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ISO 9141 click

ISO 9141 Click is a compact add-on board that contains a monolithic bus driver with ISO 9141 interface. This board features the L9637, a monolithic integrated circuit containing standard ISO 9141 compatible interface functions from ST Microelectronics.

click Product page

Click library

  • Author : Jelena Milosavljevic
  • Date : Aug 2021.
  • Type : UART type

Software Support

We provide a library for the ISO9141 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 from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Library Description

This library contains API for ISO9141 Click driver.

Standard key functions :

  • iso9141_cfg_setup Config Object Initialization function.
void iso9141_cfg_setup ( iso9141_cfg_t *cfg );
  • iso9141_init Initialization function.
err_t iso9141_init ( iso9141_t *ctx, iso9141_cfg_t *cfg );

Example key functions :

  • iso9141_generic_write This function writes a desired number of data bytes by using UART serial interface.
err_t iso9141_generic_write ( iso9141_t *ctx, char *data_buf, uint16_t len );
  • iso9141_generic_read This function reads a desired number of data bytes by using UART serial interface.
err_t iso9141_generic_read ( iso9141_t *ctx, char *data_buf, uint16_t max_len );
  • iso9141_send_data This function send data.
err_t iso9141_send_data ( iso9141_t *ctx, char *tx_data );

Example Description

This is an example that demonstrates the use of ISO 9141 Click board that contains a monolithic bus driver with ISO 9141 interface.

The demo application is composed of two sections :

Application Init

Initializes UART used for communication and another UART bus used for data logging.

void application_init ( void )
{
    log_cfg_t log_cfg;  /**< Logger config object. */
    iso9141_cfg_t iso9141_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, " \t Application Init \r\n" );
    log_printf( &logger, "-------------------------------------\r\n" );
    log_printf( &logger, "           ISO 9141  click         \r\n" );
    log_printf( &logger, "-------------------------------------\r\n" );

    // Click initialization.
    iso9141_cfg_setup( &iso9141_cfg );
    ISO9141_MAP_MIKROBUS( iso9141_cfg, MIKROBUS_1 );
    err_t init_flag  = iso9141_init( &iso9141, &iso9141_cfg );
    if ( UART_ERROR == init_flag ) {
        log_error( &logger, " Application Init Error. \r\n" );
        log_info( &logger, " Please, run program again... \r\n" );

        for ( ; ; );
    }

    Delay_ms( 100 );
    log_printf( &logger, "   Set app mode:   \r\n" );
    Delay_ms( 100 );

#ifdef TRANSMIT
    log_printf( &logger, "   Transmit data   \r\n" );
    log_printf( &logger, "    Send data:    \r\n" );
    log_printf( &logger, "      MikroE      \r\n" );
    log_printf( &logger, "------------------\r\n" );
    Delay_ms( 1000 );
#elif defined RECEIVER
    log_printf( &logger, "   Receive data  \r\n" );
    Delay_ms( 2000 );
#else
    # error PLEASE SELECT TRANSMIT OR RECEIVE MODE!!!
#endif

    log_printf( &logger, "------------------\r\n" );
}

Application Task

In this example transmitter/Receiver task depend on uncommented code Receiver logging each received byte to the UART for data logging, while transmitted send messages every 2 seconds.

void application_task ( void )
{
#ifdef TRANSMIT
    iso9141_send_data( &iso9141, demo_message_data );
    log_printf( &logger, "\r\n Message Sent : %s \r\n", demo_message_data );
    Delay_ms( 2000 );
    log_printf( &logger, "------------------\r\n" );
#elif defined RECEIVER
    iso9141_process( );

    if ( app_buf_len > 0 ) {
        log_printf( &logger, "%s", app_buf );
        iso9141_clear_app_buf(  );
    }
#else
    # error PLEASE SELECT TRANSMIT OR RECEIVE MODE!!!
#endif
}

The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager(recommended way), downloaded from our LibStock™ or found on Mikroe github account.

Other Mikroe Libraries used in the example:

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.ISO9141

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. UART terminal is available in all MikroElektronika compilers.