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12-2-4 SYNCHRONOUS COMMUNICATION
Synchronous communication means that the transfer is blocking. Upon function call, the
applications blocks until the transfer completion with or without an error. A timeout can be
specified to avoid waiting forever.
Listing 12-2 presents a read and write example to receive data from the host using the bulk
OUT endpoint and to send data to the host using the bulk IN endpoint.
12
CPU_INT08U
CPU_INT08U
USBD_ERR
rx_buf[2];
tx_buf[2];
err;
(void)USBD_Vendor_Rd( class_nbr,
(void *)&rx_buf[0],
2u,
0u,
&err);
if (err != USBD_ERR_NONE) {
/* $$$$ Handle the error. */
}
(void)USBD_Vendor_Wr( class_nbr,
(void *)&tx_buf[0],
2u,
0u,
DEF_FALSE,
(1)
(2)
(3)
(1)
(4)
(3)
(5)
&err);
if (err != USBD_ERR_NONE) {
/* $$$$ Handle the error. */
}
Listing 12-2 Synchronous Bulk Read and Write Example
L12-2(1)
The class instance number created with USBD_Vendor_Add() will serve internally
to the Vendor class to route the transfer to the proper bulk OUT or IN endpoint.
L12-2(2)
Application must ensure that the buffer provided to the function is large enough
to accommodate all the data. Otherwise, synchronization issues might happen.
L12-2(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.
211
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