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Class Instance Communication
■
Call USBD_PHDC_Rd() a number of times corresponding to the number of incoming
transfers returned by USBD_PHDC_RdPreamble() . Application must ensure that the
buffer provided to the function is large enough to accommodate all the data. Otherwise,
synchronization issues might happen. Note that if the host enables preamble while the
application is pending on that function, it will immediately return with error
“ USBD_ERR_OS_ABORT ”.
11
CPU_INT16U
{
App_USBD_PHDC_Rd(CPU_INT08U
CPU_INT08U
CPU_INT08U
CPU_INT08U
USBD_ERR
class_nbr,
*p_data_opaque_buf
*p_data_opaque_len,
*p_buf,
*p_err)
CPU_INT08U
CPU_INT16U
nbr_xfer;
xfer_len;
*p_data_opaque_len = USBD_PHDC_RdPreamble( class_nbr,
(void *)p_data_opaque_buf,
USBD_PHDC_CFG_DATA_OPAQUE_MAX_LEN,
&nbr_xfer,
0,
p_err);
for (i = 0; i < nbr_xfers; i++) {
xfer_len = USBD_PHDC_Rd( class_nbr,
(void *)p_buf,
APP_USBD_PHDC_ITEM_DATA_LEN_MAX,
0,
(1)
(2)
(3)
(4)
(5)
(6)
(4)
p_err);
/* Handle received data. */
}
return (xfer_len);
}
Listing 11-2 PHDC Read Procedure
L11-2(1)
The class instance number obtained with USBD_PHDC_Add() will serve
internally to the PHDC class to route the data to the proper endpoints.
193
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