altos: Use PIO(6) on BTM to monitor BT connection. Fix BTM init.

PIo(6) appears to be an active-low indication of the Bluetooth
connection status. Hook this up using an interrupt to track the
link state instead of using in-band status messages.

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

1 files changed, 5 insertions, 0 deletions

diff --git a/src/ao.h b/src/ao.h
index 9b375894..dad1f3df 100644
--- a/src/ao.h
+++ b/src/ao.h
@@ -107,6 +107,7 @@ ao_start_scheduler(void);
 #define AO_PANIC_REBOOT		8	/* Reboot failed */
 #define AO_PANIC_FLASH		9	/* Invalid flash part (or wrong blocksize) */
 #define AO_PANIC_USB		10	/* Trying to send USB packet while busy */
+#define AO_PANIC_BT		11	/* Communications with bluetooth device failed */
 
 /* Stop the operating system, beeping and blinking the reason */
 void
@@ -1366,6 +1367,10 @@ ao_packet_slave_init(uint8_t enable);
 
 /* ao_btm.c */
 
+/* Shared by USB, so the USB code calls this function */
+void
+ao_btm_isr(void);
+
 void
 ao_btm_init(void);