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common/usbx_stm32_host_controllers/ux_hcd_stm32_endpoint_destroy.c
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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 */
/** */
/** STM32 Controller Driver */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#define UX_HCD_STM32_SOURCE_CODE
#include "ux_api.h"
#include "ux_hcd_stm32.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_hcd_stm32_endpoint_destroy PORTABLE C */
/* 6.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function will destroy an endpoint. */
/* */
/* INPUT */
/* */
/* hcd_stm32 Pointer to STM32 controller */
/* endpoint Pointer to endpoint */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_utility_virtual_address Get virtual address */
/* _ux_utility_delay_ms Delay ms */
/* */
/* CALLED BY */
/* */
/* STM32 Controller Driver */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* */
/**************************************************************************/
UINT _ux_hcd_stm32_endpoint_destroy(UX_HCD_STM32 *hcd_stm32, UX_ENDPOINT *endpoint)
{
UX_HCD_STM32_ED *ed;
UX_HCD_STM32_ED *next_ed;
UINT endpoint_type;
/* From the endpoint container fetch the STM32 ED descriptor. */
ed = (UX_HCD_STM32_ED *) endpoint -> ux_endpoint_ed;
/* Check if this physical endpoint has been initialized properly! */
if (ed == UX_NULL)
{
/* Error trap. */
_ux_system_error_handler(UX_SYSTEM_LEVEL_THREAD, UX_SYSTEM_CONTEXT_HCD, 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, endpoint, 0, 0, UX_TRACE_ERRORS, 0, 0)
return(UX_ENDPOINT_HANDLE_UNKNOWN);
}
/* Wait for the controller to finish the current frame processing. */
_ux_utility_delay_ms(1);
/* We need to free the channel. */
hcd_stm32 -> ux_hcd_stm32_channels_ed[ed -> ux_stm32_ed_channel] = UX_NULL;
/* Get endpoint type. */
endpoint_type = (endpoint -> ux_endpoint_descriptor.bmAttributes) & UX_MASK_ENDPOINT_TYPE;
/* Check for periodic endpoints. */
if ((endpoint_type == UX_INTERRUPT_ENDPOINT) || (endpoint_type == UX_ISOCHRONOUS_ENDPOINT))
{
/* Remove the ED from periodic ED list. */
if (hcd_stm32 -> ux_hcd_stm32_periodic_ed_head == ed)
{
/* The only one in the list, just set the pointer to null. */
hcd_stm32 -> ux_hcd_stm32_periodic_ed_head = UX_NULL;
}
else
{
/* Get the first ED in the list. */
next_ed = hcd_stm32 -> ux_hcd_stm32_periodic_ed_head;
/* Search for the ED in the list. */
while( (next_ed != UX_NULL) && (next_ed -> ux_stm32_ed_next_ed != ed) )
{
/* Move to next ED. */
next_ed = next_ed -> ux_stm32_ed_next_ed;
}
/* Check if we found the ED. */
if (next_ed)
{
/* Remove the ED from list. */
next_ed -> ux_stm32_ed_next_ed = next_ed -> ux_stm32_ed_next_ed -> ux_stm32_ed_next_ed;
}
}
/* Decrease the periodic active count. */
hcd_stm32 -> ux_hcd_stm32_periodic_scheduler_active --;
}
/* Now we can safely make the ED free. */
ed -> ux_stm32_ed_status = UX_HCD_STM32_ED_STATUS_FREE;
/* Return successful completion. */
return(UX_SUCCESS);
}