mirror of
https://github.com/LuiCat/ArduinoTaikoController.git
synced 2024-12-21 19:05:55 +01:00
70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
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#include "AnalogReadNow.h"
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#include "wiring_private.h"
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#include "pins_arduino.h"
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void analogSwitchPin(uint8_t pin)
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{
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#if defined(analogPinToChannel)
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#if defined(__AVR_ATmega32U4__)
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if (pin >= 18) pin -= 18; // allow for channel or pin numbers
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#endif
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pin = analogPinToChannel(pin);
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#elif defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
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if (pin >= 54) pin -= 54; // allow for channel or pin numbers
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#elif defined(__AVR_ATmega32U4__)
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if (pin >= 18) pin -= 18; // allow for channel or pin numbers
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#elif defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__) || defined(__AVR_ATmega644__) || defined(__AVR_ATmega644A__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega644PA__)
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if (pin >= 24) pin -= 24; // allow for channel or pin numbers
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#else
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if (pin >= 14) pin -= 14; // allow for channel or pin numbers
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#endif
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#if defined(ADCSRB) && defined(MUX5)
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// the MUX5 bit of ADCSRB selects whether we're reading from channels
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// 0 to 7 (MUX5 low) or 8 to 15 (MUX5 high).
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ADCSRB = (ADCSRB & ~(1 << MUX5)) | (((pin >> 3) & 0x01) << MUX5);
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#endif
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// set the analog reference (high two bits of ADMUX) and select the
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// channel (low 4 bits). this also sets ADLAR (left-adjust result)
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// to 0 (the default).
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#if defined(ADMUX)
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#if defined(__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
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ADMUX = (DEFAULT << 4) | (pin & 0x07);
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#else
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ADMUX = (DEFAULT << 6) | (pin & 0x07);
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#endif
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#endif
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// without a delay, we seem to read from the wrong channel
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//delay(1);
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#if defined(ADCSRA) && defined(ADCL)
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// start the conversion
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sbi(ADCSRA, ADSC);
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#endif
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}
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int analogReadNow()
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{
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#if defined(ADCSRA) && defined(ADCL)
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// ADSC is cleared when the conversion finishes
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while (bit_is_set(ADCSRA, ADSC));
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// we have to read ADCL first; doing so locks both ADCL
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// and ADCH until ADCH is read. reading ADCL second would
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// cause the results of each conversion to be discarded,
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// as ADCL and ADCH would be locked when it completed.
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uint8_t low, high;
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low = ADCL;
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high = ADCH;
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// combine the two bytes
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return (high << 8) | low;
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#else
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// we dont have an ADC, return 0
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return 0;
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#endif
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}
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