| 1 | #ifndef __AD7719_ADC_H
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| 2 | #define __AD7719_ADC_H
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| 3 | //-----------------------------------------------------------------------------
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| 4 |
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| 5 | #include "typedefs.h"
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| 6 | #include "application.h"
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| 7 | #include "num_conversion.h"
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| 8 | //-----------------------------------------------------------------------------
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| 9 | // Bit Definitions
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| 10 | #define ADC_RDY PD2
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| 11 | #define ADC_RST PB1
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| 12 | #define AD7719_IS_READY() (!(PIND & (1<<PD2))) // TRUE if PD2=0 AD_RDY is inverted logic.
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| 13 |
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| 14 |
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| 15 |
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| 16 |
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| 17 |
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| 18 | // ON CHIP REGISTER ADDRESSES
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| 19 | #define STATUS_RD 0x40
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| 20 |
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| 21 | #define MODE_WR 0x01
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| 22 | #define MODE_RD 0x41
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| 23 |
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| 24 | #define AD0CON_WR 0x02
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| 25 | #define AD0CON_RD 0x42
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| 26 |
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| 27 | #define AD1CON_WR 0x03
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| 28 | #define AD1CON_RD 0x43
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| 29 |
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| 30 | #define FILTER_WR 0x04
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| 31 | #define FILTER_RD 0x44
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| 32 |
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| 33 | #define AD0DAT_RD 0x45
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| 34 | #define AD1DAT_RD 0x46
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| 35 |
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| 36 | #define IOCON_WR 0x07
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| 37 | #define IOCON_RD 0x47
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| 38 |
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| 39 | #define AD0OFS_WR 0x08
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| 40 | #define AD0OFS_RD 0x48
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| 41 |
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| 42 | #define AD1OFS_WR 0x09
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| 43 | #define AD1OFS_RD 0x49
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| 44 |
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| 45 | #define AD0GAIN_WR 0x0A
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| 46 | #define AD0GAIN_RD 0x4A
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| 47 |
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| 48 | #define AD1GAIN_WR 0x0B
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| 49 | #define AD1GAIN_RD 0x4B
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| 50 |
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| 51 | #define ID_RD 0x4F
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| 52 |
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| 53 | // REGISTER INIT VALUES
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| 54 |
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| 55 | //Init Configure and Initialize AD7719
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| 56 | //http://designtools.analog.com/dt/adc/codegen/ad7719.html
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| 57 |
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| 58 | #define IOCON_INIT_HIGH 0x03 //0000.0011 // I-sources I1 and I2 are switched on, thats all
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| 59 | #define IOCON_INIT_LOWBYTE 0x00
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| 60 |
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| 61 | #define FILTER_INIT 0x52 //0x52 euro use 50Hz = -171dB and 60Hz = -58dB Rejectjon Updaterate = 4Hz
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| 62 | // 0x52=82 decimal. f_ADC=16.6Hz; t_ADC=60ms; t_settle = 120ms
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| 63 |
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| 64 | #define AD1CON_INIT 0x31 //0011.0001
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| 65 | // AD1EN is set --> AUX ADc is used for Temp measurement.
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| 66 | // ACH = 011 --> Tempsensor
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| 67 | // U/#B = 0 --> bipolar, but i'm not entirely sure if this is correct.
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| 68 | // ARN = 1 --> input range is REFIN2 , but when tempsensor is chosen, internal ref is used ...
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| 69 |
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| 70 | #define AD0CON_INIT 0x8E // 1000.1110
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| 71 | // AD0EN is set
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| 72 | // WL is cleared --> 24bit
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| 73 | // CH = 00 --> AIN1 , AIN2 used
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| 74 | // U/#B = 1 --> unipolar
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| 75 | // RN=110 --> input range = +-1.28V --> whatever this means in ratiometric measurements.
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| 76 |
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| 77 |
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| 78 | #define MODE_IDLE 0x01
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| 79 | #define MODE_SINGLE 0x02
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| 80 | #define MODE_CONT 0x03
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| 81 | #define MODE_INTERNAL_ZERO_CAL 0x04 // not tested
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| 82 | #define MODE_INTERNAL_FULL_CAL 0x05 // not tested
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| 83 |
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| 84 | // since the ADC is chopped, one should wait 3 conversions
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| 85 | // after the muxer was switched, until the reading is okay.
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| 86 | #define READINGS_UNTIL_AD7719_SETTLED 3
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| 87 |
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| 88 | void ad7719_init(void);
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| 89 | void startconv(U08 continuous);
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| 90 | void stopconv(void);
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| 91 | U32 read_adc(void);
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| 92 | //-----------------------------------------------------------------------------
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| 93 | #endif
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