Button BTN-01

1 Introduction

The Matrix-Button is an instant(non self-lock) button. The button's status can be read from pin S in the 3-pin 2.54 mm spacing pin header. If the button is not pressed S will output high otherwise S will output low.

2 Features

• Instant, non self-lock
• Tiny, easy to be used in various situations
• 2.54mm spacing pin

3 How To

• Connect to Tiny4412 SDK (1506)
  

  Connect the module's pin S to GPIO PIN1, pin V to 5V and pin G grounded

Code Sample in C Under Linux

#include <stdio.h>
#include "libfahw.h"
static struct sensor button[] = {
 {
TINY4412_GPIO_PIN1,
IRQ_TYPE_EDGE_FALLING,
}
};
 int main(void)
{
    int i;
    int retSize = -1;
    char value[ARRAY_SIZE(button)];
    int devFD = -1;
    if ((devFD =sensorInit(button, ARRAY_SIZE(button)
)) == -1) {
        printf("Fail to init sensor
");
        return -1;
    }
    printf("Press the button...
");
    if (( retSize = sensorRead(devFD, value, ARRAY_SIZE(button)) ) == -1) {
        printf("Fail to read sensors
");
    }
    if (retSize > 0) {
        i = 0;
        for (i=0; i<retSize; i++) {
            printf("Button[%d]:%d
", i, value[i]);
        }
    }
    sensorDeinit(devFD);
    return 0;
}

Compile and Run

git clone http://github.com/friendlyarm/fa-hardware.gitcd fa-hardware
cd demo
cd matrix-button
make

Copy your compiled bin to your board and you are ready to go.

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