Autonomous USB MIDI interface

[milk]

Hey, first of all thanks for this synthex. It's a wonderful project to try before doing megadrum.

I've just finished soldering my autonomous interface, wrote it with winpic and a serial cable and the 10k resistors, it verified the data, said everything was succesful. I was really happy =)

But now windows won't recognize the usb device. Any ideas what could have gone wrong?

I have used version 2 of the firmware. The ic never got hot or warm. It just seemed everything was ok.

cheers

[milk]

well, after reading a couple of topics I've followed suggestions and re-read the pic memory, it gave me only zeroes... so I guess there was something wrong recording... can't figure out what though.

[Synthex]

Hey, first of all thanks for this synthex. It's a wonderful project to try before doing megadrum.

Thanks a lot

I've just finished soldering my autonomous interface, wrote it with winpic and a serial cable and the 10k resistors, it verified the data, said everything was succesful. I was really happy =)

But now windows won't recognize the usb device. Any ideas what could have gone wrong?

I have used version 2 of the firmware. The ic never got hot or warm. It just seemed everything was ok.

cheers

Have you tried it with another computer ?

[milk]

Hey!

well, I couldn't find any other pc with serial port to test it with...

I tested my ICSP cable and found one of the cables was busted, i replaced that, and now instead of getting all 0's when I read the chip I get all F's... Still can't record, it just records (apparently) all F's

I'm asking my friends to see if someone has a pc with serial port, but it seems everyone is on a laptop nowadays...

I tried reading the 26-27-28 pins with a tester and found that checking or unchecking the vpp, etc. options did not change the readings and they where 0.27, 0.01, 0.01 respectively (testing with ground on what is connected to pin 8 (which I guess is ground)
I also found that my usb is giving 4.79v instead of 5v maybe that's a problem?
maybe my tester is too cheap...

if you have an idea why I would get all F's tell me please, otherwise I'll post as soon as I get another computer to try and program.

Cheers,

[Synthex]

What is your operating system ?

I also found that my usb is giving 4.79v instead of 5v maybe that's a problem?

No, that's not a problem.

[milk]

That computer is windows xp sp2, I also have a mac and a linux box (neither of them have serial ports)

I am programming with winpic...

[milk]

o, I was confusing the pinouts

here are my readings:

VPP on/off pin 26: 5.00/-0.66
Clock on/off pin 27: 4.49/-0.60
Data on/off pin 28: 0.18/0.12 and then later 0.20/0.28

maybe there's something wrong with pin 28?

edit 1: pin 28 reads 3.78/-0.6 now, guess it was a false contact before

[milk]

pin 20 has 3.76 when not programming and drops to 1.78 while programming

[Synthex]

Could you make a test with WinPic800 ?

Have you seen this topic :
http://www.megadrum.info/forums/viewtopic.php?f=3&t=119&st=0&sk=t&sd=a&hilit=18f2550&start=40#p1473

Where do you live ?

[milk]

Could you make a test with WinPic800 ?

I just did that, I still get all F's (I checked the fuse flags and are equal to yours)

Have you seen this topic :
http://www.megadrum.info/forums/viewtopic.php?f=3&t=119&st=0&sk=t&sd=a&hilit=18f2550&start=40#p1473

yes, I've been reading it, I'll try downloading mplab next, then another pc, and then I'll try making a new lvp programmer with a different cable, and if that doesn't work I'll see if I can get another pic.

Where do you live ?

Buenos Aires, Argentina!
you are from France, right?