Re: rom_i2c funcs?
Posted: Fri Sep 24, 2021 9:27 amI have done some more experimenting in the meantime, with some more information I found.
All "alternative" frequencies that are offered this way make the APB bus change too. That has interesting consequences. As I already expected the wifi system can't handle the APB bus being other than 80 MHz, the UART needs tweaking (ok, not that much a problem) but also the timers no longer run at frequencies as expected. And last but not least, I expect all sort of issues with the built-in peripherals.
What I am looking for is purely the cpu core running at a higher speed, while leaving the APB at 80 MHz. It may or may not be possible with the PLL and clock dividers, but apparently noone succeeded there (yet).
All "alternative" frequencies that are offered this way make the APB bus change too. That has interesting consequences. As I already expected the wifi system can't handle the APB bus being other than 80 MHz, the UART needs tweaking (ok, not that much a problem) but also the timers no longer run at frequencies as expected. And last but not least, I expect all sort of issues with the built-in peripherals.
What I am looking for is purely the cpu core running at a higher speed, while leaving the APB at 80 MHz. It may or may not be possible with the PLL and clock dividers, but apparently noone succeeded there (yet).