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Interesting. My project is also configured for O2 optimization

Is Faster -O2?

I have a rather very complex app running on a T4.1 that involves SAI, USB Host, SPI Slave, I2C, GPIO,PSRAM and more Im using VSC with PlatformIO. Since upgrading to TD1.60 I am now seeing my application hang in several places with no apparent reason. Im not sure if this is directly related...

Whats your goal? Capture a sample and play it back in a loop? Apply effects which are BPM synced?

Its all in the code block in the post I linked to above

I only used it briefly before taking a different direction for my project But here is the code https://forum.pjrc.com/index.php?threads/build-a-teensy-based-cdj-can-it-be-done.75232/post-349741

I just sent it some samples from a wav file to get the BPM. Bare metal, no RTOS for me

Ive used this library for beat detection. Was simple to implement and quite accurate https://github.com/michaelkrzyzaniak/Beat-and-Tempo-Tracking

Why not use an optocoupler?

This is the level shifter I used (but from AliExpress) and while I can read packages, Its not sending them nicely But, I did get the components today to build out a logic level shifter based on the 75HC245, but the pullups were wired idividually to 5v, and the buffer's vcc and control pins to...

Master is a CDJ1000 mk3 panel Mode3. MSB first. 27 byte long frame. 4 wires in total: MISO, MOSI, CLK and CS between 7-10cm long. I can't go any shorter. Wired to SPI on the T4 via a logic level converter as the CDJ is 5v logic CS->10 , MOSI->11, MOSI->12, SCLK->13 (Tomorrow I will be getting...

@sicco hey I've come back to the slave SPI stuff as I now have a newer CDJ panel that is configured as an SPI master It has four wire setup which is wired to SPI on my T4.0 I've been playing around with tens of sketches using Claude generated code and no matter which version I use (Claude or...

@houtson this is quite amazing, am pleasantly surprised you got this to work!! I haven’t tested it yet, but I have a few questions 1. I understand this supports only mono at the moment, would stereo be possible? 2. Are you able to estimate how performance heavy this is on the Teensy? This...

I’ll try it out soon and report back

Ah, yes I am using a T4.1 with my own WAV file - stereo 44.1khz

Hey Paul I tested this It's playing really slow, and the pitch is really low too. this is at 1.0f playback speed I think the phase vocoder approach will be the only way do do this properly

I think OP wants to be able to time stretch in realtime with variable playback speed. One of the ways of doing this is via granular synthesis but they don’t always sound so great. I’d be interested to see how this is achieved though. A better option would be a phase vocoder, but I am not sure...

+1

You went through the entire process of registering to this forum to ask a question about Minecraft? 🤣

You can use the 16mb version found on Micromod Teensy

SDIO has 6 pins - 4 data line, a clock line and a command line. Two additional GPIOs are needed to control the sleep state and an interrupt trigger. IIRC, the murata chip variant that was used for this project does not support SPI. Those that do from the w43434 series are discontinued. This is...

This was going to be my next question I've seen this in commercial hardware (Pioneer DJ) where long traces and/or wires are used between MCUs that communicate over SPI

Are you using the exact same code on both the test bench and your PCB assembly? How long are the wires between the Teensy and the slave device on both setups? Do you have good grounding on your PCB? I was having some trouble with DMA enabled SPI Master/Slave between two Teensy 4's. I couldn't...

Any official release for 1.60 on PlatformIO?

You can get an SSD1963 7” display and run it over 8/16 bit parallel bus and get a 30hz+ refresh rate with an optimized app You can see my latest project here using one https://www.facebook.com/share/p/1DKbUVxkxa/?mibextid=wwXIfr

If you’re using a T4.0 - ILI9488_t3

I have a ground between both MCUs/boards :)

@sicco After having suceess on the bench test with SPI, it once again failed off the bench even with the slight mods made to stabilize it I decided to try your 1-Wire UART solutions which works VERY well with the PacketSerial class you added on top of it I set Baud at 2M and transferring a 32...

Please elaborate. Based on what facts have you made this statement?

You can use Kurt’s document to get full pin mapping and capabilities https://github.com/KurtE/TeensyDocuments/blob/master/Teensy4%20MicroMod%20Pins.pdf

@sicco wanted to update you on some progress with your SPI Slave lib As before, I wasn’t getting very stable results, and the payload would start to drift very quickly I threw the lib into Claude and gave some context to the issue. It made 1 change - removed the LPSPI_IER_WCIE register from...

After much testing I can confirm that the pin mapping in @KurtE document is correct. Sparkfun’s SDIO pin specific section has incorrect MM<>T4 pin mapping @Paul FYI

I think you would need an OTG cable between the Android device (you didn’t mention its type) and the Teensy.

There is some conflicting information between the Sparkfun TMM docs and @KurtE pin mapping document I'm specifically referring to the SDIO/SPI2 pin mappings. Per Sparkfun (https://learn.sparkfun.com/tutorials/micromod-teensy-processor-hookup-guide/hardware-overview) these are the correct pin...

The components that’s supposed to send the wake up signal is the transciver, as it will pull the RDX pin LOW when it detects a bus wakeup sequence, and that only. Teensy does not have this capability built into the controller. Sending a std frame won’t trigger that as far as I know. But, there...

@ifrythings so just to confirm, you have a separate GPIO for the wakeup signal, which is just bridged to the relevant CAN_RX pin?

@defragster the WFI instruction will put it into Sleep mode, but not deepSleep or Hibernate @ifrythings Another thing you can try, but I don't like this solution much, is to use a voltage divider on the CANL line into a GPIO and sense a rise on that signal to wake up.

@ifrythings Idea, you might have tried this and I missed it - bridge the RX pin to another GPIO, and use that GPIO for the wakeup trigger That way, you don't need to muck around with reconfiguring CAN pins or setting the RX pin to GPIO for the trigger.

@ifrythings Try this: When it’s time to sleep, stop all CAN TX’s and disable RX interrupts. Configure Snooze and then go into the relevant sleep mode. Regarding the 30mA in sleep mode - I recall a thread where someone observed this in sleep, but in deep sleep and hibernation it dropped even...

I tried this many times, but could not get it to work. I think the best thing you can do if find a CAN transceiver that can indicate when the bus is active,. This will usually be a state where it detects a wake up patten on the bus, and will pull RDX low So what you would do in your app is...

Have you tested this library in place? https://github.com/Richard-Gemmell/teensy4_i2c

The exact same post was posted on lvgl’s forum Seems like a poor marketing attempt to the wrong target audience Why go to the trouble of connecting this up to a Pi via an LVDS-HDMI converter, to then use the teensy just for data acquisition when you can do that on the Pi? Just get a smart...

Thats great, but how did you wire it to a Teensy?

So it worked?

This might work? #include <sqlite3.h> // Teensy 4.1 EXTMEM functions (from smalloc library) // These are already available in the Teensy core extern "C" { void *sm_malloc(size_t size); void *sm_calloc(size_t nmemb, size_t size); void *sm_realloc(void *ptr, size_t size); void...

I'm hitting a bit of a snag with this Only way to overcome it is to move the heap to extemem. But that is causing some other issues for me in other parts of my app

@Sam Halvoe quick question Is there a way to tell SQlite to allocate memory in extmem? Specifically when it needs to load a rather large blob from a table.

@mjs513 thanks for getting the example together Mike! I was able to get the PS and AS to blend without an issue - see the big waveform here on the AS with LVGL on the PS But what I actually wanted to do is draw a full frame with a partial buffer on the PS, each time drawing a section. Only way...

Few days have passed by, and now I can play the audio file using my very simple sync_i2s library (ISR based, loads a channel on each interrupt) AND I can sync the 3 band dynamic waveform to the play position Ive changed my display flush setup to use the PXP. Now I process LVGL in dual buffer...

Three letter: WOW! Nuff said