目录
[2.1 宏定义](#2.1 宏定义)
[2.2 延时](#2.2 延时)
[2.3 设置引脚输出](#2.3 设置引脚输出)
[2.4 设置引脚输入](#2.4 设置引脚输入)
[2.5 复位](#2.5 复位)
[2.6 检测函数](#2.6 检测函数)
[2.7 读取DHT11一个位](#2.7 读取DHT11一个位)
[2.7.1 数据位为0的电平信号显示](#2.7.1 数据位为0的电平信号显示)
[2.7.2 数据位为1的电平信号显示](#2.7.2 数据位为1的电平信号显示)
[2.8 读取DHT11一个字节](#2.8 读取DHT11一个字节)
[2.9 DHT11初始化](#2.9 DHT11初始化)
[2.10 读取DHT11一次数据](#2.10 读取DHT11一次数据)
[3.1 光敏电阻DO](#3.1 光敏电阻DO)
[3.1.1 CubeMx配置](#3.1.1 CubeMx配置)
[3.1.2 初始化光敏电阻DO](#3.1.2 初始化光敏电阻DO)
[3.2 光敏电阻AO](#3.2 光敏电阻AO)
[3.2.1 CubeMx配置](#3.2.1 CubeMx配置)
[3.2.2 初始化光敏电阻AO](#3.2.2 初始化光敏电阻AO)
1、DS18B20读取
cpp
int16_t ds18b20_read(void)
{
uint8_t Val[2];
int16_t x;
ow_reset();
ow_byte_wr(OW_SKIP_ROM);
ow_byte_wr(DS18B20_CONVERT);
delay_us(750000);
ow_reset();
ow_byte_wr(OW_SKIP_ROM);
ow_byte_wr(DS18B20_READ);
int i;
for(i=0;i<2;i++)
{
Val[i] = ow_byte_rd();
}
x = Val[1];
x <<= 8;
x |= Val[0];
return x;
}2、DHT11
2.1 宏定义
cpp
#define DHT11_PIN_PORT GPIOA
#define DHT11_PIN GPIO_PIN_7
#define DHT11_PIN_CLOCK __HAL_RCC_GPIOA_CLK_ENABLE()
#define DHT11_PIN_OUT_H HAL_GPIO_WritePin(DHT11_PIN_PORT, DHT11_PIN, GPIO_PIN_SET)
#define DHT11_PIN_OUT_L HAL_GPIO_WritePin(DHT11_PIN_PORT, DHT11_PIN, GPIO_PIN_RESET)
#define DHT11_PIN_IN HAL_GPIO_ReadPin(DHT11_PIN_PORT, DHT11_PIN)2.2 延时
cpp
#define Delay_us(X) delay((X)*80/5)
void delay(unsigned int n)
{
while(n--);
}2.3 设置引脚输出
cpp
void DHT11_PIN_OUT(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/**/
GPIO_InitStruct.Pin = DHT11_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;//推挽输出
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;//高速
HAL_GPIO_Init(DHT11_PIN_PORT, &GPIO_InitStruct);
}2.4 设置引脚输入
cpp
void DHT11_PIN_INPUT(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
DHT11_PIN_CLOCK;
/**/
GPIO_InitStruct.Pin = DHT11_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;//输入
GPIO_InitStruct.Pull = GPIO_PULLUP;//上拉
HAL_GPIO_Init(DHT11_PIN_PORT, &GPIO_InitStruct);
}2.5 复位
cpp
//复位DHT11
void DHT11_Rst(void)
{
DHT11_PIN_OUT(); //设置为输出
DHT11_PIN_OUT_L; //低电平
HAL_Delay(20); //拉低至少18ms
DHT11_PIN_OUT_H; //高电平
Delay_us(60); //主机拉高20~40us
}2.6 检测函数
cpp
//等待DHT11的回应
//返回1:未检测到DHT11的存在
//返回0:存在
uint8_t DHT11_Check(void)
{
uint8_t re = 0;
DHT11_PIN_INPUT(); //设置为输入
while (DHT11_PIN_IN && re < 100) //DHT11会拉低40~80us
{
re++;
Delay_us(1);
};
if(re >= 100)return 1;
else re = 0;
while (!DHT11_PIN_IN && re < 100) //DHT11拉低后会再次拉高40~80us
{
re++;
Delay_us(1);
};
if(re >= 100)return 1;
return 0;
}2.7 读取DHT11一个位
2.7.1 数据位为0的电平信号显示
2.7.2 数据位为1的电平信号显示
cpp
//从DHT11读取一个位
uint8_t DHT11_Read_Bit(void)
{
uint8_t re = 0;
while(DHT11_PIN_IN && re < 110) //等待变为低电平
{
re++;
Delay_us(1);
}
re = 0;
while(!DHT11_PIN_IN && re < 110) //等待变高电平
{
re++;
Delay_us(1);
}
Delay_us(80);//等待40us
if(DHT11_PIN_IN)return 1;
else return 0;
}2.8 读取DHT11一个字节
cpp
//从DHT11读取一个字节
uint8_t DHT11_Read_Byte(void)
{
uint8_t i, dat;
dat = 0;
for (i = 0; i < 8; i++)
{
dat <<= 1;
dat |= DHT11_Read_Bit();
}
return dat;
}2.9 DHT11初始化
cpp
//初始化DHT11的IO口，同时检测DHT11的存在
uint8_t DHT11_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
DHT11_PIN_CLOCK;;
GPIO_InitStruct.Pin = DHT11_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;//推挽输出
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;//告诉
HAL_GPIO_Init(DHT11_PIN_PORT, &GPIO_InitStruct);
DHT11_Rst();//复位
return DHT11_Check();
}2.10 读取DHT11一次数据
cpp
//从DHT11读取一次数据
uint8_t DHT11_Read_Data(uint8_t *temp, uint8_t *humi)
{
uint8_t buf[5];
uint8_t i;
DHT11_Rst();
if(DHT11_Check() == 0)
{
for(i = 0; i < 5; i++)
{
buf[i] = DHT11_Read_Byte();
}
if((buf[0] + buf[1] + buf[2] + buf[3]) == buf[4])
{
*humi = buf[0];
*temp = buf[2];
}
}
else return 1;
return 0;
}3、光敏电阻
3.1 光敏电阻DO
3.1.1 CubeMx配置
3.1.2 初始化光敏电阻DO
cpp
void Photo_DO_Init()
{
/* USER CODE BEGIN ADC2_Init 0 */
/* USER CODE END ADC2_Init 0 */
ADC_ChannelConfTypeDef sConfig = {0};
/* USER CODE BEGIN ADC2_Init 1 */
/* USER CODE END ADC2_Init 1 */
/** Common config
*/
hadc2.Instance = ADC2;
hadc2.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV2;
hadc2.Init.Resolution = ADC_RESOLUTION_12B;
hadc2.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc2.Init.GainCompensation = 0;
hadc2.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc2.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc2.Init.LowPowerAutoWait = DISABLE;
hadc2.Init.ContinuousConvMode = DISABLE;
hadc2.Init.NbrOfConversion = 1;
hadc2.Init.DiscontinuousConvMode = DISABLE;
hadc2.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc2.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc2.Init.DMAContinuousRequests = DISABLE;
hadc2.Init.Overrun = ADC_OVR_DATA_PRESERVED;
hadc2.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc2) != HAL_OK)
{
Error_Handler();
}
/** Configure Regular Channel
*/
sConfig.Channel = ADC_CHANNEL_17;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_640CYCLES_5;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN ADC2_Init 2 */
/* USER CODE END ADC2_Init 2 */
}
void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
if(adcHandle->Instance==ADC2)
{
/* USER CODE BEGIN ADC2_MspInit 0 */
/* USER CODE END ADC2_MspInit 0 */
/* ADC2 clock enable */
__HAL_RCC_ADC12_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/**ADC2 GPIO Configuration
PA4 ------> ADC2_IN17
*/
GPIO_InitStruct.Pin = GPIO_PIN_4;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
/* USER CODE BEGIN ADC2_MspInit 1 */
/* USER CODE END ADC2_MspInit 1 */
}
}3.2 光敏电阻AO
3.2.1 CubeMx配置
3.2.2 初始化光敏电阻AO
cpp
void Photo_AO_Init()
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
/* GPIO Ports Clock Enable */
__HAL_RCC_GPIOF_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
/*Configure GPIO pin : PA3 */
GPIO_InitStruct.Pin = GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
}