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BNOU8 HAL driver

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Asbelos 2022-12-18 12:28:13 +00:00
parent 1d61a8f3f9
commit ac8d453d2c
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IO_DNOU8.h Normal file
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/*
* © 2022, Chris Harlow. All rights reserved.
*
* This file is part of DCC++EX API
*
* This is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* It is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with CommandStation. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef IO_DNOU8_h
#define IO_DNOU8_h
#include <Arduino.h>
#include "IODevice.h"
#define GET_BIT(bit) ((_pinValues[bit/8] >>(bit%8) == 1))
#define SET_BIT(bit) _pinValues[bit/8] |= 1<<(bit%8)
#define CLR_BIT(bit) _pinValues[bit/8] &= ~(1<<(bit%8))
class IO_DNOU8 : public IODevice {
public:
static void create(VPIN firstVpin, int nPins, byte latchPin, byte clockPin, byte dataPin )
{
new IO_DNOU8( firstVpin, nPins, latchPin, clockPin, dataPin);
}
protected:
IO_DNOU8(VPIN firstVpin, int nPins, byte latchPin, byte clockPin, byte dataPin) :
IODevice(firstVpin, nPins) {
_latchPin=latchPin;
_clockPin=clockPin;
_dataPin=dataPin;
_nShiftBytes=(nPins+7)/8; // rounded up to multiples of 8 bits
_pinValues=(byte*) calloc(_nShiftBytes,1);
// Connect to HAL so my _write, _read and _loop will be called as required.
IODevice::addDevice(this);
}
// Called by HAL to start handling this device
void _begin() override {
_xmitPending=true; // will cause transmission of all zeros first time out
_deviceState = DEVSTATE_NORMAL;
pinMode(_latchPin,OUTPUT);
pinMode(_clockPin,OUTPUT);
pinMode(_dataPin,OUTPUT);
_display();
}
void _loop(unsigned long currentMicros) override {
(void)currentMicros; // Not needed
if (!_xmitPending) return; // Nothing to do
#ifdef DIAG_IO
// We will create a DIAG on the fly
USB_SERIAL.print("<* DNOU8 ");
#endif
// stream out the bitmap (highest pin first)
_xmitPending=false;
digitalWrite(_latchPin, LOW);
for (int xmitBit=_nShiftBytes*8 -1; xmitBit>=0; xmitBit--) {
bool bit=GET_BIT(xmitBit);
#ifdef DIAG_IO
USB_SERIAL.print(bit?'1':'0');
#endif
digitalWrite(_dataPin,bit);
digitalWrite(_clockPin,HIGH);
digitalWrite(_clockPin,LOW);
}
digitalWrite(_latchPin, HIGH);
#ifdef DIAG_IO
USB_SERIAL.print(" *>\n");
#endif
}
void _write(VPIN vpin, int value) override {
int pin = vpin - _firstVpin;
bool oldval=GET_BIT(pin);
bool newval=value!=0;
if (newval==oldval) return; // no change
if (newval) SET_BIT(pin);
else CLR_BIT(pin);
_xmitPending=true; // shift register will be sent on next _loop()
}
int _read(VPIN vpin) override {
int pin = vpin - _firstVpin;
return GET_BIT(pin);
}
void _display() override {
DIAG(F("IO_DNOU8 Configured on VPins:%d-%d"), (int)_firstVpin,
(int)_firstVpin+_nPins-1);
}
private:
bool _xmitPending=false;
int _nShiftBytes=0;
VPIN _latchPin,_clockPin,_dataPin;
byte* _pinValues;
};
#endif