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-rw-r--r--usbdrv/usbdrv.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/usbdrv/usbdrv.h b/usbdrv/usbdrv.h
index b77b984..6093c8c 100644
--- a/usbdrv/usbdrv.h
+++ b/usbdrv/usbdrv.h
@@ -388,7 +388,9 @@ extern volatile schar usbRxLen;
*/
#define USB_PROP_IS_DYNAMIC (1 << 14)
/* If this property is set for a descriptor, usbFunctionDescriptor() will be
- * used to obtain the particular descriptor.
+ * used to obtain the particular descriptor. Data directly returned via
+ * usbMsgPtr are FLASH data by default, combine (OR) with USB_PROP_IS_RAM to
+ * return RAM data.
*/
#define USB_PROP_IS_RAM (1 << 15)
/* If this property is set for a descriptor, the data is read from RAM