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CAN Bus Click

CAN Bus Click demo application is developed using the NECTO Studio, ensuring compatibility with mikroSDK's open-source libraries and tools. Designed for plug-and-play implementation and testing, the demo is fully compatible with all development, starter, and mikromedia boards featuring a mikroBUS™ socket.

Click Library

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

Software Support

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.

Example Libraries

  • MikroSDK.Board
  • MikroSDK.Log
  • Click.CanBus

Example Key Functions

  • canbus_cfg_setup Config Object Initialization function.
void canbus_cfg_setup ( canbus_cfg_t *cfg );
  • canbus_init Initialization function.
err_t canbus_init ( canbus_t *ctx, canbus_cfg_t *cfg );
  • canbus_default_cfg Click Default Configuration function.
void canbus_default_cfg ( canbus_t *ctx );
  • 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 );

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 );

Application Output

This Click board can be interfaced and monitored in two ways:

  • Application Output - Use the "Application Output" window in Debug mode for real-time data monitoring. Set it up properly by following this tutorial.
  • UART Terminal - Monitor data via the UART Terminal using a USB to UART converter. For detailed instructions, check out this tutorial.

Additional Notes and Information

The complete application code and a ready-to-use project are available through the NECTO Studio Package Manager for direct installation in the NECTO Studio. The application code can also be found on the MIKROE GitHub account.