mirror of
https://github.com/DCC-EX/CommandStation-EX.git
synced 2024-11-27 01:56:14 +01:00
56 lines
2.0 KiB
C
56 lines
2.0 KiB
C
|
/*
|
||
|
|
Copyright (C) 2016 Albert van Dalen http://www.avdweb.nl
|
||
|
|
This program 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.
|
||
|
|
This program 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 at http://www.gnu.org/licenses .
|
||
|
|
|
||
|
|
AUTHOR: Albert van Dalen
|
||
|
|
WEBSITE: http://www.avdweb.nl/arduino/libraries/fast-10-bit-adc.html
|
||
|
|
|
||
|
|
HISTORY:
|
||
|
|
1.0.0 7-3-2018 analogReadFast for SAMD21 (10/12bit) and AVR (10bit)
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef analogReadFast_H
|
||
|
|
#define analogReadFast_H
|
||
|
|
|
||
|
|
int inline analogReadFast(byte ADCpin);
|
||
|
|
|
||
|
|
#if defined(__arm__)
|
||
|
|
int inline analogReadFast(byte ADCpin) // inline library functions must be in header
|
||
|
|
{ ADC->CTRLA.bit.ENABLE = 0; // disable ADC
|
||
|
|
while( ADC->STATUS.bit.SYNCBUSY == 1 ); // wait for synchronization
|
||
|
|
|
||
|
|
int CTRLBoriginal = ADC->CTRLB.reg;
|
||
|
|
int AVGCTRLoriginal = ADC->AVGCTRL.reg;
|
||
|
|
int SAMPCTRLoriginal = ADC->SAMPCTRL.reg;
|
||
|
|
|
||
|
|
ADC->CTRLB.reg &= 0b1111100011111111; // mask PRESCALER bits
|
||
|
|
ADC->CTRLB.reg |= ADC_CTRLB_PRESCALER_DIV64; // divide Clock by 64
|
||
|
|
ADC->AVGCTRL.reg = ADC_AVGCTRL_SAMPLENUM_1 | // take 1 sample
|
||
|
|
ADC_AVGCTRL_ADJRES(0x00ul); // adjusting result by 0
|
||
|
|
ADC->SAMPCTRL.reg = 0x00; // sampling Time Length = 0
|
||
|
|
|
||
|
|
ADC->CTRLA.bit.ENABLE = 1; // enable ADC
|
||
|
|
while(ADC->STATUS.bit.SYNCBUSY == 1); // wait for synchronization
|
||
|
|
|
||
|
|
int adc = analogRead(ADCpin);
|
||
|
|
|
||
|
|
ADC->CTRLB.reg = CTRLBoriginal;
|
||
|
|
ADC->AVGCTRL.reg = AVGCTRLoriginal;
|
||
|
|
ADC->SAMPCTRL.reg = SAMPCTRLoriginal;
|
||
|
|
|
||
|
|
return adc;
|
||
|
|
}
|
||
|
|
#else
|
||
|
|
int inline analogReadFast(byte ADCpin)
|
||
|
|
{ byte ADCSRAoriginal = ADCSRA;
|
||
|
|
ADCSRA = (ADCSRA & B11111000) | 4;
|
||
|
|
int adc = analogRead(ADCpin);
|
||
|
|
ADCSRA = ADCSRAoriginal;
|
||
|
|
return adc;
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
#endif
|