how to set the clock speed

[tve]

How do I set the desired clock speed for a sketch? Is there a way to dynamically change it?

[GrumpyOldPizza]

It is statically configured throu the Arduino IDE.

…

On Fri, Aug 3, 2018, 10:09 PM Thorsten von Eicken ***@***.***> wrote: How do I set the desired clock speed for a sketch? Is there a way to dynamically change it? — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#29>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AG4QfKJyB6RVnUDtLVll1l58RdBsKwe5ks5uNK4BgaJpZM4VujOa> .

[tve]

Ugh. I'm using platform.io. Can't stand the IDE... DO you happen to know how it gets passed in? Else I'll have to make sense out of all the stm32l0_system.c clock code...

[tve]

Ok, found it: SYSTEM_CORE_CLOCK
Looks like I need to dig through the platform.txt and board.txt stuff to extract the configuration options in general...

[GrumpyOldPizza]

There are a few defined set throu the IDE. So yes, boards.txt / platform.txt would be a good starting point.

…

On Fri, Aug 3, 2018, 11:39 PM Thorsten von Eicken ***@***.***> wrote: Ok, found it: *SYSTEM_CORE_CLOCK* Looks like I need to dig through the platform.txt and board.txt stuff to extract the configuration options in general... — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#29 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AG4QfKKg5ejOgg3GHiYhwBEjLfC_yAKXks5uNML-gaJpZM4VujOa> .

[rmeldo]

Hi,
If through the Arduino I choose the 4.2MHz, which doesn't support the USB, will I still be able to upload the sketches through the USB or is that functionality disabled as well?
I guess I will find out when I try but will my delays and sleep times have to change accordingly?
Thanks
Riccardo

[GrumpyOldPizza]

You have to hold BOOT while toggeling RESET to put the chip again into bootloader mode, if you use lower clocks.

delays and sleep times do not have to be changed.