/*-----------------------------------------------------------------------*/
/* 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 "DrvRtcI2c.h"
#include "DrvSdSpi.h"

/* Definitions of physical drive number for each drive */
#define SD_CARD		0	
#define EX_FLASH    1	


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

DSTATUS disk_status (
	BYTE pdrv		/* Physical drive nmuber (0..) */
)
{ 
	return 0;
} 



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

DSTATUS disk_initialize (
	BYTE pdrv		/* Physical drive nmuber to identify the drive */
)
{
	uint8_t res=0;	    
	switch(pdrv)
	{
		case SD_CARD://SD卡
			res = Drv_SdInit();
		 	if(res)// SPI的bug,在sd卡操作失败的时候如果不执行下面的语句,可能导致SPI读写异常
			{
				Drv_SdSpiSetSpeed(USR_DRV_SD_HIGH_SPEED_MODE);
				Drv_SdSpiRWByte(0xff);//提供额外的8个时钟
			}
  			break;
		case EX_FLASH://外部flash
			
 			break;
		default:
			res=1; 
	}		 
	if(res)return  STA_NOINIT;
	else return 0; //初始化成功
}



/*-----------------------------------------------------------------------*/
/* 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 SD_CARD :
        result = Drv_SdReadDisk(buff, sector, count);
        if (result != 0) {
            Drv_SdSpiRWByte(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 SD_CARD :
        // translate the arguments here
        result = Drv_SdWriteDisk((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 == SD_CARD)
    {
        switch(cmd)
        {
            case CTRL_SYNC:
                Drv_SdSpiCs(0);
                if(Drv_SdWaitReady() == 0) {
                    result = RES_OK;
                } else {
                    result = RES_ERROR;    
                }                    
                Drv_SdSpiCs(1);
                break;
            /* 由于SD卡的SECTOR与BLOCK跟Fatfs中的含义不同，Fatfs的SECTOR等于
               SD卡的BLOCK，所以Fatfs的SECTOR为固定值512 byte。Fatfs的block
               的size即是SD卡AUsize/SD卡的最小BLOCK（512），因为大于1GB的AUsizemax
               为4MB，所以取值范围为1~8192
             */
            case GET_SECTOR_SIZE:
                *(WORD*)buff = 512; // 因为在宏定义设置中已经设置，设置为512。
                result = RES_OK;
                break;     
            case GET_BLOCK_SIZE:
                // 单位为 sector(FatFs)，取值范围为1~8192(8192根据SD存储大小变化而变化)
                *(WORD*)buff = 8;
                result = RES_OK;
                break;     
            case GET_SECTOR_COUNT:
                *(DWORD*)buff = Drv_SdGetSectorCount();
                result = RES_OK;
                break;
            default:
                result = RES_PARERR;
                break;
        }
    } else {
        result = RES_ERROR;
    }
    return result;
}

DWORD get_fattime (void)
{
    USR_DRV_RTC_I2C_TIME time;
    if (0 == DrvRtcI2CGetTime(&time)) {
        if (time.year != 0 && time.month != 0 && time.date != 0) {
            return (((uint32_t)time.year - 1980) << 25)
                    | ((uint32_t)time.month << 21)
                    | ((uint32_t)time.date << 16)
                    | ((uint32_t)time.hour << 11)
                    | ((uint32_t)time.minute << 5)
                    | ((uint32_t)time.second);
        }
    }
    return ((2023UL-1980) << 25) /* Year = 2010 */
    | (5UL << 21) /* Month = 11 */
    | (5UL << 16) /* Day = 2 */
    | (10U << 11) /* Hour = 15 */
    | (17U << 5) /* Min = 0 */
    | (5U >> 1) /* Sec = 0 */
    ;
}