spiMaster.writeRead write buffer transaction limit about ioio HOT 6 CLOSED

Please make a pull request

from ioio.

Actually - I see now why there is a limit - with this:

writeByte((dataNeqTotal ? 0x80 : 0x00) | (resNeqTotal ? 0x40 : 0x00) | totalBytes - 1);

bit 7 + 8 are status bits, so there is only room for 6 bits to hold the length (63 max)

This corresponds to the SPI_DATA_ARGS definition in firmware/app_layer_v1/protocol_defs.h

So, it would require a firmware change to resolve. For an 128x128 16 bit color LCD the buffer size needs to be a lot larger. I was hoping there was a cheap, java side only fix to improve this. Oh well.

from ioio.

So, it would require a firmware change to resolve.

I've no idea how to do this. But when you know more, we could do this, if we have the source of it

from ioio.

The source code for the firmware is in the repository, but I have no idea either.

Hopefully the original author(s) could help with some expert advice.

from ioio.

@ytai Maybe you know this ?

from ioio.

This is the current state #191 (comment)

from ioio.