GIGA with display shield and OV7670

[KurtE]

@JGordonJones

Trying out the tft_picture_view_sd_giga_shield code you posted above. I've never used SDIO before. How is it's speed compared to SDFat? And how much difference does GIGA_digitalWriteFast.h make?

Should mention, the sketch is a quick conversion of one I did earlier that does the picture viewer on to an ILI9341 display using conversion of my Teensy ILI9341_t3n library. It has DMA updates to the screen and the like...

I also ran that same sketch on the Portenta H7 board I have. The HAT carrier that I have for it, has the SDIO SD adapter. Arduino has their own library for this, performance was not great.
More details about that over on the thread:

SdFat tests on GIGA R1

It is not worth using a SDIO driver with such a small gain. A good DMA SPI driver would be about four times faster than the current SPI driver. A SDIO driver does not help much if does it does transfers like the Teensy DMA driver. Only huge transfers go fast with modern cards. I was able to do that on Teensy with the FIFO driver. The Teensy FIFO driver starts a transfer and keeps the SD in block transfer mode as long as possible. Modern SD cards have huge flash pages and pipe-lined bufferi…

The digitalWriteFast is a lot faster, although in this case may not matter much, Not doing that much changing of IO pins. But it also has the digitalToggleFast call which I like...
More details in the thread:
digitalWriteFast for GIGA? - Hardware / GIGA R1 - Arduino Forum