Features

• 1. Plug and play, easy to use. Compatible with the mainstream 2.54 interfaces and 4-Pin Grove interfaces in the market.
• 2. With use of M4 standard fixed holes, compatible with M4-standard kits such as Lego and Makeblock.
• 3. Hardware with debouncing function for more stable output

Specifications

Note 1: S for digital output port, V and G for voltage at the common collector and ground respectively. Generally speaking, digital output is VCC; when the button is pressed down, the digital output is 0V.

Demo for CoX Library

#include "CooperKit_Button.h"
#include "CooperKit_RGBLed.h"

/*
 * Connect the S port of CooperKit button switch to D0 Pin of Connect shield,
 * and we will use the following program to read the digital value. When the
 * digital value is high level, RGBLED R lamp(whicn is connected to sD1) will
 * be ON; when pressed down the digital value is low level, LED lamp will be
 * OFF.
 */
void Button_Led_Init(void);

void Button_Led(void)
{

        unsignedchar ucButtonRead;
        Button_Led_Init();

        while(1)
        {
                ucButtonRead = CooperKit_Button_Read();

                if(1== ucButtonRead )
                {
                        CooperKit_RedLed_On();
                        //Delay(10);
                }
                else
                {
                        CooperKit_RedLed_Off();
                        //Delay(10);
                }

        }

}

void Button_Led_Init(void)
{
        //
        // Before call this funciton, Configure the pin as PA1 (D0) which connect to CooperKit Button
        // signal first.
        //
        CooperKit_Button_Init();

        //
        // Before call this funciton, Configure the pin as PA0 (D1) which connect to CooperKit RGBLed
        // R signal first.
        //
        CooperKit_RGBLed_Init();
}

How to Port

This demo is based on CoX M051 library, if you want to port to other CoX library, Just do the simple step below.
The Button driver is commucate with GPIO pin, so in the CooperKit_Button.h file, the port configuration group provides the gpio pin connection Macro to user for port.  For example your Button signal pin is connect to GPIOA PIN1, you should modify the Macro as: 

//*****************************************************************************
//
//! \addtogroup CooperKit_Button_Config
//! CooperKit Button configurator
//! @{
//
//*****************************************************************************
//
//! Configure the pin connection of CooperKit Button
//
#define CooperKit_Button_PIN  PA1
//
//! Set the effective output level of CooperKit Button when key is pressed down
//
#define CooperKit_Button_EFFECTIVE_LEVEL                   \
               0
//*****************************************************************************
//
//! @}
//
//*****************************************************************************