Trying to connect hm-3301 pm2.5 sensor to raspberry pi

Products & Technology Grove
#1

hi , new here ,
i am trying to connect hm-3301 sensor to raspberry pi

pi@raspberrypi:~ $ uname -a
Linux raspberrypi 5.15.61-v7+ #1579 SMP Fri Aug 26 11:10:59 BST 2022 armv7l GNU/Linux

i want to do it under c/c++
what i have done so far is as below.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <unistd.h>
#include <time.h>
#include <wiringPiI2C.h>
#include <wiringPi.h>

#define PM25_I2CADDR 0x40

typedef struct PMSAQIdata
{
    u_int16_t framelen;       ///< How long this data chunk is
    u_int16_t pm10_standard,  ///< Standard PM1.0
        pm25_standard,       ///< Standard PM2.5
        pm100_standard;      ///< Standard PM10.0
    u_int16_t pm10_env,       ///< Environmental PM1.0
        pm25_env,            ///< Environmental PM2.5
        pm100_env;           ///< Environmental PM10.0
    u_int16_t particles_03um, ///< 0.3um Particle Count
        particles_05um,      ///< 0.5um Particle Count
        particles_10um,      ///< 1.0um Particle Count
        particles_25um,      ///< 2.5um Particle Count
        particles_50um,      ///< 5.0um Particle Count
        particles_100um;     ///< 10.0um Particle Count
    u_int16_t unused;         ///< Unused
    u_int16_t checksum;       ///< Packet checksum
} PM25_AQI_Data;


// Send the command to set i2c communication
bool select_comm(int handle)
{
    int i = wiringPiI2CWriteReg8(handle, 0x80, 0x88);
    //int i = wiringPiI2CWrite(handle, 0x88);
    printf("device write: %d \n", i);
    return i > 0;
}

int pm25_init()
{
    int pm = wiringPiI2CSetup(PM25_I2CADDR);
    printf("device handle: %d \n", pm);
	
    if (!select_comm(pm))
    {
        printf("Failed to set i2c communication\n");
        return -1;
    }

    return pm;
}

bool pm_read(int handle, PM25_AQI_Data *data)
{
    u_int16_t sum = 0;
    u_int8_t buffer[32];
    // wiringPiI2CWrite(handle, 0x81);
    read(handle, &buffer, 32);
    if (buffer[0] != 0x42)
    {
            printf("First byte miss match\n");
        return false;
    }
    for (u_int8_t i = 0; i < 30; i++)
    {
        sum += buffer[i];
        printf("byte : %d | data : %d \n", i, buffer[i]);
    }
    // The data comes in endian'd, this solves it so it works on all platforms
    u_int16_t buffer_u16[15];
    for (u_int8_t i = 0; i < 15; i++)
    {
        buffer_u16[i] = buffer[2 + i * 2 + 1];
        buffer_u16[i] += (buffer[2 + i * 2] << 8);
    }

    // put it into a nice struct :)
    memcpy((void *)data, (void *)buffer_u16, 30);

    if (sum != data->checksum)
    {
            printf("checksome error\n");
        return false;
    }

    // success!
    return true;
}

int main(int argc, char *argv[])
{
    wiringPiSetup();

    int pm = pm25_init();

    if (pm == -1)
    {
        printf("failed to initialize HM3301 \n");
        return 1;
    }
    else
    {
        printf("HM3301 device handle: %d \n", pm);
    }

    PM25_AQI_Data pmdata;

    int times = 10;
    while (times > 0)
    {
        if (!pm_read(pm, &pmdata))
        {
            printf("Could not read from AQI\n");
        }
        else
        {
            printf("PM 1.0: %d ", pmdata.pm10_standard);
            printf("\tPM 2.5: %d ", pmdata.pm25_standard);
            printf("\tPM 10: %d \n", pmdata.pm100_standard);
        }
        times--;
        sleep(1);
    }

}

but i am unable to communicate with the sensor properly.

pi@raspberrypi:~ $ gcc pmtest.c -lwiringPi -o pmtest
pi@raspberrypi:~ $ ./pmtest 
device handle: 4 
device write: 0 
Failed to set i2c communication
failed to initialize HM3301 
pi@raspberrypi:~ $

any help will be appreciated.