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/**************************************************************************/
/*!
@file SwRotaryEncoder.cpp
@author hathach (tinyusb.org)
@section LICENSE
Software License Agreement (BSD License)
Copyright (c) 2018, Adafruit Industries (adafruit.com)
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holders nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**************************************************************************/
#include "SwRotaryEncoder.h"
void _pina_irq(uint8_t id);
#define _pina_irqn(n) \
void _pina_irqn##_##n(void) { \
_pina_irq(n);\
}
extern "C"
{
_pina_irqn(0)
_pina_irqn(1)
_pina_irqn(2)
_pina_irqn(3)
// _pina_irqn(4)
// _pina_irqn(5)
// _pina_irqn(6)
// _pina_irqn(7)
// add more to match SW_ROTARY_ENCODER_MAX_INSTANCE
}
static uint8_t _encoder_count = 0;
static SwRotaryEncoder* _encoder_ptr[SW_ROTARY_ENCODER_MAX_INSTANCE] = { NULL };
static voidFuncPtr _pina_irq_ptr[SW_ROTARY_ENCODER_MAX_INSTANCE] =
{
_pina_irqn_0, _pina_irqn_1, _pina_irqn_2, _pina_irqn_3,
// _pina_irqn_4, _pina_irqn_5, _pina_irqn_6, _pina_irqn_7
};
bool SwRotaryEncoder::begin(uint8_t pina, uint8_t pinb)
{
// Add to pointer array
VERIFY ( _encoder_count < SW_ROTARY_ENCODER_MAX_INSTANCE);
_encoder_ptr[_encoder_count] = this;
_pina = pina;
_pinb = pinb;
pinMode(_pina, INPUT_PULLUP);
pinMode(_pinb, INPUT_PULLUP);
_a_last = digitalRead(_pina);
attachInterrupt(_pina, _pina_irq_ptr[_encoder_count], CHANGE);
_encoder_count++;
return true;
}
void SwRotaryEncoder::setCallback(callback_t fp)
{
_cb = fp;
}
void SwRotaryEncoder::stop(void)
{
detachInterrupt(_pina);
}
int32_t SwRotaryEncoder::read(void)
{
int32_t ret = _abs - _last_read;
_last_read = _abs;
return ret;
}
int32_t SwRotaryEncoder::readAbs(void)
{
return _abs;
}
void SwRotaryEncoder::writeAbs(int32_t value)
{
_abs = value;
}
void SwRotaryEncoder::clearAbs(void)
{
_abs = 0;
}
void SwRotaryEncoder::_irq_handler(void)
{
uint32_t val = NRF_GPIO->IN;
uint8_t bita = bitRead(val, _pina);
if ( bita != _a_last)
{
int32_t step;
if ( bita != bitRead(val, _pinb) )
{
step = 1;
}else
{
step = -1;
}
_abs += step;
_a_last = bita;
if (_cb) ada_callback_fromISR(NULL, _cb, step);
}
}
void _pina_irq(uint8_t id)
{
_encoder_ptr[id]->_irq_handler();
}
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