Fix preserve pairing on power cycle

bt_device.c

@@ -51,8 +51,6 @@ void btstack_main(void){
 	bt_hid_setup();
 
 	init_report_buf();
-
-	hci_power_control(HCI_POWER_ON);
 }
 
 static void bt_hid_setup(void) {

main.c

@@ -16,9 +16,12 @@ static void usb_main(void);
 
 // main loop
 int main(void) {
-
+	// for PIO USB, we want clock speed to be multiple of 12MHz
 	set_sys_clock_khz(144000, true);
 
+	// need so BTstack can save pairing information to flash
+	flash_safe_execute_core_init();
+
 	sleep_ms(10);
 
 	// run BLE on core 1

usb_host.c

@@ -18,7 +18,7 @@
 host_state_t host_state;
 static absolute_time_t request_time;
 static absolute_time_t last_report;
-static uint16_t host_poll_interval=8000;
+static uint16_t host_poll_interval=HOST_POLL_INTERVAL;
 
 // initialize usb host
 void usb_host_init(void) {

usb_host.h

@@ -1,7 +1,7 @@
 #ifndef USB_HOST_H_
 #define USB_HOST_H_
 
-#define HOST_POLL_INTERVAL	25000
+#define HOST_POLL_INTERVAL	8000
 
 typedef enum {
 	HOST_INACTIVE=0,