Difference between revisions of "Matrix - Button"
From FriendlyELEC WiKi
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Copy your compiled bin to your board and you are ready to go. | Copy your compiled bin to your board and you are ready to go. | ||
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Revision as of 07:07, 7 August 2015
Contents
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
3.1 Connection
- Connect to Tiny4412 SDK (1506)
- Connect the module's pin S to GPIO PIN1, pin V to 5V and pin G grounded
3.2 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\n"); return -1; } printf("Press the button...\n"); if (( retSize = sensorRead(devFD, value, ARRAY_SIZE(button)) ) == -1) { printf("Fail to read sensors\n"); } if (retSize > 0) { i = 0; for (i=0; i<retSize; i++) { printf("Button[%d]:%d\n", i, value[i]); } } sensorDeinit(devFD); return 0; }
3.3 Compile and Run
git clone http://github.com/friendlyarm/fa-hardware.git cd fa-hardware cd demo cd matrix-button make
Copy your compiled bin to your board and you are ready to go.
