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Chapter 9
9-3-5 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.
9
Other application processing can be done while the transfer is in progress over the USB
bus. Once the transfer is completed, a callback is called by the device stack to inform the
application about the transfer completion.
Listing 9-4 shows an example of an asynchronous read and write.
void App_USBD_HID_Comm (CPU_INT08U
{
CPU_INT08U rx_buf[2];
CPU_INT08U tx_buf[2];
USBD_ERR err;
class_nbr)
USBD_HID_RdAsync( class_nbr,
(void *)&rx_buf[0],
2u,
App_USBD_HID_RxCmpl,
(void *) 0u,
&err);
if (err != USBD_ERR_NONE) {
/* Handle the error. */
}
USBD_HID_WrAsync( class_nbr,
(void *)&tx_buf[0],
2u,
App_USBD_HID_TxCmpl,
(void *) 0u,
(1)
(2)
(3)
(4)
(1)
(5)
(3)
(4)
&err);
if (err != USBD_ERR_NONE) {
/* $$$$ Handle the error. */
}
}
(3)
static
void
App_USBD_HID_RxCmpl (CPU_INT08U
void
CPU_INT32U
CPU_INT32U
void
USBD_ERR
class_nbr,
*p_buf,
buf_len,
xfer_len,
*p_callback_arg,
err)
152
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