Capacitive Touch Sensing with Nano Every

Projects General Guidance
1

I noticed that the regular capacitive touch library didn't work with my Nano Every. After looking through the datasheets I found that it's because the register addresses for the PORT control registers have different offsets from the 328p.

Here is my new code for the CapacitiveSensor.h file. CAUTION it breaks the library for any microcontroller that's not the Nano Every.

/*
  CapacitiveSense.h v.04 - Capacitive Sensing Library for 'duino / Wiring
  https://github.com/PaulStoffregen/CapacitiveSensor
  http://www.pjrc.com/teensy/td_libs_CapacitiveSensor.html
  http://playground.arduino.cc/Main/CapacitiveSensor
  Copyright (c) 2008 Paul Bagder  All rights reserved.
  Version 05 by Paul Stoffregen - Support non-AVR board: Teensy 3.x, Arduino Due
  Version 04 by Paul Stoffregen - Arduino 1.0 compatibility, issue 146 fix
  vim: set ts=4:
*/

// ensure this library description is only included once
#ifndef CapacitiveSensor_h
#define CapacitiveSensor_h

#if ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif

// Direct I/O through registers and bitmask (from OneWire library)
// Initial Settings
/*
#define PIN_TO_BASEREG(pin)             (portInputRegister(digitalPinToPort(pin)))
#define PIN_TO_BITMASK(pin)             (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint8_t
#define DIRECT_READ(base, mask)         (((*(base)) & (mask)) ? 1 : 0)
#define DIRECT_MODE_INPUT(base, mask)   ((*((base)+1)) &= ~(mask), (*((base)+2)) &= ~(mask))
#define DIRECT_MODE_OUTPUT(base, mask)  ((*((base)+1)) |= (mask))
#define DIRECT_WRITE_LOW(base, mask)    ((*((base)+2)) &= ~(mask))
#define DIRECT_WRITE_HIGH(base, mask)   ((*((base)+2)) |= (mask))
*/

// Nano Every Settings
#define PIN_TO_BASEREG(pin)             (portInputRegister(digitalPinToPort(pin)))
#define PIN_TO_BITMASK(pin)             (digitalPinToBitMask(pin))
#define IO_REG_TYPE uint8_t
#define DIRECT_READ(base, mask)         (((*(base)) & (mask)) ? 1 : 0)
#define DIRECT_MODE_INPUT(base, mask)   ((*((base)-8)) &= ~(mask), (*((base)-4)) &= ~(mask))
#define DIRECT_MODE_OUTPUT(base, mask)  ((*((base)-8)) |= (mask))
#define DIRECT_WRITE_LOW(base, mask)    ((*((base)-4)) &= ~(mask))
#define DIRECT_WRITE_HIGH(base, mask)   ((*((base)-4)) |= (mask))

// library interface description
class CapacitiveSensor
{
  // user-accessible "public" interface
  public:
  // methods
	CapacitiveSensor(uint8_t sendPin, uint8_t receivePin);
	long capacitiveSensorRaw(uint8_t samples);
	long capacitiveSensor(uint8_t samples);
	void set_CS_Timeout_Millis(unsigned long timeout_millis);
	void reset_CS_AutoCal();
	void set_CS_AutocaL_Millis(unsigned long autoCal_millis);
    int baseValue(uint8_t sendPin);
    int maskValue(uint8_t sendPin);
  // library-accessible "private" interface
  private:
  // variables
	int error;
	unsigned long  leastTotal;
	unsigned int   loopTimingFactor;
	unsigned long  CS_Timeout_Millis;
	unsigned long  CS_AutocaL_Millis;
	unsigned long  lastCal;
	unsigned long  total;
	IO_REG_TYPE sBit;   // send pin's ports and bitmask
	volatile IO_REG_TYPE *sReg;
	IO_REG_TYPE rBit;    // receive pin's ports and bitmask
	volatile IO_REG_TYPE *rReg;
  // methods
	int SenseOneCycle(void);
};

#endif
2

This new code works wonderfully on my Nano Every.
Would be nice if this new library could be made public globally for future enginerds.
Either way thanks to all of you

3

Hello, I'm new to Arduino and have tried cutting and pasting the code into the beginning of my sketch but Capacitive Touch still does not work. what am I meant to do with the code??

4

Ok. I found where Arduino keeps its header files and replaced the contents of CapacitiveSensor.h ( after backing up the original) with your code and it's working great. Thank you

5

I have found that once I use pinMode in setup() the CapacitiveSense returns -2. is there a solution to this problem as I want to use the pins to drive LEDs