[nrf52840] remove startup delay after software reset in USB driver (#2637)

Signed-off-by: Robert Lubos <[email protected]>

examples/platforms/nrf52840/platform-config.h

@@ -317,16 +317,6 @@
 #define LOG_TIMESTAMP_ENABLE 1
 #endif
 
-/**
- * @def USB_INITIAL_DELAY_MS
- *
- * Init delay for USB driver, used when software reset was detected to help OS to re-enumerate the device.
- *
- */
-#ifndef USB_INITIAL_DELAY_MS
-#define USB_INITIAL_DELAY_MS 600
-#endif
-
 /**
  * @def USB_HOST_UART_CONFIG_DELAY_MS
  *

examples/platforms/nrf52840/usb-cdc-uart.c

@@ -205,13 +205,6 @@ static void processConnection(void)
     // Provide some delay so the OS can re-enumerate the device in case of reset.
     if (sUsbState.mReadyToStart)
     {
-        if (((otPlatGetResetReason(NULL) == OT_PLAT_RESET_REASON_EXTERNAL) ||
-             (otPlatGetResetReason(NULL) == OT_PLAT_RESET_REASON_SOFTWARE)) &&
-            (otPlatAlarmMilliGetNow() < USB_INITIAL_DELAY_MS))
-        {
-            return;
-        }
-
         sUsbState.mReadyToStart = false;
 
         if (nrf_drv_usbd_is_enabled())