whenever i start a project i like to keep a list of ideas, thoughts, srceen-caps and todo lists in one place
for midi control of panasonic video mixers
promicro setup : https://learn.sparkfun.com/tutorials/pro-micro--fio-v3-hookup-guide/all
.... some links here, explaining ...
- take midi in (see different ways below)
- send serial out (for ave55)
- convert to r232 with max232 chip
- connect to 3.5 trs jack
https://arduinodiy.wordpress.com/2012/03/19/serial-connection-for-your-arduino-atmega
wiring max232n :
usb midi from a host ie computer, pi etc, this should be the easiest to implement
from din midi devices - for this would have to have 2 serial ports, one listening to midi in, and one writing to ave55 out, i thin k the best thing to try is midi on the hardware serial and ave55 on AltSoftSerial , altSoftSerial on pro micro is missing the input pin , but it seems this can be modded in without too much trouble : https://forum.arduino.cc/index.php?topic=339587.0
from things like nano control - needs a host shield - maybe like this one :
reading midi from host and outputting as serial : https://github.com/felis/USB_Host_Shield_2.0/blob/master/examples/USBH_MIDI/USB_MIDI_converter/USB_MIDI_converter.ino question about mini-host and pro-micro : felis/USB_Host_Shield_2.0#392 an old thread talking about hooking these up together : https://forum.sparkfun.com/viewtopic.php?t=34873 another thread about hooking these up: https://forum.pjrc.com/threads/43357-Teensy-with-mini-USB-host-shield-(chineese)
-
it seems that the vbus (5v) needs to be cut from the vcc (3.3v) , here is best example : https://www.arduino.cn/thread-81435-1-1.html
-
i need a 3.3v power source for the usb-host , prob best bet is a L78L33 (18c, up to 100ma) or LM1117T (99c up to 800ma)
-
for the wiring , in theroy a level-shifter should be used between 5v arduino and 3.3v ic (74HC125) , but people have reported success with a arduio nano , which is also 5v so im thinking maybe this will also just work ?? but other places suggest it wont ,, im not sure - should try this circuit with a 3.3board too ?
-
also a 100uF cap in line with the power is reccomended here : https://www.pjrc.com/teensy/td_libs_USBHostShield.html
-
for the wiring , it should look something like this :
| host | pro-micro | name |
|---|---|---|
| 5 | ? | ss |
| 6 | 16 | mosi |
| 7 | 14 | miso |
| 8 | 15 | sck |
| 2 | ? | int |
| 1 | vcc | 5v |
| 9 | regulator | 3.3v |
| 3 | gnd | gnd |
| 4 | rst | rst |
- also suggested to wire rst to power ...
some more useful info about the host :
- https://www.hackster.io/139994/plug-any-usb-device-on-an-esp8266-e0ca8a
- https://web.archive.org/web/20190120133645/https://www.circuitsathome.com/usb-host-shield-hardware-manual/
-
panasonic ave55 is rs232 on a stereo 3.5mm jack
-
mx50 has a rs232 / rs422 switch , the interface is a 9pin dsub (with a bunch of confusing swtiches / settings)
-
mx30 has 9pin dbus with rs232
-
mx20 has serial on a mini-din , it says rs422 - hard to tell if it will work or how to make it ... mx70 has 9pin dsub with rs232 also
-
others ??
a list of mappings between serial commands and midi notes/ccscontinuous controls -> cc values (ie mix position...)buttons -> notes or cc (sources, )switches (toggles) -> single note/cc (ie pressing once for on, again for off ?)range of values (steps) -> cc values (ie paint0, paint1, paint2, paint3)
- try with the level-shifter circuit - i tried but it didnt work - maybe my circuit was wrong tho
try with smaller capsthis works horraytry with altSoftSerial- seems to worktry with serial midi input (how?) maybe i will need to work with 2 arduinos , one for sending midi another for receivingtry with usb midi host sheild- implement other types of commands (random / osolatoer etc .. )
- create a pcb design
the other panasonic mixers i know about have a different way of inputing serial... dont even know if this is compatable or works in the same way..
crazy that even these two arnt wired the same way ! but maybe only the (tx/rx/gnd matter anyway...)
dif plug, (mini din) and i think dif wiring too - looks like , oof it makes no sense ! (no mention of buad rate or stop byte or anything really on this one) , maybe not possible to support this one ...
it is known that the sparkfun promicro can from time to time get into a state where the port is not recognised, or difficult to upload new code to it - there is a complicated method of grounding the reset pin some times and then quickly uploading new code - i have tried this and though it works sometimes , it also is very frustrating and can just become a problem again the next time you try to upload some code.
instead i am going to explore the method of reburning the bootloader on the pro-micro, hopefully this will fix the problem more permanently. and after the intial time taken to learn how to do this, it will also save time working on this project, and any others with pro-micros. as a side note - this could also be useful for burning/uploading code to the dip-atmega ics you can get for $2 from tayda...
this sparkfun article is a good introduction to the idea.
i dont have an uno, but do have an arduino nano here - so will try using this as the ISP. sounds like even another pro-micro will work as ISP according to this forum post, but they have caused enough trouble for now !
first i uploaded the ArduinoISP sketch to the nano (using the old bootloader version) , then hooked them together with some wires:
the connections were: with spi->spi (miso, mosi, clk), and ss -> rst, plus power/gnd ; exactly the same as in this guide https://www.instructables.com/id/Burn-Bootloader-Arduino-Nano-As-ISP-to-Pro-Micro/ ; also i put a 10uf cap reset -> +| |- ->gnd on the nano
then in the arduino ide i chose the pro-micro board, changed the programmer to arduino as ISP then pressed BurnBootloader. this worked no problem ! very painless. at first i followed the intructable above and loaded with the arduino Micro board selected, but this did weird things with the leds , and although it still worked, after trying with my other 'not working' pro-micro , this newly updated one also started having problems.. i then went back and reburnt the bootloader , now with sparkfun pro-micro board selected - this fixed the weird led thing.
even with the pro-micro burnt, if i try upload code with the problem board, then swich the cables to a fresh and working one (even with a reset of vscode between) it will pass on the problem to this fresh board. luckly reburning the bootloader is very quick if you have the nano set up and ready to go. i will keep this ISP nano handy on the breadboard while developing on the pro-micro in case this problem starts again.