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USBDev_API
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 USBDev_API to inform the
application about the transfer completion.
Code Listing 12-6 presents a read example. The asynchronous write is not offered by
USBDev_API.
12
UCHAR
DWORD
rx_buf[2];
err;
USBDev_PipeRdAsync(
bulk_in_handle,
&rx_buf[0],
2u,
(1)
(2)
App_PipeRdAsyncComplete,
(void *)0u,
(3)
(4)
&err);
if (err != ERROR_SUCCESS) {
/* $$$$ Handle the error. */
}
(3)
static
void
App_PipeRdAsyncComplete(void
DWORD
DWORD
void
DWORD
*p_buf,
buf_len,
xfer_len,
*p_callback_arg,
err)
{
(void)p_buf;
(void)buf_len;
(void)xfer_len;
(void)p_callback_arg;
(4)
if (err == ERROR_SUCCESS) {
/* $$$$ Process the received data. */
} else {
/* $$$$ Handle the error. */
}
}
Listing 12-6 USBDev_API Asynchronous Read Example
219
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