CAN Bus click

CAN Bus Click is a compact add-on board that provides a link between the CAN protocol controller and the physical wires of the bus lines in a control area network (CAN). This board features the MAX13054, an industry-standard, high-speed CAN transceiver with extended ±80V fault protection from Maxim Integrated.

click Product page

Click library

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

Software Support

We provide a library for the CanBus 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 CanBus Click driver.

Standard key functions :

• canbus_cfg_setup Config Object Initialization function.

  void canbus_cfg_setup ( canbus_cfg_t *cfg );

• canbus_init Initialization function.

  CANBUS_RETVAL canbus_init ( canbus_t *ctx, canbus_cfg_t *cfg );

• canbus_default_cfg Click Default Configuration function.

  void canbus_default_cfg ( canbus_t *ctx );

Example key functions :

• canbus_send_data CAN Bus send data function.

  err_t canbus_send_data ( canbus_t *ctx, char *tx_data );

• canbus_set_high_speed_mode CAN Bus high speed mode function.

  err_t canbus_set_high_speed_mode ( canbus_t *ctx );

• canbus_set_low_current_standby_mode CAN Bus low current standby mode function.

  err_t canbus_set_low_current_standby_mode ( canbus_t *ctx );

Example Description

This library contains API for CAN Bus click board™. This example transmits/receives and processes data from CAN Bus click. The library initializes and defines the UART bus drivers to transmit or receive data.

The demo application is composed of two sections :

Application Init

Initializes driver, wake-up module, and set high-speed operation mode.

void application_init ( void ) {
    log_cfg_t log_cfg;        /**< Logger config object. */
    canbus_cfg_t canbus_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.

    canbus_cfg_setup( &canbus_cfg );
    CANBUS_MAP_MIKROBUS( canbus_cfg, MIKROBUS_1 );
    err_t init_flag  = canbus_init( &canbus, &canbus_cfg );
    if ( init_flag == UART_ERROR ) {
        log_error( &logger, " Application Init Error. " );
        log_info( &logger, " Please, run program again... " );

        for ( ; ; );
    }

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

    canbus_set_high_speed_mode( &canbus );
    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

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

    #endif

    #ifdef RECIEVER

        canbus_process( );

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

    #endif
}

Additional Function

• canbus_clear_app_buf Function clears memory of app_buf.

  static void canbus_clear_app_buf ( void );

• canbus_process The general process of collecting presponce that a module sends.

  static err_t canbus_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.CanBus

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.