+static void
+ao_report_digit(uint8_t digit) __reentrant
+{
+ if (!digit) {
+ signal(AO_MS_TO_TICKS(500));
+ pause(AO_MS_TO_TICKS(200));
+ } else {
+ while (digit--) {
+ signal(AO_MS_TO_TICKS(200));
+ pause(AO_MS_TO_TICKS(200));
+ }
+ }
+ pause(AO_MS_TO_TICKS(300));
+}
+
+static void
+ao_report_altitude(void)
+{
+ __xdata int16_t agl = ao_pres_to_altitude(ao_min_pres) - ao_pres_to_altitude(ao_ground_pres);
+ __xdata uint8_t digits[10];
+ __xdata uint8_t ndigits, i;
+
+ if (agl < 0)
+ agl = 0;
+ ndigits = 0;
+ do {
+ digits[ndigits++] = agl % 10;
+ agl /= 10;
+ } while (agl);
+
+ for (;;) {
+ ao_report_beep();
+ i = ndigits;
+ do
+ ao_report_digit(digits[--i]);
+ while (i != 0);
+ pause(AO_SEC_TO_TICKS(5));
+ }
+}
+