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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 */
/** */
/** RAM Disk Driver */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#include "fx_stm32_sram_driver.h"
static UINT is_initialized = 0;
VOID fx_stm32_sram_driver(FX_MEDIA *media_ptr)
{
UCHAR *source_buffer;
UCHAR *destination_buffer;
UINT bytes_per_sector;
/* Process the driver request specified in the media control block. */
switch (media_ptr->fx_media_driver_request)
{
case FX_DRIVER_INIT:
{
/*
* the FX_DRIVER_INIT can be requested either from the fx_media_format() or fx_media_open()
* as the RAM meory should be always formatted before being used, by memset'ing it to '\0'
* we need to avoid double initialization to keep the file system integrity.
*/
if (is_initialized == 0)
{
_fx_utility_memory_set((UCHAR *)FX_SRAM_DISK_BASE_ADDRESS, '\0', FX_SRAM_DISK_SIZE);
is_initialized = 1;
}
media_ptr -> fx_media_driver_status = FX_SUCCESS;
break;
}
case FX_DRIVER_UNINIT:
{
/* there is nothing to do for FX_DRIVER_UNINIT request
* set the media driver status to FX_SUCCESS.
*/
media_ptr -> fx_media_driver_status = FX_SUCCESS;
break;
}
case FX_DRIVER_READ:
{
/* Calculate the RAM disk sector offset.*/
source_buffer = ((UCHAR *)FX_SRAM_DISK_BASE_ADDRESS) +
((media_ptr->fx_media_driver_logical_sector + media_ptr->fx_media_hidden_sectors) * media_ptr->fx_media_bytes_per_sector);
/* Copy the RAM sector into the destination. */
_fx_utility_memory_copy(source_buffer, media_ptr -> fx_media_driver_buffer,
media_ptr->fx_media_driver_sectors * media_ptr->fx_media_bytes_per_sector);
/* Successful driver request. */
media_ptr->fx_media_driver_status = FX_SUCCESS;
break;
}
case FX_DRIVER_WRITE:
{
/* Calculate the RAM disk sector offset */
destination_buffer = (UCHAR *)FX_SRAM_DISK_BASE_ADDRESS +
((media_ptr->fx_media_driver_logical_sector + media_ptr->fx_media_hidden_sectors) * media_ptr->fx_media_bytes_per_sector);
/* Copy the source to the RAM sector. */
_fx_utility_memory_copy(media_ptr->fx_media_driver_buffer, destination_buffer,
media_ptr->fx_media_driver_sectors * media_ptr->fx_media_bytes_per_sector);
/* Successful driver request. */
media_ptr -> fx_media_driver_status = FX_SUCCESS;
break;
}
case FX_DRIVER_FLUSH:
{
/*
* Nothing to do for the FX_DRIVER_FLUSH Return driver success.
*/
media_ptr->fx_media_driver_status = FX_SUCCESS;
break;
}
case FX_DRIVER_ABORT:
{
/*
* Nothing to do for the FX_DRIVER_ABORT Return driver success.
*/
media_ptr->fx_media_driver_status = FX_SUCCESS;
break;
}
case FX_DRIVER_BOOT_READ:
{
/* Calculate the RAM disk boot sector offset, which is at the very beginning of
* the RAM disk.
*/
source_buffer = (UCHAR *)FX_SRAM_DISK_BASE_ADDRESS;
/* For RAM disk only, pickup the bytes per sector.*/
bytes_per_sector = _fx_utility_16_unsigned_read(&source_buffer[FX_BYTES_SECTOR]);
/* Ensure this is less than the media memory size. */
if (bytes_per_sector > media_ptr->fx_media_memory_size)
{
media_ptr->fx_media_driver_status = FX_BUFFER_ERROR;
break;
}
/* Copy the RAM boot sector into the destination. */
_fx_utility_memory_copy(source_buffer, media_ptr -> fx_media_driver_buffer,
bytes_per_sector);
/* Successful driver request. */
media_ptr -> fx_media_driver_status = FX_SUCCESS;
break;
}
case FX_DRIVER_BOOT_WRITE:
{
/*
* Calculate the RAM disk boot sector offset, which is at the very beginning of the RAM disk.
*/
destination_buffer = (UCHAR *)FX_SRAM_DISK_BASE_ADDRESS;
/* Copy the RAM boot sector into the destination. */
_fx_utility_memory_copy(media_ptr->fx_media_driver_buffer, destination_buffer,
media_ptr->fx_media_bytes_per_sector);
/* Successful driver request. */
media_ptr -> fx_media_driver_status = FX_SUCCESS;
break;
}
default:
{
/* Invalid driver request. */
media_ptr -> fx_media_driver_status = FX_IO_ERROR;
break;
}
}
}
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