1 files changed, 62 insertions, 0 deletions
diff --git a/src/core/ao_adc.h b/src/core/ao_adc.h
new file mode 100644
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+++ b/src/core/ao_adc.h
@@ -0,0 +1,62 @@
+/*
+ * Copyright © 2012 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#ifndef _AO_ADC_H_
+#define _AO_ADC_H_
+
+
+
+/*
+ * One set of samples read from the A/D converter or telemetry
+ */
+
+
+/*
+ * ao_adc.c
+ */
+
+#define ao_adc_ring_next(n)	(((n) + 1) & (AO_ADC_RING - 1))
+#define ao_adc_ring_prev(n)	(((n) - 1) & (AO_ADC_RING - 1))
+
+
+/*
+ * A/D data is stored in a ring, with the next sample to be written
+ * at ao_adc_head
+ */
+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
+ao_adc_poll(void);
+
+/* Suspend the current task until another A/D sample is converted */
+void
+ao_adc_sleep(void);
+
+/* Get a copy of the last complete A/D sample set */
+void
+ao_adc_get(__xdata struct ao_adc *packet);
+
+/* Initialize the A/D converter */
+void
+ao_adc_init(void);
+
+#endif /* _AO_ADC_H_ */