Solved! - Problems with uploading Mios8 into PIC18F4620

Testing/Troubleshooting
1

Hi,

 

something strange happens when i try to upload mios into the PIC.

First of all some infos.

Im using a Mac with OS x 10.7.5 , Midi-Interface AMT 8 emagic (and RME Hammerfall Multiface,) Mios 1.9g, Mios Studio 2.4.2 and an own designed PCB of a mb808 sequenzer (seq dr.)

 

The story:

I burned bootloader 1.2 with MBHP Burner on the pic. then i stick the Pic into the PCB an connected the MIDI cabels to the Midi-interface. I switched on Power and started 

Mios Studio. The display (16X2) on the PCB shows a line of squares in the upper row. Mios detects the Core and shows:

 

Operating Systems: Mios8

Board: MBHP_Core or similar

Core Family: PIC18F

Bootloader is up & running!

 

Then i choose the Mios hex file for PIC 18F4620 and start the upload.

after rebooting the Pic Mios Studio shows

 

Operating Systems: Mios8

Board: MBHP_Core or similar

Core Family: PIC18F

Application  is up & running!

 

Everythings seems to be fine, but the display of the Midibox still shows a line of squares in the upper row, no “copyright” an no “ready” strings appear.

 

If i try to uppload an application nothing happens. It’s like there is no Mios uploaded.

 

Is it Possible that Mios is running and the Display shows still this line of squares?

I checked all the voltages on the Pic and the Midi connections like described in the troubleshooting for about 5 times. I also replaced the pic (3 times) but the result is always the same.

I also took one Pic out of a real fine working Midibox ----> same problem.

 

Does anyone got an idea how i can solve this?

 

Thanks

 

Jamie

2

Ok, some new results:

 

I put the pic back in another core modul, switched the power on an to my suprise it starts mios and the application.

 

So there is no problem with the upload (what a nice result), but in the other pcb it seems that the pic won’t start mios or the application.

 

Does anyone got a clue what the possible reasons can avoid starting the application?

 

Thanks

 

jamie

3

Obviously if the PIC works in another core but not your mb808-sequencer core, then there’s a problem with your wiring somewhere.

 

Is your LCD is wired incorrectly?

Is your PSU delivering enough voltage?

4

Midibox Addict thanks for your hints.

 

I checked the PSU by connecting both (Core Modul and my own PCB) on it. PSU works fine.

But now i was able to compare the PIC one on one. So i started measuring the voltage on the PICs  Pin by PIn and found out,

that there were some shorts on my PCB. This was caused by some signalstripes that were too close together.

I fixed that by cutting this stripes an soldering some wires in.

So now the PCB and the PIC works fine.

THANK YOU!!