+ ao_serial_set_speed(AO_SERIAL_SPEED_4800);
+ for (i = 0; i < 16; i++)
+ ao_serial_putchar(0x00);
+ for (i = 0; i < sizeof (ao_gps_set_nmea) - 1; i++)
+ ao_serial_putchar(ao_gps_set_nmea[i]);
+ ao_serial_set_speed(AO_SERIAL_SPEED_57600);
+ for (i = 0; i < 16; i++)
+ ao_serial_putchar(0x00);
+}
+
+static const char ao_gps_set_message_rate[] = {
+ 0xa0, 0xa2, 0x00, 0x08,
+ 166,
+ 0,
+};
+
+void
+ao_sirf_set_message_rate(uint8_t msg, uint8_t rate)
+{
+ uint16_t cksum = 0x00a6;
+ uint8_t i;
+
+ for (i = 0; i < sizeof (ao_gps_set_message_rate); i++)
+ ao_serial_putchar(ao_gps_set_message_rate[i]);
+ ao_serial_putchar(msg);
+ ao_serial_putchar(rate);
+ cksum = 0xa6 + msg + rate;
+ for (i = 0; i < 4; i++)
+ ao_serial_putchar(0);
+ ao_serial_putchar((cksum >> 8) & 0x7f);
+ ao_serial_putchar(cksum & 0xff);
+ ao_serial_putchar(0xb0);
+ ao_serial_putchar(0xb3);
+}
+
+static const uint8_t sirf_disable[] = {
+ 2,
+ 4,
+ 9,
+ 10,
+ 27,
+ 50,
+ 52,
+};
+
+void
+ao_gps(void) __reentrant
+{
+ uint8_t i, k;