hima bindu pallanti
/
mbed_key
4*4 keypad interfacing with arm lpc1768 for entering 0-9 digits.
main.cpp
- Committer:
- himabindupallanti
- Date:
- 2015-10-10
- Revision:
- 0:5e96fed89c06
File content as of revision 0:5e96fed89c06:
#include "mbed.h" #include "Keypad.h" Serial PC(USBTX, USBRX); // Define your own keypad values char Keytable[] = { '1', '2', '3', // r0 '4', '5', '6', // r1 '7', '8', '9', '0' // r2 // c0 c1 c2 }; int32_t Index = -1; int State; uint32_t cbAfterInput(uint32_t index) { Index = index; return 0; } int main() { PC.printf("I am Demo Keypad\r\n"); // r0 r1 r2 r3 c0 c1 c2 c3 Keypad keypad(p21, p22, p23, p24, p25, p26, p27, p28); keypad.attach(&cbAfterInput); keypad.start(); // energize the columns c0-c3 of the keypad while (1) { __wfi(); if (Index > -1) { PC.printf("Interrupted"); PC.printf("Index:%d => Key:%c\r\n", Index, Keytable[Index]); Index = -1; } } }