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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 */
/** */
/** EHCI Controller Driver */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#define UX_SOURCE_CODE
#include "ux_api.h"
#include "ux_hcd_ehci.h"
#include "ux_host_stack.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _ux_hcd_ehci_frame_number_set PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* Chaoqiong Xiao, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function will set the current frame number to the one */
/* specified. This function is mostly used for isochronous purposes. */
/* */
/* INPUT */
/* */
/* hcd_ehci Pointer to EHCI controller */
/* frame_number Frame number */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _ux_hcd_ehci_register_read Read EHCI register */
/* _ux_hcd_ehci_register_write Write EHCI register */
/* */
/* CALLED BY */
/* */
/* EHCI Controller Driver */
/* */
/**************************************************************************/
VOID _ux_hcd_ehci_frame_number_set(UX_HCD_EHCI *hcd_ehci, ULONG frame_number)
{
ULONG ehci_register;
/* It is illegal in EHCI to set the frame number while the controller is
running. */
ehci_register = _ux_hcd_ehci_register_read(hcd_ehci, EHCI_HCOR_USB_COMMAND);
if (ehci_register & EHCI_HC_IO_RS)
return;
/* The register is based on micro frames, so we need to multiply the
value by 8 to get to the millisecond frame number. */
ehci_register = frame_number << 3;
/* Write the frame number, by default the micro frame will be set to 0. */
_ux_hcd_ehci_register_write(hcd_ehci, EHCI_HCOR_FRAME_INDEX, ehci_register);
/* Return to caller. */
return;
}
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