C8051F340 procedures to read and write SD card is the official example of detailed notes, very good, can use 340 as a card reader. Recommended download. This is one example, there are examples of 2

1.Firmware
..........\c8051F340.h
..........\C8051F340.INC
..........\cyglink.txt
..........\F34X_MSD.M51
..........\F34X_MSD.OMF
..........\F34x_MSD.wsp
..........\F34x_MSD_CF_Basic_Functions.c
..........\F34x_MSD_CF_Basic_Functions.h
..........\F34x_MSD_Cmd.c
..........\F34x_MSD_Cmd.h
..........\F34x_MSD_Definitions.h
..........\F34x_MSD_Dir_Commands.c
..........\F34x_MSD_Dir_Commands.h
..........\F34x_MSD_File_System.c
..........\F34x_MSD_File_System.h
..........\F34x_MSD_Format_Disk.c
..........\F34x_MSD_Format_Disk.h
..........\F34x_MSD_Get_Char.c
..........\F34x_MSD_Get_Char.h
..........\F34x_MSD_Log.c
..........\F34x_MSD_Log.h
..........\F34x_MSD_MMC.c
..........\F34x_MSD_MMC.h
..........\F34x_MSD_MMC_Command.asm
..........\F34x_MSD_MSD.c
..........\F34x_MSD_MSD.h
..........\F34x_MSD_Physical_Settings.h
..........\F34x_MSD_Put_Char.c
..........\F34x_MSD_Put_Char.h
..........\F34x_MSD_Scsi.c
..........\F34x_MSD_Scsi.h
..........\F34x_MSD_Sect_Serv.c
..........\F34x_MSD_Sect_Serv.h
..........\F34x_MSD_Temp_Sensor.c
..........\F34x_MSD_Temp_Sensor.h
..........\F34x_MSD_UART.c
..........\F34x_MSD_UART.h
..........\F34x_MSD_USB_Descriptor.c
..........\F34x_MSD_USB_Descriptor.h
..........\F34x_MSD_USB_ISR.c
..........\F34x_MSD_USB_Main.c
..........\F34x_MSD_USB_Main.h
..........\F34x_MSD_USB_Procedure.asm
..........\F34x_MSD_USB_Register.h
..........\F34x_MSD_USB_Std_Req.c
..........\F34x_MSD_Util.c
..........\F34x_MSD_Util.h
..........\F34x_MSD_VBUS_Functions.c
..........\F34x_MSD_VBUS_Functions.h
..........\Readme.txt
2.Schematic
...........\EE001-0002-USBMS.pdf
3.BOM
.....\EB001-0002-USBMS.pdf
.....\EB001-0002-USBMS.xls
4.PCB Files
...........\EA001-0002-USBMS.pdf
...........\EA001-0002-USBMS.zip

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