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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** USBX Component */
/** */
/** Acm Cdc 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"
#if defined(UX_HOST_STANDALONE)
#define UX_HOST_CLASS_CDC_ACM_INIT_TRANSFER_WAIT (UX_STATE_WAIT)
#define UX_HOST_CLASS_CDC_ACM_INIT_DESCRIPTORS_PARSE (UX_STATE_NEXT)
#define UX_HOST_CLASS_CDC_ACM_INIT_DELAY_WAIT (UX_STATE_CLASS_STEP + 0)
#define UX_HOST_CLASS_CDC_ACM_INIT_LINE_CODING_SET (UX_STATE_CLASS_STEP + 1)
#define UX_HOST_CLASS_CDC_ACM_INIT_LINE_CODING_GET (UX_STATE_CLASS_STEP + 2)
#define UX_HOST_CLASS_CDC_ACM_INIT_LINE_CODING_CHECK (UX_STATE_CLASS_STEP + 3)
#define UX_HOST_CLASS_CDC_ACM_INIT_LINE_STATE_SET (UX_STATE_CLASS_STEP + 4)
#define UX_HOST_CLASS_CDC_ACM_INIT_ERROR (UX_STATE_CLASS_STEP + 5)
#define UX_HOST_CLASS_CDC_ACM_INIT_DONE (UX_STATE_CLASS_STEP + 6)
static inline UINT _ux_host_class_cdc_acm_activate_wait(UX_HOST_CLASS_COMMAND *command);
#endif
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_host_class_cdc_acm_entry PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is the entry point of the cdc_acm class. It will be */
/* called by the USBX stack enumeration module when there is a new */
/* cdc_acm on the bus or when the USB cdc_acm is removed. */
/* */
/* A CDC class can have multiple interfaces, one for Control and one */
/* for Data. Here we filter for the Communication Class with ACM */
/* subclass and the Communication Data Class. */
/* */
/* */
/* INPUT */
/* */
/* command Acm Cdc class command */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_host_class_cdc_acm_activate Activate cdc_acm class */
/* _ux_host_class_cdc_acm_deactivate Deactivate cdc_acm class */
/* */
/* CALLED BY */
/* */
/* Acm Cdc Class */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* 09-30-2020 Chaoqiong Xiao Modified comment(s), */
/* resulting in version 6.1 */
/* 01-31-2022 Chaoqiong Xiao Modified comment(s), */
/* added standalone support, */
/* resulting in version 6.1.10 */
/* */
/**************************************************************************/
UINT _ux_host_class_cdc_acm_entry(UX_HOST_CLASS_COMMAND *command)
{
UINT status;
/* The command request will tell us we need to do here, either a enumeration
query, an activation or a deactivation. */
switch (command -> ux_host_class_command_request)
{
case UX_HOST_CLASS_COMMAND_QUERY:
/* The query command is used to let the stack enumeration process know if we want to own
this device or not. */
if((command -> ux_host_class_command_usage == UX_HOST_CLASS_COMMAND_USAGE_CSP) &&
((command -> ux_host_class_command_class == UX_HOST_CLASS_CDC_DATA_CLASS) ||
((command -> ux_host_class_command_class == UX_HOST_CLASS_CDC_CONTROL_CLASS) &&
(command -> ux_host_class_command_subclass == UX_HOST_CLASS_CDC_ACM_SUBCLASS)) ||
((command -> ux_host_class_command_class == UX_HOST_CLASS_CDC_CONTROL_CLASS) &&
(command -> ux_host_class_command_subclass == UX_HOST_CLASS_CDC_DLC_SUBCLASS))))
{
/* Check for IAD presence. */
if ((command -> ux_host_class_command_iad_class == 0) && (command -> ux_host_class_command_iad_subclass == 0))
/* No IAD, we accept this class. */
return(UX_SUCCESS);
else
{
if ((command -> ux_host_class_command_iad_class == UX_HOST_CLASS_CDC_CONTROL_CLASS) &&
(command -> ux_host_class_command_iad_subclass == UX_HOST_CLASS_CDC_ACM_SUBCLASS))
/* There is an IAD and this is for CDC-ACM. */
return(UX_SUCCESS);
else
/* The IAD does not match with CDC-ACM. */
return(UX_NO_CLASS_MATCH);
}
}
else
/* No match. */
return(UX_NO_CLASS_MATCH);
case UX_HOST_CLASS_COMMAND_ACTIVATE:
/* The activate command is used when the device inserted has found a parent and
is ready to complete the enumeration. */
status = _ux_host_class_cdc_acm_activate(command);
return(status);
#if defined(UX_HOST_STANDALONE)
case UX_HOST_CLASS_COMMAND_ACTIVATE_WAIT:
status = _ux_host_class_cdc_acm_activate_wait(command);
return(status);
#endif
case UX_HOST_CLASS_COMMAND_DEACTIVATE:
/* The deactivate command is used when the device has been extracted either
directly or when its parents has been extracted. */
status = _ux_host_class_cdc_acm_deactivate(command);
return(status);
default:
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_FUNCTION_NOT_SUPPORTED);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_FUNCTION_NOT_SUPPORTED, 0, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_FUNCTION_NOT_SUPPORTED);
}
}
#if defined(UX_HOST_STANDALONE)
static inline VOID _ux_host_class_cdc_acm_descriptors_parse(UX_HOST_CLASS_CDC_ACM *cdc_acm)
{
UX_ENDPOINT *control_endpoint;
UX_TRANSFER *transfer_request;
UX_INTERFACE *interface;
UCHAR *descriptor;
ULONG total_descriptor_length;
UCHAR descriptor_length;
UCHAR descriptor_type;
UCHAR descriptor_byte2;
ULONG interface_found;
ULONG interface_parsed;
UCHAR offset;
/* We need to get the default control endpoint transfer request pointer. */
control_endpoint = &cdc_acm -> ux_host_class_cdc_acm_device -> ux_device_control_endpoint;
transfer_request = &control_endpoint -> ux_endpoint_transfer_request;
/* Check if transfer is done success. */
if (transfer_request -> ux_transfer_request_completion_code != UX_SUCCESS ||
transfer_request -> ux_transfer_request_actual_length !=
transfer_request -> ux_transfer_request_requested_length)
{
cdc_acm -> ux_host_class_cdc_acm_status = UX_DESCRIPTOR_CORRUPTED;
cdc_acm -> ux_host_class_cdc_acm_cmd_state = UX_HOST_CLASS_CDC_ACM_INIT_ERROR;
return;
}
/* Get the interface. */
interface = cdc_acm -> ux_host_class_cdc_acm_interface;
/* Parse the descriptor. */
total_descriptor_length = transfer_request -> ux_transfer_request_actual_length;
descriptor = (UCHAR *)cdc_acm -> ux_host_class_cdc_acm_allocated;
interface_found = UX_FALSE;
interface_parsed = UX_FALSE;
while(total_descriptor_length)
{
/* Get descriptor length, type, subtype. */
descriptor_length = *descriptor;
descriptor_type = *(descriptor + 1);
descriptor_byte2 = *(descriptor + 2);
/* Make sure this descriptor has at least the minimum length. */
if (descriptor_length < 3 || descriptor_length > total_descriptor_length)
{
/* Descriptor is corrupted. */
break;
}
/* Process related descriptors. */
switch(descriptor_type)
{
case UX_INTERFACE_DESCRIPTOR_ITEM:
/* Check if interface is what we expected. */
if (interface -> ux_interface_descriptor.bInterfaceNumber == descriptor_byte2)
{
/* Mark found. */
interface_found = UX_TRUE;
}
else
{
/* Run out of expected interface. */
if (interface_found)
{
interface_parsed = UX_TRUE;
}
}
break;
case UX_HOST_CLASS_CDC_ACM_CS_INTERFACE:
/* Check if we are in correct interface. */
if (interface_found)
{
/* Check bDescriptorSubType. */
switch(descriptor_byte2)
{
case UX_HOST_CLASS_CDC_ACM_CALL_MANAGEMENT_DESCRIPTOR:
/* Store capabilities. */
cdc_acm -> ux_host_class_cdc_acm_capabilities =
*(descriptor + UX_HOST_CLASS_CDC_ACM_CALL_MANAGEMENT_CAPABILITIES);
break;
case UX_HOST_CLASS_CDC_ACM_UNION_DESCRIPTOR:
/* Check related interfaces. */
for (offset = UX_HOST_CLASS_CDC_ACM_UNION_FUNCTIONAL_MASTER;
offset < descriptor_length;
offset ++)
{
/* Save the interface in interface bitmap. */
cdc_acm -> ux_host_class_cdc_acm_interfaces_bitmap |=
1u << *(descriptor + offset);
}
break;
default:
break;
}
}
break;
default:
break;
}
/* Next descriptor. */
descriptor += descriptor_length;
total_descriptor_length -= descriptor_length;
}
/* We can free the resource now. */
_ux_utility_memory_free(cdc_acm -> ux_host_class_cdc_acm_allocated);
cdc_acm -> ux_host_class_cdc_acm_allocated = UX_NULL;
/* Descriptor fail. */
if (interface_parsed == UX_FALSE)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_CLASS, UX_DESCRIPTOR_CORRUPTED);
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_ERROR, UX_DESCRIPTOR_CORRUPTED, descriptor, 0, 0, UX_TRACE_ERRORS, 0, 0)
/* Descriptor is corrupted. */
cdc_acm -> ux_host_class_cdc_acm_status = UX_DESCRIPTOR_CORRUPTED;
cdc_acm -> ux_host_class_cdc_acm_cmd_state = UX_HOST_CLASS_CDC_ACM_INIT_ERROR;
return;
}
/* Descriptor is parsed. */
cdc_acm -> ux_host_class_cdc_acm_tick = _ux_utility_time_get();
cdc_acm -> ux_host_class_cdc_acm_cmd_state = UX_HOST_CLASS_CDC_ACM_INIT_DELAY_WAIT;
}
static inline UINT _ux_host_class_cdc_acm_activate_wait(UX_HOST_CLASS_COMMAND *command)
{
UX_HOST_CLASS *cdc_acm_class;
UX_HOST_CLASS_CDC_ACM *cdc_acm_inst;
UX_INTERFACE *interface;
UX_HOST_CLASS_CDC_ACM *cdc_acm;
UX_ENDPOINT *control_endpoint;
UX_TRANSFER *transfer;
UCHAR *buffer;
ULONG rate, stop_bit, parity, data_bit;
UINT status;
ULONG tick, diff;
/* Get the instance for this class. */
interface = (UX_INTERFACE *)command -> ux_host_class_command_container;
cdc_acm = (UX_HOST_CLASS_CDC_ACM *) interface -> ux_interface_class_instance;
/* Run initialize state machine. */
switch(cdc_acm -> ux_host_class_cdc_acm_cmd_state)
{
case UX_HOST_CLASS_CDC_ACM_INIT_DESCRIPTORS_PARSE:
_ux_host_class_cdc_acm_descriptors_parse(cdc_acm);
break;
case UX_HOST_CLASS_CDC_ACM_INIT_DELAY_WAIT:
tick = _ux_utility_time_get();
diff = _ux_utility_time_elapsed(cdc_acm -> ux_host_class_cdc_acm_tick, tick);
if (diff > UX_MS_TO_TICK(UX_HOST_CLASS_CDC_ACM_DEVICE_INIT_DELAY))
{
/* Allocate some buffer for commands. */
cdc_acm -> ux_host_class_cdc_acm_allocated =
_ux_utility_memory_allocate(UX_SAFE_ALIGN, UX_CACHE_SAFE_MEMORY,
8);
if (cdc_acm -> ux_host_class_cdc_acm_allocated == UX_NULL)
{
cdc_acm -> ux_host_class_cdc_acm_status = UX_MEMORY_INSUFFICIENT;
cdc_acm -> ux_host_class_cdc_acm_cmd_state =
UX_HOST_CLASS_CDC_ACM_INIT_ERROR;
break;
}
control_endpoint = &cdc_acm -> ux_host_class_cdc_acm_device ->
ux_device_control_endpoint;
transfer = &control_endpoint -> ux_endpoint_transfer_request;
/* Initialize transfer buffer. */
transfer -> ux_transfer_request_data_pointer = (UCHAR *)
cdc_acm -> ux_host_class_cdc_acm_allocated;
/* Initialize transfer flags. */
transfer -> ux_transfer_request_flags = 0;
cdc_acm -> ux_host_class_cdc_acm_cmd_state =
UX_HOST_CLASS_CDC_ACM_INIT_LINE_CODING_SET;
}
break;
case UX_HOST_CLASS_CDC_ACM_INIT_LINE_CODING_SET:
/* Put line coding things in buffer. */
buffer = (UCHAR *)cdc_acm -> ux_host_class_cdc_acm_allocated;
rate = UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_RATE;
stop_bit = UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_STOP_BIT;
parity = UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_PARITY;
data_bit = UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_DATA_BIT;
_ux_utility_long_put(buffer + UX_HOST_CLASS_CDC_ACM_LINE_CODING_RATE, rate);
*(buffer + UX_HOST_CLASS_CDC_ACM_LINE_CODING_STOP_BIT) = (UCHAR)stop_bit;
*(buffer + UX_HOST_CLASS_CDC_ACM_LINE_CODING_PARITY) = (UCHAR)parity;
*(buffer + UX_HOST_CLASS_CDC_ACM_LINE_CODING_DATA_BIT) = (UCHAR)data_bit;
status = _ux_host_class_cdc_acm_command(cdc_acm,
UX_HOST_CLASS_CDC_ACM_REQ_SET_LINE_CODING, 0,
buffer, UX_HOST_CLASS_CDC_ACM_LINE_CODING_LENGTH);
if (status != UX_SUCCESS)
{
cdc_acm -> ux_host_class_cdc_acm_status = status;
cdc_acm -> ux_host_class_cdc_acm_cmd_state =
UX_HOST_CLASS_CDC_ACM_INIT_ERROR;
break;
}
cdc_acm -> ux_host_class_cdc_acm_cmd_state =
UX_HOST_CLASS_CDC_ACM_INIT_TRANSFER_WAIT;
cdc_acm -> ux_host_class_cdc_acm_next_state =
UX_HOST_CLASS_CDC_ACM_INIT_LINE_CODING_GET;
break;
case UX_HOST_CLASS_CDC_ACM_INIT_LINE_CODING_GET:
/* Get line coding things from device. */
buffer = (UCHAR *)cdc_acm -> ux_host_class_cdc_acm_allocated;
status = _ux_host_class_cdc_acm_command(cdc_acm,
UX_HOST_CLASS_CDC_ACM_REQ_GET_LINE_CODING, 0,
buffer, UX_HOST_CLASS_CDC_ACM_LINE_CODING_LENGTH);
if (status != UX_SUCCESS)
{
cdc_acm -> ux_host_class_cdc_acm_status = status;
cdc_acm -> ux_host_class_cdc_acm_cmd_state =
UX_HOST_CLASS_CDC_ACM_INIT_ERROR;
break;
}
cdc_acm -> ux_host_class_cdc_acm_cmd_state =
UX_HOST_CLASS_CDC_ACM_INIT_TRANSFER_WAIT;
cdc_acm -> ux_host_class_cdc_acm_next_state =
UX_HOST_CLASS_CDC_ACM_INIT_LINE_CODING_CHECK;
break;
case UX_HOST_CLASS_CDC_ACM_INIT_LINE_CODING_CHECK:
/* Check line coding things in buffer. */
buffer = (UCHAR *)cdc_acm -> ux_host_class_cdc_acm_allocated;
rate = _ux_utility_long_get(buffer + UX_HOST_CLASS_CDC_ACM_LINE_CODING_RATE);
stop_bit = *(buffer + UX_HOST_CLASS_CDC_ACM_LINE_CODING_STOP_BIT);
parity = *(buffer + UX_HOST_CLASS_CDC_ACM_LINE_CODING_PARITY);
data_bit = *(buffer + UX_HOST_CLASS_CDC_ACM_LINE_CODING_DATA_BIT);
if (rate != UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_RATE ||
stop_bit != UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_STOP_BIT ||
parity != UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_PARITY ||
data_bit != UX_HOST_CLASS_CDC_ACM_LINE_CODING_DEFAULT_DATA_BIT)
{
cdc_acm -> ux_host_class_cdc_acm_status = UX_DEVICE_ENUMERATION_FAILURE;
cdc_acm -> ux_host_class_cdc_acm_cmd_state = UX_HOST_CLASS_CDC_ACM_INIT_ERROR;
break;
}
/* Fall through. */
case UX_HOST_CLASS_CDC_ACM_INIT_LINE_STATE_SET:
/* Put line state things. */
buffer = (UCHAR *)cdc_acm -> ux_host_class_cdc_acm_allocated;
*(buffer) = UX_HOST_CLASS_CDC_ACM_CTRL_DTR | UX_HOST_CLASS_CDC_ACM_CTRL_RTS;
status = _ux_host_class_cdc_acm_command(cdc_acm,
UX_HOST_CLASS_CDC_ACM_REQ_SET_LINE_STATE,
*(buffer), UX_NULL, 0);
if (status != UX_SUCCESS)
{
cdc_acm -> ux_host_class_cdc_acm_status = status;
cdc_acm -> ux_host_class_cdc_acm_cmd_state =
UX_HOST_CLASS_CDC_ACM_INIT_ERROR;
break;
}
cdc_acm -> ux_host_class_cdc_acm_cmd_state =
UX_HOST_CLASS_CDC_ACM_INIT_TRANSFER_WAIT;
cdc_acm -> ux_host_class_cdc_acm_next_state =
UX_HOST_CLASS_CDC_ACM_INIT_DONE;
break;
case UX_HOST_CLASS_CDC_ACM_INIT_ERROR:
/* Fall through. */
case UX_HOST_CLASS_CDC_ACM_INIT_DONE:
/* Free allocated buffer. */
if (cdc_acm -> ux_host_class_cdc_acm_allocated)
{
_ux_utility_memory_free(cdc_acm -> ux_host_class_cdc_acm_allocated);
cdc_acm -> ux_host_class_cdc_acm_allocated = UX_NULL;
}
/* Check status. */
if (cdc_acm -> ux_host_class_cdc_acm_status == UX_SUCCESS)
{
/* We scan CDC ACM instances to find the DATA instance. */
/* Get class. */
cdc_acm_class = cdc_acm -> ux_host_class_cdc_acm_class;
/* Get first instance linked to the class. */
cdc_acm_inst = (UX_HOST_CLASS_CDC_ACM *)cdc_acm_class -> ux_host_class_first_instance;
/* Scan all instances. */
while(cdc_acm_inst)
{
/* Get interface of the instance. */
interface = cdc_acm_inst -> ux_host_class_cdc_acm_interface;
/* If this data interface is inside the associate list, link it. */
if (cdc_acm -> ux_host_class_cdc_acm_interfaces_bitmap &
(1ul << interface -> ux_interface_descriptor.bInterfaceNumber))
{
/* Save control instance and we are done. */
cdc_acm_inst -> ux_host_class_cdc_acm_control = cdc_acm;
break;
}
/* Next instance. */
cdc_acm_inst = cdc_acm_inst -> ux_host_class_cdc_acm_next_instance;
}
/* Mark the cdc_acm as live now. Both interfaces need to be live. */
cdc_acm -> ux_host_class_cdc_acm_state = UX_HOST_CLASS_INSTANCE_LIVE;
/* If all is fine and the device is mounted, we may need to inform the application
if a function has been programmed in the system structure. */
if (_ux_system_host -> ux_system_host_change_function != UX_NULL)
{
/* Call system change function. */
_ux_system_host -> ux_system_host_change_function(UX_DEVICE_INSERTION, cdc_acm -> ux_host_class_cdc_acm_class, (VOID *) cdc_acm);
}
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_HOST_CLASS_CDC_ACM_ACTIVATE, cdc_acm, 0, 0, 0, UX_TRACE_HOST_CLASS_EVENTS, 0, 0)
/* If trace is enabled, register this object. */
UX_TRACE_OBJECT_REGISTER(UX_TRACE_HOST_OBJECT_TYPE_INTERFACE, cdc_acm, 0, 0, 0)
/* Reset CMD state. */
cdc_acm -> ux_host_class_cdc_acm_cmd_state = UX_STATE_RESET;
}
else
{
/* On error case, it's possible data buffer allocated for interrupt endpoint and transfer started, stop and free it. */
if (cdc_acm -> ux_host_class_cdc_acm_interrupt_endpoint &&
cdc_acm -> ux_host_class_cdc_acm_interrupt_endpoint -> ux_endpoint_transfer_request.ux_transfer_request_data_pointer)
{
/* The first transfer request has already been initiated. Abort it. */
_ux_host_stack_endpoint_transfer_abort(cdc_acm -> ux_host_class_cdc_acm_interrupt_endpoint);
/* Free the memory for the data pointer. */
_ux_utility_memory_free(cdc_acm -> ux_host_class_cdc_acm_interrupt_endpoint -> ux_endpoint_transfer_request.ux_transfer_request_data_pointer);
}
/* Destroy the instance. */
_ux_host_stack_class_instance_destroy(cdc_acm -> ux_host_class_cdc_acm_class, (VOID *) cdc_acm);
/* Unmount instance. */
interface = cdc_acm -> ux_host_class_cdc_acm_interface;
interface -> ux_interface_class_instance = UX_NULL;
/* Free instance. */
_ux_utility_memory_free(cdc_acm);
}
/* Done, OK to go on. */
return(UX_STATE_NEXT);
case UX_HOST_CLASS_CDC_ACM_INIT_TRANSFER_WAIT:
/* Get transfer. */
control_endpoint = &cdc_acm -> ux_host_class_cdc_acm_device -> ux_device_control_endpoint;
transfer = &control_endpoint -> ux_endpoint_transfer_request;
/* Transfer state machine. */
status = _ux_host_stack_transfer_run(transfer);
/* Is it done? */
if (status <= UX_STATE_NEXT)
{
/* Is there error? */
if (transfer -> ux_transfer_request_completion_code != UX_SUCCESS)
{
cdc_acm -> ux_host_class_cdc_acm_cmd_state = UX_STATE_EXIT;
break;
}
/* No error, next state. */
cdc_acm -> ux_host_class_cdc_acm_cmd_state =
cdc_acm -> ux_host_class_cdc_acm_next_state;
break;
}
/* Keep waiting. */
break;
/* UX_STATE_RESET, UX_STATE_EXIT, UX_STATE_IDLE, ... */
default:
/* Do nothing. */
return(UX_STATE_NEXT);
}
/* Keep waiting. */
return(UX_STATE_WAIT);
}
#endif