obdii

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OBDII Click

OBDII Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

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Click Library

• Author : Stefan Filipovic
• Date : Jul 2023.
• Type : UART type

Software Support

Example Description

This example demonstrates the use of OBDII Click board by reading the engine RPM and vehicle speed and displaying results on the USB UART.

Example Libraries

• MikroSDK.Board
• MikroSDK.Log
• Click.OBDII

Example Key Functions

• obdii_cfg_setup Config Object Initialization function.

void obdii_cfg_setup ( obdii_cfg_t *cfg );

• obdii_init Initialization function.

err_t obdii_init ( obdii_t *ctx, obdii_cfg_t *cfg );

• obdii_send_command This function sends command string by using UART serial interface.

void obdii_send_command ( obdii_t *ctx, uint8_t *cmd );

• obdii_generic_read This function reads a desired number of data bytes by using UART serial interface.

err_t obdii_generic_read ( obdii_t *ctx, uint8_t *data_out, uint16_t len );

• obdii_reset_device This function resets the device by toggling the RST pin.

void obdii_reset_device ( obdii_t *ctx );

Application Init

Initializes the driver and performs the Click default configuration.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    obdii_cfg_t obdii_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.
    obdii_cfg_setup( &obdii_cfg );
    OBDII_MAP_MIKROBUS( obdii_cfg, MIKROBUS_POSITION_OBDII );
    if ( UART_ERROR == obdii_init( &obdii, &obdii_cfg ) ) 
    {
        log_error( &logger, " Communication init." );
        for ( ; ; );
    }
    obdii_reset_device ( &obdii );
    
    obdii_process ( &obdii );
    obdii_clear_app_buf ( );
    
    log_printf( &logger, "> Reset device\r\n" );
    obdii_send_command ( &obdii, OBDII_CMD_RESET_DEVICE );
    obdii_rsp_check ( &obdii, OBDII_RSP_PROMPT );
    obdii_log_app_buf ( );
    Delay_ms ( 1000 );
    
    log_printf( &logger, " Disable echo\r\n" );
    obdii_send_command ( &obdii, OBDII_CMD_DISABLE_ECHO );
    obdii_rsp_check ( &obdii, OBDII_RSP_PROMPT );
    obdii_log_app_buf ( );
    
    log_printf( &logger, " Remove spaces\r\n" );
    obdii_send_command ( &obdii, OBDII_CMD_SPACES_OFF );
    obdii_rsp_check ( &obdii, OBDII_RSP_PROMPT );
    obdii_log_app_buf ( );
}

Application Task

Reads and processes the engine RPM and vehicle speed and displays the results on the USB UART once per second.

void application_task ( void )
{
    uint8_t * __generic_ptr start_ptr = NULL;
    uint8_t data_buf[ 5 ] = { 0 };
    uint16_t rpm = 0;
    uint8_t speed = 0;
    
    log_printf( &logger, " Get current RPM\r\n" );
    obdii_send_command ( &obdii, OBDII_CMD_GET_CURRENT_RPM );
    obdii_rsp_check ( &obdii, OBDII_RSP_PROMPT );
    start_ptr = strstr( app_buf, OBDII_RSP_CURRENT_RPM );
    if ( start_ptr )
    {
        memcpy ( data_buf, ( start_ptr + 4 ), 4 );
        data_buf[ 4 ] = 0;
        rpm = hex_to_uint16( data_buf ) / 4;
        log_printf( &logger, "RPM: %u\r\n\n>", rpm );
    }
    else
    {
        obdii_log_app_buf ( );
    }
    
    log_printf( &logger, " Get current speed\r\n" );
    obdii_send_command ( &obdii, OBDII_CMD_GET_CURRENT_SPEED );
    obdii_rsp_check ( &obdii, OBDII_RSP_PROMPT );
    start_ptr = strstr( app_buf, OBDII_RSP_CURRENT_SPEED );
    if ( start_ptr )
    {
        memcpy ( data_buf, ( start_ptr + 4 ), 2 );
        data_buf[ 2 ] = 0;
        speed = hex_to_uint8( data_buf );
        log_printf( &logger, "Speed: %u km/h\r\n\n>", ( uint16_t ) speed );
    }
    else
    {
        obdii_log_app_buf ( );
    }
    Delay_ms ( 1000 );
}

Application Output

This Click board can be interfaced and monitored in two ways:

• Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
• UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.

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