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Chapter 8
8-4-5 SUBCLASS INSTANCE COMMUNICATION
Micriμm’s ACM subclass offers the following functions to communicate with the host. For
8
more details about the functions’ parameters, refer to section C-2 “CDC ACM Subclass
Functions” on page 369.
Function name
USBD_ACM_SerialRx()
USBD_ACM_SerialTx()
Operation
Receives data from host through a bulk OUT endpoint. This function is blocking.
Sends data to host through a bulk IN endpoint. This function is blocking.
Table 8-8 CDC ACM Communication API Summary
USBD_ACM_SerialRx() and USBD_ACM_SerialTx() provide synchronous communication
which means that the transfer is blocking. Upon calling the function, the application blocks
until transfer completion with or without an error. A timeout can be specified to avoid
waiting forever. Listing 8-3 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.
CPU_INT08U
CPU_INT08U
USBD_ERR
rx_buf[2];
tx_buf[2];
err;
(void)USBD_ACM_SerialRx(subclass_nbr,
&rx_buf[0],
2u,
0u,
&err);
if (err != USBD_ERR_NONE) {
/* Handle the error. */
}
(void)USBD_ACM_SerialTx(subclass_nbr,
&tx_buf[0],
2u,
0u,
(1)
(2)
(3)
(1)
(4)
(3)
&err);
if (err != USBD_ERR_NONE) {
/* Handle the error. */
}
Listing 8-3 Serial Read and Write Example
128
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