pbio/drv/bluetooth: Don't wait on power initialization.

Since all Bluetooth commands are buffered and handled by the event loop, we don't need to wait for the driver to fully power on before leaving `pbdrv`.

This allows power on to complete in the background while we initialize pbio and do hmi boot animations in pbsys, saving about half the boot time on SPIKE Prime.

Author: laurensvalk

lib/pbio/drv/bluetooth/bluetooth.c

@@ -66,7 +66,6 @@ void pbdrv_bluetooth_init(void) {
     // as soon as the previous one completes + 1 byte for ring buf pointer
     static uint8_t stdout_buf[PBDRV_BLUETOOTH_MAX_CHAR_SIZE * 2 + 1];
     lwrb_init(&stdout_ring_buf, stdout_buf, PBIO_ARRAY_SIZE(stdout_buf));
-    pbio_busy_count_up();
 
     pbdrv_bluetooth_init_hci();
 }
@@ -435,8 +434,6 @@ pbio_error_t pbdrv_bluetooth_process_thread(pbio_os_state_t *state, void *contex
 
     DEBUG_PRINT("Bluetooth is now on and initialized.\n");
 
-    pbio_busy_count_down();
-
     pbio_os_timer_set(&status_timer, PBDRV_BLUETOOTH_STATUS_UPDATE_INTERVAL);
 
     // Service scheduled tasks as long as Bluetooth is enabled.

lib/pbio/test/sys/test_bluetooth.c

@@ -26,12 +26,16 @@ static pbio_error_t test_bluetooth(pbio_os_state_t *state, void *context) {
 
     pbsys_host_init();
 
-    // power should be initialized by the time pbdrv completes.
-    tt_want_uint_op(pbio_test_bluetooth_get_control_state(), ==, PBIO_TEST_BLUETOOTH_STATE_ON);
+    // power should be initialized to off
+    tt_want_uint_op(pbio_test_bluetooth_get_control_state(), ==, PBIO_TEST_BLUETOOTH_STATE_OFF);
 
+    // Power is still off, but it should be possible to schedule this command.
     pbdrv_bluetooth_start_advertising(true);
     PBIO_OS_AWAIT(state, &sub, pbdrv_bluetooth_await_advertise_or_scan_command(&sub, NULL));
 
+    // power should be initialized by the time any command completes.
+    tt_want_uint_op(pbio_test_bluetooth_get_control_state(), ==, PBIO_TEST_BLUETOOTH_STATE_ON);
+
     tt_want(pbio_test_bluetooth_is_advertising_enabled());
 
     pbio_test_bluetooth_connect();