Library Description

The library covers necessary functions that enables the usage of the EXPAND 7 click board. User can check or set the state of every pin, set PWM output or use on board user available EEPROM.

Key functions:

• uint8_t expand7_read_pin ( uint16_t pin, uint8_t inv ); - Function is used to read the state of a defined pin.
• void expand7_write_pin ( uint16_t pin, uint8_t pin_val ); - Function is used to set a single output pin's logic level.
• void expand7_sel_pwm_pin ( uint16_t pin, uint8_t pwm_en ); - Function is used to enable or disable PWM output on a specific pin.

Examples description

The application is composed of three sections :

• System Initialization - Initializes I2C module, LOG structure and sets RST pin as output and INT pin as input.
• Application Initialization - Initalizes I2C driver and makes an initial log.
• Application Task - (code snippet) This example shows the capabilities of the EXPAND 7 click by toggling each of 40 available pins.

void application_task ( )
{

    for ( pin_num = 0; pin_num < 40; pin_num++ )
    {
        expand7_write_all ( 0xFF );
        
        expand7_write_pin( pin_num, EXPAND7_LOW );
        mikrobus_logWrite( "Pin ", _LOG_TEXT );
        ByteToStr( pin_num, log_txt );
        Ltrim( log_txt );
        mikrobus_logWrite( log_txt, _LOG_TEXT );
        mikrobus_logWrite( " is low!", _LOG_LINE );

        Delay_ms( 200 );
        expand7_write_all ( 0xFF );
    }
    Delay_ms( 1000 );
}

Other mikroE Libraries used in the example:

• I2C
• 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.