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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** CDC ACM Class */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_host_class_cdc_acm.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_cdc_acm_endpoints_get PORTABLE C */
/* 6.3.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function distinguishes for either the Data or Control Class. */
/* For the data class, we mount the bulk in and bulk out endpoints. */
/* For the control class, we mount the optional interrupt endpoint. */
/* */
/* INPUT */
/* */
/* cdc_acm Pointer to cdc_acm class */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_stack_interface_endpoint_get Get interface endpoint */
/* */
/* CALLED BY */
/* */
/* _ux_host_class_cdc_acm_activate Activate cdc_acm class */
/* */
/**************************************************************************/
UINT _ux_host_class_cdc_acm_endpoints_get(UX_HOST_CLASS_CDC_ACM *cdc_acm)
{
UINT status;
UINT endpoint_index;
UX_ENDPOINT *endpoint;
UX_TRANSFER *transfer_request;
/* Check what interface we are mounting. */
if (cdc_acm -> ux_host_class_cdc_acm_interface -> ux_interface_descriptor.bInterfaceClass == UX_HOST_CLASS_CDC_DATA_CLASS)
{
/* Search the bulk OUT endpoint. It is attached to the interface container. */
for (endpoint_index = 0; endpoint_index < cdc_acm -> ux_host_class_cdc_acm_interface -> ux_interface_descriptor.bNumEndpoints;
endpoint_index++)
{
/* Get interface endpoint. */
status = _ux_host_stack_interface_endpoint_get(cdc_acm -> ux_host_class_cdc_acm_interface, endpoint_index, &endpoint);
/* Check status. */
if (status != UX_SUCCESS)
continue;
/* Check if endpoint is bulk and OUT. */
if (((endpoint -> ux_endpoint_descriptor.bEndpointAddress & UX_ENDPOINT_DIRECTION) == UX_ENDPOINT_OUT) &&
((endpoint -> ux_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE) == UX_BULK_ENDPOINT))
{
/* This transfer_request always have the OUT direction. */
endpoint -> ux_endpoint_transfer_request.ux_transfer_request_type = UX_REQUEST_OUT;
/* Set default timeout for transfer. */
endpoint -> ux_endpoint_transfer_request.ux_transfer_request_timeout_value = UX_HOST_CLASS_CDC_ACM_CLASS_TRANSFER_TIMEOUT;
/* We have found the bulk endpoint, save it. */
cdc_acm -> ux_host_class_cdc_acm_bulk_out_endpoint = endpoint;
/* If found all, we break. */
if (cdc_acm -> ux_host_class_cdc_acm_bulk_in_endpoint)
break;
}
/* Check if endpoint is bulk and IN. */
if (((endpoint -> ux_endpoint_descriptor.bEndpointAddress & UX_ENDPOINT_DIRECTION) == UX_ENDPOINT_IN) &&
((endpoint -> ux_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE) == UX_BULK_ENDPOINT))
{
/* This transfer_request always have the IN direction. */
endpoint -> ux_endpoint_transfer_request.ux_transfer_request_type = UX_REQUEST_IN;
/* Set default timeout for transfer. */
endpoint -> ux_endpoint_transfer_request.ux_transfer_request_timeout_value = UX_HOST_CLASS_CDC_ACM_CLASS_TRANSFER_TIMEOUT;
/* We have found the bulk endpoint, save it. */
cdc_acm -> ux_host_class_cdc_acm_bulk_in_endpoint = endpoint;
/* If found all, we break. */
if (cdc_acm -> ux_host_class_cdc_acm_bulk_out_endpoint)
break;
}
}
/* The both bulk endpoints are mandatory. */
if (cdc_acm -> ux_host_class_cdc_acm_bulk_out_endpoint == UX_NULL ||
cdc_acm -> ux_host_class_cdc_acm_bulk_in_endpoint == UX_NULL)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_ENDPOINT_HANDLE_UNKNOWN);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_ENDPOINT_HANDLE_UNKNOWN, cdc_acm, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_ENDPOINT_HANDLE_UNKNOWN);
}
}
else
{
/* Search the Interrupt endpoint. It is attached to the interface container of the control interface. It is not mandatory. */
for (endpoint_index = 0; endpoint_index < cdc_acm -> ux_host_class_cdc_acm_interface -> ux_interface_descriptor.bNumEndpoints;
endpoint_index++)
{
/* Get the endpoint handle. */
status = _ux_host_stack_interface_endpoint_get(cdc_acm -> ux_host_class_cdc_acm_interface, endpoint_index, &endpoint);
/* Check status. */
if (status != UX_SUCCESS)
continue;
/* Check if endpoint is Interrupt and IN. */
if (((endpoint -> ux_endpoint_descriptor.bEndpointAddress & UX_ENDPOINT_DIRECTION) == UX_ENDPOINT_IN) &&
((endpoint -> ux_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE) == UX_INTERRUPT_ENDPOINT))
{
/* This transfer_request always have the IN direction. */
endpoint -> ux_endpoint_transfer_request.ux_transfer_request_type = UX_REQUEST_IN;
/* We have found the interrupt endpoint, save it. */
cdc_acm -> ux_host_class_cdc_acm_interrupt_endpoint = endpoint;
/* The endpoint is correct, Fill in the transfer request with the length requested for this endpoint. */
transfer_request = &cdc_acm -> ux_host_class_cdc_acm_interrupt_endpoint -> ux_endpoint_transfer_request;
transfer_request -> ux_transfer_request_requested_length = transfer_request -> ux_transfer_request_packet_length;
transfer_request -> ux_transfer_request_actual_length = 0;
/* The direction is always IN for the CDC interrupt endpoint. */
transfer_request -> ux_transfer_request_type = UX_REQUEST_IN;
/* There is a callback function associated with the transfer request, so we need the class instance. */
transfer_request -> ux_transfer_request_class_instance = (VOID *) cdc_acm;
/* Interrupt transactions have a completion routine. */
transfer_request -> ux_transfer_request_completion_function = _ux_host_class_cdc_acm_transfer_request_completed;
/* Obtain a buffer for this transaction. The buffer will always be reused. */
transfer_request -> ux_transfer_request_data_pointer = _ux_utility_memory_allocate(UX_SAFE_ALIGN, UX_CACHE_SAFE_MEMORY,
transfer_request -> ux_transfer_request_requested_length);
/* If the endpoint is available and we have memory, we start the interrupt endpoint. */
if (transfer_request -> ux_transfer_request_data_pointer != UX_NULL)
{
/* The transfer on the interrupt endpoint can be started. */
status = _ux_host_stack_transfer_request(transfer_request);
/* Check error, if endpoint interrupt IN transfer not successful, do not proceed. */
if (status != UX_SUCCESS)
/* Error, do not proceed. */
return(status);
}
else
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_MEMORY_INSUFFICIENT);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_MEMORY_INSUFFICIENT, cdc_acm, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* We must return an error. */
return(UX_ENDPOINT_HANDLE_UNKNOWN);
}
break;
}
}
}
/* All endpoints have been mounted. */
return(UX_SUCCESS);
}
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