MPR121_Demo - MPR121 demo code for 12 key Sparkfun touch keypad…

Users » 4180_1 » Code » MPR121_Demo

jim hamblen / Mbed 2 deprecated MPR121_Demo

MPR121 demo code for 12 key Sparkfun touch keypad - sends key number to LEDs. Based on Sparkfun MPR121 code ported to mbed by Anthony Buckton

Dependencies: mbed

main.cpp@0:e09703934ff4, 2011-03-16 (annotated)

Committer:: 4180_1
Date:: Wed Mar 16 01:49:13 2011 +0000
Revision:: 0:e09703934ff4

Who changed what in which revision?

User	Revision	Line number	New contents of line
4180_1	0:e09703934ff4	1	/*
4180_1	0:e09703934ff4	2	Copyright (c) 2011 Anthony Buckton (abuckton [at] blackink [dot} net {dot} au)
4180_1	0:e09703934ff4	3
4180_1	0:e09703934ff4	4	Permission is hereby granted, free of charge, to any person obtaining a copy
4180_1	0:e09703934ff4	5	of this software and associated documentation files (the "Software"), to deal
4180_1	0:e09703934ff4	6	in the Software without restriction, including without limitation the rights
4180_1	0:e09703934ff4	7	to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
4180_1	0:e09703934ff4	8	copies of the Software, and to permit persons to whom the Software is
4180_1	0:e09703934ff4	9	furnished to do so, subject to the following conditions:
4180_1	0:e09703934ff4	10
4180_1	0:e09703934ff4	11	The above copyright notice and this permission notice shall be included in
4180_1	0:e09703934ff4	12	all copies or substantial portions of the Software.
4180_1	0:e09703934ff4	13
4180_1	0:e09703934ff4	14	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
4180_1	0:e09703934ff4	15	IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
4180_1	0:e09703934ff4	16	FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
4180_1	0:e09703934ff4	17	AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
4180_1	0:e09703934ff4	18	LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
4180_1	0:e09703934ff4	19	OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
4180_1	0:e09703934ff4	20	THE SOFTWARE.
4180_1	0:e09703934ff4	21	*/
4180_1	0:e09703934ff4	22
4180_1	0:e09703934ff4	23	#include <mbed.h>
4180_1	0:e09703934ff4	24	#include <string>
4180_1	0:e09703934ff4	25	#include <list>
4180_1	0:e09703934ff4	26
4180_1	0:e09703934ff4	27	#include <mpr121.h>
4180_1	0:e09703934ff4	28
4180_1	0:e09703934ff4	29	DigitalOut led1(LED1);
4180_1	0:e09703934ff4	30	DigitalOut led2(LED2);
4180_1	0:e09703934ff4	31	DigitalOut led3(LED3);
4180_1	0:e09703934ff4	32	DigitalOut led4(LED4);
4180_1	0:e09703934ff4	33
4180_1	0:e09703934ff4	34	// Create the interrupt receiver object on pin 26
4180_1	0:e09703934ff4	35	InterruptIn interrupt(p26);
4180_1	0:e09703934ff4	36
4180_1	0:e09703934ff4	37	// Setup the Serial to the PC for debugging
4180_1	0:e09703934ff4	38	Serial pc(USBTX, USBRX);
4180_1	0:e09703934ff4	39
4180_1	0:e09703934ff4	40	// Setup the i2c bus on pins 28 and 27
4180_1	0:e09703934ff4	41	I2C i2c(p9, p10);
4180_1	0:e09703934ff4	42
4180_1	0:e09703934ff4	43	// Setup the Mpr121:
4180_1	0:e09703934ff4	44	// constructor(i2c object, i2c address of the mpr121)
4180_1	0:e09703934ff4	45	Mpr121 mpr121(&i2c, Mpr121::ADD_VSS);
4180_1	0:e09703934ff4	46
4180_1	0:e09703934ff4	47	void fallInterrupt() {
4180_1	0:e09703934ff4	48	int key_code=0;
4180_1	0:e09703934ff4	49	int i=0;
4180_1	0:e09703934ff4	50	int value=mpr121.read(0x00);
4180_1	0:e09703934ff4	51	value +=mpr121.read(0x01)<<8;
4180_1	0:e09703934ff4	52	// LED demo mod by J. Hamblen
4180_1	0:e09703934ff4	53	//pc.printf("MPR value: %x \r\n", value);
4180_1	0:e09703934ff4	54	i=0;
4180_1	0:e09703934ff4	55	// puts key number out to LEDs for demo
4180_1	0:e09703934ff4	56	for (i=0; i<12; i++) {
4180_1	0:e09703934ff4	57	if (((value>>i)&0x01)==1) key_code=i+1;
4180_1	0:e09703934ff4	58	}
4180_1	0:e09703934ff4	59	led4=key_code & 0x01;
4180_1	0:e09703934ff4	60	led3=(key_code>>1) & 0x01;
4180_1	0:e09703934ff4	61	led2=(key_code>>2) & 0x01;
4180_1	0:e09703934ff4	62	led1=(key_code>>3) & 0x01;
4180_1	0:e09703934ff4	63	}
4180_1	0:e09703934ff4	64	int main() {
4180_1	0:e09703934ff4	65
4180_1	0:e09703934ff4	66	pc.printf("\nHello from the mbed & mpr121\n\r");
4180_1	0:e09703934ff4	67
4180_1	0:e09703934ff4	68	unsigned char dataArray[2];
4180_1	0:e09703934ff4	69	int key;
4180_1	0:e09703934ff4	70	int count = 0;
4180_1	0:e09703934ff4	71
4180_1	0:e09703934ff4	72	pc.printf("Test 1: read a value: \r\n");
4180_1	0:e09703934ff4	73	dataArray[0] = mpr121.read(AFE_CFG);
4180_1	0:e09703934ff4	74	pc.printf("Read value=%x\r\n\n",dataArray[0]);
4180_1	0:e09703934ff4	75
4180_1	0:e09703934ff4	76	pc.printf("Test 2: read a value: \r\n");
4180_1	0:e09703934ff4	77	dataArray[0] = mpr121.read(0x5d);
4180_1	0:e09703934ff4	78	pc.printf("Read value=%x\r\n\n",dataArray[0]);
4180_1	0:e09703934ff4	79
4180_1	0:e09703934ff4	80	pc.printf("Test 3: write & read a value: \r\n");
4180_1	0:e09703934ff4	81	mpr121.read(ELE0_T);
4180_1	0:e09703934ff4	82	mpr121.write(ELE0_T,0x22);
4180_1	0:e09703934ff4	83	dataArray[0] = mpr121.read(ELE0_T);
4180_1	0:e09703934ff4	84	pc.printf("Read value=%x\r\n\n",dataArray[0]);
4180_1	0:e09703934ff4	85
4180_1	0:e09703934ff4	86	pc.printf("Test 4: Write many values: \r\n");
4180_1	0:e09703934ff4	87	unsigned char data[] = {0x1,0x3,0x5,0x9,0x15,0x25,0x41};
4180_1	0:e09703934ff4	88	mpr121.writeMany(0x42,data,7);
4180_1	0:e09703934ff4	89
4180_1	0:e09703934ff4	90	// Now read them back ..
4180_1	0:e09703934ff4	91	key = 0x42;
4180_1	0:e09703934ff4	92	count = 0;
4180_1	0:e09703934ff4	93	while (count < 7) {
4180_1	0:e09703934ff4	94	char result = mpr121.read(key);
4180_1	0:e09703934ff4	95	key++;
4180_1	0:e09703934ff4	96	count++;
4180_1	0:e09703934ff4	97	pc.printf("Read value: '%x'=%x\n\r",key,result);
4180_1	0:e09703934ff4	98	}
4180_1	0:e09703934ff4	99
4180_1	0:e09703934ff4	100	pc.printf("Test 5: Read Electrodes:\r\n");
4180_1	0:e09703934ff4	101	key = ELE0_T;
4180_1	0:e09703934ff4	102	count = 0;
4180_1	0:e09703934ff4	103	while (count < 24) {
4180_1	0:e09703934ff4	104	char result = mpr121.read(key);
4180_1	0:e09703934ff4	105	pc.printf("Read key:%x value:%x\n\r",key,result);
4180_1	0:e09703934ff4	106	key++;
4180_1	0:e09703934ff4	107	count++;
4180_1	0:e09703934ff4	108	}
4180_1	0:e09703934ff4	109	pc.printf("--------- \r\n\n");
4180_1	0:e09703934ff4	110
4180_1	0:e09703934ff4	111	// mpr121.setProximityMode(true);
4180_1	0:e09703934ff4	112
4180_1	0:e09703934ff4	113	pc.printf("ELE_CFG=%x", mpr121.read(ELE_CFG));
4180_1	0:e09703934ff4	114
4180_1	0:e09703934ff4	115	interrupt.fall(&fallInterrupt);
4180_1	0:e09703934ff4	116	interrupt.mode(PullUp);
4180_1	0:e09703934ff4	117
4180_1	0:e09703934ff4	118	while (1) {
4180_1	0:e09703934ff4	119	wait(5);
4180_1	0:e09703934ff4	120	pc.printf(".");
4180_1	0:e09703934ff4	121	}
4180_1	0:e09703934ff4	122	}
4180_1	0:e09703934ff4	123
4180_1	0:e09703934ff4	124
4180_1	0:e09703934ff4	125

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Type:	Program
Mbed OS support:	Mbed 2 deprecated
Created:	16 Mar 2011
Imports:	2062
Forks:	13
Commits:	1
Dependents:	0
Dependencies:	1
Followers:	4

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Sparkfun Touch Keypad

main.cpp@0:e09703934ff4, 2011-03-16 (annotated)

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