Update Bluepill wiki data

Generic boards that are not Maple or Maple mini clones, and don't contain the additional USB reset hardware
michael_l
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Re: Update Bluepill wiki data

Postby michael_l » Fri Dec 02, 2016 12:55 pm

zmemw16 wrote:and if i add the same disclaimer?
without opening a bag of worms isn't that in the gpl; v2 & v3

re 10K - just lack of reading or understanding on their part?

stephen


Well, I guess to me it is not clear what 'usb to work properly" means. But that's just me..

zmemw16
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Re: Update Bluepill wiki data

Postby zmemw16 » Fri Dec 02, 2016 1:03 pm

i was referring to the usage of 4k7 or 10k, not usb.
however in order for usb host system to re-enumerate the usb, experience suggests a better value to use would 1k5 or 1k8 in parallel with the 10k, the value for use with a 4k7 is left as an exercise for the reader.
i don't know what the usb specification says.
stephen

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Rick Kimball
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Re: Update Bluepill wiki data

Postby Rick Kimball » Fri Dec 02, 2016 2:16 pm

zmemw16 wrote:i don't know what the usb specification says.


From the stm32f103c8 datasheet:

datasheet_usb1.png
datasheet_usb1.png (62.96 KiB) Viewed 128 times

edogaldo
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Re: Update Bluepill wiki data

Postby edogaldo » Fri Dec 02, 2016 4:12 pm

testato wrote:Seems that all the F103C8 work on 128KB, for now nobody come here for tell that he have a board that do not work on 128KB

viewtopic.php?t=1323&start=20#p18962

Cheers, E.

testato
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Re: Update Bluepill wiki data

Postby testato » Fri Dec 02, 2016 6:36 pm

michael_l wrote:Well, I guess to me it is not clear what 'usb to work properly" means. But that's just me..

I agree with you, it is not clear, so i changed the wiki to this if @Roger agree

Code: Select all

The USB standard require a 1.5k pullup resistor on D+, but this board is known to have a wrong value (R10 on the board). It ships with either a 10K resistor or a 4.7k resistor, but it should be replaced with a 1.5k resistor, or put an appropriate resistor value (e.g 1.8k) in between PA12 and 3.3V. It is also true that most of the board will also work with the wrong resistance, so it always pays to first try the smooth operation without changing anything.

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RogerClark
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Re: Update Bluepill wiki data

Postby RogerClark » Fri Dec 02, 2016 7:39 pm

I think the point to note is that the correct value is 1.5k, but some PCs are tolerant of incorrect value

testato
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Re: Update Bluepill wiki data

Postby testato » Fri Dec 02, 2016 7:56 pm

ok, i changed the last line to :

Code: Select all

It is also true that some PCs are tolerant of incorrect value so, before you change the resistance, you can try if it works in your case.

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RogerClark
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Re: Update Bluepill wiki data

Postby RogerClark » Fri Dec 02, 2016 8:06 pm

sounds good

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Rick Kimball
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Re: Update Bluepill wiki data

Postby Rick Kimball » Fri Dec 02, 2016 9:07 pm

While we are dusting and cleaning, I threw in a pinout picture and pdf link.

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RogerClark
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Re: Update Bluepill wiki data

Postby RogerClark » Fri Dec 02, 2016 10:42 pm

Thanks


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