AutomationHatRead.c

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/*
 *  Copyright (C) 2023 Swansea University
 *
 *  This file is part of the SELKIELogger suite of tools.
 *
 *  SELKIELogger is free software: you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the Free
 *  Software Foundation, either version 3 of the License, or (at your option)
 *  any later version.
 *
 *  SELKIELogger is distributed in the hope that it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 *  more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with this SELKIELogger product.
 *  If not, see <http://www.gnu.org/licenses/>.
*/
 
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
 
#include "SELKIELoggerI2C.h"
 
int main(void) {
    int handle = i2c_openConnection("/dev/i2c-1");
 
    if (handle < 0) {
        fprintf(stderr, "Unable to open I2C bus: %s\n", strerror(errno));
        return EXIT_FAILURE;
    }
 
    const float cfact = 7.88842;
    i2c_ads1015_options opts = I2C_ADS1015_DEFAULTS;
    opts.pga = ADS1015_CONFIG_PGA_4096MV;
 
    // clang-format off
    float ch0 = i2c_ads1015_read_mux(handle, ADS1015_ADDR_DEFAULT, ADS1015_CONFIG_MUX_SINGLE_0, &opts);
    float ch1 = i2c_ads1015_read_mux(handle, ADS1015_ADDR_DEFAULT, ADS1015_CONFIG_MUX_SINGLE_1, &opts) * cfact;
    float ch2 = i2c_ads1015_read_mux(handle, ADS1015_ADDR_DEFAULT, ADS1015_CONFIG_MUX_SINGLE_2, &opts) * cfact;
    float ch3 = i2c_ads1015_read_mux(handle, ADS1015_ADDR_DEFAULT, ADS1015_CONFIG_MUX_SINGLE_3, &opts) * cfact;
    // clang-format on
 
    float delta_1_3 = i2c_ads1015_read_diff_ch1_ch3(handle, ADS1015_ADDR_DEFAULT, &opts);
    float delta_2_3 = i2c_ads1015_read_diff_ch2_ch3(handle, ADS1015_ADDR_DEFAULT, &opts);
 
    fprintf(stdout, "Single shot conversion on all mux options:\n");
 
    fprintf(stdout, "Channel 0:\t%+.3f mV\n", ch0);
    fprintf(stdout, "Channel 1:\t%+.3f mV\n", ch1);
    fprintf(stdout, "Channel 2:\t%+.3f mV\n", ch2);
    fprintf(stdout, "Channel 3:\t%+.3f mV\n", ch3);
 
    fprintf(stdout, "Ch1 - Ch3:\t%+.3f mV\n", delta_1_3);
    fprintf(stdout, "Ch2 - Ch3:\t%+.3f mV\n", delta_2_3);
 
    i2c_closeConnection(handle);
    return 0;
}