利用Keil5编写stm32f407开发版的温湿度DHT11进行数据采集,当按下key0时,LED0灯亮,数据开始采集,当按下key1,则停止采集,LED0灭,并显示相应信息到串口1及LCD下,注意DHT11所用引脚
这个是只要编写main.c的了吗,但素我不知道怎么写啊
让阿豪来帮你解答,本回答参考chatgpt3.5编写提供,如果还有疑问可以评论或留言这个问题需要编写STM32F407开发板的主程序,实现DHT11温湿度传感器的数据采集以及按键控制LED灯亮灭和数据显示。 可以采用以下步骤实现:
#include "stm32f4xx.h"
#include "lcd.h"
#include "USART1.h"
#include "DHT11.h"
void Delay(__IO uint32_t nCount);
int main(void) {
// 初始化LED和按键引脚
GPIO_InitTypeDef GPIO_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD | RCC_AHB1Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOD, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 初始化串口
USART1_Config();
// 初始化LCD
LCD_Init();
// 初始化DHT11
DHT11_Init();
while (1) {
// 循环检测按键状态
if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0)) { // 按下key0开始采集数据
GPIO_SetBits(GPIOD, GPIO_Pin_12); // LED0亮
USART1_SendString("Start to read DHT11...\n");
DHT11_Start(); // 启动DHT11数据传输
while (!GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_1)) { // 按下key1停止采集
uint8_t chk = DHT11_Read_Data(); // 读取DHT11数据
if (!chk) { // 数据读取成功
float temp = DHT11_Get_Temp(); // 获取温度值
float humi = DHT11_Get_Humi(); // 获取湿度值
char str[20];
sprintf(str, "Temperature: %.2fC\n", temp);
USART1_SendString(str);
sprintf(str, "Humidity: %.2f%%\n", humi);
USART1_SendString(str);
LCD_Clear();
LCD_ShowString(0, 0, "Temp: ");
LCD_ShowFloat(48, 0, temp, 2);
LCD_ShowString(0, 1, "Humi: ");
LCD_ShowFloat(48, 1, humi, 2);
} else { // 数据读取失败
USART1_SendString("Read DHT11 data failed!\n");
}
Delay(200);
}
GPIO_ResetBits(GPIOD, GPIO_Pin_12); // LED0灭
USART1_SendString("Stop to read DHT11...\n");
}
}
}
void Delay(__IO uint32_t nCount) {
while(nCount--) {
}
}
需要注意的是,在初始化DHT11传感器的时候需要先进行一定时间的延时,等待DHT11的初始化完成。同时,在读取DHT11数据的时候,需要不断地调用DHT11_Read_Data函数,直到按键key1被按下停止采集。 另外,需要在项目中添加lcd.c、lcd.h、DHT11.c和DHT11.h等相关文件,以便对LCD和DHT11进行初始化和数据读取等操作。 此外,还需要编写USART1的初始化和发送字符串等函数,可以参考以下示例代码进行实现:
#include "USART1.h"
#include <stdio.h>
#include <stdarg.h>
void USART1_Config(void) {
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
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_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_Cmd(USART1, ENABLE);
}
void USART1_SendChar(uint8_t ch) {
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART1->DR = (ch & 0xff);
}
void USART1_SendString(char* str) {
while (*str) {
USART1_SendChar(*str++);
}
}
void USART1_IRQHandler(void) {
if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) {
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
uint8_t ch = USART_ReceiveData(USART1);
// do something with ch
}
}
在上面的示例代码中,USART1_Config函数用于进行串口的初始化,USART1_SendChar和USART1_SendString函数用于发送数据到串口,而USART1_IRQHandler函数用于处理串口接收中断,可以在其中对接收到的数据进行相应处理。