The library carries generic functions, necessary for communication with the module. 

Key functions:

obdII_sendCommand- Sends provided command to the module

obdII_readResponse - Reads current response inside buffer

obdII_process- State machine function. This function is being called frequently

Examples Description

The example demonstrates how to read RPM from your vehicle. 
 

• System Initialization - Initializes UART module and GPIO pins
• Application Initialization - Powers on the module and sets it to Automatic protocol detection by sending "ATSP0"
• Application Task - (code snippet) - Sequentially sends command for RPM and converts read response to a valid RPM value

void applicationTask()
{
    uint8_t tmp[ 25 ];

    obdII_sendCommand( &RPM_CMD[0] );
    while( !obdII_responseReady() )
        ;
    obdII_readResponse( &rsp[0] );

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

    mikrobus_logWrite( "Current RPM : ", _LOG_TEXT );
    mikrobus_logWrite( tmp, _LOG_LINE );
}

Note that not all vehicles use the same set of commands - it might happen that routine for reading RPM on your vehicle is not the same as the ones provided in the example.

Other MikroElektronika libraries used in the example:
 

• Conversions
• String
• Stdlib

Additional notes and information

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.