ECE 4180 Labs / Mbed 2 deprecated 4180_Lab1_TouchKeyPad

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Dependencies:   mbed

main.cpp@0:42cceb842d76, 2016-09-25 (annotated)

Committer:
jeremycai3721
Date:
Sun Sep 25 20:20:04 2016 +0000
Revision:
0:42cceb842d76
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jeremycai3721 0:42cceb842d76 1 #include <mbed.h>
jeremycai3721 0:42cceb842d76 2 #include <mpr121.h>
jeremycai3721 0:42cceb842d76 3 DigitalOut led1(LED1);
jeremycai3721 0:42cceb842d76 4 DigitalOut led2(LED2);
jeremycai3721 0:42cceb842d76 5 DigitalOut led3(LED3);
jeremycai3721 0:42cceb842d76 6 DigitalOut led4(LED4);
jeremycai3721 0:42cceb842d76 7 // Create the interrupt receiver object on pin 26
jeremycai3721 0:42cceb842d76 8 InterruptIn interrupt(p26);
jeremycai3721 0:42cceb842d76 9 // Setup the i2c bus on pins 28 and 27
jeremycai3721 0:42cceb842d76 10 I2C i2c(p28, p27);
jeremycai3721 0:42cceb842d76 11 // Setup the Mpr121:
jeremycai3721 0:42cceb842d76 12 // constructor(i2c object, i2c address of the mpr121)
jeremycai3721 0:42cceb842d76 13 Mpr121 mpr121(&i2c, Mpr121::ADD_VSS);
jeremycai3721 0:42cceb842d76 14
jeremycai3721 0:42cceb842d76 15 // Key hit/release interrupt routine
jeremycai3721 0:42cceb842d76 16 void fallInterrupt() {
jeremycai3721 0:42cceb842d76 17 int key_code=0;
jeremycai3721 0:42cceb842d76 18 int i=0;
jeremycai3721 0:42cceb842d76 19 int value=mpr121.read(0x00);
jeremycai3721 0:42cceb842d76 20 value +=mpr121.read(0x01)<<8;
jeremycai3721 0:42cceb842d76 21 // LED demo mod
jeremycai3721 0:42cceb842d76 22 i=0;
jeremycai3721 0:42cceb842d76 23 // puts key number out to LEDs for demo
jeremycai3721 0:42cceb842d76 24 for (i=0; i<12; i++) {
jeremycai3721 0:42cceb842d76 25 if (((value>>i)&0x01)==1) key_code=i+1;
jeremycai3721 0:42cceb842d76 26 }
jeremycai3721 0:42cceb842d76 27 led4=key_code & 0x01;
jeremycai3721 0:42cceb842d76 28 led3=(key_code>>1) & 0x01;
jeremycai3721 0:42cceb842d76 29 led2=(key_code>>2) & 0x01;
jeremycai3721 0:42cceb842d76 30 led1=(key_code>>3) & 0x01;
jeremycai3721 0:42cceb842d76 31 }
jeremycai3721 0:42cceb842d76 32
jeremycai3721 0:42cceb842d76 33 int main() {
jeremycai3721 0:42cceb842d76 34 interrupt.fall(&fallInterrupt);
jeremycai3721 0:42cceb842d76 35 interrupt.mode(PullUp);
jeremycai3721 0:42cceb842d76 36 while (1) {}
jeremycai3721 0:42cceb842d76 37 }