Library Description

The library covers all the necessary functions to control Buck Click board. Buck click communicates with the target microcontroller over the following pins on the mikroBUS™ line: PWM, INT, RS, CS. This library contains drivers for soft reset, for enabling and disabling, for checking state of internal comparator, for setting A1 and A2 multiplexer and for setting the switching frequency function of LT3976 chip on Buck Click.

Key functions:

• void buck_softReset() -Soft reset chip function.

• void buck_enable() - Enable switch channel function.

• void buck_switchFreq( uint8_t frequency ) - Switch the frequency function.

Examples description

The application is composed of the three sections :

• System Initialization - Initializes GPIO and INT pin as input and CS, RST and PWM pins as output.
• Application Initialization - Initialization driver enable's - GPIO, soft reset Buck click and start write log.
• Application Task - (code snippet) This is a example which demonstrates the use of Buck Click board. Checks if it has reached the set output voltage and sets a different frequency to the LT3976 chip every 5 sec.

void applicationTask()
{   
    if ( buck_getPowerGood() ) 
    {
        mikrobus_logWrite( " Power good output voltage! ", _LOG_LINE );
    }
    
    Delay_ms( 1000 );
    mikrobus_logWrite( "----------------------------", _LOG_LINE ); 
    mikrobus_logWrite( " Switching frequency 400kHz ", _LOG_LINE );
    mikrobus_logWrite( "----------------------------", _LOG_LINE );
    buck_switchFreq( _BUCK_FREQ_400KHz );
    
    Delay_ms( 5000 );
    mikrobus_logWrite( " Switching frequency 800kHz ", _LOG_LINE );
    mikrobus_logWrite( "----------------------------", _LOG_LINE );
    buck_switchFreq( _BUCK_FREQ_800KHz );
    Delay_ms( 5000 );
}

Other mikroE Libraries used in the example:

• GPIO
• UART

Additional notes and information

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.