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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
main.cpp
- Committer:
- abuckton
- Date:
- 2011-02-28
- Revision:
- 1:d1837531c318
- Parent:
- 0:2e5b82508aea
File content as of revision 1:d1837531c318:
/* Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au) Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include <mbed.h> #include <string> #include <list> #include <mpr121.h> // 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("."); } }