140 lines
4.3 KiB
C
140 lines
4.3 KiB
C
/*-----------------------------------------------------------------------*/
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/* Low level disk I/O module for FatFs with SD card support */
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/*-----------------------------------------------------------------------*/
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#include "ff.h"
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#include "diskio.h"
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#include "sd_card.h"
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#include <string.h>
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/* Definitions of physical drive number for each drive */
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#define DEV_SD 0 /* SD card */
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/*-----------------------------------------------------------------------*/
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/* Get Drive Status */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_status (
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BYTE pdrv /* Physical drive number to identify the drive */
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)
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{
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if (pdrv != DEV_SD) return STA_NOINIT;
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// Assume SD card is always initialized after sd_card_init() is called
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return 0; // OK
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}
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/*-----------------------------------------------------------------------*/
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/* Initialize a Drive */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_initialize (
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BYTE pdrv /* Physical drive number to identify the drive */
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)
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{
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if (pdrv != DEV_SD) return STA_NOINIT;
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// SD card should already be initialized via sd_card_init()
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return 0; // OK
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}
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/*-----------------------------------------------------------------------*/
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/* Read Sector(s) */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_read (
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BYTE pdrv, /* Physical drive number to identify the drive */
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BYTE *buff, /* Data buffer to store read data */
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LBA_t sector, /* Start sector in LBA */
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UINT count /* Number of sectors to read */
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)
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{
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if (pdrv != DEV_SD) return RES_PARERR;
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for (UINT i = 0; i < count; i++) {
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if (!sd_card_read_block(sector + i, buff + (i * 512))) {
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return RES_ERROR;
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}
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}
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return RES_OK;
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}
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/*-----------------------------------------------------------------------*/
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/* Write Sector(s) */
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/*-----------------------------------------------------------------------*/
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#if FF_FS_READONLY == 0
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DRESULT disk_write (
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BYTE pdrv, /* Physical drive number to identify the drive */
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const BYTE *buff, /* Data to be written */
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LBA_t sector, /* Start sector in LBA */
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UINT count /* Number of sectors to write */
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)
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{
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if (pdrv != DEV_SD) return RES_PARERR;
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for (UINT i = 0; i < count; i++) {
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if (!sd_card_write_block(sector + i, (uint8_t*)(buff + (i * 512)))) {
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return RES_ERROR;
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}
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}
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return RES_OK;
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}
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#endif
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/*-----------------------------------------------------------------------*/
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/* Miscellaneous Functions */
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/*-----------------------------------------------------------------------*/
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DRESULT disk_ioctl (
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BYTE pdrv, /* Physical drive number (0..) */
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BYTE cmd, /* Control code */
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void *buff /* Buffer to send/receive control data */
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)
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{
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if (pdrv != DEV_SD) return RES_PARERR;
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DRESULT res = RES_ERROR;
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switch (cmd) {
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case CTRL_SYNC:
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// Complete pending write process (if needed)
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res = RES_OK;
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break;
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case GET_SECTOR_COUNT:
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// Get number of sectors on the disk (DWORD)
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{
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sd_card_info_t info;
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if (sd_card_get_info(&info)) {
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// Calculate total sectors from capacity
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// capacity_mb * 1024 * 1024 / 512 = capacity_mb * 2048
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*(LBA_t*)buff = (LBA_t)info.capacity_mb * 2048;
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res = RES_OK;
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}
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}
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break;
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case GET_SECTOR_SIZE:
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// Get sector size (WORD)
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*(WORD*)buff = 512;
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res = RES_OK;
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break;
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case GET_BLOCK_SIZE:
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// Get erase block size in unit of sector (DWORD)
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*(DWORD*)buff = 1; // Single sector erase
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res = RES_OK;
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break;
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default:
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res = RES_PARERR;
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}
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return res;
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}
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