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fw/accel.c (measure_ref): GND and Vbg measurement function (for diagnostics)

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This commit is contained in:
Werner Almesberger 2012-07-01 10:35:29 -03:00
parent a4eeb43963
commit 1be433e65f
2 changed files with 14 additions and 0 deletions
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13
fw/accel.c
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@ -50,6 +50,19 @@ static inline void adcsra(bool start)
} }
uint16_t measure_ref(bool gnd)
{
while (ADCSRA & (1 << ADSC));
adcsra(0);
ADMUX =
1 << REFS0 | /* Vref is AVcc */
(gnd ? 15 : 14); /* GND (0 V) or Vbg (1.1 V) */
adcsra(1);
while (ADCSRA & (1 << ADSC));
return ADC;
}
ISR(ADC_vect) ISR(ADC_vect)
{ {
uint16_t v; uint16_t v;

1
fw/accel.h
View File

@ -21,6 +21,7 @@
extern void (*sample)(bool x, uint16_t v); extern void (*sample)(bool x, uint16_t v);
uint16_t measure_ref(bool gnd);
void accel_start(void); void accel_start(void);
#endif /* !ACCEL_H */ #endif /* !ACCEL_H */