nrf52dk; add defines to turn on rapid led toggling when in
serial bootloader.
@@ -50,6 +50,9 @@ extern uint8_t _ram_start;
#define BOOT_SERIAL_DETECT_PIN 13 /* Button 1 */
#define BOOT_SERIAL_DETECT_PIN_CFG HAL_GPIO_PULL_UP
#define BOOT_SERIAL_DETECT_PIN_VAL 0
+
+#define BOOT_SERIAL_REPORT_PIN LED_BLINK_PIN
+#define BOOT_SERIAL_REPORT_FREQ (MYNEWT_VAL(OS_CPUTIME_FREQ) / 4)
#endif
#define NFFS_AREA_MAX (8)
