利用定时器4中断处理功能,实现每隔2s,读取实现将温湿度传感器的值上传到串口小助手
时间: 2024-03-14 19:48:29 浏览: 78
STM8学习笔记---定时器 TIM4功能实现-综合文档
好的,以下是代码示例:
```
#include "stm32f10x.h"
void TIM4_IRQHandler(void) {
if (TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET) {
// 读取温湿度传感器的值
float temperature = 0.0;
float humidity = 0.0;
// 读取温湿度传感器的值并赋值给temperature和humidity变量
// 将温湿度传感器的值上传到串口小助手
char message[50];
sprintf(message, "Temperature: %.2f, Humidity: %.2f\n", temperature, humidity);
USART_SendString(USART1, message);
TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
}
}
int main(void) {
// 初始化定时器4
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
TIM_TimeBaseInitStruct.TIM_Prescaler = 7200 - 1;
TIM_TimeBaseInitStruct.TIM_Period = 20000 - 1; // 2s周期
TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseInitStruct);
// 使能定时器4中断,并设置优先级
NVIC_InitTypeDef NVIC_InitStruct;
NVIC_InitStruct.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStruct);
TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);
// 初始化串口1
USART_InitTypeDef USART_InitStruct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
USART_InitStruct.USART_BaudRate = 115200;
USART_InitStruct.USART_WordLength = USART_WordLength_8b;
USART_InitStruct.USART_StopBits = USART_StopBits_1;
USART_InitStruct.USART_Parity = USART_Parity_No;
USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStruct.USART_Mode = USART_Mode_Tx;
USART_Init(USART1, &USART_InitStruct);
USART_Cmd(USART1, ENABLE);
// 开启定时器4
TIM_Cmd(TIM4, ENABLE);
// 进入一个无限循环等待中断触发
while (1);
}
```
在中断服务函数中,我们读取温湿度传感器的值,并将其上传到串口小助手。在主函数中,我们初始化了串口1,并开启了定时器4。由于我们将定时器的周期设置为2s,所以每隔2s就会触发一次中断,从而读取温湿度传感器的值并将其上传到串口小助手。
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