filex/samples/demo_filex.c

/* This is a small demo of the high-performance FileX FAT file system. It includes setup for
   a small 34KB RAM disk and a loop that writes and reads a small file.  */
#include "fx_api.h"
#ifdef FX_ENABLE_FAULT_TOLERANT
#include "fx_fault_tolerant.h"
#endif /* FX_ENABLE_FAULT_TOLERANT */

#define DEMO_STACK_SIZE 2048


/* Buffer for FileX FX_MEDIA sector cache. This must be large enough for at least one
   sector, which are typically 512 bytes in size.  */

unsigned char media_memory[512];

#ifdef FX_ENABLE_FAULT_TOLERANT
UCHAR         fault_tolerant_memory[FX_FAULT_TOLERANT_MAXIMUM_LOG_FILE_SIZE];
#endif /* FX_ENABLE_FAULT_TOLERANT */


/* Define RAM device driver entry.  */

VOID _fx_ram_driver(FX_MEDIA *media_ptr);


/* Define thread prototypes.  */

void    thread_0_entry(ULONG thread_input);


/* Define FileX global data structures.  */

FX_MEDIA        ram_disk;
FX_FILE         my_file;

#ifndef FX_STANDALONE_ENABLE
CHAR            *ram_disk_memory;
#else
unsigned char   ram_disk_memory[256*512];
#endif

/* Define ThreadX global data structures.  */

#ifndef FX_STANDALONE_ENABLE
TX_THREAD       thread_0;
#endif
ULONG           thread_0_counter;


void  main(void)
{

#ifdef FX_STANDALONE_ENABLE  

    /* Initialize FileX.  */
    fx_system_initialize();
  
    thread_0_entry(0);
#else
    /* Enter the ThreadX kernel.  */
    tx_kernel_enter();
#endif

}


/* Define what the initial system looks like.  */

#ifndef FX_STANDALONE_ENABLE
void    tx_application_define(void *first_unused_memory)
{

CHAR *pointer;

    /* Put first available memory address into a character pointer.  */
    pointer =  (CHAR *) first_unused_memory;

    /* Put system definition stuff in here, e.g. thread creates and other assorted
       create information.  */

    /* Create the main thread.  */
    tx_thread_create(&thread_0, "thread 0", thread_0_entry, 0,
            pointer, DEMO_STACK_SIZE,
            1, 1, TX_NO_TIME_SLICE, TX_AUTO_START);
    pointer = pointer + DEMO_STACK_SIZE;

    /* Save the memory pointer for the RAM disk.  */
    ram_disk_memory =  pointer;

    /* Initialize FileX.  */
    fx_system_initialize();
}

#endif

void    thread_0_entry(ULONG thread_input)
{

UINT  status;
ULONG actual;
CHAR  local_buffer[30];


    /* Format the RAM disk - the memory for the RAM disk was setup in
       tx_application_define above.  */
    fx_media_format(&ram_disk,
                    _fx_ram_driver,               // Driver entry
                    ram_disk_memory,              // RAM disk memory pointer
                    media_memory,                 // Media buffer pointer
                    sizeof(media_memory),         // Media buffer size
                    "MY_RAM_DISK",                // Volume Name
                    1,                            // Number of FATs
                    32,                           // Directory Entries
                    0,                            // Hidden sectors
                    256,                          // Total sectors
                    512,                          // Sector size
                    8,                            // Sectors per cluster
                    1,                            // Heads
                    1);                           // Sectors per track


    /* Loop to repeat the demo over and over!  */
    do
    {

        /* Open the RAM disk.  */
        status =  fx_media_open(&ram_disk, "RAM DISK", _fx_ram_driver, ram_disk_memory, media_memory, sizeof(media_memory));

        /* Check the media open status.  */
        if (status != FX_SUCCESS)
        {

            /* Error, break the loop!  */
            break;
        }

#ifdef FX_ENABLE_FAULT_TOLERANT
        status = fx_fault_tolerant_enable(&ram_disk, fault_tolerant_memory, sizeof(fault_tolerant_memory));

        if (status != FX_SUCCESS)
        {

            /* Fault tolerant enable error, break the loop.  */
            break;
        }
#endif /* FX_ENABLE_FAULT_TOLERANT */

        /* Create a file called TEST.TXT in the root directory.  */
        status =  fx_file_create(&ram_disk, "TEST.TXT");

        /* Check the create status.  */
        if (status != FX_SUCCESS)
        {

            /* Check for an already created status. This is expected on the
               second pass of this loop!  */
            if (status != FX_ALREADY_CREATED)
            {

                /* Create error, break the loop.  */
                break;
            }
        }

        /* Open the test file.  */
        status =  fx_file_open(&ram_disk, &my_file, "TEST.TXT", FX_OPEN_FOR_WRITE);

        /* Check the file open status.  */
        if (status != FX_SUCCESS)
        {

            /* Error opening file, break the loop.  */
            break;
        }

        /* Seek to the beginning of the test file.  */
        status =  fx_file_seek(&my_file, 0);

        /* Check the file seek status.  */
        if (status != FX_SUCCESS)
        {

            /* Error performing file seek, break the loop.  */
            break;
        }

        /* Write a string to the test file.  */
        status =  fx_file_write(&my_file, " ABCDEFGHIJKLMNOPQRSTUVWXYZ\n", 28);

        /* Check the file write status.  */
        if (status != FX_SUCCESS)
        {

            /* Error writing to a file, break the loop.  */
            break;
        }

        /* Seek to the beginning of the test file.  */
        status =  fx_file_seek(&my_file, 0);

        /* Check the file seek status.  */
        if (status != FX_SUCCESS)
        {

            /* Error performing file seek, break the loop.  */
            break;
        }

        /* Read the first 28 bytes of the test file.  */
        status =  fx_file_read(&my_file, local_buffer, 28, &actual);

        /* Check the file read status.  */
        if ((status != FX_SUCCESS) || (actual != 28))
        {

            /* Error reading file, break the loop.  */
            break;
        }

        /* Close the test file.  */
        status =  fx_file_close(&my_file);

        /* Check the file close status.  */
        if (status != FX_SUCCESS)
        {

            /* Error closing the file, break the loop.  */
            break;
        }

        /* Close the media.  */
        status =  fx_media_close(&ram_disk);

        /* Check the media close status.  */
        if (status != FX_SUCCESS)
        {

            /* Error closing the media, break the loop.  */
            break;
        }

        /* Increment the thread counter, which represents the number
           of successful passes through this loop.  */
        thread_0_counter++;

    } while (1);

    /* If we get here the FileX test failed!  */
    return;
}