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mikroSDK Library

EXPAND 6

Rating:

5

Author: MIKROE

Last Updated: 2020-09-11

Package Version: 1.0.0.0

mikroSDK Library: 1.0.0.0

Category: Port expander

Downloaded: 3252 times

Not followed.

License: MIT license  

EXPAND 6 Click is a compact add-on board that contains an I2C configurable multi-port I/O expander with independently configurable pins as bi-directional input/outputs or PWM outputs. This board features the CY8C9520A, 20-bit I/O expander with EEPROM, and 4 independently configurable 8-bit PWM outputs from Cypress Semiconductor.

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  • mikroSDK Library 2.0.0.0
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mikroSDK Library Blog

EXPAND 6 Click

EXPAND 6 Click

Native view of the EXPAND 6 Click board.

View full image
EXPAND 6 Click

EXPAND 6 Click

Front and back view of the EXPAND 6 Click board.

View full image

Library Description

The library covers necessary functions that enables the usage of the EXPAND 6 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 expand6_read_pin ( uint16_t pin, uint8_t inv ); - Function is used to read the state of a defined pin.
  • void expand6_write_pin ( uint16_t pin, uint8_t pin_val ); - Function is used to set a single output pin's logic level.
  • void expand6_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 6 click by toggling each of 20 available pins.
void application_task ( )
{
    mikrobus_logWrite( " PORT 0 ", _LOG_LINE );
    for ( pin_num = 0; pin_num < 8; pin_num++ )
    {
        expand6_write_port( EXPAND6_PORT_0, 0xFF );
        expand6_write_pin( pin_num, EXPAND6_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( 500 );
        expand6_write_port( EXPAND6_PORT_0, 0xFF );
    }
    Delay_ms( 1000 );
    mikrobus_logWrite( " PORT 1 ", _LOG_LINE );
    for ( pin_num = 8; pin_num < 16; pin_num++ )
    {
        expand6_write_port( EXPAND6_PORT_1, 0xFF );
        expand6_write_pin( pin_num, EXPAND6_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( 500 );
        expand6_write_port( EXPAND6_PORT_1, 0xFF );
    }
    Delay_ms( 1000 );
    mikrobus_logWrite( " PORT 2 ", _LOG_LINE );
    for ( pin_num = 16; pin_num < 20; pin_num++ )
    {
        expand6_write_port( EXPAND6_PORT_2, 0xFF );
        expand6_write_pin( pin_num, EXPAND6_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( 500 );
        expand6_write_port( EXPAND6_PORT_2, 0xFF );
    }
    mikrobus_logWrite( "-------------------", _LOG_LINE );
    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 clickUSB 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.

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