Measure distances within the 20- to 500cm range with TMF8806-1A and ATmega328

/*!
 * @file main.c
 * @brief LightRanger 13 Click example
 *
 * # Description
 * This application demonstrates the usage of the LightRanger 13 Click for distance
 * measurement and monitoring.
 *
 * The demo application is composed of two sections:
 *
 * ## Application Init
 * Initializes the logger and LightRanger 13 Click with default configuration,
 * displays device information, performs factory calibration (if enabled), and sets up
 * distance measurement thresholds (1mm-1000mm) with persistence (5 consecutive times)
 * to ensure reliable readings. It then starts the measurement process.
 *
 * ## Application Task
 * Waits for the data ready interrupt signal, indicating a new measurement is available.
 * Upon receiving the signal, it reads the distance and temperature data from the sensor
 * and logs the values to USB UART.
 *
 * @note
 * The factory calibration step can be enabled or disabled by commenting/uncommenting
 * the `FACTORY_CALIBRATION_DISABLE` macro.
 *
 * @author Stefan Filipovic
 *
 */

#include "board.h"
#include "log.h"
#include "lightranger13.h"

// Comment out the line below to enable factory calibration
#define FACTORY_CALIBRATION_DISABLE

static lightranger13_t lightranger13;
static log_t logger;

void application_init ( void ) 
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    lightranger13_cfg_t lightranger13_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.
    lightranger13_cfg_setup( &lightranger13_cfg );
    LIGHTRANGER13_MAP_MIKROBUS( lightranger13_cfg, MIKROBUS_1 );
    if ( I2C_MASTER_ERROR == lightranger13_init( &lightranger13, &lightranger13_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    
    if ( LIGHTRANGER13_ERROR == lightranger13_default_cfg ( &lightranger13 ) )
    {
        log_error( &logger, " Default configuration." );
        for ( ; ; );
    }

    log_printf( &logger, "--- DEVICE INFO ---\r\n" );
    log_printf( &logger, " App version: %u.%u.%u.%u\r\n",
                ( uint16_t ) lightranger13.info.app_ver[ 0 ], 
                ( uint16_t ) lightranger13.info.app_ver[ 1 ], 
                ( uint16_t ) lightranger13.info.app_ver[ 2 ], 
                ( uint16_t ) lightranger13.info.app_ver[ 3 ] );
    log_printf( &logger, " Chip version: %u.%u\r\n",
                ( uint16_t ) lightranger13.info.chip_ver[ 0 ], 
                ( uint16_t ) lightranger13.info.chip_ver[ 1 ] );
    log_printf( &logger, " Serial number: %.8LX\r\n\n", lightranger13.info.serial_num );
    Delay_ms ( 1000 );

#ifndef FACTORY_CALIBRATION_DISABLE
    log_printf( &logger, "--- FACTORY CALIBRATION ---\r\n" );
    log_printf( &logger, " Calibration environment:\r\n" );
    log_printf( &logger, " - Device has to be in the final (correct) optical stack\r\n" );
    Delay_ms ( 10 );
    log_printf( &logger, " - Cover glass (no smudge on the glass) in front of the device\r\n" );
    log_printf( &logger, " - No target in front of the device within 40cm\r\n" );
    log_printf( &logger, " - Dark room or low ambient light\r\n" );
    log_printf( &logger, " Performing factory calibration in 5 seconds...\r\n" );
    for ( uint8_t cnt = 5; cnt > 0; cnt-- )
    {
        log_printf( &logger, " %u\r\n", ( uint16_t ) cnt );
        Delay_ms ( 1000 );
    }
    if ( LIGHTRANGER13_ERROR == lightranger13_factory_calib ( &lightranger13 ) )
    {
        log_error( &logger, " Factory calibration." );
        for ( ; ; );
    }
    log_printf( &logger, " Factory calibration DONE.\r\n\n" );
    Delay_ms ( 1000 );
#endif

    log_printf( &logger, "--- THRESHOLD AND PERSISTANCE ---\r\n" );
    log_printf( &logger, " Setting threshold: 1mm-1000mm; and persistance: 5 times\r\n" );
    if ( LIGHTRANGER13_ERROR == lightranger13_set_threshold ( &lightranger13, 1, 1000, 5 ) )
    {
        log_error( &logger, " Set threshold." );
        for ( ; ; );
    }
    log_printf( &logger, " Set threshold DONE.\r\n\n" );
    Delay_ms ( 1000 );

    log_printf( &logger, "--- STARTING MEASUREMENT ---\r\n" );
    if ( LIGHTRANGER13_ERROR == lightranger13_start_measurement ( &lightranger13 ) )
    {
        log_error( &logger, " Start measurement." );
        for ( ; ; );
    }
    log_printf( &logger, " Measurement started.\r\n\n" );
    Delay_ms ( 1000 );
    
    log_info( &logger, " Application Task " );
}

void application_task ( void ) 
{
    lightranger13_meas_result_t result;
    // Wait for data ready interrupt
    while ( lightranger13_get_int_pin ( &lightranger13 ) );

    lightranger13_clear_interrupts ( &lightranger13 );
    
    if ( LIGHTRANGER13_OK == lightranger13_read_result ( &lightranger13, &result ) )
    {
        log_printf( &logger, " Distance: %u mm\r\n", result.dist_peak );
        log_printf( &logger, " Temperature: %d degC\r\n\n", ( int16_t ) result.temperature );
    }
}

int main ( void ) 
{
    /* Do not remove this line or clock might not be set correctly. */
    #ifdef PREINIT_SUPPORTED
    preinit();
    #endif
    
    application_init( );
    
    for ( ; ; ) 
    {
        application_task( );
    }

    return 0;
}

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