obdii

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OBDII click

OBDII click offers a unique opportunity to tap into the car diagnostic systems.

click Product page

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Click library

• Author : MikroE Team
• Date : Jun 2020.
• Type : UART GPS/GNSS type

Software Support

We provide a library for the Obdii Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Obdii Click driver.

Standard key functions :

• Config Object Initialization function.

void obdii_cfg_setup ( obdii_cfg_t *cfg );

• Initialization function.

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

Example key functions :

• Reset module.

void obdii_module_reset ( obdii_t *ctx );

• Generic read function.

uint16_t obdii_generic_read ( obdii_t *ctx, char *data_buf, uint16_t max_len );

• Function for send command.

void obdii_send_command ( obdii_t *ctx, char *command );

Examples Description

This example reads and processes data from OBDII clicks.

The demo application is composed of two sections :

Application Init

Initializes driver and reset module.

void application_init ( void )
{
    log_cfg_t log_cfg;
    obdii_cfg_t cfg;

    //  Logger initialization.

    LOG_MAP_USB_UART( log_cfg );
    log_cfg.level = LOG_LEVEL_DEBUG;
    log_cfg.baud = 9600;
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );

    //  Click initialization.

    obdii_cfg_setup( &cfg );
    OBDII_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    obdii_init( &obdii, &cfg );
    obdII_send_command( &obdii, OBDII_AUTOMODE );
    obdii_process( );

    log_printf( &logger, "OBD II initialized \r\n" );
}
  

Application Task

Reads the received data.

void application_task ( void )
{
    uint8_t tmp[ 25 ];

    obdII_send_command( &obdii, RPM_CMD );
    obdii_process( );
        

    memcpy( &tmp[0], &current_parser_buf[11], 4 );
    tmp[5] = 0;
    rpm = xtoi( &tmp[0] );
    rpm = rpm / 4;

    log_printf( &logger, "Current RPM : %d\r\n", rpm );

    Delay_ms( 1000 );

    obdii_process( );
}

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Obdii

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.

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