altos: Add delays to bt startup sequence

The BT device takes a few seconds after power-up before it is ready to
receive commands.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/ao_btm.c b/src/ao_btm.c
index 71907f869f9b80a670a5f876b8fc0e757db8f4db..4f56c382daa8cce6df8461f3ac8ab568b8b7a06c 100644 (file)
--- a/src/ao_btm.c
+++ b/src/ao_btm.c
@@ -249,6 +249,8 @@ ao_btm(void)
        ao_btm_stdio = ao_num_stdios - 1;
        ao_btm_echo(0);
 
+       ao_delay(AO_SEC_TO_TICKS(3));
+
        /*
         * The first time we connect, the BTM-180 comes up at 19200 baud.
         * After that, it will remember and come up at 57600 baud. So, see
@@ -256,6 +258,7 @@ ao_btm(void)
         * then tell it to switch to 57600 from 19200 baud.
         */
        while (!ao_btm_try_speed(AO_SERIAL_SPEED_57600)) {
+               ao_delay(AO_SEC_TO_TICKS(1));
                if (ao_btm_try_speed(AO_SERIAL_SPEED_19200))
                        ao_btm_cmd("ATL4\r");
                ao_delay(AO_SEC_TO_TICKS(1));