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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. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** FileX Component */
/** */
/** Media */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
/* Include necessary system files. */
#include "fx_api.h"
#include "fx_system.h"
#include "fx_media.h"
#include "fx_utility.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_media_read PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function reads the specified raw logical sector from the */
/* specified media. */
/* */
/* INPUT */
/* */
/* media_ptr Media control block pointer */
/* logical_sector Logical sector to read */
/* buffer_ptr Pointer to caller's buffer */
/* */
/* OUTPUT */
/* */
/* return status */
/* */
/* CALLS */
/* */
/* _fx_utility_logical_sector_read Logical sector read utility */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 William E. Lamie Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _fx_media_read(FX_MEDIA *media_ptr, ULONG logical_sector, VOID *buffer_ptr)
{
UINT status;
#ifdef TX_ENABLE_EVENT_TRACE
TX_TRACE_BUFFER_ENTRY *trace_event;
ULONG trace_timestamp;
#endif
#ifndef FX_MEDIA_STATISTICS_DISABLE
/* Increment the number of times this service has been called. */
media_ptr -> fx_media_reads++;
#endif
/* Check the media to make sure it is open. */
if (media_ptr -> fx_media_id != FX_MEDIA_ID)
{
/* Return the media not opened error. */
return(FX_MEDIA_NOT_OPEN);
}
/* If trace is enabled, insert this event into the trace buffer. */
FX_TRACE_IN_LINE_INSERT(FX_TRACE_MEDIA_READ, media_ptr, logical_sector, buffer_ptr, 0, FX_TRACE_MEDIA_EVENTS, &trace_event, &trace_timestamp)
/* Protect against other threads accessing the media. */
FX_PROTECT
/* Read the logical sector. */
status = _fx_utility_logical_sector_read(media_ptr, (ULONG64) logical_sector, buffer_ptr, ((ULONG) 1), FX_DATA_SECTOR);
#ifdef TX_ENABLE_EVENT_TRACE
/* Check for successful status. */
if (status == FX_SUCCESS)
{
/* Update the trace event with the bytes read. */
FX_TRACE_EVENT_UPDATE(trace_event, trace_timestamp, FX_TRACE_MEDIA_READ, 0, 0, 0, media_ptr -> fx_media_bytes_per_sector)
}
#endif
/* Release media protection. */
FX_UNPROTECT
/* Return status to the caller. */
return(status);
}