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Thanks, didn't know it was doing that. That definitely explains the behavior.



Okay, so I'm not aware of a decoration for a segment of RAM1 DTCM, and in my mind declaring that it has to be in...

Seems to work casually, I'll work it out a little more later.

I'm not convinced that the problem is (at least solely) caching - playing with this a little over lunch today, I found (as I'm sure...

Thanks, that gives me somewhere to look. I've got a version of the RA8875 driver that's doing DMA (8-bit only) and suffering from the same issue. I'll play with flushing the cache first to see if...

Kurt, you probably know this answer too...

Here's a test program (wired up on a Teensy 4.1) that dumps a 320x240 16-bit image on to an ILI9341, using DMA. Works great as long as it statically...

Got it, thanks for the clarification Kurt.

I see it clearing the receive and transmit bits. But it's also setting all of the error condition bits. Is that intentional?

In this line


_pimxrt_spi->SR = 0x3f00; // clear out all of the other status...


I wonder if Paul meant to mask out the bits, rather than setting all of the error condition bits.


...

Teensyduino 1.45's keyboard handling (usb_keyboard.c) has this common pattern twice:



while (1) {
if (!usb_configuration) {
return -1;
}
...