Problem with Magic Midi Delay

MIOS programming (Assembler)
1

Hello, usually I figure out the problem 5 minutes after I post, but here goes:

I built a Magic Midi Delay on my breadboard with 8 non-detented encoders and one detented encoders. The only code I changed is the pin assignments for the encoders. When I first turn it on, I get all kinds of jitter, with the screen going back and forth between the transpose and BPM menus. After about 30 seconds, the jitter stops and everything works perfect.

I have tested the encoders with the enc_3 test and they work great. Is there any other code I have to change?

In the Main.Asm file I have:

#define USE_POTS 0

So I shouldn’t have any problem with the AIN pins - correct? I have tried grounding RA0-3,5 and RE 0-2, but this doesn’t help. I have also tried the Midibox TC and it works fine too. Any ideas?

Thanks

Justin

2

Hi Justin,

open the “mmd_din.inc” file and write a return instruction below USER_DIN_NotifyToggle - this disables the buttons functions - does it help?

Best Regards, Thorsten.

3

No, this doesn’t help. Here is the only code I changed:

MIOS_ENC_PIN_TABLE
      ;; encoders 1-16
      ;;        SR  Pin  Mode
      ENC_ENTRY 1,  0,  MIOS_ENC_MODE_NON_DETENTED      ; V-Pot 1
      ENC_ENTRY 1,  2,  MIOS_ENC_MODE_NON_DETENTED      ; V-Pot 2
      ENC_ENTRY 1,  4,  MIOS_ENC_MODE_NON_DETENTED      ; V-Pot 3
      ENC_ENTRY 1,  6,  MIOS_ENC_MODE_NON_DETENTED      ; V-Pot 4
      ENC_ENTRY 2,  0,  MIOS_ENC_MODE_NON_DETENTED      ; V-Pot 5
      ENC_ENTRY 2,  2,  MIOS_ENC_MODE_NON_DETENTED      ; V-Pot 6
      ENC_ENTRY 2,  4,  MIOS_ENC_MODE_NON_DETENTED      ; V-Pot 7
      ENC_ENTRY 2,  6,  MIOS_ENC_MODE_NON_DETENTED      ; V-Pot 8

      ENC_ENTRY 3,  0,  MIOS_ENC_MODE_DETENTED      ; Jog-Wheel

Maybe I made a mistake?

Justin

4

The table should be ok, so I guess that either your modification hasn’t been assembled/uploaded correctly, or the DIN chain isn’t terminated.

To check the software: open “mmd_display.inc” and change some characters in TEXT_DLY_0, TEXT_TRANSP_0, TEXT_CHN_0, TEXT_CFG_0 — just to ensure that the modified code has been uploaded

To check the hardware: ensure that the SER input of the last 74HC165 is terminated with a 10k pull-up resistor.

You could also upload the ain64_din128_dout128 application to check if there are floating pins (open inputs)

Best Regards, Thorsten.

5

Thanks for your help Thorsten - you hit the nail on the head. I had some 1k resistors in place of the 10k’s. I guess I can’t trust my bag of 10k resistors from mouser. It doesn’t help that I am halfway color-blind either!

Thanks Again

Justin

6

Ok, that wasn’t the problem!

I switched to another DIN module, after testing all the resistors with my mutimeter, and it behaves the same.

I have tried the AIN64 program and it works fine.

I switched some of the text like you said and it shows up after assembling, converting and sysexing.

I’ll keep searching!

Justin