157 lines
4.5 KiB
C
157 lines
4.5 KiB
C
/*-----------------------------------------------------------------------*/
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/* Low level disk I/O module SKELETON for FatFs (C)ChaN, 2019 */
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/*-----------------------------------------------------------------------*/
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/* If a working storage control module is available, it should be */
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/* attached to the FatFs via a glue function rather than modifying it. */
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/* This is an example of glue functions to attach various exsisting */
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/* storage control modules to the FatFs module with a defined API. */
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/*-----------------------------------------------------------------------*/
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#include "ff.h" /* Obtains integer types */
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#include "diskio.h" /* Declarations of disk functions */
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// #include "ram_disk.h"
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#include <stdio.h>
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/* Definitions of physical drive number for each drive */
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#define DEV_RAM 0 /* Example: Map Ramdisk to physical drive 0 */
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#define DEV_MMC 1 /* Example: Map MMC/SD card to physical drive 1 */
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#define DEV_USB 2 /* Example: Map USB MSD to physical drive 2 */
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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 nmuber to identify the drive */
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)
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{
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DSTATUS stat;
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int result;
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switch (pdrv)
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{
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case DEV_RAM:
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result = 0;
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// translate the reslut code here
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stat = RES_OK;
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return stat;
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}
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return STA_NOINIT;
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}
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/*-----------------------------------------------------------------------*/
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/* Inidialize a Drive */
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/*-----------------------------------------------------------------------*/
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DSTATUS disk_initialize(
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BYTE pdrv /* Physical drive nmuber to identify the drive */
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)
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{
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DSTATUS stat;
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int result;
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switch (pdrv)
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{
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case DEV_RAM:
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result = 0;
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stat = RES_OK;
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// translate the reslut code here
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return stat;
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}
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return STA_NOINIT;
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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 nmuber 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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DRESULT res;
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switch (pdrv)
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{
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case DEV_RAM:
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// translate the reslut code here
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if (ram_disk_read(buff, sector, count) < 0) {
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return RES_ERROR;
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}
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return 0;
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}
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return RES_PARERR;
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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 nmuber 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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int result;
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switch (pdrv)
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{
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case DEV_RAM:
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// translate the arguments here
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if (ram_disk_write((uint8_t *)buff, sector, count) < 0) {
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return RES_ERROR;
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}
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return 0;
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}
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return RES_PARERR;
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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 nmuber (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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DRESULT res;
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int result;
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switch (pdrv)
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{
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case DEV_RAM:
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switch (cmd)
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{ // fatfs内核使用cmd调用
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case GET_SECTOR_COUNT: // sector count, 传入sect_cnt
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*(DWORD *)buff = ram_disk_sector_nr();
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return RES_OK;
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case GET_SECTOR_SIZE: // sector size, 传入block size(SD),单位bytes
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*(DWORD *)buff = 512;
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return RES_OK;
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case GET_BLOCK_SIZE: // block size, 由上文可得，对于SD2.0卡最大8192，最小 1
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*(DWORD *)buff = 1; // 单位为 sector(FatFs)
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return RES_OK;
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case CTRL_SYNC: // 同步命令，貌似FatFs内核用来判断写操作是否完成
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return RES_OK;
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}
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default:
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printf("No device %d.\n", pdrv);
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break;
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}
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return RES_PARERR; // 默认返回参数错误
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}
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