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Configuration
{
(void)class_nbr;
(void)p_buf;
(void)buf_len;
(void)xfer_len;
(void)p_callback_arg;
(4)
9
if (err == USBD_ERR_NONE) {
/* $$$$ Do some processing. */
} else {
/* $$$$ Handle the error. */
}
}
(3)
static
void
App_USBD_HID_TxCmpl (CPU_INT08U
void
CPU_INT32U
CPU_INT32U
void
USBD_ERR
class_nbr,
*p_buf,
buf_len,
xfer_len,
*p_callback_arg,
err)
{
(void)class_nbr;
(void)p_buf;
(void)buf_len;
(void)xfer_len;
(void)p_callback_arg;
(4)
if (err == USBD_ERR_NONE) {
/* $$$$ Do some processing. */
} else {
/* $$$$ Handle the error. */
}
}
Listing 9-4 Asynchronous Bulk Read and Write Example
L9-4(1)
The class instance number serves internally for the HID class to route the
transfer to the proper interrupt OUT or IN endpoint.
L9-4(2)
The application must ensure that the buffer provided to the function is large
enough to accommodate all the data. Otherwise, synchronization issues might
happen. Internally, the read operation is done either with the control endpoint
or with the interrupt endpoint depending on the control read flag set when
calling USBD_HID_Add() .
153
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