/* Glue functions to bind FatFS to rest of the system. */

#include "fatfs/ff.h"
#include "FreeRTOS.h"
#include "semphr.h"
#include <stdio.h>

static FATFS fs;
xSemaphoreHandle mmc_dma_semaphore;

void fatfs_init()
{
    // Initialize filesystem structure
    FRESULT status = f_mount(0, &fs);
    if (status != FR_OK)
    {
        fprintf(stderr, "f_mount: %d\n", status);
    }
    
    // Semaphore to communicate between ISR and main thread in mmc.c
    vSemaphoreCreateBinary(mmc_dma_semaphore);
    xSemaphoreTake(mmc_dma_semaphore, 0); // Clear semaphore
}

DWORD get_fattime (void)
{
        /* Pack date and time into a DWORD variable */
        return    ((DWORD)(2000 - 1980) << 25)
                        | ((DWORD)1 << 21)
                        | ((DWORD)1 << 16)
                        | ((DWORD)13 << 11)
                        | ((DWORD)37 << 5)
                        | ((DWORD)0 >> 1);
}

/* Create a sync object */
int ff_cre_syncobj (BYTE volume, _SYNC_t* dest)
{
    *dest = xSemaphoreCreateMutex();
    return *dest != NULL;
}

/* Lock sync object */
int ff_req_grant (_SYNC_t mutex)
{
    return xSemaphoreTake(mutex, _FS_TIMEOUT);
}

/* Unlock sync object */
void ff_rel_grant (_SYNC_t mutex)
{
    xSemaphoreGive(mutex);
}
    
/* Delete a sync object */
int ff_del_syncobj (_SYNC_t mutex)
{
    vQueueDelete(mutex);
    return 1;
}