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USB Device Driver Functional Model
6-8-3 DEVICE SYNCHRONOUS TRANSMIT
6
The device synchronous transmit operation is initiated by the calls: USBD_BulkTx() ,
USBD_CtrlTx() , and USBD_IntrTx() . Figure 6-3 shows an overview of the device
synchronous transmit operation.
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Figure 6-3 Device Synchronous Transmit Diagram
F6-3(1)
The upper layer API’s, USBD_BulkTx() , USBD_CtrlTx() , and USBD_IntrTx() ,
call USBD_EP_Tx() , where USBD_DrvEP_Tx() is invoked.
On DMA-based controllers, this device driver API is responsible for preparing
the transmit transfer/descriptor and returning the amount of data to transmit. In
case the DMA-based controller requires the buffered data to be placed in a
dedicated USB memory region, the contents of the application buffer area must
be transferred into the dedicated memory region.
On FIFO-based controllers, this device driver API is responsible for writing the
amount of data to transfer into the FIFO and returning the amount of data to
transmit.
93
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