Training SM350 Modules and Code Swapping By: Robert Abutan

Agenda 8051 HW restriction Modules Swapping limitation Code swapping

Cello 8051 HW Restriction Only 64 Kbytes Program Memory: –32 Kbytes ROM –32 Kbytes RAM SM350 needs to support: –Codec Initialization –Display & Drawing –User Interface –Audio –Recording –USB –Etc…

Modules Can be categorized into 4 basic main modules: –External ROM module (optional) –Initial module –User Interface module –Functional modules (Audio, Record, etc…)

External ROM System Diagnostic Firmware: –Test programs (SDRAM, Display, DSP, etc…) –Debugger For more information you can check on the SM350 System External ROM specification.

Initial Module Function: –Initialize HW (Codec, display, etc…). –Initialize SW (Global variable, etc…). –Recache Fat. –Load Resource files to SDRAM. –Load Binary files to SDRAM. –Logo (animation). Available space: up to 32 Kbytes (Currently only use 24 Kbytes).

User Interface Module Function: –Manage User Interface State Machine. –Manage Menu. –Responsible for drawing. –Manage Key. –Manage calling corresponding module Available space: 16 Kbytes. Our code > 16 Kbytes  Common + Banks.

Functional modules Function: –Manage each individual supported feature. Limited space: 16 Kbytes. Our code > 16 Kbytes  Common + Banks. Available functional modules: –Audio Module (Audio, JPEG, Slide Show, Ebook, and Movie); –Record Module (FM Radio and Recording); –USB Module; –USBDRM Module; –Recache Module; –Manager Module.

Audio Module Function: –Play Audio (MP3 / WMA). –Show JPEG (or Slide Show). –Manage EBook. –Manage MJPEG (Movie). –Manage Audio Playlist. –Manage browsing

Record Module Function: –Setup FM Radio. –Setup Recording (MIC or Line in). –File Write for Record.

USB Module Function: –Manage SCSI Command from PC

USBDRM Module Function: –Manage MTP. –Manage DRM download.

Manager Module Function: –Format media. –Detect media. –Manage File related functions, such as copy file, delete file, create directory, etc…

Recache Module Function: –Recache FAT –Reload any necessary files (WMA Table, Bitmap, Font, etc…)

Swapping Limitation Our swapping code is located at the RAM. Disadvantage: –Cannot swap a portion of software in the same RAM location without using swapping function from different RAM.

Code Swapping 2 Important functions: –Code loading from SDRAM to 8051 Program SRAM (8051Swap.c). –Interbank swapping (L51_MODBANK.A51 and L51_UIBANK.A51).

DMA Restriction (Code loading) 4 bytes alignment both on the SRAM and/or SDRAM due to hardware restriction. Only the first 10 Kbytes (0x0000 ~ 0x27FF) of the Data SRAM can be used. For some media (excluding HDD), DMA transfer xdata is restricted to starting address that its last 10 bits are zero.

Code Swapping Diagram

Swapping code UI extrncode(MainEntry) extrncode(ModBankSwapEntry) CSEGAT08000H LJMPMainEntry LJMPModBankSwapEntry END Module extrncode(MainEntry) extrncode(_UIBankSwapEntry) CSEGAT0C000H LJMPMainEntry LJMP_UIBankSwapEntry END

Data RAM For more information: SysBoot. inc

Summary SM350 Software Modules Code Swapping External Data RAM

Questions ???