help with core?

Testing/Troubleshooting
1

I am using a PIC18f452I/P with bootstrap loader v1.1

 verified.

when i turn on the core the lcd backlight comes on but it doesn’t send the sysex request for mios.Nothing displayed on lcd, but if i turn contrast up I get black boxes. I need to know what to do to get mios loaded.

2

When the bootstrap is only loaded you will see the black squares on your LCD.

Do this first

1.)You need to verify the bootstrap loader is burned right.

2.)You need to check your wiring on the midi circuit.

3.)Test your midi ports by attaching the input to the  

   output and use send/receive sysex for transfer. When

   finished go to the sysex view and compare the two

   windows. If they match you are fine with the computer.

Then if it doesn’t work ask me again and I’ll help you through it.

-Sephult

3

Is it the bootstrap loader v1_1b?

I heard something about the last version not starting up.

4

yes it is v.1.1b.

thank you I will check my wiring as you said.

can you point me to a fix for the v_1.1b not starting?

5

It should come up. No idea why it should not. :-/

6

Yeah v1_1b does work. There is no need for a fix.

I have only heard of problems with v1_1 of the bootstrap loader.

Have you checked your voltage levels? Make sure you have a stable 5v, with all pin connections verified as being hooked up correctly. If that doesn’t work, there might be a problem in the midi end. I would initially disconnect the LCD screen from the board until you have found the problem. I have found this to be very helpful :slight_smile: when doing troubleshooting.

I have just had a dilemma with a constant reboot problem, and Thorsten had directed me to disconnect D7 and the 5v at pin 2 (contrast connection). It corrected my problem.

I would say for the sake of troubleshooting to do so, to make shure that nothing is shorting out through the LCD connections.

There is only a small amount of things it could be.

1.) Power requirements not stable

2.) Midi circuit is failing

3.) Either the LCD or I/O connections are shorted.

You could also pull up/down I/O’s, and minimalize the circuit, to make sure there’s not a short.  

What settings are you using in MIDI-OX (if thats what your using)?  

Well thats about all the advice I can give today!

-Good Luck-

-Sephult

7

sephult thanks for your help I have since found the problem to be in the jdm programmer.

8

Awesome-

At least it didn’t take much time, I was thinking it was the burn also.

Have fun!

:wink:

-Sephult