usbx
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Outline
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#define UX_SOURCE_CODE
#define UX_HCD_STM32_SOURCE_CODE
#include "ux_api.h"
#include "ux_hcd_stm32.h"
#include "ux_host_stack.h"
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_ux_hcd_stm32_ed_obtain(UX_HCD_STM32 *)
Files
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SourceVuSTM32 Libraries and Samplesusbxcommon/usbx_stm32_host_controllers/ux_hcd_stm32_ed_obtain.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_ed_obtain PORTABLE C */ /* 6.0 */ /* AUTHOR */ /* */ /* Chaoqiong Xiao, Microsoft Corporation */ /* */ /* DESCRIPTION */ /* */ /* This function obtains a free ED from the ED list. */ /* */ /* INPUT */ /* */ /* hcd_stm32 Pointer to STM32 controller */ /* */ /* OUTPUT */ /* */ /* UX_HCD_STM32_ED * Pointer to ED */ /* */ /* CALLS */ /* */ /* _ux_utility_memory_set Set memory block */ /* */ /* CALLED BY */ /* */ /* STM32 Controller Driver */ /* */ /* RELEASE HISTORY */ /* */ /* DATE NAME DESCRIPTION */ /* */ /* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */ /* */... /**************************************************************************/ UX_HCD_STM32_ED *_ux_hcd_stm32_ed_obtain(UX_HCD_STM32 *hcd_stm32) { UX_HCD_STM32_ED *ed; ULONG ed_index; /* Start the search from the beginning of the list. */ ed = hcd_stm32 -> ux_hcd_stm32_ed_list; for (ed_index = 0; ed_index < _ux_system_host -> ux_system_host_max_ed; ed_index++) { /* Check the ED status, a free ED is marked with the UNUSED flag. */ if (ed -> ux_stm32_ed_status == UX_HCD_STM32_ED_STATUS_FREE) { /* The ED may have been used, so we reset all fields. */ _ux_utility_memory_set(ed, 0, sizeof(UX_HCD_STM32_ED)); /* This ED is now marked as ALLOCATED. */ ed -> ux_stm32_ed_status = UX_HCD_STM32_ED_STATUS_ALLOCATED; /* Reset the channel. */ ed -> ux_stm32_ed_channel = UX_HCD_STM32_NO_CHANNEL_ASSIGNED; /* Return ED pointer. */ return(ed); }if (ed -> ux_stm32_ed_status == UX_HCD_STM32_ED_STATUS_FREE) { ... } /* Point to the next ED. */ ed++; }for (ed_index = 0; ed_index < _ux_system_host -> ux_system_host_max_ed; ed_index++) { ... } /* There is no available ED in the ED list. */ return(UX_NULL); }{ ... }
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