2020-01-13 07:39 PM
I would like to buy an evaluation board for the STM32F469 chipset but am trying to use it with a circular display. Can I easily remove the LCD screen it comes with and use my own or is there another eval board that you can buy without a screen attached? Thanks!
2020-01-13 09:24 PM
What's compelling about the F4 over other STM32 devices?
The F769I-DISCO is available with or without a screen. It has a socket for LCD or HDMI adapter. The L4Rx DISCO has the same socket and round screen. Adapters on Web for additional round screens. The L4Rx EVAL comes with two screens, one rectangular like the F469I's and a round one.
2020-01-14 07:05 AM
I am working on a digital motorcycle speedometer project and am wanting to drive a 800X800 round display. Most of the displays I have found use the MIPI DSI interface. I was leaning toward the F4 because it seemed like the F7 was more powerful than I would need and I am not sure if the L4R would have a fast enough MIPI (500 Mbits/s)? I guess they are all pretty close in price so it wouldn't matter too much on which one I chose.
2020-01-14 09:11 AM
Depends some of the L4+ have enough memory to hold the frame buffer, certainly for the screen ST uses, so the bandwidth available is quite high compared to the externally bussed memory.
As I recall the L4+ has a method of managing the frame buffer so that non-visible sections of the round screen don't consume memory.
500 Mbps is only 62.5 MBps, which is like 15.625 MHz on a 32-bit wide memory.
2020-01-14 05:57 PM
Really appreciate the replies! I don't know if the L4+ chips (or any of them for that matter) will have enough memory to hold a frame buffer. I could be totally off but I was using the equation 800 X 800 X 2 = 1.28 Mbytes to calculate the size of the frame buffer? If I have to use external memory to double buffer the frames, what clock frequency do you think I would need the core to be?