sprite_demo fails on VGA board

[8bitkick]

Built with PICO_BOARD=vgaboard the sprite_demo fails immediately at runtime with the following message:

*** PANIC ***
System clock (192000000) must be an integer multiple of the requested pixel clock (25000000).

Changing the sys clock value to a multiple of 25MHz succeeds. Seemed to need 250MHz to render the whole screen but the OC is unstable after a minute or so on my Pimoroni VGA demo board:

set_sys_clock_khz(250000, true);

This may well not be the right fix :)

[lurch]

What if you set a sys clock of 125MHz? (I'm just guessing as I've not got a VGA board myself!) That was the speed that the RP2040 chips were going to run at by default, and it was only later that they got bumped to 133MHz.

[8bitkick]

Could well be right there this might have just been missed during this 125MHz update https://github.com/raspberrypi/pico-playground/commit/ef3bdfab11801d390f05e0cf52dd57fcab8b22cc ... I’ll give it a try

[8bitkick]

...ok 125MHz sys clock just renders a small slice of the screen. I guess there are some magic settings I'm missing here

[kilograham]

set PICO_SCANVIDEO_48MHZ=1 in the cmakelists.txt

[kilograham]

fixe