I sometimes check this blog in order to verify if there are some interesting news, without success, and then I realized that I am the only author of this blog (
), hence though I should write something here in order not to deceive my countless fans.
So, sorry for the lack of news recently, I was busy with Saturn things, but also in deciphering Christmas presents lists 
... and now busy in tidying up lego blocks and trashing used wrapping paper 
I hope you're spending nice Christmas vacations ! I'm a little late for wishing you a merry Christmas (
), and a little early to wish you an Happy New Year (
), hence the broken title 
So what's new with my Saturn projects ? In fact, nothing worth writing an article, but here is a short (and probably incomplete) list anyway :
1. SD Memory Cart : when overwriting save on Saturn side, keep the old save file on SD card (but remove it from saves list, of course).
Basically, it automatically keeps old saves somewhere on SD card, so that it is possible to revert to a previous state. I hope Saturn RPG fans will like
2. USB dev cart mode : when USB cable is detected, allow to unlock CD-ROM and then prompt for data upload.
This feature allows to makes tests on Saturn main program using data from CD-ROM without the need of installing a modchip, and without the need of burning a CD-R on each program changes
Special thanks to Shazz for reminding me to add such a feature, antime for wiring FTDI's PWREN signal to Saturn (it was unused for 3 years, but it was useful in order to detect USB connection, and hence hiding USB dev mode for normal users not using USB), and of course CyberWarriorX and jhl for Pseudo Saturn 
3. PCB changes : basically removing few debug "in case of" stuff, and also moving SD card socket in order to fit better with cartridge shell.
It is still WIP, but plan to send the updated gerber to the PCB house on next month.
4. Few changes to the sources of yabause I'm using for testing my projects.
Especially, I added position save/restore and keyboard shortcut to each debug dialogs ... long time I wanted to do this
5. In Backup Data Manager, some additions to "Import" feature : backup data dump file read and parse was done a while (4-5 months ?) ago, I just added something to select where (Internal Memory or Cartridge or Floppy) to save selected saves, and plan to port save data extract algorithm next month or so 
Thanks to hitomi2500's ss-save-parser project, such "Import" feature is easy to integrate in my Backup Data Manager project
Last but not least, I also want to thank Stac user on Assembler forums
He's doing good job in beta testing, and thanks to his reactivity and good communication, project is progressing faster than I was expecting.
Beta testing is far from being a funny job, especially with me as main programmer (), and when testing requires to play games (this requires time, and bugs on my Saturn project may lead to loose of progress in game), so once more, thank you
Read more Merry New Year !
Updated ... for around two hours, then reverted to previous version
Making a backup of whole devblog directory before trying version update was useful this time 
Details about why I reverted to previous version : I first wanted to try latest version in order to see if image upload is better than current one (sluggish HTTP POST upload 
).
So I download Pluxml latest version, and verify differences with current one installed in this blog (there are some modifications for captcha and extra smileys), merged everything, uploaded and ... article editor plugin (pxleditor) displays corrupted text when trying to modify an article
It's not that I can't do anything without article editor plugin, but ... I don't want to write articles in raw HTML (), and trying other editor plugin was only an half-success, because I prefer pxleditor simple interface (the simpler the better ).
Well, I don't give up, but that's enough web-related things for today this week this month ().
I don't know if I hate html/php, or if html/php hate me, or both, but what's sure is that I prefer Saturn programming
Next time I will try to update my blog, I will first try with xampp on my dev laptop ^^
Edit (2015/11/12) : at least I made one change to my blog : I added this smiley : 
This is the image from where I made the cow (not hippopotamus) logo that I put on all my personal projects
I found it in "pre 2007" archive folder in my laptop. Fortunately this old file wasn't lost
Edit (2015/11/16) : re-install from scratch, and local setting & testing with xampp did the job. However, "send email to cafe-alpha when comment is posted" feature seems to be broken, but I will investigate about this later 
Edit (2015/11/18) : email send feature is fixed, everything is working correctly, and blog's CMS is updated to its latest version
Edit (2016/01/14) : fixed article formatter in order to display images in a separate browser tab.
Read more Blog's CMS updated ...
I'm still developing the firmware for my custom cartridge, and it worked enough so that I could take a video of it running on real hardware
Click on the image in order to see its youtube video.
You can also click here in order to download .avi file.
Video may be blurry, so here are some additional pictures :
USB & SD card cartridge.
This is the cartridge I mainly use for testing on real hardware 
(USB port is used for debug purposes)
SD card cartridge for Saturn.
This is the version I plan to release in the case development continues well
And last but not least, many thanks to beta testers for their cooperation and patience
Beta cartridge loaded on modded Japanese Saturn.
Thanks to MeteK for beta testing and taking this picture
Last week, MeteK reported that basic SD card access worked on his Saturn 
Pseudo Saturn Kai System Information screen.
Thanks to Alexandre Souza from www.tabalabs.com.br
for beta testing and taking this picture
-
Additional pictures from Alexandre : cartridge without, then with shell.
Alexandre is currently trying to 3D print cartridge shells. Please do your best
I still can't getting things working on Alexandre side : SD card doesn't respond to SPI requests from Saturn via my cartridge ... I suppose this is due to a bad hardware design on cartridge side, but I still need to investigate about this ...Edit (2015/11/11) : it is fixed and verified here
Fortunately, it was not an hardware error, but a firmware (SH-2 side) error.
About details : I access SD card by using SPI protocol, and the reason some cards couldn't be initialized was due to the fact that commands were incorrectly received by SD card.
Sending a dummy synchronization byte before sending command to SD card fixed the problem.
Log taken from my dev Saturn : first half is SD card initialization sequence,
and second half is data blocks reading.
It works under custom build of yabause too
Thanks to this, most of the tests could be done on PC,
which saved a lot of development time.
Thank you yabause team After doing some testings on my side, I could verify that :
- SD card access works fine on all the 6 Saturns I own
- Some SD card can't be accessed via my cartridge, while the others work fine. (← fixed)
Saturns used for testing.
The one on the top of the picture is my good old dev unit
SD card that aren't recognized by my cartridge.
Edit (2015/11/11) : I fixed firmware and 32GB micro SD card above was recognized
(I didn't tested with the other SD cards, but I suppose it is now OK too.)
SD cards that were correctly recognized by my cartridge.
To conclude this article, I have to say than this project doesn't make exception to Muphy's Law :
Anything that can go wrong will go wrong
Beginning of year (2015) : Virtual Memory Cart related debug. After verifying that it has the chance to work, I temporary stop its development, mostly because I was bored to continue development of this feature ^^;
Until this summer : a lot of struggle with Pseudo Saturn 0.831/0.832/flasher/etc related things.
September : SD card library related troubles. Try to get a solution by using -and trying to fix- thinfat32 library. Using fat_io_lib was a better choice, thank you hitomi2500 for your advice about this library
October ～ Now : Troubles with SD card on Alexandre side ... will work if another SD card is used (currently waiting for test results) ?
Anything that can go wrong will go wrong
But at least, beta cartridge half works, so I can safely continue its development
I plan to release the first batch of cartridges with SD card included, so that there won't be incompatibility issues on user side.
As my project is a low cost one, and also because it won't load commercial games, I plan to sell the cartridges with low cost (8GB or maybe 16GB) SD cards.
Edit (2015/11/11) : SD card compatibility is likely to be fixed, and as far as possible I don't want to do SD card stock management/etc, I will probably release cartridges only.
There still no release date to announce, because some fixes/features addition/testing/etc is remaining, and also because I mostly do this for fun
Read more Firmware development - will it work somewhere else than in my dev Saturn ?
Good news : this month, I took my last chemo pills
Last chemo pills (white & orange capsules),
and medicine in order to cover chemo side effects.
Yes, I took a picture of my last chemo pills in order to celebrate this event
And even better news, the physician in charge of me told me that it should be OK not to continue chemo treatment
PET/CT results.
Basically, it says "both PET and CT didn't shown anything weird".
I'm so glad of theses results that I hesitate to frame this test report ^^
Of course, it doesn't means my cancer is completely cured - 5 years without cancer relapse are needed to say everything is OK -, but at least last month's PET/CT scan didn't shown anything, so this is comforting for the next few months ...
Here is a "one page" timeline of the treatment of my cancer (= stage 4 tongue cancer).
April 2014 :
Small mouth ulcer + pain in left ear : consult Otolaryngologist doctor.
On first consultation, I get medical prescription of mouthwash liquid.
No improvement after 2~3 weeks of treatment, so I return to Otolaryngologist doctor, and I was told that I should get "a test of my cells" (doctor didn't wanted to say "biopsy" keyword ...), so I receive a "letter of introduction " to a bigger hospital.
May 2014 (first half) :
Biopsy, one week after, I was told "you got cancer".
I ask the stage : "maybe second stage or so". I ask a "letter of introduction " to a even bigger hospital.
May 2014 (second half) :
First consultation to the "even bigger hospital" + PET, CT, etc tests. Cancer stage was diagnosed to 4a.
One week after first consultation, I am hospitalized during 10 days in order to receive intravenous chemo (5FU + Nedaplatin).
June 2014 :
Commute to hospital (twice a week) in order to follow up chemo side effects.
July~August 2014 :
Hospitalization for surgery (tongue resection, neck lymph node dissection, tongue reconstruction).
Around 9 hours for surgery, 7 weeks for hospitalization, it was really hell ...
October 2014 :
Start of oral chemo (TS-1).
Blood test every 3 weeks.
If everything is fine (= blood test don't show bad results), I take this chemo for a year.
Winter 2014~2015 :
PET scan show abscess in chin ... one week after PET results, it was visually visible.
Tried A LOT of antibiotics, none worked, so the physician who operated my tongue and neck manually removed meat around the abscess ... as a result, there is a small cavity on my chin, but at least abscess is cured
2015 (first half) :
Blood test every 6 weeks, plus CT scan every 3 months.
Basically, everything is fine
(I just skipped 2 weeks of TS-1, because of chemo side effect)
End of September 2015 :
Annual PET scan. Was nervous about results, but everything was fine
It's safe to stop TS-1, and next blood test is scheduled 3 months later.
It was a long time I go out from hospital without medical prescription sheet ^^;
October 2015 :
I take some few TS-1 capsules I skipped during 2015 first half.
Don't tell this to my doctor Normally I must trash chemo drug I couldn't take during prescription period, but it's really a waste IMHO.
Read more End of chemo :]
So as you may know, I'm (still) developing the hardware/firmware/everything else for my SD card-based Saturn Cartridge.
One the main module for the firmware of this cartridge is File System access library.
As you may know, there are many File System existing in real worls : FAT, NTFS, exFat, ReiserFs, etc.
And in my project, I choose to use FAT32 in order to access files and directories.
Why FAT32 ? Just because it offers the best rate of advantages vs disadvantages in my project scope.
Advantages :
- Available everywhere, from Windows 98 to every Linux distribution.
- Detailed (?) specs available on MS website, lots of free source code available elsewhere.
- Little resource requirement (at least 1~2KB of work RAM, and few tenths of program memory for code).
Disadvantages :
- A little hard to understand why internal data structure is so messy ... more understandable after reading FAT16 specs.
- Complex Long FileName support, and patented by MS too.
- Write performances may be poor under certain conditions. Example : fragmented file system + large partition size.
- Free source code available everywhere is sometimes buggy / bloated.
At the very beginning of the project (nearly 4 years ago !), I choose DharmaniTech FAT32 library , and it was easy to use, so that I could read files without many problems on software development side.
But it only supports <512 bytes file write, and a lot of advanced features weren't available, so I then switched to thinfat32 library .
Thinfat32 library was a pain to adapt to Saturn, and some advanced features weren't available, or didn't worked, so I rapidly switched to libfat .
Libfat is great, works without any major trouble, and even supports FAT16
So I kept libfat as FAT32 library for around 3 years.
But one problem of libfat is ... its weight (<- yeah, I wanted to put this pun somewhere ).
- Sector caching is cool, but library doesn't work without it, so we need at least 8KB of work RAM for it.
- Source code is very complete, but also very complex, so unless you aren't a talented developer, so can't customize it easily ... and unfortunately I'm not a talented developer 
- Library supports nearly everything for file/directory manipulation, so size after compilation is a little big (around 50KB IIRC).
You may ask : "why complaining about few KBs of RAM ? Saturn got plenty of RAM to use !"
Well, yes and no. My project (on game game backup from/to SD card) of resources :
- Work RAM : 24KB ... not contiguous : 16KB+8KB
- Program memory : work RAM, or cartridge ROM (1MB). I choose to run program directly from ROM.
And, in a (maybe) future hardware project, I may need to port FAT32 library to microcontroller, so few resources will be mandatory.
So last month, I dropped libfat, and started to look for a simpler & better FAT32 library.
When selecting a starting point for development, my choice pointed to thinfat32, not because it was perfect, but because I had some experience with it in the past, so that I know where I should start to fix things
First, I dropped some features I don't need :
- Long FileName when writing files : LFN can be read, but only 8.3 files can be written ... it's enough for my needs
- Long path : changed maximum size for file path from MAX_PATH (260 bytes) to 96 bytes ... it's enough for me, and saves some RAM.
- Only one file open at once : it saves some RAM.
- Other ? (don't remember)
Then started to fix/debug/etc the library :
- Big/low endian support ... Saturn and PC endianness is different 
- Directory creation fix.
- File creation in non-root directory fix.
- Added test bench under windows ... there was one stub in original sources, but with very limited test range ...
- Better log support.
- FS info support.
- FAT16 support ... not working yet (), but at least it works better than in original sources
- File append fix ... original sources support file append ... only in the case source file is multiple of 512 bytes ... this bug took me many time to spot
- Clock support when setting file timestamp ... original sources supported only fixed (dummy) timestamp.
- File listing within a directory.
- Source code cleanup.
- MANY fixes.
Complaints about thinfat32 library may look severe, but I really thanks its author to publicly release it !
Thanks to him, I know have something that fits my needs, and have a deeper knowledge regarding FAT32 structure
Last but not least, here are some screenshots :
Read more libfat : maybe you need to loose some weight :D
