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https://github.com/RfidResearchGroup/ChameleonMini.git
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52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/*
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* AntennaLevel.h
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*
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* Created on: 24.11.2013
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* Author: skuser
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*/
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#ifndef ANTENNALEVEL_H_
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#define ANTENNALEVEL_H_
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#include "Common.h"
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#define ANTENNA_LEVEL_R1 10E3
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#define ANTENNA_LEVEL_R2 220E0
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#define ANTENNA_LEVEL_VREF 1.0
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#define ANTENNA_LEVEL_RES 4096
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#define ANTENNA_LEVEL_OFFSET 190 /* LSB */
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#define ANTENNA_LEVEL_MILLIVOLT 1E3
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#define ANTENNA_LEVEL_FACTOR (ANTENNA_LEVEL_VREF * (ANTENNA_LEVEL_R1 + ANTENNA_LEVEL_R2) / (ANTENNA_LEVEL_RES * ANTENNA_LEVEL_R2) )
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#define ANTENNA_LEVEL_SCALE ((uint32_t) 1<<16)
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#define ANTENNA_LEVEL_NUMERATOR ((uint32_t) (ANTENNA_LEVEL_MILLIVOLT * ANTENNA_LEVEL_FACTOR * ANTENNA_LEVEL_SCALE + .5))
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#define ANTENNA_LEVEL_DENOMINATOR (ANTENNA_LEVEL_SCALE)
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static inline
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void AntennaLevelInit(void)
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{
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ADCA.CTRLA = ADC_ENABLE_bm;
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ADCA.CTRLB = ADC_RESOLUTION_12BIT_gc;
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ADCA.REFCTRL = ADC_REFSEL_INT1V_gc | ADC_BANDGAP_bm;
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ADCA.PRESCALER = ADC_PRESCALER_DIV32_gc;
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ADCA.CH0.CTRL = ADC_CH_INPUTMODE_SINGLEENDED_gc;
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ADCA.CH0.MUXCTRL = ADC_CH_MUXPOS_PIN7_gc;
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}
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static inline
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uint16_t AntennaLevelGet(void)
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{
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ADCA.CH0.CTRL |= ADC_CH_START_bm;
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while( !(ADCA.CH0.INTFLAGS & ADC_CH_CHIF_bm) );
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ADCA.CH0.INTFLAGS = ADC_CH_CHIF_bm;
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int16_t Result = ADCA.CH0RES - ANTENNA_LEVEL_OFFSET;
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if (Result < 0) Result = 0;
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return (uint16_t) (((uint32_t) Result * ANTENNA_LEVEL_NUMERATOR) / ANTENNA_LEVEL_DENOMINATOR);
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}
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#endif /* ANTENNALEVEL_H_ */
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