root / toolbox / current.c @ 10936c07
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| 1 | 10936c07 | Tom Mullins | #include "current.h" |
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| 2 | #include <avr/io.h> |
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| 3 | |||
| 4 | void current_init() {
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| 5 | /*
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| 6 | * REFS = 0, Vcc reference (set to 2 for internal 1.1V reference)
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| 7 | * MUX = 8, PB3(ADC8)
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| 8 | */
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| 9 | ADMUX = _BV(MUX3); |
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| 10 | /* TODO reduce power consumption with DIDR* */
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| 11 | /*
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| 12 | * ADLAR = 0, right adjust result
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| 13 | * ADTS = 0, free running mode
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| 14 | */
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| 15 | ADCSRB = 0;
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| 16 | /*
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| 17 | * ADEN = 1, enable
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| 18 | * ADSC = 1, start now
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| 19 | * ADATE = 1, auto trigger
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| 20 | * ADIE = 0, disable interrupt
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| 21 | * ADPS = 3, prescale clock by 8
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| 22 | */
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| 23 | ADCSRA |= _BV(ADEN) | _BV(ADSC) | _BV(ADATE) | _BV(ADPS1) | _BV(ADPS0); |
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| 24 | } |
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| 25 | |||
| 26 | int current_read() {
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| 27 | return ADC;
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| 28 | } |