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Chapter 12
L12-2(4)
Application provides the initialized transmit buffer.
L12-2(5)
If this flag is set to DEF_TRUE and the transfer length is multiple of the endpoint
maximum packet size, the device stack will send a zero-length packet to the
host to signal the end of transfer.
The use of interrupt endpoint communication functions, USBD_Vendor_IntrRd() and
USBD_Vendor_IntrWr() , is similar to bulk endpoint communication functions presented in
12
Listing 12-2.
12-2-5 ASYNCHRONOUS COMMUNICATION
Asynchronous communication means that the transfer is non-blocking. Upon function call,
the application passes the transfer information to the device stack and does not block.
Other application processing can be done while the transfer is in progress over the USB
bus. Once the transfer has completed, a callback is called by the device stack to inform the
application about the transfer completion. Listing 12-3 shows an example of asynchronous
read and write.
void App_USBD_Vendor_Comm (CPU_INT08U
{
CPU_INT08U rx_buf[2];
CPU_INT08U tx_buf[2];
USBD_ERR err;
class_nbr)
212
USBD_Vendor_RdAsync( class_nbr,
(void *)&rx_buf[0],
2u,
App_USBD_Vendor_RxCmpl,
(void *) 0u,
&err);
if (err != USBD_ERR_NONE) {
/* $$$$ Handle the error. */
}
USBD_Vendor_WrAsync( class_nbr,
(void *)&tx_buf[0],
2u,
App_USBD_Vendor_TxCmpl,
(void *) 0u,
DEF_FALSE,
&err);
(1)
(2)
(3)
(4)
(1)
(5)
(3)
(4)
(6)
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