Library Description

The library covers all the necessary functions to control SPI Extend click board. Library performs a standard SPI interface communication.

Key functions:

• void spiextend_generic_write ( uint8_t reg, uint8_t tx_data ) - Generic write data function.
• void spiextend_get_config ( spiextend_config_data_t *config_data ) - Get the configuration function.
• uint8_t spiextend_rmt_read ( uint8_t reg, uint8_t sel_slave ) - Generic read data in Remote Mode function.

Examples description

The application is composed of three sections :

• System Initialization - Initializes SPI, sets INT pin as input and AN, RST, CS nad PWM pins as outputs and begins to write log.
• Application Initialization - Initialization driver enables - SPI, set default configuration of the Accel 14 Click connected to the SPI Extend Click ( Remote Mode ).
• Application Task - (code snippet) This is an example which demonstrates the use of SPI Extend Click board. In this example, if the connection is established, we read Accel axis of the connected Accel 14 Click boards to the SPI Extend Click ( Remote Mode ) which is connected by a LAN cable to SPI Extend Click ( Local Mode ) placed in the mikroBUS 1. Results are being sent to the Usart Terminal where you can track their changes. All data logs write on USB uart changes for every 1 sec.

void application_task ( )
{
    spiextend_get_status( &spiextend_status );
    
    if ( spiextend_status.nlink == SPIEXTEND_STATUS_ACTIVE )
    {
        spiextend_accel14_get_axis( SPIEXTEND_ACCEL14_REG_OUTX_L_A );
        mikrobus_logWrite( "  Accel X : ", _LOG_TEXT );
        IntToStr( axis, log_text );
        mikrobus_logWrite( log_text, _LOG_LINE );

        spiextend_accel14_get_axis( SPIEXTEND_ACCEL14_REG_OUTY_L_A );
        mikrobus_logWrite( "  Accel Y : ", _LOG_TEXT );
        IntToStr( axis, log_text );
        mikrobus_logWrite( log_text, _LOG_LINE );

        spiextend_accel14_get_axis( SPIEXTEND_ACCEL14_REG_OUTZ_L_A );
        mikrobus_logWrite( "  Accel Z : ", _LOG_TEXT );
        IntToStr( axis, log_text );
        mikrobus_logWrite( log_text, _LOG_LINE );

        mikrobus_logWrite( "---------------------", _LOG_LINE );
        Delay_ms( 1000 );
    }
    else
    {
        mikrobus_logWrite( " LINK not established", _LOG_LINE );
        mikrobus_logWrite( "---------------------", _LOG_LINE );
        Delay_ms( 1000 );
    }
}

Additional Functions :

• void spiextend_accel14_get_axis ( uint8_t axis_out_reg )  - Read axis.
• void spiextend_display_status ( uint8_t check_status )  - Display status.

Other mikroE Libraries used in the example:

• SPI
• UART
• Conversions

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. The terminal available in all MikroElektronika compilers, or any other terminal application of your choice, can be used to read the message.