|
|
/*
* bsp_dht11.c
*
* Created on: Jul 24, 2024
* Author: vuxtvg@163.com
*/
#include "bsp_dht11.h"
static void (*g_delay_ms_func)(uint32_t) = NULL;
static void (*g_delay_us_func)(uint32_t) = NULL;
static void (*g_set_out_func)(void) = NULL;
static void (*g_set_in_func)(void) = NULL;
static void (*g_set_out_pin)(uint8_t state) = NULL;
static uint8_t (*g_read_in_pin)(void) = NULL;
static void dht11_delay_ms(uint32_t ms) {
if (g_delay_ms_func != NULL) {
g_delay_ms_func(ms);
}
}
static void dht11_delay_us(uint32_t us) {
if (g_delay_us_func != NULL) {
g_delay_us_func(us);
}
}
static void dht11_set_out_func(void) {
if (g_set_out_func != NULL) {
g_set_out_func();
}
}
static void dht11_set_in_func(void) {
if (g_set_in_func != NULL) {
g_set_in_func();
}
}
static void dht11_set_out_pin(uint8_t state) {
if (g_set_out_pin != NULL) {
g_set_out_pin(state);
}
}
static uint8_t dht11_read_in_pin(void) {
if (g_read_in_pin != NULL) {
return g_read_in_pin();
} else {
return 0;
}
}
//复位DHT11 \\起始
static void dhtll_rescb() {
dht11_set_out_func();
dht11_set_out_pin(0); //拉低DQ
dht11_delay_ms(20);
dht11_set_out_pin(1); //DQ=1
dht11_delay_us(30); //主机拉高20~40us
}
//等待DHT11的回应
//返回1:未检测到DHT11的存在
//返回0:存在
static uint8_t dht11_checkc() {
uint8_t retry = 0;
dht11_set_in_func(); //SET INPUT
while (dht11_read_in_pin() && retry < 100) //DHT11会拉低40~80us
{
retry++;
dht11_delay_us(1);
};
if (retry >= 100)
return 1;
else
retry = 0;
while (!dht11_read_in_pin() && retry < 100) //DHT11拉低后会再次拉高40~80us
{
retry++;
dht11_delay_us(1);
};
if (retry >= 100)
return 1;
return 0;
}
//从DHT11读取一个位
//返回值：1/0
static uint8_t dth11_read_bitc() {
uint8_t retry = 0;
while (dht11_read_in_pin() && retry < 100) //等待变为低电平
{
retry++;
dht11_delay_us(1);
} //延时100
retry = 0;
while (!dht11_read_in_pin() && retry < 100) //等待变高电平
{
retry++;
dht11_delay_us(1);
}
dht11_delay_us(40); //等待40us
if (dht11_read_in_pin())
return 1;
else
return 0;
}
//从DHT11读取一个字节
//返回值：读到的数据DHT11_Read_ByteC
static uint8_t dht11_read_bytec() {
uint8_t i, dat;
dat = 0;
for (i = 0; i < 8; i++) {
dat <<= 1;
dat |= dth11_read_bitc();
}
return dat;
}
//初始化DHT11的IO口 同时检测DHT11的存在
//返回1:不存在
//返回0:存在
static uint8_t dht11_initC() {
dht11_set_out_func();
dht11_set_out_pin(1); // 输出高
dhtll_rescb(); //复位DHT11
return dht11_checkc(); //等待DHT11的回应
}
void dht11_module_initC(dht11_module_cfg_t *cfg) {
g_delay_us_func = cfg->delay_us;
g_delay_ms_func = cfg->delay_ms;
g_read_in_pin = cfg->read_in_pin;
g_set_out_pin = cfg->set_out_pin;
g_set_in_func = cfg->set_in;
g_set_out_func = cfg->set_out;
dht11_initC();
}
uint8_t dht11_module_read_dataC(float *temperature, float *humidity) {
uint8_t buf[5];
uint8_t i;
dhtll_rescb();
if (dht11_checkc() == 0) {
for (i = 0; i < 5; i++) {
buf = dht11_read_bytec(); // 读取40位数据
}
if ((buf[0] + buf[1] + buf[2] + buf[3]) == buf[4]) {
*humidity = buf[0] + buf[1] / 10.0;
*temperature = buf[2] + buf[3] / 10.0;
return 0;
}
}
return 1;
}
/*
* bsp_dht11.h
*
* Created on: Jul 24, 2024
* Author: vuxtvg@163.com
*/
#ifndef BSP_DHT11_H_
#define BSP_DHT11_H_
#include <stdlib.h>
#include <stdint.h>
// Configuration structure
typedef struct {
void (*delay_us)(uint32_t us); //Us延时函数
void (*delay_ms)(uint32_t ms); //Ms延时函数
void (*set_out)(void); //设置引脚输出
void (*set_in)(void); //设置引脚输入
void (*set_out_pin)(uint8_t state); //输出引脚控制
uint8_t (*read_in_pin)(void); //输入引脚读取
} dht11_module_cfg_t;
void dht11_initc(void);
void dht11_module_initC(dht11_module_cfg_t *cfg);
uint8_t dht11_module_read_dataC(float *temperature, float *humidity);
#endif /* BSP_DHT11_H_ */
调用接口示例
#include "main.h"
#include "bsp_dht11.h"
#include "dwt_delay.h"
#define DHT11_GPIO_PORT GPIOB
#define DHT11_GPIO_PIN GPIO_PIN_1
#define DHT11_OUT_PORT PBout(1)
#define DHT11_IN_PORT PBin(1)
static void DHT11_SET_IN(void) {
__HAL_RCC_GPIOB_CLK_ENABLE();
GPIO_InitTypeDef GPIO_InitStruct = { 0 };
GPIO_InitStruct.Pin = DHT11_GPIO_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_PULLUP;
HAL_GPIO_Init(DHT11_GPIO_PORT, &GPIO_InitStruct);
}
static void DHT11_SET_OUT(void) {
__HAL_RCC_GPIOB_CLK_ENABLE();
GPIO_InitTypeDef GPIO_InitStruct = { 0 };
GPIO_InitStruct.Pin = DHT11_GPIO_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(DHT11_GPIO_PORT, &GPIO_InitStruct);
}
void set_out_pin(uint8_t state) {
DHT11_OUT_PORT = state;
}
// Example function to read the IN pin state
uint8_t read_in_pin(void) {
return DHT11_IN_PORT;
}
void dht11_initc(void) {
dht11_module_cfg_t dht11_config;
dht11_config.delay_ms = delay_ms_dwt;
dht11_config.delay_us = delay_us_dwt;
dht11_config.read_in_pin = read_in_pin;
dht11_config.set_in = DHT11_SET_IN;
dht11_config.set_out = DHT11_SET_OUT;
dht11_config.set_out_pin = set_out_pin;
dht11_module_initC(&dht11_config);
}
void get_temp_humi(void)
{
float temperature, humidity;
dht11_module_read_dataC(&temperature, &humidity);
printf("temperature:%.1f humidity:%.1f\r\n",temperature,humidity);
}
还请给一些建议
|
|
发表于 2024-7-24 18:25:43
发表于 2024-7-25 11:46:35
楼主
