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by RogerClark
Sat Nov 25, 2017 5:11 am
Forum: Postbag
Topic: Rogers postbag
Replies: 94
Views: 5574

Re: Rogers postbag

Aren't you just wasting the additional power by using a linear LDO regulator? BTW, I tested those normal Buck converters from eBay but the efficiency is not that good when converting from 5V to 3.3V; probably around 80% Re: Solar panel + battery I would not trust the quality of the solar panel or th...
by RogerClark
Sat Nov 25, 2017 5:05 am
Forum: General discussion
Topic: OverClock. at Runtime ~90MHz
Replies: 25
Views: 253

Re: OverClock. at Runtime ~90MHz

It seems USB supports suspending.. so you could in theory, boot, enumerate USB, suspend, run at crazy speed, go back to normal speed, un-suspend, say something sane on USB, rinse, repeat. http://wiki.osdev.org/Universal_Serial_Bus#%20Remote%20Wakeup%20Capability It seems to imply in that doc that t...
by RogerClark
Sat Nov 25, 2017 2:04 am
Forum: General discussion
Topic: OverClock. at Runtime ~90MHz
Replies: 25
Views: 253

Re: OverClock. at Runtime ~90MHz

Andy

Thats an interesting suggestion. e.g. change to 72Mz in the USB ISR

Unfortunately I don't know enough about USB to know quite when data is clocked in and out etc
by RogerClark
Fri Nov 24, 2017 11:49 pm
Forum: New users MUST post here first, and let us know a bit about you and your projects
Topic: Hello from Brazil
Replies: 5
Views: 35

Re: Hello from Brazil

STLink drivers are separate from the USB Serial and USB DFU drivers

In my repo the drivers are here

https://github.com/rogerclarkmelbourne/ ... rivers/win

Specifically install_drivers.bat
by RogerClark
Fri Nov 24, 2017 9:26 pm
Forum: New users MUST post here first, and let us know a bit about you and your projects
Topic: Hello from Brazil
Replies: 5
Views: 35

Re: Hello from Brazil

Probably the USB pull up resistor needs to be modified as the USB re enumeration is not working.
I.e they upload via STLINK

Or they have not installed the drivers
by RogerClark
Fri Nov 24, 2017 9:21 pm
Forum: General discussion
Topic: Problem with PWM Output lots of noise.
Replies: 8
Views: 141

Re: Problem with PWM Output lots of noise.

I do not know what priority the PWM is set to by default, perhaps it’s the highest possible already.

You would need to read the full manual for the STM32F103 to find that information
by RogerClark
Fri Nov 24, 2017 9:18 pm
Forum: General discussion
Topic: OverClock. at Runtime ~90MHz
Replies: 25
Views: 253

Re: OverClock. at Runtime ~90MHz

Pito

Did you notice if the USB stops working if you switch to 96 MHz for a short time ?

It normally takes the PC host quite a long time to notice the USB device is not working,

So I wonder if switching to 120 MHz for 100ms would kill the USB?
by RogerClark
Fri Nov 24, 2017 9:03 pm
Forum: Postbag
Topic: Rogers postbag
Replies: 94
Views: 5574

Re: Rogers postbag

I don’t think Supercapacitors are cost effective, and most of them seem to be 2.7V so I would need 2 of them, and they are more expensive than LIPo for the same capacity It’s probably better to buy a bigger solar panel Re:Google Ads LOL, I block thousands of add server urls at DNS level as well as r...
by RogerClark
Fri Nov 24, 2017 10:32 am
Forum: General discussion
Topic: OverClock. at Runtime ~90MHz
Replies: 25
Views: 253

Re: OverClock. at Runtime ~90MHz

alexandros wrote:
Fri Nov 24, 2017 8:20 am
RogerClark wrote:
Thu Nov 23, 2017 8:13 pm

Or, it may be possible to run at 128MHz for a few milliseconds without impacting the USB at all.
Thanks Roger!!

Any code snippet for that??
No. I'm not aware of any code to change the clock speed during at runtime.
by RogerClark
Fri Nov 24, 2017 4:32 am
Forum: General discussion
Topic: Newbie question about 'short' and 'uint16_t' data types
Replies: 10
Views: 110

Re: Newbie question about 'short' and 'uint16_t' data types

No worries

Someone may spot an optimisation...