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

Committer:
abuckton
Date:
2011-02-28
Revision:
0:2e5b82508aea
Child:
1:d1837531c318

File content as of revision 0:2e5b82508aea:

#include <mbed.h>
#include <string>
#include <list>

#include <mpr121.h>

DigitalOut led1(LED1);
DigitalOut led2(LED2);
DigitalOut led3(LED3);
DigitalOut led4(LED4);


// Create the interrupt receiver object on pin 26
InterruptIn interrupt(p26);

// Setup the Serial to the PC for debugging
Serial pc(USBTX, USBRX);

// Setup the i2c bus on pins 28 and 27
I2C i2c(p28, p27);

// Setup the Mpr121:
// constructor(i2c object, i2c address of the mpr121)
Mpr121 mpr121(&i2c, Mpr121::ADD_VSS);
    
void fallInterrupt(){
    int value=mpr121.read(0x00);
    value +=mpr121.read(0x01)<<8;
    pc.printf("MPR value: %x \r\n", value);
}
    
int main() {

    pc.printf("\nHello from the mbed & mpr121\n\r");
    
    unsigned char dataArray[2];
    int key;
    int count = 0;

    pc.printf("Test 1: read a value: \r\n");
    dataArray[0] = mpr121.read(AFE_CFG);
    pc.printf("Read value=%x\r\n\n",dataArray[0]);
    
    pc.printf("Test 2: read a value: \r\n");
    dataArray[0] = mpr121.read(0x5d);
    pc.printf("Read value=%x\r\n\n",dataArray[0]);

    pc.printf("Test 3: write & read a value: \r\n");
    mpr121.read(ELE0_T);
    mpr121.write(ELE0_T,0x22);
    dataArray[0] = mpr121.read(ELE0_T);
    pc.printf("Read value=%x\r\n\n",dataArray[0]);
    
    pc.printf("Test 4: Write many values: \r\n");
    unsigned char data[] = {0x1,0x3,0x5,0x9,0x15,0x25,0x41};
    mpr121.writeMany(0x42,data,7);
    
    // Now read them back ..
    key = 0x42;
    count = 0;
    while(count < 7){
        char result = mpr121.read(key);
        key++;
        count++;
        pc.printf("Read value: '%x'=%x\n\r",key,result);
    }
    
    pc.printf("Test 5: Read Electrodes:\r\n");
    key = ELE0_T;
    count = 0;
    while(count < 24){
        char result = mpr121.read(key);
        pc.printf("Read key:%x value:%x\n\r",key,result);
        key++;
        count++;    }
    pc.printf("--------- \r\n\n");
    
    mpr121.setProximityMode(true);
    
    pc.printf("ELE_CFG=%x", mpr121.read(ELE_CFG));
    
    interrupt.fall(&fallInterrupt);
    interrupt.mode(PullUp);
    
    while(1){
        wait(5);
        pc.printf(".");
    }

}