Add file-level brief documentation.

[pub/USBasp.git] / LUFA / Drivers / USB / Class / Host / StillImage.c

diff --git a/LUFA/Drivers/USB/Class/Host/StillImage.c b/LUFA/Drivers/USB/Class/Host/StillImage.c
index d116ceb..50be7d6 100644 (file)
--- a/LUFA/Drivers/USB/Class/Host/StillImage.c
+++ b/LUFA/Drivers/USB/Class/Host/StillImage.c
@@ -151,7 +151,8 @@ uint8_t SImage_Host_SendBlockHeader(USB_ClassInfo_SI_Host_t* const SIInterfaceIn
        if ((USB_HostState != HOST_STATE_Configured) || !(SIInterfaceInfo->State.IsActive))\r
          return PIPE_RWSTREAM_DeviceDisconnected;\r
 \r
-       PIMAHeader->TransactionID = SIInterfaceInfo->State.TransactionID++;\r
+       if (SIInterfaceInfo->State.IsSessionOpen)\r
+         PIMAHeader->TransactionID = SIInterfaceInfo->State.TransactionID++;\r
 \r
        Pipe_SelectPipe(SIInterfaceInfo->Config.DataOUTPipeNumber);\r
        Pipe_Unfreeze();\r