Say hello to clean air with ZMOD4510 and STM32L073RZ

/*!
 * @file main.c
 * @brief AirQuality8 Click example
 *
 * # Description
 * This library contains API for Air Quality 8 Click driver.
 * The library initializes and defines the I2C bus drivers 
 * to write and read data from registers. 
 * The library also includes a function for configuring sensor and measurement, 
 * read and calculate mox resistance ( RMOX ) and air quality index ( AQI ), etc.
 *
 * The demo application is composed of two sections :
 *
 * ## Application Init
 * Initialization of I2C module and log UART, and additional pins.
 * After the driver inits and executes a default configuration, 
 * the app read product ID and configuration parameters, 
 * initializes the sensor and measurement.
 *
 * ## Application Task
 * This is an example that demonstrates the use of the Air Quality 8 Click board™.
 * In this example, the app performs the start of the measurement,
 * reads an array of the 15 mox resistances measurements ( RMOX ), 
 * and calculates the air quality index ( AQI ), the app also, displays if an error occurs.
 * Results are being sent to the Usart Terminal where you can track their changes.
 *
 * ## Additional Function
 * - static void display_error ( void )
 *
 * @author Nenad Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "airquality8.h"

static airquality8_t airquality8;
static log_t logger;
static uint16_t mox_lr;
static uint16_t mox_er;
static uint8_t status_flag;

static void display_error ( void )
{
    if ( status_flag == AIRQUALITY8_ERROR_INIT_OUT_OF_RANGE )
    {
        log_printf( &logger, " The initialize value is out of range.\r\n" );
    }
    
    if ( status_flag == AIRQUALITY8_ERROR_GAS_TIMEOUT )
    {
        log_printf( &logger, " The operation took too long.\r\n" );
    }
    
    if ( status_flag == AIRQUALITY8_ERROR_I2C )
    {
        log_printf( &logger, " Failure in i2c communication.\r\n" );
    }
    
    if ( status_flag == AIRQUALITY8_ERROR_SENSOR_UNSUPPORTED )
    {
        log_printf( &logger, " Sensor is not supported with this firmware.\r\n" );
    }
    
    if ( status_flag == AIRQUALITY8_ERROR_CONFIG_MISSING )
    {
        log_printf( &logger, " There is no pointer to a valid configuration.\r\n" );
    }
    
    if ( status_flag == AIRQUALITY8_ERROR_SENSOR )
    {
        log_printf( &logger, " Sensor malfunction.\r\n" );
    }
}

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    airquality8_cfg_t airquality8_cfg;  /**< Click config object. */

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, " Application Init " );

    // Click initialization.
    airquality8_cfg_setup( &airquality8_cfg );
    AIRQUALITY8_MAP_MIKROBUS( airquality8_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == airquality8_init( &airquality8, &airquality8_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( AIRQUALITY8_ERROR == airquality8_default_cfg ( &airquality8 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }
    Delay_ms( 100 );
    
    static uint8_t cfg_data[ 6 ];
    static uint8_t prod_data[ 5 ];
    static uint16_t pid;
    
    airquality8_get_sensor_info( &airquality8, &cfg_data[ 0 ], &prod_data[ 0 ], &pid );
    
    if ( pid != AIRQUALITY8_PRODUCT_ID )
    {
        status_flag = AIRQUALITY8_ERROR_I2C;
        display_error( );
        for ( ; ; );
    }
    Delay_ms( 100 );
    
    log_printf( &logger, "---------------------------\r\n" );
    log_printf( &logger, " Product ID : 0x%.2X  \r\n", pid );
    Delay_ms( 100 );
    
    airquality8_init_sensor( &airquality8, &mox_lr, &mox_er );
    Delay_ms( 10 );
    
    airquality8_init_measurement( &airquality8 );
    Delay_ms( 10 );
    
    log_printf( &logger, "---------------------------\r\n" );
    log_info( &logger, " Application Task " );
    log_printf( &logger, "---------------------------\r\n" );
    log_printf( &logger, "      Air Quality Index\r\n" );
    log_printf( &logger, "- - - - - - - - - - - - - -\r\n" );
    Delay_ms( 100 );
}

void application_task ( void ) 
{   
    static uint8_t status_data;
    static float rmox;
    static float rmox_seq[ 15 ];
    static float aqi;
    
    status_flag = airquality8_start_measurement( &airquality8 );

    airquality8_get_status( &airquality8, &status_data );
    Delay_ms( 10 );
    
    while ( ( status_data & AIRQUALITY8_STATUS_LAST_SEQ_STEP_MASK ) != AIRQUALITY8_OK )
    {
        airquality8_get_status( &airquality8, &status_data );
        Delay_ms( 10 );
    }

    for ( uint8_t n_cnt = 0; n_cnt < 15; n_cnt++ )
    {        
        status_flag = airquality8_read_rmox( &airquality8, &rmox, mox_lr, mox_er );
        rmox_seq[ n_cnt ] = rmox;
        Delay_ms( 100 ); 
        
        if ( status_flag != AIRQUALITY8_OK )
        {
            display_error( );
        }
    }       
    
    aqi = airquality8_calc_oaq( rmox_seq, AIRQUALITY8_RCDA_STRATEGY_ADJ, AIRQUALITY8_GAS_DETECTION_STRATEGY_AUTO );
    log_printf( &logger, " \tAQI : %.3f \r\n", aqi );
    log_printf( &logger, "---------------------------\r\n" );
    Delay_ms( 1000 );
}

void main ( void ) 
{
    application_init( );

    for ( ; ; ) 
    {
        application_task( );
    }
}

// ------------------------------------------------------------------------ END