02-24 22:00:48 浏览: 18
下面是一个基于Keil的定时读取串口数据的软件的示例代码:
```
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "stm32f10x.h"
#define USARTx USART1
#define USARTx_IRQn USART1_IRQn
#define BUFFER_SIZE 1024
volatile uint32_t tick_count = 0;
volatile uint8_t buffer[BUFFER_SIZE];
volatile uint32_t buffer_head = 0;
volatile uint32_t buffer_tail = 0;
void USART_Configuration(void) {
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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_InitStructure.USART_BaudRate = 115200;
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(USARTx, &USART_InitStructure);
USART_ITConfig(USARTx, USART_IT_RXNE, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = USARTx_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_Cmd(USARTx, ENABLE);
}
void SysTick_Handler(void) {
tick_count++;
}
void USART1_IRQHandler(void) {
if (USART_GetITStatus(USARTx, USART_IT_RXNE) != RESET) {
buffer[buffer_head] = USART_ReceiveData(USARTx);
buffer_head = (buffer_head + 1) % BUFFER_SIZE;
}
}
int main(void) {
uint32_t tick_last = 0;
uint32_t data_length = 0;
uint8_t data[BUFFER_SIZE] = {0};
uint32_t i;
SystemInit();
SysTick_Config(SystemCoreClock / 1000);
USART_Configuration();
while (1) {
if (tick_count - tick_last >= 1000) {
tick_last = tick_count;
data_length = buffer_head - buffer_tail;
if (data_length > BUFFER_SIZE)
data_length += BUFFER_SIZE;
if (data_length > 0) {
for (i = 0; i < data_length; i++) {
data[i] = buffer[(buffer_tail + i) % BUFFER_SIZE];
}
buffer_tail = (buffer_tail + data_length) % BUFFER_SIZE;
printf("Received data: %s\n", data);
}
}
}
}
```
在这个示例代码中,我们使用了STM32F103芯片的USART1串口模块,将接收到的数据存储在一个循环缓冲区中,并使用SysTick定时器每隔1秒读取一次缓冲区数据。在实际应用中,可以根据实际需求修改定时器的时间间隔、缓冲区大小等参数,以满足不同的应用场景。需要注意的是,这里只是一个基本的示例,实际使用中需要考虑更多的细节和特殊情况,以保证程序的稳定性和可靠性。