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Thanks!

I am sure its right, but i just want to double check this before i get boards made. in the schematic for the midi in optocoupler suggestion - https://www.pjrc.com/teensy/td_libs_MIDI.html We are powering the optocoupler with 5v and sending the output to a t4.1 input pin. Is VCC pin 8 5v...

I have been working on a website for the machine. If you want to learn more about my machine and its capabilities, visit The Monk Project

I have spent a lot of time working on an Electron App to help use the Machine. A few days ago, I decided to record a session of me playing the Machine. This was recorded directly to DAW. This video demonstrates the music from the "fugue" model and the "tic-tac-toe" model. I am playing a small...

A quick video to show some more progress. I have been building a companion app. The screen real estate has opened things up. While the machine is fully self contained, there are some cool things I can do with a bigger screen, a database and some API stuff. This demo might look like it is using...

new video featuring the machine:

Off the top of my head, how about where the tiny d+ and d- pads are? change them to holes. I know this is a bit of a quick suggestion, and would required removal of the socket to work properly, but if there was a film of insulation over the USB socket it would be isolated from these holes and...

on the subject of USB, please can we have proper pins to break out d+ and d-

Paul, thanks for your input. I have been further mulling this and can see that declaring the memory for the maximum is the way forward. This leads me to another question though: I'm potentially adding a further 196 pixels to 375 - new total of 571 pixels. the extra pixels do not need to be...

Yes, that is currently going to be my approach, but I am interested to see if there are other ways.

I want to be able to set the number of leds in my UX. I am adding neopixels to a MIDI controller keyboard. I have a 25 key mini keyboard, but I want to support up to 88 keys. At present, I set memory as suggested in the examples: const int numled PROGMEM = 425;//375...

I just read this article: https://www.tomshardware.com/pc-components/cpus/startup-claims-it-can-boost-any-processors-performance-by-100x-flow-computing-introduces-its-cpu-20-paradigm A 60ghz t4.1 anyone?

This is kind of my approach so far. I have some upgrade methods if I ever need to retain the SD data. I can take care of the naming within the code, the SD files are already named based on their counterpart struct, albeit with a 3-letter code. I like the idea of adding a version number to the...

Yes, I'm aware of the issues with changing the structures. I have gone with this because I need it to be as fast as possible. I had experimented with JSON but there was too much overhead and it became unworkable due to the real-time nature of this project (music sequencer). CSV would have...

well, that seems to have found it! here is the intialised SD data: and having reworked the values:

here is my struct definition: struct DrummerConfig { uint8_t channel; uint8_t screenMode; uint8_t midiOutChannel; uint8_t midiInChannel; uint8_t stepLength; uint8_t kitId; uint8_t currentPatternId; char kitName[CHANNEL_NAME_LENGTH]; int kitColors[4]; int selKitColorHit; int...

hmmmm.... if i place this at the end of setup(): drummer.config.enableFills = false; saveHandlerToSD(SD_TYPE_CONFIG, 0); it works, even with the SD card present.

at startup, yes. I am studying the data now.....

I have this section of code, please don't ask for the full codebase, its enormous. if (checkButtonPress(BUTTON_DRUMMER_FILLS_ENABLE)) // this works fine { Serial.println(F("Button press detected: BUTTON_DRUMMER_FILLS_ENABLE")); // Debug before...

@PaulStoffregen upgraded to 1.59. the problem persists but I noticed it only happens when certain devices are attached via USB. I have a simple 4 port hub attached to the t4.1 usb host port. During my development over the past year or so I have had an alesis v25 keyboard attached and this has...

Hi @PaulStoffregen I will give the beta 1.59 a go. I should clarify that the hang usually happens after a few attempts to send midi over the USB host. My program is huge, and im not going to publish it anytime soon, however I suspect my problems might be low memory: Memory Usage on Teensy 4.1...

which library are you now using? I am having similar problems with usb midi over usb host. recieves fine, but as soon as any midi is sent it hangs. It doesnt reset so i am thinking its stuck in a loop.

yeah, i think that is probably right.

Close serial monitor and it starts writing to the sketch again, with the hello world text prefixing the counter.

Finally got a port in arduino and serial monitor to open. Now I see the numbers and it’s no longer writing to the sketch.

Ah well it gets even weirder. The teensy is outputting this hello world message with the counter. Must be the blink sketch? But it’s writing code directly into arduino sketch file at the cursor position.

Odd . Every time I plug this other teensy in I get this hello world text appears in the ide in my code at the cursor position. The integer increases each time. Still can’t see it as a port, but teensyduino responds to a button press on tge 4.1. I try to use putty to check serial and get a pop up...

So I’m compiling and uploaded to my t4.1. Everything goes weird. The teensy does not boot. I can no longer see it as a port in arduino. I check the pc, leads to a restart. Get a blue screen. Finally manage to get the pc back up. Open up arduino and again I cannot see the teensy as a port. I had...

yes! we got there. So I learnt something new today. #pragma..... Thank you everyone who answered. i will post up my fixed example for reference later.

i will admit i am a bit lost here. Can you give examples of how to use this. This is what i did before: struct __packed BMPFileHeader { uint16_t fileType; // "BM" for Bitmap uint32_t fileSize...

here is an update to my sketch. Lots more control via the serial monitor. press h enter for help. All seems to function right, but these BMPs just wont load on my pc.. /* a test script to generate an image, dump it to serial and save / open from SD. script will generate a random color...

zip file containing some generated BMP files.

I have updated the struct, is this right? // Create BMP File Header struct __packed BMPFileHeader { uint16_t fileType; // "BM" for Bitmap uint32_t fileSize...

Hi, im trying to save an array of pixel as a BMP. i have this sketch running, but whenever i try to open the generated BMP in paint it reports the file format is not correct. I have been over this for too long now and need some fresh eyes. anyone here with more knowledge of the BMP format? Here...

well I have been checking over everything and this is now working fine. Many thanks everyone especially @kd5rxt-mark @PaulS and of course @PaulStoffregen TL;DR: the fix is to use the timed loop before you attach interrupt handlers, and do this at the end of setup: setup() { // run setup code...

updated to include multi chunk handling

fixed it. here is the working sketch if it is of interest: /* MONK 14112023 test script to debug sysex data exchange for commands and data dumps testing working with midi 2.0 manufacturer ids issue with 8 bit values defined send sysex example user the serial monitor to...

been on this for too long and i have gone cross-eyed! Late so off to bed. if anyone fancies taking a look please feel free. It will be a useful script for anyone wanting to send and receive raw data from structs over sysex. There is lots of checking and points to identify the data. the issue is...

I would suggest you use 0.9 inch i2c OLED displays as these are perfect for your task. You want multiple displays, so best thing is to get that workig first. Take a look a this tutorial: https://dronebotworkshop.com/multiple-i2c-bus/ once you have that working, you now want to develop your...

phew i got it back... hate it when that happens 🤦‍♂️

I had an idea to test this: (!!DONT TRY THIS!!) in setup use setup() { // Disable USB interrupts temporarily noInterrupts(); /* rest of the setup code */ interrupts(); // Enable USB interrupts } This had the effect of making my teensy un recognisble! Im trying to get it back now using the...

Paul, Yes I have noticed this too. The clock is being generated by a PC with the obvious overheads of a huge OS. In the music world we know that a computer does not provide a rock solid clock, and products exist to address this. One of my pending projects is to offer a stable midi clock. In the...

OK. So In summary: It would seem the process of using midi with interrupts must hand off all received messages to the relevant interrupt handler. Whatever library is dealing with this takes all messages buffered in the midi library, and takes over. This is why without the midi.read() loop...

ok, i tried using while (usbMIDI.read()) {};, no good. The idea of using a timer to force the read seems to do the job. but as you can see I have placed it in setup before we attach interupts right at the end of setup() #include <MIDI.h> unsigned long currentRXtime; unsigned long...

Bingo! it works! updated test sketch coming...

yes, I have stripped out in an effort to simplify and retain the fix. This is what i have so far - excludes the serial and host midi stuff. includes my drum generator. //#include <USBHost_t36.h> #include <MIDI.h> //USBHost thisUSB; //USBHub hub1(thisUSB); //MIDIDevice_BigBuffer...

wow. (wasn't the exact phrase i used. :) ) OK, so I had to add a few bits just to help me track it.... and yes you are right, it seems to fix the issue. #include <USBHost_t36.h> #include <MIDI.h> USBHost thisUSB; USBHub hub1(thisUSB); MIDIDevice_BigBuffer usbhostMIDI(thisUSB)...

Mark, are you connecting using midi USB host or USB client? there may be a difference here that could give us the clue we need to track this down.

OK, so I think we can agree that usbMIDI.read() is not affecting the clock. I am taking a leap here and going with the notion it does not effect any realtime messages.