[usb] prevent start of log when usb storage is running

sw/airborne/firmwares/fixedwing/chibios-libopencm3/chibios_init.c

@@ -92,7 +92,10 @@ static __attribute__((noreturn)) msg_t thd_heartbeat(void *arg)
   chRegSetThreadName("pprz heartbeat");
 
   chThdSleepSeconds (SDLOG_START_DELAY);
-  sdOk = chibios_logInit(true);
+  if (usbStorageIsItRunning ()) 
+    chThdSleepSeconds (20000); // stuck here for hours
+  else 
+    sdOk = chibios_logInit(true);
 
   while (TRUE) {
     palTogglePad (GPIOC, GPIOC_LED3);

sw/airborne/subsystems/chibios-libopencm3/usbStorage.c

@@ -37,6 +37,7 @@ static msg_t    thdUsbStorage(void *arg);
 static Thread*	usbStorageThreadPtr=NULL;
 /* USB mass storage driver */
 static USBMassStorageDriver UMSD1;
+static bool_t isRunning = false;
 
 /* endpoint index */
 #define USB_MS_DATA_EP 1
@@ -297,7 +298,7 @@ static msg_t     thdUsbStorage(void *arg)
 
     chThdSleepMilliseconds(20);
   }
-
+  isRunning = true;
   chRegSetThreadName("UsbStorage:connected");
 
   chibios_logFinish ();
@@ -331,3 +332,8 @@ static msg_t     thdUsbStorage(void *arg)
   MCU_RESTART();
   return RDY_OK;
 }
+
+bool_t usbStorageIsItRunning (void)
+{
+  return isRunning;
+}

sw/airborne/subsystems/chibios-libopencm3/usbStorage.h

@@ -25,6 +25,7 @@
  */
 #pragma once
 
-void usbStorageStartPolling (void);
-void usbStorageStop  (void);
-void usbStorageWaitForDeconnexion (void);
+void   usbStorageStartPolling (void);
+void   usbStorageStop  (void);
+void   usbStorageWaitForDeconnexion (void);
+bool_t usbStorageIsItRunning (void);