experimental speed-up of cdc Tx

TinyFrame/TF_Integration.c

@@ -4,6 +4,7 @@
 // TinyFrame integration
 //
 
+#include <USB/usb_device.h>
 #include "platform.h"
 #include "task_main.h"
 
@@ -26,7 +27,12 @@ void TF_WriteImpl(TinyFrame *tf, const uint8_t *buff, uint32_t len)
         }
 
         const uint16_t chunksize = (uint16_t) MIN(total, CHUNK);
-        assert_param(USBD_OK == CDC_Transmit_FS((uint8_t *) buff, chunksize));
+
+        // this is an attempt to speed it up a little by removing a couple levels of indirection
+        assert_param(HAL_OK == HAL_PCD_EP_Transmit(hUsbDeviceFS.pData, CDC_IN_EP, (uint8_t *) buff, chunksize));
+
+//        USBD_LL_Transmit(&hUsbDeviceFS, CDC_IN_EP, (uint8_t *) buff, chunksize);
+//        assert_param(USBD_OK == CDC_Transmit_FS((uint8_t *) buff, chunksize));
 
         buff += chunksize;
         total -= chunksize;