/*-----------------------------------------------------------------------*/
/* Low level disk I/O module SKELETON for FatFs     (C)ChaN, 2019        */
/*-----------------------------------------------------------------------*/
/* If a working storage control module is available, it should be        */
/* attached to the FatFs via a glue function rather than modifying it.   */
/* This is an example of glue functions to attach various exsisting      */
/* storage control modules to the FatFs module with a defined API.       */
/*-----------------------------------------------------------------------*/

#include "ff.h"			/* Obtains integer types */
#include "diskio.h"		/* Declarations of disk functions */
#include "usr_drv_sd_spi.h"

/* Definitions of physical drive number for each drive */
#define DEV_SDHC		0	/* Example: Map Ramdisk to physical drive 0 */

/*-----------------------------------------------------------------------*/
/* Get Drive Status                                                      */
/*-----------------------------------------------------------------------*/

DSTATUS disk_status (
	BYTE pdrv		/* Physical drive nmuber to identify the drive */
)
{
	switch (pdrv) {
	case DEV_SDHC:
		return RES_OK;
	}
	return STA_NOINIT;
}



/*-----------------------------------------------------------------------*/
/* Inidialize a Drive                                                    */
/*-----------------------------------------------------------------------*/

DSTATUS disk_initialize (
	BYTE pdrv				/* Physical drive nmuber to identify the drive */
)
{
	uint8_t result;

	switch (pdrv) {
	case DEV_SDHC :
		result = usr_drv_sd_init();
        if (result != 0x00) {
            usr_drv_sd_spi_set_speed_mode(USR_DRV_SD_HIGH_SPEED_MODE);
            usr_drv_sd_spi_read_write_byte(0xff);
            break;
        }
		return RES_OK;
	}
	return STA_NOINIT;
}



/*-----------------------------------------------------------------------*/
/* Read Sector(s)                                                        */
/*-----------------------------------------------------------------------*/

DRESULT disk_read (
	BYTE pdrv,		/* Physical drive nmuber to identify the drive */
	BYTE *buff,		/* Data buffer to store read data */
	LBA_t sector,	/* Start sector in LBA */
	UINT count		/* Number of sectors to read */
)
{
	uint8_t result;
    if (!count) {
        return RES_PARERR;//count不能等于0，否则返回参数错误
    }
	switch (pdrv) {
	case DEV_SDHC :
		result = usr_drv_sd_read_disk(buff, sector, count);
		if (result != 0) {
            usr_drv_sd_spi_read_write_byte(0xff);
            return RES_ERROR;
        }
        return RES_OK;
	}

	return RES_PARERR;
}



/*-----------------------------------------------------------------------*/
/* Write Sector(s)                                                       */
/*-----------------------------------------------------------------------*/

#if FF_FS_READONLY == 0

DRESULT disk_write (
	BYTE pdrv,			/* Physical drive nmuber to identify the drive */
	const BYTE *buff,	/* Data to be written */
	LBA_t sector,		/* Start sector in LBA */
	UINT count			/* Number of sectors to write */
)
{
	uint8_t result;

	switch (pdrv) {
	case DEV_SDHC :
		// translate the arguments here

		result = usr_drv_sd_write_disk((uint8_t*)buff, sector, count);
        if (result == 0x00) {
            return RES_OK;
        } else {
            return RES_ERROR;
        }
		
    }
	return RES_PARERR;
}

#endif


/*-----------------------------------------------------------------------*/
/* Miscellaneous Functions                                               */
/*-----------------------------------------------------------------------*/

DRESULT disk_ioctl (
	BYTE pdrv,		/* Physical drive nmuber (0..) */
	BYTE cmd,		/* Control code */
	void *buff		/* Buffer to send/receive control data */
)
{
	DRESULT result;						  			     
	if(pdrv == DEV_SDHC)//SD卡
	{
	    switch(cmd)
	    {
		    case CTRL_SYNC:
				usr_drv_sd_spi_cs(0);
		        if(usr_drv_sd_wait_ready() == 0) {
                    result = RES_OK;
                } else {
                    result = RES_ERROR;	
                }                    
				usr_drv_sd_spi_cs(1);
		        break;	 
		    case GET_SECTOR_SIZE:
		        *(WORD*)buff = 512;
		        result = RES_OK;
		        break;	 
		    case GET_BLOCK_SIZE:
		        *(WORD*)buff = 8;
		        result = RES_OK;
		        break;	 
		    case GET_SECTOR_COUNT:
		        *(DWORD*)buff = usr_drv_sd_get_sector_count();
		        result = RES_OK;
		        break;
		    default:
		        result = RES_PARERR;
		        break;
	    }
	} else {
        result = RES_ERROR;//其他的不支持
    }
    return result;
}

/*---------------------------------------------------------*/
/* User Provided Timer Function for FatFs module           */
/*---------------------------------------------------------*/
/* This is a real time clock service to be called from     */
/* FatFs module. Any valid time must be returned even if   */
/* the system does not support a real time clock.          */

DWORD get_fattime (void)
{
    return ((2010UL-1980) << 25) /* Year = 2010 */
    | (11UL << 21) /* Month = 11 */
    | (2UL << 16) /* Day = 2 */
    | (15U << 11) /* Hour = 15 */
    | (0U << 5) /* Min = 0 */
    | (0U >> 1) /* Sec = 0 */
    ;
}