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I know this has already been reported but had the same issue with HardwareSerial * needing to be replaced with HardwareSerialIMXRT * when trying to use write9bit() function.

Hi So I've been playing with the Teensy 4.0 and the WIZ820io module and getting some pretty good results. However, I now want to switch to a WiFi link. Ideally I want the run the Teensy as an Access Point, rather than have it connect to a network. I have this working using an Adafruit ESP32...

That's a nice solution, I'm going to look at doing something similar but with a really short cable straight down to a board mounted under the teensy 👍

Thanks Sebastian, Good information to know! I guess this is why its better to use the onboard SD socket! I wish there was a socket available to fit the Teensy 4.0. Matt.

After trying many variations of hardware it simply comes down to this: The SPI bus does NOT behave well on a breadboard setup! I have spent way too long resolving this issue and even broke out the Logic analyzer, anyway, I ended up stacking the PJRC adapter directly onto the Teensy 4 and all is...

Well I purchased the Teensy WIZ820IO & SD card adapter but I'm still having problems getting both to work together! But now I'm getting different results! I changed the code to use the SD library rather than the sdFat lib, and I moved the SD initialization before the Ethernet init as this seemed...

Replying to my own post, I now have the Teensy 4.1 working with the WIZ820io. The issue in this case was a breadboard issue! cheap prototyping board! Anyway, now that is resolved, this leads me to the question how do you use the Internal Ethernet over the external SPI WIZ820io ?

My Teensy 4.1 arrived today, and I'm getting it rigged up but have hit a slight stumbling block. How do I get the Ethernet library to use an external device such as the WIZ820io or ultimately an SPI wifi device. When I run my test code on the 4.1 with the WIZ820io it doesn't seem to work, I'm...

Thank's for testing on your hardware, confirms what I thought that it is something to do with my hardware. I will plug in an analyzer today and have a poke around, but if I can't get it working I will wait for the new hardware to turn up and start again. Good to know you get the same cable...

The card adapter has no active or passive components on-board, just the signals routed through to the card pins.

I had added PU resistors to the CS lines, I could also try on the clk and signal lines. I do have an analyzer so I will see whats happening to the bus when card is plugged in.

Hi Kurt, The SD adapter on its own works fine, as does the Ethernet on its own. Which leads me to believe its something to do with the breadboard signal issues. The discontinued SD adapter just has the pins wired straight through to the SD card with not passive or active components.

Hi, I've been using the Teensy 4 with the WIZ820io Ehternet adapter for the last week or so and having great success at 30Mhz, that is until I added an SPIO SD card. Now I have issues getting the Ethernet adapter to initialize correctly. If an SD card is plugged in the WIZ820 either doesn't...

Well indeed it was an array being overwritten by a memcpy() using the wrong length of data. An error introduced when porting. I managed to track it down by increasing my global varibale size until I could reproduce the inconsistency of variables described above, then going through my functions...

Hi Kurt, Thanks for the reply. Yes I realize it's difficult without seeing code. I do alot of stuff on arrays using pointers, and maybe when I ported it and scaled my array sizes down something has gone adrift! | I can't imagine that I'm using that much stack memory, so my current theory is an...

Hi Mark, I'm not seeing anything untoward on compiler output. As for the stack I can't find anything that would be using that much! but t is the only explanation I have right now, but still don't understand why "static" fixes things.. Compile output: C:\Program Files...

Hi, I've just ported a rather large project from a BeagleBone to a teensy 4! I have simplified things somewhat and reduced the amount of data required but amazingly it ported fairly easily and runs incredibly fast! I'm loving the teensy 4 so far! however, I'm running into some strange behavior...

Perfect, thank you Paul!

Hi Frank, So I have my project built now, but I'm seeing there are issues with using the SD card to play audio files using the Audio lib. I have read that the standard "SD.h" does not support the Teensy 3.5 internal SD card, and have managed to get the example code running using the...

Thank you!

Hi, I have a similar audio related question for the 3.5, hope I'm not hijacking this thread. I'm working on a new design using the 3.5, previously using the 3.2 Teensy. I have the audio running from the DAC on the 3.2 and i'm pulling files from an SD card connected to the 3.2. So my first...

Great! Thank you Paul. Amazing product!

Hi, Which of the six serial ports have the FIFO buffer? Is there some resource i'm missing that I can find this kind of technical information? Cheers.