sht20中写用户寄存器_STM32F030读取温湿度传感器SHT20的C程序源码(经实测实用过)...

以下是一个参考实现，可以用于读取SHT20的温度和湿度数据。请注意，这只是一个简单的示例代码，可能需要根据具体情况进行调整。

#include "stm32f0xx.h"
#include "delay.h"

#define SHT20_I2C_ADDR 0x80 // SHT20的I2C地址

// SHT20命令定义
#define SHT20_MEASURE_TEMPERATURE_HOLD_MASTER 0xE3 // 测量温度，并等待主机读取数据
#define SHT20_MEASURE_HUMIDITY_HOLD_MASTER 0xE5    // 测量湿度，并等待主机读取数据
#define SHT20_WRITE_USER_REG 0xE6                 // 写用户寄存器
#define SHT20_READ_USER_REG 0xE7                  // 读用户寄存器
#define SHT20_SOFT_RESET 0xFE                      // 软件复位

// I2C相关配置
#define I2C_SCL_PIN GPIO_Pin_9
#define I2C_SDA_PIN GPIO_Pin_10
#define I2C_GPIO_PORT GPIOB
#define I2C_GPIO_CLK RCC_AHBPeriph_GPIOB
#define I2C_RCC_CLK RCC_APB1Periph_I2C1
#define I2C_SPEED 100000 // I2C速率

I2C_InitTypeDef I2C_InitStructure;

// 初始化I2C接口
void I2C_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;
    I2C_DeInit(I2C1);

    RCC_APB1PeriphClockCmd(I2C_RCC_CLK, ENABLE);
    RCC_AHBPeriphClockCmd(I2C_GPIO_CLK, ENABLE);

    GPIO_PinAFConfig(I2C_GPIO_PORT, GPIO_PinSource9, GPIO_AF_1);
    GPIO_PinAFConfig(I2C_GPIO_PORT, GPIO_PinSource10, GPIO_AF_1);

    GPIO_InitStructure.GPIO_Pin = I2C_SCL_PIN | I2C_SDA_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(I2C_GPIO_PORT, &GPIO_InitStructure);

    I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
    I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
    I2C_InitStructure.I2C_OwnAddress1 = 0x00;
    I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
    I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
    I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;
    I2C_Init(I2C1, &I2C_InitStructure);

    I2C_Cmd(I2C1, ENABLE);
}

// 向SHT20发送命令
void SHT20_SendCommand(uint8_t cmd)
{
    while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY))
        ;

    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
        ;

    I2C_Send7bitAddress(I2C1, SHT20_I2C_ADDR, I2C_Direction_Transmitter);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
        ;

    I2C_SendData(I2C1, cmd);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
        ;
}

// 从SHT20读取数据
uint16_t SHT20_ReadData(void)
{
    uint16_t data = 0;
    uint8_t byte1, byte2;

    while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY))
        ;

    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
        ;

    I2C_Send7bitAddress(I2C1, SHT20_I2C_ADDR, I2C_Direction_Receiver);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED))
        ;

    while (I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE) == RESET)
        ;
    byte1 = I2C_ReceiveData(I2C1);

    I2C_AcknowledgeConfig(I2C1, DISABLE);
    while (I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE) == RESET)
        ;
    byte2 = I2C_ReceiveData(I2C1);

    I2C_GenerateSTOP(I2C1, ENABLE);

    data = (byte1 << 8) | byte2;
    return data;
}

// 读取温度
float SHT20_ReadTemperature(void)
{
    float t = 0.0f;
    SHT20_SendCommand(SHT20_MEASURE_TEMPERATURE_HOLD_MASTER);
    delay_ms(80); // 等待测量完成
    uint16_t raw_data = SHT20_ReadData();
    t = -46.85f + 175.72f * ((float)raw_data / (float)0xFFFF);
    return t;
}

// 读取湿度
float SHT20_ReadHumidity(void)
{
    float h = 0.0f;
    SHT20_SendCommand(SHT20_MEASURE_HUMIDITY_HOLD_MASTER);
    delay_ms(80); // 等待测量完成
    uint16_t raw_data = SHT20_ReadData();
    h = -6.0f + 125.0f * ((float)raw_data / (float)0xFFFF);
    return h;
}

// 写用户寄存器
void SHT20_WriteUserRegister(uint8_t value)
{
    SHT20_SendCommand(SHT20_WRITE_USER_REG);
    I2C_SendData(I2C1, value);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED))
        ;
}

// 读用户寄存器
uint8_t SHT20_ReadUserRegister(void)
{
    uint8_t data = 0;
    SHT20_SendCommand(SHT20_READ_USER_REG);

    while (I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY))
        ;

    I2C_GenerateSTART(I2C1, ENABLE);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT))
        ;

    I2C_AcknowledgeConfig(I2C1, DISABLE);
    I2C_Send7bitAddress(I2C1, SHT20_I2C_ADDR, I2C_Direction_Receiver);
    while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_RECEIVED))
        ;
    data = I2C_ReceiveData(I2C1);

    I2C_GenerateSTOP(I2C1, ENABLE);

    return data;
}

int main(void)
{
    float temperature, humidity;

    I2C_Configuration();
    SHT20_WriteUserRegister(0x00); // 设置SHT20的用户寄存器
    temperature = SHT20_ReadTemperature();
    humidity = SHT20_ReadHumidity();

    while (1)
        ;
}