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cnlohr / nosdk8266

Trying to make ESP8266 projects without a big SDK.
MIT License
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Running at 1.848 GHz but without a UART connection? #12

Closed 0z4 closed 5 months ago

0z4 commented 2 years ago

So I was trying to get 462MHz to work playing with the PLL and MAIN_MHZ registers, when I tried to change the led blink rate in main.c, though, for the UART port I was getting only nonsensical garbage (probably because of the strange frequency of the PLL) The led behaved as I had specified, that is, the time between blinks changed. That was when I kept increasing the frequency periodically until I reached 1.848 GHz. I am not very excited by this discovery because surely you had already noticed it while working, but I am thinking, If i implement an I2C communication using GPIO and call_delay_us functions? What do you think about this?

Regards.

cnlohr commented 2 years ago

WHUT??? @0z4 I have no idea how this was possible. Can you share more about your various settings?

cnlohr commented 2 years ago

Please also share any evidence you have surrounding this operation. I was not able to get the chip to boot at all past the speeds I listed.

I am also incredibly curious what performance you were able to eek out of the I2S port.

0z4 commented 2 years ago

Well, check my fork, i map all possible PLL registers, after disabling the cache and the I2S, when you pass 378MHz the FLASH speeds explode, it can't divide any funther. :(