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Chapter 6
6
F6-4(2)
The USBD_DrvEP_TxStart() API starts the transmit process.
On DMA-based controllers, this device driver API is responsible for queuing the
DMA transmit descriptor and enabling DMA transmit complete ISR’s.
On FIFO-based controllers, this device driver API is responsible for enabling
transmit complete ISR’s.
The call to USBD_EP_Tx() returns immediately to the application (without
blocking) while data is being transmitted.
F6-4(3)
The USB device controller triggers an interrupt request when it is finished
transmitting the data. This invokes the USB device driver interrupt service
routine (ISR) handler, directly or indirectly, depending on the architecture.
F6-4(4)
Inside the USB device driver ISR handler, the type of interrupt request is
determined as a transmit interrupt. USBD_EP_TxCmpl() is called to queue the
endpoint that had its transfer completed.
On DMA-based controllers, the transmit transfer is de-queued from the list of
completed transfers.
F6-4(5)
The core task de-queues the endpoint that completed a transfer.
F6-4(6)
If the overall amount of data transmitted is less than the amount requested,
USBD_DrvEP_Tx() and USBD_DrvEP_TxStart() are called to transmit the
remaining amount of data.
F6-4(7)
The device transmit operation finishes when the amount of data transmitted
matches the amount requested. The transmit complete callback is invoked to
notify the application about the completion of the process.
96
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