1 files changed, 92 insertions, 0 deletions
diff --git a/src/ao_adc.c b/src/ao_adc.c
new file mode 100644
index 00000000..26209dcf
--- /dev/null
+++ b/src/ao_adc.c
@@ -0,0 +1,92 @@
+/*
+ * 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; 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.
+ */
+
+#include "ao.h"
+
+volatile __xdata struct ao_adc	ao_adc_ring[AO_ADC_RING];
+volatile __data uint8_t		ao_adc_head;
+
+void
+ao_adc_poll(void)
+{
+	ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | 0;
+}
+
+void
+ao_adc_sleep(void)
+{
+	ao_sleep(&ao_adc_ring);
+}
+
+void
+ao_adc_get(__xdata struct ao_adc *packet)
+{
+	uint8_t	i = ao_adc_ring_prev(ao_adc_head);
+	memcpy(packet, &ao_adc_ring[i], sizeof (struct ao_adc));
+}
+
+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 = ao_adc_ring_next(ao_adc_head);
+		ao_wakeup(ao_adc_ring);
+	}
+}
+
+static void
+ao_adc_dump(void)
+{
+	__xdata struct ao_adc	packet;
+	ao_adc_get(&packet);
+	printf("tick: %5u accel: %4d pres: %4d temp: %4d batt: %4d drogue: %4d main: %4d\n",
+	       packet.tick, packet.accel >> 4, packet.pres >> 4, packet.temp >> 4,
+	       packet.v_batt >> 4, packet.sense_d >> 4, packet.sense_m >> 4);
+}
+
+__code struct ao_cmds ao_adc_cmds[] = {
+	{ 'a',	ao_adc_dump,	"a                                  Display current ADC values" },
+	{ 0,	ao_adc_dump, NULL },
+};
+
+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;
+	ao_cmd_register(&ao_adc_cmds[0]);
+}