mos/dev/include/avr-adc.h

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//  This file is part of MOS, the MANTIS Operating System
//  See http://mantis.cs.colorado.edu/
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//  Copyright (c) 2002 - 2007 University of Colorado, Boulder
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#ifndef _AVR_ADC_H_
#define _AVR_ADC_H_


#define AVR_ADC_AVERAGING_ON 1
#define AVR_ADC_AVERAGING_OFF 2
//function prototype


uint16_t rssi_poll (void);

/* ADC clock prescaler values:
   (Slower conversion is more accurate and uses less power, but the
   conversion rate (clk. freq. / prescaler) should be at least 50 khz.)
*/
#define AVR_ADC_PRESCALE_2 0x00 // Fastest
#define AVR_ADC_PRESCALE_4 0x02 
#define AVR_ADC_PRESCALE_8 0x03 
#define AVR_ADC_PRESCALE_16 0x04        
#define AVR_ADC_PRESCALE_32 0x05        
#define AVR_ADC_PRESCALE_64 0x06 // Recommended level for 4mhz clock
#define AVR_ADC_PRESCALE_128 0x07 // Slowest

#define AVR_ADC_PRESCALE_MASK 0x07 // Register mask for setting prescaler

/* ADC voltage reference:
   (Either an internal voltage reference of 2.56v or the AVCC pin)
*/
#define AVR_ADC_VREF_AVCC 0x01 // AVCC 
#define AVR_ADC_VREF_IREF 0x03 // Internal 2.56v reference

#define AVR_ADC_VREF_MASK 0xC0 // Register mask for setting vref


/* ADC channel selection:
   (Selects which input pin to use for the conversion.)
*/
#define AVR_ADC_CH_0            0x00
#define AVR_ADC_CH_1            0x01
#define AVR_ADC_CH_2            0x02
#define AVR_ADC_CH_3            0x03
#define AVR_ADC_CH_4            0x04
#define AVR_ADC_CH_5            0x05
#define AVR_ADC_CH_6            0x06
#define AVR_ADC_CH_7            0x07

#define AVR_ADC_CH_MASK         0x07

#endif

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