Overclocked usbhost issues

B

bk40

Well-known member
Hi.

I asked in my thread but didn’t get anywhere but I need to over clock the teensy 4.1 to get the polyphony I need but when going from 600 to 720 I then fail to detect anything on the host port. I have tried to initiate usbhost before overclocking using set_arm_clock but consistently fail to detect devices.

So my question is it possible to get usb host for midi controllers to work when over clocked or should I drop that option?

Secondary is it possible to drive the tft display when overclocking at > 720Mhz

To be clear usb via pc programming port and usb audio are all good regardless of over clock

Thanks
 
bk40 said:
Secondary is it possible to drive the tft display when overclocking at > 720Mhz
Click to expand...

Don't play with Midi so not sure the answer to that one but as for the TFT's up to 1mhz in testing. And right now running a graphics program at 816mhz with no issues.
 
I tried a quick test with File > Examples > USBHost_t36 > MIDI > Basic on a Teensy 4.1 running at 720 MHz, with an Akai LPD8 drum pad controller connected to the USB host port.

Everything seems to work fine, same as running at 600 MHz. I can touch the 8 pads for Note On and Note Off messages, and turn the 8 knobs for Control Change message.

Here's a screenshot. Notice 720 MHz in the bottom status bar on the Arduino IDE window. This test was done with the latest 1.61-beta1 version.

1778419780969.png
 
I also tried 816 MHz and 912 MHz. Both seem to work fine. Only ran briefly, as this Teensy 4.1 doesn't have a heatsink.

Also tried all the slow speeds. I'm surprised to see they all work, even down to 24 MHz. But this Akai LPD8 mk1 version (YouTube demo) is a 12 Mbit/sec speed device. Not sure if 480 Mbit/sec really works when the CPU runs so slowly.
 
Awesome guys really should have went back to the basic example and tried that. Will
Do the same with my current hardware and likely fix something I’ve broken
 
Thanks I went back to basics and tested with the examples and looks like I’ve got issues in hardware.

Back to drawing board or resoldering dodgy connections
 
PaulStoffregen said:
I also tried 816 MHz and 912 MHz. Both seem to work fine. Only ran briefly, as this Teensy 4.1 doesn't have a heatsink.

Also tried all the slow speeds. I'm surprised to see they all work, even down to 24 MHz. But this Akai LPD8 mk1 version (YouTube demo) is a 12 Mbit/sec speed device. Not sure if 480 Mbit/sec really works when the CPU runs so slowly.
Click to expand...
Thanks I went back to basics and removed the board and tested standalone. My teensy board is failing. Now my soldering is about as good as my equipment so good chance something got hit when I added the risers and psram.

I have a new board that I never used and that can run my code at speed.

I have tried to add in crash report but I do not get a response is there any other hardware diagnostic reports that I can pull.

Failing that this board will just be used for ui or fx only as the others here seem to have done.

I’ll run some temp cpu checks tonight as well
 
You must log in or register to reply here.
Back
Top