Atmel SAMA5D2

[csteaderman]

I'm bringing up a display connected to an Atmel SAMA5D2 Xplained evaluation board. I assumed that the display was a framebuffer as Atmel's sample code assigns a buffer for the display that gets sent to the display. It is setup for 8 bits per pixel, but the framebuffer expects each pixel to be represented by 3 bytes, rather than the 4 bytes that uGFX seems to want to allocate. Is there a way for me to configure uGFX to represent each pixel by exactly 3 bytes (24 bits)?

[inmarket]

A replacement framebuffer driver would need to be written that writes pixels byte by byte into 3 bytes per pixel format. The existing framebuffer driver assumes that each pixel is 1, 2 or 4 bytes so that it can write the pixel in a single cpu operation.

Similarly the existing framebuffer driver does not handle pixel sizes of less than 8 bits per pixel.

The changes should be simple by copying the existing framebuffer driver and modifying the pixel addressing and writing.

[csteaderman]

Thanks so much for the pointer. The final solution was even easier because the code to handle the 3 byte per pixel buffer had already been written in some support code from Atmel. I simply needed to modify the uGFX framebuffer calls to call the Atmel code. Now on to optimizations.