102 lines
2.7 KiB
C++
102 lines
2.7 KiB
C++
/**
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* @file MPR121.ino
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* @author Lewis He (lewishe@outlook.com)
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* @license MIT
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* @copyright Copyright (c) 2023 Shenzhen Xin Yuan Electronic Technology Co., Ltd
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* @date 2023-06-30
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* @note MPR121 is an external access sensor, not included in T-Display S3
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*/
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#include <Arduino.h>
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#include <Wire.h>
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#include <Adafruit_MPR121.h>
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Adafruit_MPR121 cap1 = Adafruit_MPR121();
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Adafruit_MPR121 cap2 = Adafruit_MPR121();
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void deviceScan(TwoWire *_port, Stream *stream)
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{
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uint8_t err, addr;
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int nDevices = 0;
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for (addr = 1; addr < 127; addr++) {
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_port->beginTransmission(addr);
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err = _port->endTransmission();
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if (err == 0) {
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stream->print("I2C device found at address 0x");
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if (addr < 16)
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stream->print("0");
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stream->print(addr, HEX);
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stream->println(" !");
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nDevices++;
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} else if (err == 4) {
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stream->print("Unknow error at address 0x");
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if (addr < 16)
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stream->print("0");
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stream->println(addr, HEX);
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}
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}
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if (nDevices == 0)
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stream->println("No I2C devices found\n");
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else
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stream->println("Done\n");
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}
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int sda = 18;
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int scl = 17;
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#define PIN_POWER_ON 15
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void setup()
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{
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pinMode(PIN_POWER_ON, OUTPUT);
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digitalWrite(PIN_POWER_ON, HIGH);
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Serial.begin(115200);
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Wire.begin(sda, scl);
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deviceScan(&Wire, &Serial);
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if (!cap1.begin(0x5A)) {
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Serial.println("MPR121 not found, check wiring?");
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while (1);
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}
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Serial.println("MPR121 found!");
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if (!cap2.begin(0x5B)) {
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Serial.println("MPR121 not found, check wiring?");
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while (1);
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}
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Serial.println("MPR121 found!");
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}
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bool getTouch(Adafruit_MPR121 &cap, uint8_t index)
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{
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uint16_t lasttouched[2] = {0};
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uint16_t currtouched[2] = {0};
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// Get the currently touched pads
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currtouched[index] = cap.touched();
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for (uint8_t i = 0; i < 12; i++) {
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// it if *is* touched and *wasnt* touched before, alert!
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if ((currtouched[index] & _BV(i)) && !(lasttouched[index] & _BV(i)) ) {
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Serial.print("Cap"); Serial.print(index); Serial.print(" -> ");
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Serial.print(i); Serial.println(" touched");
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}
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// if it *was* touched and now *isnt*, alert!
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if (!(currtouched[index] & _BV(i)) && (lasttouched[index] & _BV(i)) ) {
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Serial.print("Cap"); Serial.print(index); Serial.print(" -> ");
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Serial.print(i); Serial.println(" released");
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}
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}
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// reset our state
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lasttouched[index] = currtouched[index];
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return true;
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}
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void loop()
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{
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getTouch(cap1, 0);
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getTouch(cap2, 1);
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delay(1);
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}
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