Anthony Buckton / Mbed 2 deprecated MPR121

A sample library to get the MPR121-based touch board from SparkFun up and running. This code is based on the sample Arduino code from SparkFun but is ported to C++ for mbed. The Mbed will require 4.7K pull-up resistors on the i2c SCL and SDA lines to communicate with the board. The IRQ line does not. The example code has the SDA on P28, SCL on P27 and IRQ on P26

Dependencies:   mbed

main.cpp@0:2e5b82508aea, 2011-02-28 (annotated)

Committer:
abuckton
Date:
Mon Feb 28 12:07:17 2011 +0000
Revision:
0:2e5b82508aea
Child:
1:d1837531c318
First cut to get things moving

Who changed what in which revision?

UserRevisionLine numberNew contents of line
abuckton 0:2e5b82508aea 1 #include <mbed.h>
abuckton 0:2e5b82508aea 2 #include <string>
abuckton 0:2e5b82508aea 3 #include <list>
abuckton 0:2e5b82508aea 4
abuckton 0:2e5b82508aea 5 #include <mpr121.h>
abuckton 0:2e5b82508aea 6
abuckton 0:2e5b82508aea 7 DigitalOut led1(LED1);
abuckton 0:2e5b82508aea 8 DigitalOut led2(LED2);
abuckton 0:2e5b82508aea 9 DigitalOut led3(LED3);
abuckton 0:2e5b82508aea 10 DigitalOut led4(LED4);
abuckton 0:2e5b82508aea 11
abuckton 0:2e5b82508aea 12
abuckton 0:2e5b82508aea 13 // Create the interrupt receiver object on pin 26
abuckton 0:2e5b82508aea 14 InterruptIn interrupt(p26);
abuckton 0:2e5b82508aea 15
abuckton 0:2e5b82508aea 16 // Setup the Serial to the PC for debugging
abuckton 0:2e5b82508aea 17 Serial pc(USBTX, USBRX);
abuckton 0:2e5b82508aea 18
abuckton 0:2e5b82508aea 19 // Setup the i2c bus on pins 28 and 27
abuckton 0:2e5b82508aea 20 I2C i2c(p28, p27);
abuckton 0:2e5b82508aea 21
abuckton 0:2e5b82508aea 22 // Setup the Mpr121:
abuckton 0:2e5b82508aea 23 // constructor(i2c object, i2c address of the mpr121)
abuckton 0:2e5b82508aea 24 Mpr121 mpr121(&i2c, Mpr121::ADD_VSS);
abuckton 0:2e5b82508aea 25
abuckton 0:2e5b82508aea 26 void fallInterrupt(){
abuckton 0:2e5b82508aea 27 int value=mpr121.read(0x00);
abuckton 0:2e5b82508aea 28 value +=mpr121.read(0x01)<<8;
abuckton 0:2e5b82508aea 29 pc.printf("MPR value: %x \r\n", value);
abuckton 0:2e5b82508aea 30 }
abuckton 0:2e5b82508aea 31
abuckton 0:2e5b82508aea 32 int main() {
abuckton 0:2e5b82508aea 33
abuckton 0:2e5b82508aea 34 pc.printf("\nHello from the mbed & mpr121\n\r");
abuckton 0:2e5b82508aea 35
abuckton 0:2e5b82508aea 36 unsigned char dataArray[2];
abuckton 0:2e5b82508aea 37 int key;
abuckton 0:2e5b82508aea 38 int count = 0;
abuckton 0:2e5b82508aea 39
abuckton 0:2e5b82508aea 40 pc.printf("Test 1: read a value: \r\n");
abuckton 0:2e5b82508aea 41 dataArray[0] = mpr121.read(AFE_CFG);
abuckton 0:2e5b82508aea 42 pc.printf("Read value=%x\r\n\n",dataArray[0]);
abuckton 0:2e5b82508aea 43
abuckton 0:2e5b82508aea 44 pc.printf("Test 2: read a value: \r\n");
abuckton 0:2e5b82508aea 45 dataArray[0] = mpr121.read(0x5d);
abuckton 0:2e5b82508aea 46 pc.printf("Read value=%x\r\n\n",dataArray[0]);
abuckton 0:2e5b82508aea 47
abuckton 0:2e5b82508aea 48 pc.printf("Test 3: write & read a value: \r\n");
abuckton 0:2e5b82508aea 49 mpr121.read(ELE0_T);
abuckton 0:2e5b82508aea 50 mpr121.write(ELE0_T,0x22);
abuckton 0:2e5b82508aea 51 dataArray[0] = mpr121.read(ELE0_T);
abuckton 0:2e5b82508aea 52 pc.printf("Read value=%x\r\n\n",dataArray[0]);
abuckton 0:2e5b82508aea 53
abuckton 0:2e5b82508aea 54 pc.printf("Test 4: Write many values: \r\n");
abuckton 0:2e5b82508aea 55 unsigned char data[] = {0x1,0x3,0x5,0x9,0x15,0x25,0x41};
abuckton 0:2e5b82508aea 56 mpr121.writeMany(0x42,data,7);
abuckton 0:2e5b82508aea 57
abuckton 0:2e5b82508aea 58 // Now read them back ..
abuckton 0:2e5b82508aea 59 key = 0x42;
abuckton 0:2e5b82508aea 60 count = 0;
abuckton 0:2e5b82508aea 61 while(count < 7){
abuckton 0:2e5b82508aea 62 char result = mpr121.read(key);
abuckton 0:2e5b82508aea 63 key++;
abuckton 0:2e5b82508aea 64 count++;
abuckton 0:2e5b82508aea 65 pc.printf("Read value: '%x'=%x\n\r",key,result);
abuckton 0:2e5b82508aea 66 }
abuckton 0:2e5b82508aea 67
abuckton 0:2e5b82508aea 68 pc.printf("Test 5: Read Electrodes:\r\n");
abuckton 0:2e5b82508aea 69 key = ELE0_T;
abuckton 0:2e5b82508aea 70 count = 0;
abuckton 0:2e5b82508aea 71 while(count < 24){
abuckton 0:2e5b82508aea 72 char result = mpr121.read(key);
abuckton 0:2e5b82508aea 73 pc.printf("Read key:%x value:%x\n\r",key,result);
abuckton 0:2e5b82508aea 74 key++;
abuckton 0:2e5b82508aea 75 count++; }
abuckton 0:2e5b82508aea 76 pc.printf("--------- \r\n\n");
abuckton 0:2e5b82508aea 77
abuckton 0:2e5b82508aea 78 mpr121.setProximityMode(true);
abuckton 0:2e5b82508aea 79
abuckton 0:2e5b82508aea 80 pc.printf("ELE_CFG=%x", mpr121.read(ELE_CFG));
abuckton 0:2e5b82508aea 81
abuckton 0:2e5b82508aea 82 interrupt.fall(&fallInterrupt);
abuckton 0:2e5b82508aea 83 interrupt.mode(PullUp);
abuckton 0:2e5b82508aea 84
abuckton 0:2e5b82508aea 85 while(1){
abuckton 0:2e5b82508aea 86 wait(5);
abuckton 0:2e5b82508aea 87 pc.printf(".");
abuckton 0:2e5b82508aea 88 }
abuckton 0:2e5b82508aea 89
abuckton 0:2e5b82508aea 90 }
abuckton 0:2e5b82508aea 91
abuckton 0:2e5b82508aea 92
abuckton 0:2e5b82508aea 93