CAN Isolator 2 Click

CAN Isolator 2 Click is a compact add-on board that provides isolated CAN communication. This board features the ISO1042, an isolated CAN transceiver from Texas Instruments. This galvanically-isolated CAN transceiver meets the ISO11898-2 specifications and offers a +/-70V DC bus fault protection, along with the +/-30V of common mode voltage range. The transceiver supports two CAN modes, with speeds of up to 1Mbps in Classic CAN and flexible data rate (FD) CAN, which allows much faster transfer of payload compared to the classic CAN with up to 5Mbps.

Click Product page

Click library

• Author : Nenad Filipovic
• Date : May 2021.
• Type : UART type

Software Support

We provide a library for the CanIsolator2 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 CanIsolator2 Click driver.

Standard key functions :

• canisolator2_cfg_setup Config Object Initialization function.

  void canisolator2_cfg_setup ( canisolator2_cfg_t *cfg );

• canisolator2_init Initialization function.

  CANISOLATOR2_RETVAL canisolator2_init ( canisolator2_t *ctx, canisolator2_cfg_t *cfg );

• canisolator2_default_cfg Click Default Configuration function.

  void canisolator2_default_cfg ( canisolator2_t *ctx );

Example key functions :

• canisolator2_generic_write CAN Isolator 2 data writing function.

  err_t canisolator2_generic_write ( canisolator2_t *ctx, char *data_buf, uint16_t len );

• canisolator2_generic_read CAN Isolator 2 data reading function.

  err_t canisolator2_generic_read ( canisolator2_t *ctx, char *data_buf, uint16_t max_len );

• canisolator2_send_data CAN Isolator 2 send data function.

  err_t canisolator2_send_data ( canisolator2_t *ctx, char *tx_data );

Example Description

This example reads and processes data from CAN Isolator 2 clicks.

The demo application is composed of two sections :

Application Init

Initializes driver and wake-up module.

void application_init ( void ) {
    log_cfg_t log_cfg;                    /**< Logger config object. */
    canisolator2_cfg_t canisolator2_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.

    canisolator2_cfg_setup( &canisolator2_cfg );
    CANISOLATOR2_MAP_MIKROBUS( canisolator2_cfg, MIKROBUS_1 );
    err_t init_flag  = canisolator2_init( &canisolator2, &canisolator2_cfg );
    if ( init_flag == UART_ERROR ) {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

    canisolator2_default_cfg ( &canisolator2 );
    app_buf_len = 0;
    app_buf_cnt = 0;
    log_info( &logger, " Application Task " );
    Delay_ms ( 100 );

    #ifdef TRANSMIT

        log_printf( &logger, "    Send data:    \r\n" );
        log_printf( &logger, "      MikroE      \r\n" );
        log_printf( &logger, "------------------\r\n" );
        log_printf( &logger, "  Transmit data   \r\n" );
        Delay_ms ( 1000 );

    #endif

    #ifdef RECIEVER

        log_printf( &logger, "   Receive data  \r\n" );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );

    #endif

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

Application Task

Transmitter/Receiver task depends 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

        canisolator2_send_data( &canisolator2, demo_message );
        log_printf( &logger, "\t%s", demo_message );
        Delay_ms ( 1000 );
        Delay_ms ( 1000 );
        log_printf( &logger, "------------------\r\n" );    

    #endif

    #ifdef RECIEVER

        canisolator2_process( );

        if ( app_buf_len > 0 ) {
            log_printf( &logger, "%s", app_buf );
            canisolator2_clear_app_buf(  );
        }

    #endif
}

Additional Function

• canisolator2_clear_app_buf CAN Isolator 2 clear app buffer function.

  static void canisolator2_clear_app_buf ( void );

• canisolator2_process CAN Isolator 2 process function.

  static err_t canisolator2_process ( void );

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.CanIsolator2

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.