altos: Sample the accelerometer reference voltage on v1.1 boards

This places the 5v reference samples in an array parallel to the basic
ADC values. It doesn't do anything with the values, just stores them.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/ao.h b/src/ao.h
index abac22a3..cef20e61 100644
--- a/src/ao.h
+++ b/src/ao.h
@@ -163,6 +163,11 @@ struct ao_adc {
 #endif
 
 #if HAS_ADC
+
+#ifndef HAS_ACCEL_REF
+#error Please define HAS_ACCEL_REF
+#endif
+
 /*
  * ao_adc.c
  */
@@ -178,6 +183,9 @@ struct ao_adc {
  */
 extern volatile __xdata struct ao_adc	ao_adc_ring[AO_ADC_RING];
 extern volatile __data uint8_t		ao_adc_head;
+#if HAS_ACCEL_REF
+extern volatile __xdata uint16_t	ao_accel_ref[AO_ADC_RING];
+#endif
 
 /* Trigger a conversion sequence (called from the timer interrupt) */
 void