core midiout problem

Testing/Troubleshooting
1

I just built the core module.

I checked all the voltages I can.

I mounted the pic18f4685 (programmed with the bootstrap loader with picpgm) and the 6n138 in their sockets.

I have connected an LCD 16x2 to the core.

I can see the first row light and the second row dark.

If I check with the midi in monitor in mios studio i have no midi messages. (the problem is not my pc because i can read any other midi instrument.)

If I test the voltage of the tx pin of the pic I can read 3.66V if I reset the core module sometimes I get 4.98V. while my rx pin it’s always at 4.98V.

If i connect a led to my midi out it never turn on!

I have tried to follow the midi troubleshooting but without success

What’s wrong?  ???

please help me!

2

Did you try another optocoupler? Most of the times its the opto.

3

no. I haven’t another one I have to buy it.

Do you think I have cooked my optocoupler?

Is it so easy to burn?

4

DenDer: You do realize the opto is hooked up to the MIDI In, right? So, your answer is, um, kinda pointless ::slight_smile:

Dondo: Try running all the MIDI Troubleshooting tests as described on ucapps.de. Then post the results here :slight_smile:

5

Damn…didn’t realize that stupid stupid :-X

@ Dondo, did you burn the pic yourself with the bootstraploader?

6

dondo and dender … eheh  ::slight_smile:

7

Yes! I burn it myself!

I burned it in gentoo linux system with the last wine because on xp I always have problems to use my programmer!

It worked i think! the verify was successful.

I did it with picpgm.

8

This is my experience with the midi troubleshooting page

 

  *  TEST PROG1: my pic is burned sucessfully

    * TEST CORE1: I have the A10.000 FD3u4 crystal on my board

    * TEST CORE3: there aren’t missed junctions or bad solderings

    * TEST CORE4: I have 4.98V in all the Vdds (except fot TX pin of the pic that oscillate from 3.66V to 4.98V)

    * TEST CORE5: I have 4.98V in all the grounds

    * TEST CORE6: The polarity of my MIDI plugs is OK

    * TEST CORE7: The polarity of the protection diode D1 is correct

    * TEST CORE8: My R8 and R7 are 220 Ohm 5% tollerance

    * TEST CORE9: The midi out of my core is connected to the midi in of my Edirol UM-2 midi device

    * TEST CORE10: I would like to have a lot of request messages connecting TX pin to RX pin, but I have nothing

    * TEST CORE11: I would like to have at least wrong sysex messages, but I have nothing

    * TEST OUT1: If I connect a LED to my MIDI Out port sometimes it turn on for 2 seconds (strange just sometimes)

    * TEST OUT2: I have tried to disconnect the middle pin of J12 (ground line of MIDI Out port) but without results

What’s wrong guys?  :-\

9

What’s wrong guys?  Undecided

  * TEST CORE5: I have 4.98V in all the grounds

does it really need explanation..

assuming is the mother of all evil

  * TEST CORE3: there aren’t missed junctions or bad solderings

10

does it really need explanation..

assuming is the mother of all evil

I mean making this test ( http://www.ucapps.de/howtodebug/mbhp_core_extract_measuring_gnd.gif ) I got 4.98V in every ground point

11

I mean making this test ( http://www.ucapps.de/howtodebug/mbhp_core_extract_measuring_gnd.gif ) I got 4.98V in every ground point

ok sorry, as i ve stated before assuming is evil..

..reading back you don t mention trying to upload MIOS or applications , what about that..

EDIT you may drop by the chat right now for faster troubleshooting

12

Nothing can be uploaded into my core module…

there is no way…

I have tried with mios in 3 ways

  1. waiting for an upload request (that never arrive)

  2. smart mode without results

  3. manual mode (with this one i get upload succeded but i don’t see changes neither to the display)

13

hi

if no hardware problem can be found i suspect that the bsl hasn t been correctly burned.

i can t think of anything else

simone

14

>Nothing can be uploaded into my core module…

>there is no way…

>I have tried with mios in 3 ways

>1) waiting for an upload request (that never arrive)

>2) smart mode without results

>3) manual mode (with this one i get upload succeded but i don’t see changes neither to the display)

Manual mode will always succeed, because it’s not checking to see if it got there.

>I can see the first row light and the second row dark.

That means nothing is talking to the display.

You probably need to burn the bootloader into the PIC again. It does not appear to be running

Your power readings look good, I assume your 7805 is not burning hot. If your crystal is OK, then

you are down to a blank PIC or a bad PIC. PIC’s are usually pretty tough.

But I’m just guessing.

Good Luck,

LyleHaze

15

Don’t assume

Never rule out bad soldering/joints

Reburn the PIC (make sure to have your programmer read/compare it after burning)

Cimo: Awwww, she is soooo cute. When can I marry her?

16

Cimo: Awwww, she is soooo cute. When can I marry her?

25 camels

17

Deal. That means I’ll have to sell my mom, but hey. Although they actually offered 30 camels and 20 goats for her in Tunis. What will I do with all those goats…

18

UPDATE: on another board I fixed a bad solder, and now the optocoupler test is OK. I was able to load MIOS (the upload request was being sent prior to loading it), but when I restarted the core nothing happened, and the display still shown the 2nd row dark.

what’s wrong now?

19

something loose in cockpit