--- /dev/null
+/*
+ * 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.
+ */
+
+#include <ao.h>
+
+#define mid(time) ao_led_for(AO_LED_REPORT, time)
+#define pause(time) ao_delay(time)
+
+static void
+ao_report_digit(uint8_t digit) __reentrant
+{
+ if (!digit) {
+ mid(AO_MS_TO_TICKS(1000));
+ pause(AO_MS_TO_TICKS(300));
+ } else {
+ while (digit--) {
+ mid(AO_MS_TO_TICKS(300));
+ pause(AO_MS_TO_TICKS(300));
+ }
+ }
+ pause(AO_MS_TO_TICKS(1000));
+}
+
+void
+ao_report_altitude(void)
+{
+ __pdata alt_t agl = ao_max_height;
+ static __xdata uint8_t digits[11];
+ __pdata uint8_t ndigits, i;
+
+ if (agl < 0)
+ agl = 0;
+ ndigits = 0;
+ do {
+ digits[ndigits++] = agl % 10;
+ agl /= 10;
+ } while (agl);
+
+ i = ndigits;
+ do
+ ao_report_digit(digits[--i]);
+ while (i != 0);
+}