thebigg

Perhaps the callbacks need more STACK space than you have available. Post the memory information generated after the build so we can look to see just how close to the edge you actually are.

The definition of DMAMEM is in avr/pgmspace.h. So try adding this at the top of your source file #include <avr/pgmspace.h>

Try msg.buf[6] = 0xA5; msg.buf[7] = 0x5A;

Getting steadily more bonkers. 64 output channels, with a different frequency / waveform combination on each one. As shown it's taking 22% CPU and 64 audio blocks, plus ~770mA from the USB ( :eek: ). I can reduce the CPU to 5% by using sine and...

Or you could just use this https://github.com/sstaub/TeensyID

First one working

@wwatson - Yes I'm using SPI. Unfortunately, the above changes have made things unstable (an endless stream of Serial.println("2D ready failed"); ) and I have reverted them. My setup is probably a little unusual in that I have *very long* wires...

Changing #define DRAM_FREQ 166 // 120 // SDRAM clock frequency, unit: MHz. RA8876 to #define DRAM_FREQ 160 // 120 // SDRAM clock frequency, unit: MHz. RA8876 gets rid of the compiler warning and still "feels" faster. Also does not exceed...

Thanks for this. Unfortunately using these values results in an overflow. It works, but probably not as intended lib/Ra8876LiteTeensy/src/RA8876_t3.cpp:809:69: warning: unsigned conversion from 'int' to 'ru8' {aka 'unsigned char'} changes value...

The Main board and Wings are now live on Tindie if anyone wants to procure via this channel rather than buying boards direct from JLCPCB. Pricing is $US. Tindie: 8x8 Teensy Audio Board Sadly, I couldn't find any cheaper postage, so best to...

I've banned MidnightEcho42.

Please stop posting ChatGPT generated rubbish. It adds nothing the the thread.

All buttons are illuminated! Below the mod control is the fixed control for filter resonance. Back

more ChatGPT spew

^^ This AI generated spambot is wrong, the 4-pin cable DOES have a 5V line, it's only missing an extra ground line which doesn't matter.

Aside from the above, I believe you have a bit of a logic bug in your posted code for (int i = 0; i < msg.len; i++) { Serial.print(msg.buf[i]); Serial.print(" "); Serial.println(""); switch (msg.buf[1]) {...

The boards work great!

I would use something like an INA219

Well lookee here ... it's yet another Teensy-based synth ... or might be, if I ever finish it. But it says "Blog" in the category heading, so this may serve to stimulate discussion if nothing else, and if I'm moved to do so I can report progress...

Calling SPI.begin() will assume you are using the default pins. CS=10, MOSI=11, MISO=12,SCK=13 If you wish to use alternate pins/ports, you will need to ensure that SPI is initialized accordingly and the library has support for alternative SPI...

As far as I know there are some limitations as to which psram chips are supported. I assume you have read this?

Is there another device on the bus to ack the message? Without the ack it will just resend forever

To be safe you should probably use the value from SD.h #define MAX_FILENAME_LEN 256

No. Arduino is 5V. Teensy 4.1 is *NOT* 5V tolerant. You will need to do something to guarantee that the voltage present on any teensy4.1 pin never exceeds 3.3V

Have you tried the 15 second reset yet?

Before, I try to answer these, I thought maybe should step back a second and give a little more background information. Half Duplex: The Dynamixels use half duplex Serial to communicate. That is that there is only one data wire between them...

That's unusual but seems possible. See this application note. Paul

You are using an external CAN transceiver chip on each port, right?

This is a derivative of the PD0LEW design, using a Teensy 3.6. This version uses an RA8875 display and has been a real pain in the rear to program it! I had some help interference from various AI services that mostly led me astray, but...

Does this help? I use the following in my app. extern unsigned long _heap_start; extern unsigned long _heap_end; extern char *__brkval; uint32_t freeRAMTeensy() { return (char *)&_heap_end - __brkval; } uint32_t freeStackTeensy() {...