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common/usbx_stm32_host_controllers/ux_hcd_stm32_request_bulk_transfer.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_request_bulk_transfer PORTABLE C */
/* 6.0 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function performs a bulk transfer request. A bulk transfer */
/* can be larger than the size of the stm32 buffer so it may be */
/* required to chain multiple tds to accommodate this transfer */
/* request. A bulk transfer is non blocking, so we return before the */
/* transfer request is completed. */
/* */
/* INPUT */
/* */
/* hcd_stm32 Pointer to STM32 controller */
/* transfer_request Pointer to transfer request */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _ux_hcd_stm32_regular_td_obtain Obtain regular TD */
/* */
/* CALLED BY */
/* */
/* STM32 Controller Driver */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 Chaoqiong Xiao Initial Version 6.0 */
/* */
/**************************************************************************/
UINT _ux_hcd_stm32_request_bulk_transfer(UX_HCD_STM32 *hcd_stm32, UX_TRANSFER *transfer_request)
{
UX_ENDPOINT *endpoint;
UX_HCD_STM32_ED *ed;
UINT direction;
UINT length;
/* Get the pointer to the Endpoint. */
endpoint = (UX_ENDPOINT *) transfer_request -> ux_transfer_request_endpoint;
/* Now get the physical ED attached to this endpoint. */
ed = endpoint -> ux_endpoint_ed;
/* Save the pending transfer in the ED. */
ed -> ux_stm32_ed_transfer_request = transfer_request;
/* Direction, 0 : Output / 1 : Input */
direction = (transfer_request -> ux_transfer_request_type & UX_REQUEST_DIRECTION) == UX_REQUEST_IN ? 1 : 0;
/* If the direction is OUT, request size is larger than MPS, and DMA is not used, we need to set transfer length to MPS. */
if ((direction == 0) && (transfer_request -> ux_transfer_request_requested_length > endpoint -> ux_endpoint_descriptor.wMaxPacketSize)
#ifndef USB_DRD_FS
&& (hcd_stm32 -> hcd_handle -> Init.dma_enable == 0)
#endif /* USB_DRD_FS */
)
{
/* Set transfer length to MPS. */
length = endpoint -> ux_endpoint_descriptor.wMaxPacketSize;
}
else
{
/* Keep the original transfer length. */
length = transfer_request -> ux_transfer_request_requested_length;
}
/* Save the transfer status in the ED. */
ed -> ux_stm32_ed_status = direction == 0 ? UX_HCD_STM32_ED_STATUS_BULK_OUT : UX_HCD_STM32_ED_STATUS_BULK_IN;
/* Save the transfer length. */
transfer_request -> ux_transfer_request_packet_length = length;
/* Submit the transfer request. */
HAL_HCD_HC_SubmitRequest(hcd_stm32 -> hcd_handle, ed -> ux_stm32_ed_channel,
direction,
EP_TYPE_BULK, USBH_PID_DATA,
transfer_request->ux_transfer_request_data_pointer,
length, 0);
/* Return successful completion. */
return(UX_SUCCESS);
}