mirror of
https://github.com/DCC-EX/CommandStation-EX.git
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56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
/*
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Copyright (C) 2016 Albert van Dalen http://www.avdweb.nl
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This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License at http://www.gnu.org/licenses .
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AUTHOR: Albert van Dalen
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WEBSITE: http://www.avdweb.nl/arduino/libraries/fast-10-bit-adc.html
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HISTORY:
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1.0.0 7-3-2018 analogReadFast for SAMD21 (10/12bit) and AVR (10bit)
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*/
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#ifndef analogReadFast_H
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#define analogReadFast_H
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int inline analogReadFast(byte ADCpin);
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#if defined(__arm__)
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int inline analogReadFast(byte ADCpin) // inline library functions must be in header
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{ ADC->CTRLA.bit.ENABLE = 0; // disable ADC
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while( ADC->STATUS.bit.SYNCBUSY == 1 ); // wait for synchronization
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int CTRLBoriginal = ADC->CTRLB.reg;
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int AVGCTRLoriginal = ADC->AVGCTRL.reg;
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int SAMPCTRLoriginal = ADC->SAMPCTRL.reg;
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ADC->CTRLB.reg &= 0b1111100011111111; // mask PRESCALER bits
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ADC->CTRLB.reg |= ADC_CTRLB_PRESCALER_DIV64; // divide Clock by 64
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ADC->AVGCTRL.reg = ADC_AVGCTRL_SAMPLENUM_1 | // take 1 sample
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ADC_AVGCTRL_ADJRES(0x00ul); // adjusting result by 0
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ADC->SAMPCTRL.reg = 0x00; // sampling Time Length = 0
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ADC->CTRLA.bit.ENABLE = 1; // enable ADC
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while(ADC->STATUS.bit.SYNCBUSY == 1); // wait for synchronization
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int adc = analogRead(ADCpin);
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ADC->CTRLB.reg = CTRLBoriginal;
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ADC->AVGCTRL.reg = AVGCTRLoriginal;
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ADC->SAMPCTRL.reg = SAMPCTRLoriginal;
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return adc;
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}
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#else
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int inline analogReadFast(byte ADCpin)
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{ byte ADCSRAoriginal = ADCSRA;
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ADCSRA = (ADCSRA & B11111000) | 4;
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int adc = analogRead(ADCpin);
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ADCSRA = ADCSRAoriginal;
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return adc;
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}
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#endif
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#endif
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