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Configuration
CPU_INT08U
CPU_INT08U
USBD_ERR
rx_buf[2];
tx_buf[2];
err;
(void)USBD_HID_Rd( class_nbr,
(void *)&rx_buf[0],
2u,
0u,
&err);
if (err != USBD_ERR_NONE) {
/* $$$$ Handle the error. */
}
(void)USBD_HID_Wr( class_nbr,
(void *)&tx_buf[0],
2u,
0u,
(1)
(2)
(3)
(1)
(4)
(3)
9
&err);
if (err != USBD_ERR_NONE) {
/* $$$$ Handle the error. */
}
Listing 9-3 Synchronous Bulk Read and Write Example
L9-3(1)
The class instance number created from USBD_HID_Add() will serve internally
for the HID class to route the transfer to the proper interrupt OUT or IN
endpoint.
L9-3(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() .
L9-3(3)
In order to avoid an infinite blocking situation, a timeout expressed in
milliseconds can be specified. A value of ‘0’ makes the application task wait
forever.
L9-3(4)
The application provides the initialized transmit buffer.
151
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