Don't spam device while waiting for MSC unit ready

Conflicts:
	Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/MSC/Src/usbh_msc.c

Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/MSC/Inc/usbh_msc.h

@@ -52,6 +52,7 @@ typedef enum
   MSC_READ_CAPACITY10,
   MSC_READ_INQUIRY,
   MSC_REQUEST_SENSE,
+  MSC_REQUEST_SENSE_WAIT_RETRY,
   MSC_READ,
   MSC_WRITE,
   MSC_UNRECOVERED_ERROR,  
@@ -118,6 +119,7 @@ typedef struct _MSC_Process
   uint16_t                  current_lun;
   uint16_t                  rw_lun;
   uint32_t                  timeout;
+  uint32_t                  retry_timeout;
   MSC_RdWrCompleteCallback  RdWrCompleteCallback;
 }
 MSC_HandleTypeDef; 
@@ -145,6 +147,10 @@ MSC_HandleTypeDef;
 /* Interface Descriptor field values for MSC Protocol */
 #define MSC_BOT                                        0x50 
 #define MSC_TRANSPARENT                                0x06
+
+#define MSC_STARTUP_TIMEOUT_MS          15000
+#define MSC_STARTUP_RETRY_TIME_MS       100
+
 /**
   * @}
   */ 

Downstream/Middlewares/ST/STM32_USB_Host_Library/Class/MSC/Src/usbh_msc.c

@@ -453,10 +453,10 @@ static USBH_StatusTypeDef USBH_MSC_Process(USBH_HandleTypeDef *phost)
           if((MSC_Handle->unit[MSC_Handle->current_lun].sense.key == SCSI_SENSE_KEY_UNIT_ATTENTION) ||
              (MSC_Handle->unit[MSC_Handle->current_lun].sense.key == SCSI_SENSE_KEY_NOT_READY) )   
           {
-            
-            if((phost->Timer - MSC_Handle->timeout) < 10000)
+            if((HAL_GetTick() - MSC_Handle->timeout) < MSC_STARTUP_TIMEOUT_MS)
             {
-              MSC_Handle->unit[MSC_Handle->current_lun].state = MSC_TEST_UNIT_READY;
+              MSC_Handle->retry_timeout = HAL_GetTick();
+              MSC_Handle->unit[MSC_Handle->current_lun].state = MSC_REQUEST_SENSE_WAIT_RETRY;
               break;
             }        
           }
@@ -479,6 +479,13 @@ static USBH_StatusTypeDef USBH_MSC_Process(USBH_HandleTypeDef *phost)
         }
         break;
 
+      case MSC_REQUEST_SENSE_WAIT_RETRY:
+          if ((HAL_GetTick() - MSC_Handle->retry_timeout) > MSC_STARTUP_RETRY_TIME_MS)
+          {
+              MSC_Handle->unit[MSC_Handle->current_lun].state = MSC_TEST_UNIT_READY;
+          }
+          break;
+    
       case MSC_UNRECOVERED_ERROR: 
         MSC_Handle->current_lun++;
         break;