Search found 18 matches

by john101
Thu Apr 10, 2014 3:27 am
Forum: New to Uzebox? Start here!
Topic: a tutorial to understand kernal ?
Replies: 2
Views: 2059

Re: a tutorial to understand kernal ?

Indeed I found http://lucidscience.com/pro-vga%20video%20generator-1.aspx from your post discussing about RGB interface.I have already read the uzebox-how-it-works a week ago. A typical tutorial I think should include every units of UzeBox,each unit only about one part of the technical UzeBox used, ...
by john101
Mon Apr 07, 2014 8:47 am
Forum: New to Uzebox? Start here!
Topic: a tutorial to understand kernal ?
Replies: 2
Views: 2059

a tutorial to understand kernal ?

There are some tutorial about making game for Uzebox.Maybe there should be some tutorials about to understand its kernal. After I sold it, it works well now. But there is no simple tutorials to understand kernal. I mean some tutorial include a detailed guide to study it , one could also improve the ...
by john101
Sat Mar 29, 2014 4:10 am
Forum: New to Uzebox? Start here!
Topic: Now my ISP works, but no video signal
Replies: 11
Views: 5989

Re: Now my ISP works, but no video signal

After reworking the solder, 99.9% of the time it solves the problem and video comes back. Thanks, UZE6666, it works! After check it again, and resold some pin, everything is OK! I just start to learn sold (when as a university student,I do not think it is important :( ) , cold sold is hard to check...
by john101
Thu Mar 27, 2014 9:51 am
Forum: New to Uzebox? Start here!
Topic: Now my ISP works, but no video signal
Replies: 11
Views: 5989

Re: Now my ISP works, but no video signal

Today, I have free time, So I continue to do some experiment to find the problem. -What signals do you have on PORTC pins (the video DAC)? On the AD725 validate all signals there: -What signals do you have on pin 6 (RIN), 7 (GIN) & 8 (BIN)? -VCC on pins 1,4,14,15,16 -GND on pins 2,13 -14.31818 MhZ o...
by john101
Sun Mar 23, 2014 10:42 am
Forum: New to Uzebox? Start here!
Topic: Now my ISP works, but no video signal
Replies: 11
Views: 5989

Re: Now my ISP works, but no video signal

Dear Sir: After 2 hours working, only got little improvement. I programmed the boot loader( http://uzebox.org/forums/viewtopic.php?p=3847#p3847 ), and find signal on pin 1 and 4 (Atmel644) clear with right frequency. 14M.jpg This signal is about 14M, video clk 15-7K.jpg This signal is 15.7k, Video s...
by john101
Sun Mar 23, 2014 4:56 am
Forum: New to Uzebox? Start here!
Topic: Now my ISP works, but no video signal
Replies: 11
Views: 5989

Re: Now my ISP works, but no video signal

Dear uze6666: I do exactly as you suggested. The dead program is adapted from http://www.elec.uow.edu.au/avr/guides/Getting-started-C-programming-Atmel-Studio-6.pdf #include <avr/io.h> #include <util/delay.h> #define F_CPU 8000000UL int main(void){ unsigned char i; // temporary variable DDRB = 0xFF;...
by john101
Sat Mar 22, 2014 3:41 am
Forum: New to Uzebox? Start here!
Topic: Now my ISP works, but no video signal
Replies: 11
Views: 5989

Re: Now my ISP works, but no video signal

This morning, I still want to make my Uzebox work. It seems the ISP works well, so I guess the Atmel644 is working. Maybe it is the fuse bit is wrong? Because the command avrdude -c usbasp -p m644 -B 4 -U flash:w:Megatris.hex -U efuse:w:0xFE:m -U hfuse:w:0xD2:m -U lfuse:w:0xFF:m is just copied from ...
by john101
Fri Mar 21, 2014 3:59 am
Forum: New to Uzebox? Start here!
Topic: Now my ISP works, but no video signal
Replies: 11
Views: 5989

Now my ISP works, but no video signal

Several days age, I found my UZEbox "ISP" can not down program. http://uzebox.org/forums/viewtopic.php?f=8&t=2044 Yesterday I bought a new ATMEL16 ( no ATMEL644 sold nearby in DIP form) , it can be programmed through my AVRASP programmer in a minimal circuit. So my avrasp works well. (I doubt it won...
by john101
Mon Mar 17, 2014 9:52 am
Forum: New to Uzebox? Start here!
Topic: Why my ISP dose not work?
Replies: 7
Views: 4953

Some test about ISP and why it does not work

Thank you very much for kind reply. After 2 hours learning ISP, I know some basic knowledge about it. new ATMEL644 and ATMEL644 from the kits is different, new ATMEL644 can be "ISP" using the minimum circuit,(MOSI, RST,SCK, MISO, and VCC, GND linked with 644 corresponding pin , maybe AVCC?) but ATME...
by john101
Sun Mar 16, 2014 4:20 am
Forum: New to Uzebox? Start here!
Topic: Why my ISP dose not work?
Replies: 7
Views: 4953

Re: Why my ISP dose not work?

(1) Thank you very much: What kit did you buy? Is your atmega644 already programmed or is blank? My kit is like this: Board.jpg I do not know if it is blank, but it should be programmed of "game loader". I dare not sold the smd AD725 directly, so I sold a pegboard first. Not visible in the photo cer...