X-Git-Url: https://git.gag.com/?p=fw%2Faltos;a=blobdiff_plain;f=ao_adc.c;fp=ao_adc.c;h=d45e10b1f7de252000ff0ad9066f67bd879ced0a;hp=0000000000000000000000000000000000000000;hb=e14f07bfdb8824fc7ed6df1129c66ee39ffd6d54;hpb=823f4f92de0c1f8dd7a644a8e56ffe9822bee6e2

diff --git a/ao_adc.c b/ao_adc.c
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+++ b/ao_adc.c
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+/*
+ * Copyright © 2009 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include "ao.h"
+
+__xdata struct ao_adc	ao_adc_ring[ADC_RING];
+__data uint8_t		ao_adc_head;
+
+void ao_adc_isr(void) interrupt 1
+{
+	uint8_t sequence;
+	uint8_t	__xdata *a;
+	
+	sequence = (ADCCON2 & ADCCON2_SCH_MASK) >> ADCCON2_SCH_SHIFT;
+	a = (uint8_t __xdata *) (&ao_adc_ring[ao_adc_head].accel + sequence);
+	a[0] = ADCL;
+	a[1] = ADCH;
+	if (sequence < 5) {
+		/* start next channel conversion */
+		ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | (sequence + 1);
+	} else {
+		/* record this conversion series */
+		ao_adc_ring[ao_adc_head].tick = ao_time;
+		ao_adc_head++;
+		if (ao_adc_head == ADC_RING)
+			ao_adc_head = 0;
+		ao_wakeup(ao_adc_ring);
+	}
+}
+
+void ao_adc_init(void)
+{
+	ADCCFG = ((1 << 0) |	/* acceleration */
+		  (1 << 1) |	/* pressure */
+		  (1 << 2) |	/* temperature */
+		  (1 << 3) |	/* battery voltage */
+		  (1 << 4) |	/* drogue sense */
+		  (1 << 5));	/* main sense */
+	
+	/* enable interrupts */
+	ADCIF = 0;
+	IEN0 |= IEN0_ADCIE;
+}
+
+void ao_adc_poll(void)
+{
+	ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 0;
+}
+
+void ao_adc_get(__xdata struct ao_adc *packet)
+{
+	uint8_t	i = ao_adc_head;
+	if (i == 0)
+		i = ADC_RING;
+	i--;
+	memcpy(packet, &ao_adc_ring[i], sizeof (struct ao_adc));
+}
+