SCD_SCD/SCDV3/applications/peri/iic/sht30.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2023-04-17     19813       the first version
 */

/*********************↓           define           ↓************************/

#define IIC_SHT30 IIC1

/*********************↑           define           ↑************************/
/**
 *
 *
 *
 *
 * */
/*********************↓           include           ↓************************/

#include "sht30.h"

/*********************↑           include           ↑************************/
/**
 *
 *
 *
 *
 * */
/*********************↓           extern           ↓************************/

/*********************↑           extern           ↑************************/
/**
 *
 *
 *
 *
 * */
/********************↓           declaration          ↓***********************/

/********************↑           declaration          ↑***********************/
/**
 *
 *
 *
 *
 * */
/*********************↓        global variables      ↓************************/

/*********************↑        global variables      ↑************************/
/**
 *
 *
 *
 *
 * */

/**
 * @brief 接口初始化
 *
 */
void SHT30_Init(void)
{
    IIC_Init(IIC_SHT30);
}

// SHT30周期读取初始化
unsigned char tem_hum_per_init(void)
{

    rt_thread_mdelay(10);

    IIC_Start(IIC_SHT30);

    IIC_WriteByte(IIC_SHT30, TEM_HUM_ADDR);

    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }

    IIC_WriteByte(IIC_SHT30, ((CMD_MEAS_PERI_4_M >> 8) & 0x00FF));
    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }
    IIC_WriteByte(IIC_SHT30, CMD_MEAS_PERI_4_M & 0x00FF);
    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }

    IIC_Stop(IIC_SHT30);

    return 0;
}

// SHT30单次读取初始化
unsigned char tem_hum_single_init()
{
    IIC_Start(IIC_SHT30);

    IIC_WriteByte(IIC_SHT30, TEM_HUM_ADDR);

    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }

    IIC_WriteByte(IIC_SHT30, ((CMD_MEAS_POLLING_L >> 8) & 0x00FF));
    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }
    IIC_WriteByte(IIC_SHT30, CMD_MEAS_POLLING_L & 0x00FF);
    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }

    IIC_Stop(IIC_SHT30);

    return 0;
}

// SHT30结束读取
unsigned char tem_hum_stop()
{
    IIC_Start(IIC_SHT30);

    IIC_WriteByte(IIC_SHT30, TEM_HUM_ADDR);

    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }

    IIC_WriteByte(IIC_SHT30, ((CMD_STOP_MEAS_PERI >> 8) & 0x00FF));
    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }
    IIC_WriteByte(IIC_SHT30, CMD_STOP_MEAS_PERI & 0x00FF);
    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }

    IIC_Stop(IIC_SHT30);

    return 0;
}

// 读取SHT30温湿度值
unsigned char tem_hum_read(int *temp, int *hump)
{

    int Temp01 = 0, Humi01 = 0;

    uint8_t data[10] = {0};

    IIC_Start(IIC_SHT30);
    IIC_WriteByte(IIC_SHT30, TEM_HUM_ADDR + 1);

    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }

    // 前五次读取都要发送ack信号，最后一次就不用发了。


    IIC_DevReadBuf(IIC_SHT30 , 0 , data , 6);


//    data[0] = IIC_MultipleReadByte(IIC_SHT30);
//    data[1] = IIC_MultipleReadByte(IIC_SHT30);
//    data[2] = IIC_MultipleReadByte(IIC_SHT30);
//    data[3] = IIC_MultipleReadByte(IIC_SHT30);    //可见读buf是没问题的
//    data[4] = IIC_MultipleReadByte(IIC_SHT30);
//    data[5] = IIC_ReadByte(IIC_SHT30);

    if (data[2] != crc8_checksum(data, 2))
    {
        return 1;
    }

    if (data[5] != crc8_checksum(data + 3, 2))
    {
        return 1;
    }
    //
    IIC_Stop(IIC_SHT30);

    Temp01 = (int)((((((data[0] * 256.0) + data[1]) * 175) / 65535.0) - 45) * 10);

    Humi01 = (int)(((((data[3] * 256.0) + data[4]) * 100) / 65535.0) * 10);

    // rt_kprintf("Temp %d , Humi %d \n", Temp01, Humi01);

    *temp = Temp01;
    *hump = Humi01;

    return 0;
}

// 读取SHT30状态
unsigned char tem_hum_read_sensor_status(unsigned char *data)
{
    IIC_Start(IIC_SHT30);

    IIC_WriteByte(IIC_SHT30, TEM_HUM_ADDR);

    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }

    IIC_WriteByte(IIC_SHT30, ((CMD_READ_STATUS >> 8) & 0x00FF));
    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }
    IIC_WriteByte(IIC_SHT30, CMD_READ_STATUS & 0x00FF);
    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }

    IIC_Start(IIC_SHT30);
    IIC_WriteByte(IIC_SHT30, TEM_HUM_ADDR + 1);

    if (IIC_Wait_Ask(IIC_SHT30) == 1)
    {
        return 1;
    }

    // 前五次读取都要发送ack信号，最后一次就不用发了。
    data[0] = IIC_ReadByte(IIC_SHT30);
    data[1] = IIC_ReadByte(IIC_SHT30);
    data[2] = IIC_ReadByte(IIC_SHT30);
    ;

    if (data[2] != crc8_checksum(data, 2))
    {
        return 1;
    }

    //
    IIC_Stop(IIC_SHT30);

    return 0;
}

// SHT30 CRC校验
unsigned char crc8_checksum(unsigned char *ptr, unsigned char len)
{
    unsigned char bit;        // bit mask
    unsigned char crc = 0xFF; // calculated checksum
    unsigned char byteCtr;    // byte counter

    // calculates 8-Bit checksum with given polynomial
    for (byteCtr = 0; byteCtr < len; byteCtr++)
    {
        crc ^= (ptr[byteCtr]);
        for (bit = 8; bit > 0; --bit)
        {
            if (crc & 0x80)
                crc = (crc << 1) ^ 0x131;
            else
                crc = (crc << 1);
        }
    }

    return crc;
}

/**
 * @brief 对外接口 读取温湿度
 *
 * @param temp 温度指针
 * @param hump 湿度指针
 * @return uint8_t 0 成功 1失败
 */
uint8_t SHT30_Read(int *temp, int *hump)
{

    if (tem_hum_single_init() != 0)
    {
        return 1;
    }
    rt_thread_mdelay(10);

    if (tem_hum_read(temp, hump) != 0)
    {
        return 1;
    }
    rt_thread_mdelay(10);

    if (tem_hum_stop() != 0)
    {
        return 1;
    }

    return 0;
}

/**
 * @brief 确认传感器是否在线
 *
 * @return uint8_t
 */
uint8_t SHT30_AddrCheck(void)
{
    uint8_t readaddr = 0;
    if (IIC_AddrCheck(IIC_SHT30 , &readaddr) == 0)
    {
        return 0;
    }
    //rt_kprintf("SHT30_AddrCheck fail  %X\n",readaddr);
    return 1;
}