changes.txt

ATMEL公司AT89C51SND1为主控制器MP3源代码

CHANGES - snd1c-refd-nf-4_0_3


CHANGES
-------
## Version 4.0.3, September 28, 2003
 BUG FIX
- Fix not uptodate NF Driver for NF 1X_2KB and 2X_2KB in 4.0.2 package 

## Version 4.0.2, September 1, 2003
  BUG FIX
- Fix compatibility with MAC OS9
- Secure Nandflash recovery after USB detach

## Version 4.0.1, July 10, 2003
  NEW FEATURES
- MP3 file header recognition enhancement in case of bad header
  BUG FIX
- Past in parent directory when go to previous mp3 in mode play


## Version 4.0.0, May 16, 2003
- General memory task management
- General file system management
- General display management (LED/LCD)
- FAT optimization (code size)
- FAT format change
- Add of a function that give free space on disk
- Nf driver  optimization (code size)
- Reserved disk space feature
- USB Mass storage unplugged while load/download
- Fix Bug for MP3 over-consumption after power-up

## Version 3.2.1, March 18th, 2003

  BUG FIX
- Regression in file cluster chain creation in FAT12 (fat.c module)


## Version 3.2.0, March 17th, 2003
  NEW FEATURES
- Player can now play all files located in sub-directories
- Player can now start playing after power-up
- New Nand Flash drivers allowing NF size autodetection

  BUG FIX
- Bad writing at end-of_disk
- Sub-directory management
- file size to 0 after small file creation
- Mass Storage MAC OS9 support


## Version 3.0.0, December 20, 2002
  NEW FEATURES
- Dynamic write protect management
- Play consumption optimisation
- 44.1/320kbs now plays with workaround on latest chip
- Linux multidrive support

  BUG FIX
- SCSI support for all NF size
- NF Corruption after Win Delete & USB Unplug
- Sub directory management in fat module


## Version 2.9.95, October 25, 2002
improvement:
- new sbc/sbc-nf lib (write protect/busy flags)
- new software architecture

## Version 2.9.93, October 3, 2002
bugfix:
- voice mode IHM bug

## Version 2.9.92, September 20, 2002
bugfix:
- play mode after usb-download
- idle state after end of disk
- init song level

## Version 2.9.9, September 12, 2002
- Remove WorkAround and Special Software Bug Fix for AT89C51SND1A/B
- New USB (ping/pong mode)
=> These changes are dedicated to AT89C51SND1C
- New FAT
- New Voice mode (wav file update / create)
- No more MMC reference
- DAC in L3mode
- Bass Boost support

To improve audio quality at low sound level, the DAC sound level control may be used,
with UDA1330ATS compatible hardware. To use L3 mode of DAC with the reference design,
remove R1 resistor and change R10 to 0 ohm, pin APPSEL is now controlled by P4.6.
To activate/desactivate L3 mode DAC control (not compatible), recompile with or without
#define DAC_L3MODE in lib_demob/board.h


--
Other changes, regarding the demo DEMO_NF which the reference design is based on:
--
## Version 1.2.5, June 7, 2002
NEW FEATURES / ENHANCEMENT
- Mass storage now supports MAC OS9.
- Mass storage now supports multidrive on Win98(TM), WinXP(TM) and WinME(TM)
  Win2K(TM), MAC OS9 and Linus do not support multidrive.
- Mass storage library now reports 2 busy events:
  - sbc_wr_busy set when write command received
  - sbc_rd_busy set when read command received
  These events are cleared by the consumming task.
- USB plug-in detection enhanced to avoid spurious detection.
- NF no more need long start-up time.
BUG FIX
- MMC is still working when USB unplug is done after a file write.
- No more "crack" when playing back voice file.

## Version 1.2.4, April 26, 2002
- Mass storage now supports win98(TM) and Linux(TM).
- Mass storage library implementation eases new memory support.
- MMC plug/unplug now supported during mass storage.
- MMC automatically selected (if present) when entering mass storage.
- Win98(TM) driver available.

## Version 1.2.1, April 5, 2002
- Bug fix in NF drivers when reading a card above 32 Mbytes. 

## Version 1.2.0, March 28, 2002
- Support for generic USB mass storage drivers under windows 2K, ME, XP (TM)
- Compliant with Smartmedia implementation recommendations 
- Allow format of DataFlash and MMC through the tool operating mode
- Full support for voice operating mode
- Full support of AT89C51SND1B in case of MP3 errors

## Version 1.0.2, January 24, 2002
- Change Long File Name management in FAT
- Fix bug when accessing files on card size > 32 Mb
- Fix bug when mass storage read is performed just after a write
- On-board DataFlash bug fix in player MP3 read

## Version 1.0.0, December 21, 2001
- Creation