SD Card Driver on wince4

 

Client Driver

目前，WINCE5.0所支持的client driver如下：

l         SD Memory Class

l         SDIO Bluetooth Class - Type A

l         SDIO WiFi (vendor specific)

如果需要自己写client驱动的话可以参考D:/WINCE500/PUBLIC/COMMON/OAK/DRIVERS/SDCARD/SDCLIENTDRIVERS目录下的微软自带的SD client驱动来写。

【example1: SD MEMORY DRIVER UNDER WINCE 5.0】

Wince自带的SD存储卡client驱动，代码路径为：

D:/WINCE500/PUBLIC/COMMON/OAK/DRIVERS/SDCARD/SDCLIENTDRIVERS/SDMEMORY

一个SD存储卡在WINCE里的驱动架构如下图所示：
[图无法插入]

1注册表和启动

在注册表里告诉Storage Manager

[HKEY_LOCAL_MACHINE/System/StorageManager/Profiles/SDMemory]     "Name"="SD Memory Card"     "Folder"="Storage Card"     ;"PartitionDriver"=""          ; removable storage cannot have partitions [HKEY_LOCAL_MACHINE/System/StorageManager/Profiles/MMC]     "Name"="MMC Card"     "Folder"="Storage Card"     ;"PartitionDriver"=""          ; removable storage cannot have partitions ; SD Memory Storage class driver [HKEY_LOCAL_MACHINE/Drivers/SDCARD/ClientDrivers/Class/SDMemory_Class]    "Dll"="SDMemory.dll"    "Prefix"="DSK"    "BlockTransferSize"=dword:40  ; send no more than 64 blocks of data per bus transfer    ;"SingleBlockWrites"=dword:1  ; alternatively force the driver to use single block access    ;"IdleTimeout"=dword:7D0      ; 2000 milliseconds    ;"IdlePowerState"=dword:2     ; 0 == D0, 1 == D1, etc.    ;"DisablePowerManagement"=""  ; if value present, then disable (remove value to enable)    "Profile"="SDMemory"    "IClass"=multi_sz:"{A4E7EDDA-E575-4252-9D6B-4195D48BB865}",                      "{A32942B7-920C-486b-B0E6-92A702A99B35}" ; MMC Storage Class Driver [HKEY_LOCAL_MACHINE/Drivers/SDCARD/ClientDrivers/Class/MMC_Class]    "Dll"="SDMemory.dll"    "Prefix"="DSK"    "BlockTransferSize"=dword:40  ; send no more than 64 blocks of data per bus transfer    ;"SingleBlockWrites"=dword:1  ; alternatively force the driver to use single block access    ;"IdleTimeout"=dword:7D0      ; milliseconds    ;"IdlePowerState"=dword:2     ; 0 == D0, 1 == D1, etc.    ;"DisablePowerManagement"=""  ; if value present, then disable (remove value to enable)    "Profile"="MMC"    "IClass"=multi_sz:"{A4E7EDDA-E575-4252-9D6B-4195D48BB865}",                      "{A32942B7-920C-486b-B0E6-92A702A99B35}"

2 SD命令和总线要求

将所有磁盘的操作转换成SD的命令和总线要求

NAME SDMEMORY.DLL EXPORTS DSK_Close=SMC_Close DSK_Deinit=SMC_Deinit DSK_Init=SMC_Init DSK_IOControl=SMC_IOControl DSK_Open=SMC_Open DSK_PowerDown=SMC_PowerDown DSK_PowerUp=SMC_PowerUp DSK_Read=SMC_Read DSK_Seek=SMC_Seek DSK_Write=SMC_Write