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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 */
/** */
/** Device Stack */
/** */
/**************************************************************************/
/**************************************************************************/
#define UX_SOURCE_CODE
/* Include necessary system files. */
#include "ux_api.h"
#include "ux_device_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_device_stack_transfer_request PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function performs a USB transaction. On entry the */
/* transfer request gives the endpoint pipe selected for this */
/* transaction and the parameters associated with the transfer */
/* (data payload, length of transaction). */
/* */
/* INPUT */
/* */
/* transfer_request Pointer to transfer request */
/* slave_length Length returned by host */
/* host_length Length asked by host */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* (ux_slave_dcd_function) Slave DCD dispatch function */
/* _ux_utility_delay_ms Delay ms */
/* */
/* CALLED BY */
/* */
/* Application */
/* Device Stack */
/* */
/**************************************************************************/
UINT _ux_device_stack_transfer_request(UX_SLAVE_TRANSFER *transfer_request,
ULONG slave_length,
ULONG host_length)
{
#if defined(UX_DEVICE_STANDALONE)
UINT status;
/* Start a transfer request without waiting it end. */
UX_SLAVE_TRANSFER_STATE_RESET(transfer_request);
status = _ux_device_stack_transfer_run(transfer_request, slave_length, host_length);
if (status == UX_STATE_LOCK)
return(UX_BUSY);
if (status < UX_STATE_NEXT)
return(transfer_request -> ux_slave_transfer_request_completion_code);
/* Started/done, things will be done in BG */
return(UX_SUCCESS);
#else
UX_INTERRUPT_SAVE_AREA
UX_SLAVE_DCD *dcd;
UINT status;
UX_SLAVE_ENDPOINT *endpoint;
ULONG device_state;
/* Do we have to skip this transfer? */
if (transfer_request -> ux_slave_transfer_request_status_phase_ignore == UX_TRUE)
return(UX_SUCCESS);
/* Disable interrupts to prevent the disconnection ISR from preempting us
while we check the device state and set the transfer status. */
UX_DISABLE
/* Get the device state. */
device_state = _ux_system_slave -> ux_system_slave_device.ux_slave_device_state;
/* We can only transfer when the device is ATTACHED, ADDRESSED OR CONFIGURED. */
if ((device_state == UX_DEVICE_ATTACHED) || (device_state == UX_DEVICE_ADDRESSED)
|| (device_state == UX_DEVICE_CONFIGURED))
/* Set the transfer to pending. */
transfer_request -> ux_slave_transfer_request_status = UX_TRANSFER_STATUS_PENDING;
else
{
/* The device is in an invalid state. Restore interrupts and return error. */
UX_RESTORE
return(UX_TRANSFER_NOT_READY);
}
/* Restore interrupts. */
UX_RESTORE
/* If trace is enabled, insert this event into the trace buffer. */
UX_TRACE_IN_LINE_INSERT(UX_TRACE_DEVICE_STACK_TRANSFER_REQUEST, transfer_request, 0, 0, 0, UX_TRACE_DEVICE_STACK_EVENTS, 0, 0)
/* Get the pointer to the DCD. */
dcd = &_ux_system_slave -> ux_system_slave_dcd;
/* Get the endpoint associated with this transaction. */
endpoint = transfer_request -> ux_slave_transfer_request_endpoint;
/* If the endpoint is non Control, check the endpoint direction and set the data phase direction. */
if ((endpoint -> ux_slave_endpoint_descriptor.bmAttributes & UX_MASK_ENDPOINT_TYPE) != UX_CONTROL_ENDPOINT)
{
/* Check if the endpoint is STALLED. In this case, we must refuse the transaction until the endpoint
has been reset by the host. */
while (endpoint -> ux_slave_endpoint_state == UX_ENDPOINT_HALTED)
/* Wait for 100ms for endpoint to be reset by a CLEAR_FEATURE command. */
_ux_utility_delay_ms(100);
/* Isolate the direction from the endpoint address. */
if ((endpoint -> ux_slave_endpoint_descriptor.bEndpointAddress & UX_ENDPOINT_DIRECTION) == UX_ENDPOINT_IN)
transfer_request -> ux_slave_transfer_request_phase = UX_TRANSFER_PHASE_DATA_OUT;
else
transfer_request -> ux_slave_transfer_request_phase = UX_TRANSFER_PHASE_DATA_IN;
}
/* See if we need to force a zero length packet at the end of the transfer.
This happens on a DATA IN and when the host requested length is not met
and the last packet is on a boundary. If slave_length is zero, then it is
a explicit ZLP request, no need to force ZLP. */
if ((transfer_request -> ux_slave_transfer_request_phase == UX_TRANSFER_PHASE_DATA_OUT) &&
(slave_length != 0) && (host_length != slave_length) &&
(slave_length % endpoint -> ux_slave_endpoint_descriptor.wMaxPacketSize) == 0)
{
/* If so force Zero Length Packet. */
transfer_request -> ux_slave_transfer_request_force_zlp = UX_TRUE;
}
else
{
/* Condition is not met, do not force a Zero Length Packet. */
transfer_request -> ux_slave_transfer_request_force_zlp = UX_FALSE;
}
/* Reset the number of bytes sent/received. */
transfer_request -> ux_slave_transfer_request_actual_length = 0;
/* Determine how many bytes to send in this transaction. We keep track of the original
length and have a working length. */
transfer_request -> ux_slave_transfer_request_requested_length = slave_length;
transfer_request -> ux_slave_transfer_request_in_transfer_length = slave_length;
/* Save the buffer pointer. */
transfer_request -> ux_slave_transfer_request_current_data_pointer =
transfer_request -> ux_slave_transfer_request_data_pointer;
/* Call the DCD driver transfer function. */
status = dcd -> ux_slave_dcd_function(dcd, UX_DCD_TRANSFER_REQUEST, transfer_request);
/* And return the status. */
return(status);
#endif
}
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