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mmc_drv.c
Package: STM32-uCOS-II_UAV.rar [view]
Upload User: yj_qqy
Upload Date: 2017-01-28
Package Size: 2911k
Code Size: 12k
Category:
uCOS
Development Platform:
C/C++
- /*
- **********************************************************************
- * Micrium, Inc.
- * 949 Crestview Circle
- * Weston, FL 33327-1848
- *
- * uC/FS
- *
- * (c) Copyright 2001 - 2003, Micrium, Inc.
- * All rights reserved.
- *
- ***********************************************************************
- ----------------------------------------------------------------------
- File : mmc_drv.c
- Purpose : File system generic MMC/SD driver
- ---------------------------END-OF-HEADER------------------------------
- */
- /*********************************************************************
- *
- * #include Section
- *
- **********************************************************************
- */
- #include <stdio.h>
- #include "fs_api.h"
- #include "fs_clib.h"
- #include "fs_dev.h"
- #if FS_USE_MMC_DRIVER
- #include "bsp.h"
- #include "sddriver.h"
- #include "fs_lbl.h"
- #define FS__DEV_MBRFLAG_CLI 0xFA
- #define FS__DEV_MBRFLAG_JUMP1 0xEB
- #define FS__DEV_MBRFLAG_JUMP2 0xE9
- #define FS__DEV_MBRSECTORFLAG_L 0x55
- #define FS__DEV_MBRSECTORFLAG_H 0xAA
- #define FS__DEV_PART_0_TABLE 0x01BE
- /*********************************************************************
- *
- * Local Variables
- *
- **********************************************************************
- */
- static FS_u32 _FS_mmc_logicalstart[FS_MMC_MAXUNIT]; /* start of partition */
- static char _FS_mmc_mbrbuffer[0x200]; /* buffer for reading MBR */
- static char _FS_mmc_diskchange[FS_MMC_MAXUNIT]; /* signal flag for driver */
- static char _FS_mmc_busycnt[FS_MMC_MAXUNIT]; /* counter for BSY LED on/off */
- /*********************************************************************
- *
- * Local functions
- *
- **********************************************************************
- */
- /*********************************************************************
- *
- * FS_MMC_HW_X_BusyLedOff
- *
- * Description:
- * FS low level function. Switches the busy LED off.
- *
- * Parameters:
- * Unit - Device Index
- *
- * Return value:
- * void
- */
- static void FS_MMC_HW_X_BusyLedOff (FS_u8 Unit) {
- GPIO_ResetBits(GPIOC, DEF_BIT_07);
- }
- /*********************************************************************
- *
- * FS_MMC_HW_X_BusyLedOn
- *
- * Description:
- * FS low level function. Switches the busy LED off.
- *
- * Parameters:
- * Unit - Device Index
- *
- * Return value:
- * void
- */
- static void FS_MMC_HW_X_BusyLedOn(FS_u8 Unit) {
- GPIO_SetBits(GPIOC, DEF_BIT_07);
- }
- /*********************************************************************
- *
- * FS_MMC_HW_X_IsPresent
- *
- * Description:
- * Returns the state of the media. If you do not know the state, return
- * FS_MEDIA_STATEUNKNOWN and the higher layer will try to figure out if
- * a media is present.
- *
- * Parameters:
- * Unit - Device Index
- *
- * Return value:
- * FS_MEDIA_STATEUNKNOWN - the state of the media is unkown
- * FS_MEDIA_ISNOTPRESENT - no card is present
- * FS_MEDIA_ISPRESENT - a card is present
- */
- static char FS_MMC_HW_X_IsPresent(FS_u8 Unit) {
- return FS_MEDIA_STATEUNKNOWN;
- }
- /*********************************************************************
- *
- * FS_GetMediaStartSec
- *
- * Description:
- * FS api function. Get logical start sector from master boot record
- * or partition table.
- *
- * Parameters:
- * DevIndex - DevIndex number.
- * pBuffer - A pointer to a buffer containing the first
- * sector of the media. This should contain the
- * master boot record (MBR) or Bios Parameter Block
- * (BPB) if the device has no partition table.
- *
- * Return value:
- * < 0xFFFF - Number of the first sector of the medium.
- * ==0xFFFF - No valid MBR/BPB found.
- */
- static FS_u32 FS_GetMediaStartSec(const FS_u8 *pBuffer) {
- FS_u8 c;
- FS_u32 StartSec;
- c = pBuffer[0x1FE]; /* check first part of the signature */
- if (c != FS__DEV_MBRSECTORFLAG_L) {
- return 0xFFFFFFFF;
- }
- c = pBuffer[0x1FF]; /* check second part of the signature */
- if (c != FS__DEV_MBRSECTORFLAG_H) {
- return 0xFFFFFFFF;
- }
- c = pBuffer[0x000]; /* check if boot or partition record */
- if (c == FS__DEV_MBRFLAG_JUMP1) {
- return 0; /* if first byte is a jump command, there is no partition table */
- }
- if (c == FS__DEV_MBRFLAG_JUMP2) {
- return 0; /* if first byte is a jump command, there is no partition table */
- } /* this calculation makes sure big/little endian system get the right value from the table */
- /* read first entry of the partition table */
- StartSec = (FS_u32)pBuffer[FS__DEV_PART_0_TABLE + 11] & 0xFFUL;
- StartSec <<= 8;
- StartSec += (FS_u32)pBuffer[FS__DEV_PART_0_TABLE + 10] & 0xFFUL;
- StartSec <<= 8;
- StartSec += (FS_u32)pBuffer[FS__DEV_PART_0_TABLE + 9] & 0xFFUL;
- StartSec <<= 8;
- StartSec += (FS_u32)pBuffer[FS__DEV_PART_0_TABLE + 8] & 0xFFUL;
- return StartSec;
- }
- /*********************************************************************
- *
- * _FS_MMC_DevStatus
- *
- Description:
- FS driver function. Get status of the media.
- Parameters:
- Unit - Unit number.
- Return value:
- ==1 (FS_LBL_MEDIACHANGED) - The media of the device has changed.
- ==0 - Device okay and ready for operation.
- <0 - An error has occured.
- */
- static int _FS_MMC_DevStatus(FS_u32 Unit) {
- static int init = 0;
- int x;
- char a;
- FS_u32 ul;
- FS_MMC_HW_X_BusyLedOn(1);
- if (!init) {
- /*
- The function is called the first time. For each unit,
- the flag for 'diskchange' is set. That makes sure, that
- FS_LBL_MEDIACHANGED is returned, if there is already a
- media in the reader.
- */
- for (init = 0; init < FS_MMC_MAXUNIT; init++) {
- _FS_mmc_diskchange[init] = 1;
- }
- init = 1;
- }
- if (Unit >= FS_MMC_MAXUNIT) {
- return -1; /* No valid unit number */
- }
- a = FS_MMC_HW_X_IsPresent(Unit);/* Check if a card is present */
- if (!a) {
- return -1; /* No card in reader */
- }
- /* When you get here, then there is a card in the reader */
- a = _FS_mmc_diskchange[Unit]; /* Check if the media has changed */
- if (a) {
- /*
- A diskchange took place. The following code reads the MBR of the
- card to get its partition information.
- */
- _FS_mmc_diskchange[Unit] = 0; /* Reset 'diskchange' flag */
- x = SD_Initialize();
- if (x > 0) {
- printf("SD_Initialize error! CODE: 0x%02Xrn", x);
- return -1;
- }
- x = SD_ReadBlock(0, 512, (FS_u8*)&_FS_mmc_mbrbuffer[0]);
- if (x > 0) {
- printf("SD_ReadBlock error! CODE: 0x%02Xrn", x);
- return -1;
- }
- /* Calculate start sector of the first partition */
- ul = FS_GetMediaStartSec((FS_u8*)&_FS_mmc_mbrbuffer[0]);
- if (ul == 0xFFFFFFFF) { /* check if MBR was invalid */
- return -1;
- }
- _FS_mmc_logicalstart[Unit] = ul;
- return FS_LBL_MEDIACHANGED;
- }
- FS_MMC_HW_X_BusyLedOff(1);
- return 0;
- }
- /*********************************************************************
- *
- * _FS_MMC_DevRead
- *
- Description:
- FS driver function. Read a sector from the media.
- Parameters:
- Unit - Unit number.
- Sector - Sector to be read from the device.
- pBuffer - Pointer to buffer for storing the data.
- Return value:
- ==0 - Sector has been read and copied to pBuffer.
- <0 - An error has occured.
- */
- static int _FS_MMC_DevRead(FS_u32 Unit, FS_u32 Sector, void *pBuffer){
- int x;
- if (Unit >= FS_MMC_MAXUNIT) {
- return -1; /* No valid unit number */
- }
- FS_MMC_HW_X_BusyLedOn(1);
- x = SD_ReadBlock(Sector+_FS_mmc_logicalstart[Unit], 512, (FS_u8*)pBuffer);
- if(x > 0) {
- printf("SD_ReadBlock error! CODE: 0x%02Xrn", x);
- x = -1;
- }
- else {
- x = 0;
- }
- FS_MMC_HW_X_BusyLedOff(1);
- return x;
- }
- /*********************************************************************
- *
- * _FS_MMC_DevWrite
- *
- Description:
- FS driver function. Write sector to the media.
- Parameters:
- Unit - Unit number.
- Sector - Sector to be written to the device.
- pBuffer - Pointer to data to be stored.
- Return value:
- ==0 - Sector has been written to the device.
- <0 - An error has occured.
- */
- static int _FS_MMC_DevWrite(FS_u32 Unit, FS_u32 Sector, void *pBuffer){
- int x;
- if (Unit >= FS_MMC_MAXUNIT) {
- return -1; /* No valid unit number */
- }
- FS_MMC_HW_X_BusyLedOn(1);
- x = SD_WriteBlock(Sector+_FS_mmc_logicalstart[Unit], 512, (FS_u8*)pBuffer);
- if (x > 0) {
- printf("SD_WriteBlock error! CODE: 0x%02Xrn", x);
- x = -1;
- }
- else {
- x = 0;
- }
- FS_MMC_HW_X_BusyLedOff(1);
- return x;
- }
- /*********************************************************************
- *
- * _FS_MMC_DevIoCtl
- *
- Description:
- FS driver function. Execute device command.
- Parameters:
- Unit - Unit number.
- Cmd - Command to be executed.
- Aux - Parameter depending on command.
- pBuffer - Pointer to a buffer used for the command.
- Return value:
- Command specific. In general a negative value means an error.
- */
- static int _FS_MMC_DevIoCtl(FS_u32 Unit, FS_i32 Cmd, FS_i32 Aux, void *pBuffer){
- FS_u32 *info, ul;
- int x;
- FS_MMC_HW_X_BusyLedOn(1);
- Aux = Aux; /* Get rid of compiler warning */
- if (Unit >= FS_MMC_MAXUNIT) {
- return -1; /* No valid unit number */
- }
- switch(Cmd){
- case FS_CMD_INC_BUSYCNT:
- _FS_mmc_busycnt[Unit]++;
- if(_FS_mmc_busycnt[Unit] > 0){
- FS_MMC_HW_X_BusyLedOn(Unit);
- }
- break;
- case FS_CMD_DEC_BUSYCNT:
- _FS_mmc_busycnt[Unit]--;
- if(_FS_mmc_busycnt[Unit] <= 0){
- _FS_mmc_busycnt[Unit] = 0;
- FS_MMC_HW_X_BusyLedOff(Unit);
- }
- break;
- case FS_CMD_CHK_DSKCHANGE:
- //a = FS_MMC_HW_X_DetectStatus(Unit);
- //if(a){
- // _FS_mmc_diskchange[Unit] = 1;
- //}
- break;
- case FS_CMD_GET_DEVINFO:
- if (!pBuffer) {
- return -1;
- }
- info = pBuffer;
- x = SD_Initialize();
- if (x > 0) {
- return -1;
- }
- x = SD_ReadBlock(0, 512, (FS_u8*)&_FS_mmc_mbrbuffer[0]);
- if (x > 0) {
- return -1;
- }
- ul = FS_GetMediaStartSec((FS_u8*)&_FS_mmc_mbrbuffer[0]);
- if (ul == 0xFFFFFFFF) { /* check if MBR was invalid */
- return -1;
- }
- if (ul != 0) {
- /* READ (1) 512 BYTE SECTOR */
- x = SD_ReadBlock(ul, 512, (FS_u8*)&_FS_mmc_mbrbuffer[0]);
- if (x > 0) {
- return -1;
- }
- }
- /* hidden */
- *info = _FS_mmc_mbrbuffer[0x1c6];
- *info += (0x100UL * _FS_mmc_mbrbuffer[0x1c7]);
- *info += (0x10000UL * _FS_mmc_mbrbuffer[0x1c8]);
- *info += (0x1000000UL * _FS_mmc_mbrbuffer[0x1c9]);
- info++;
- /* head */
- *info = _FS_mmc_mbrbuffer[0x1c3];
- info++;
- /* sec per track */
- *info = _FS_mmc_mbrbuffer[0x1c4];
- info++;
- /* size */
- *info = _FS_mmc_mbrbuffer[0x1ca];
- *info += (0x100UL * _FS_mmc_mbrbuffer[0x1cb]);
- *info += (0x10000UL * _FS_mmc_mbrbuffer[0x1cc]);
- *info += (0x1000000UL * _FS_mmc_mbrbuffer[0x1cd]);
- break;
- default:
- break;
- }
- FS_MMC_HW_X_BusyLedOff(1);
- return 0;
- }
- /*********************************************************************
- *
- * Global variables
- *
- **********************************************************************
- */
- const FS__device_type FS__mmcdevice_driver = {
- "MMC device",
- _FS_MMC_DevStatus,
- _FS_MMC_DevRead,
- _FS_MMC_DevWrite,
- _FS_MMC_DevIoCtl
- };
- #endif /* FS_USE_MMC_DRIVER */
- /*************************** End of file ****************************/