W. H. Heydt wrote: ↑
Thu Dec 19, 2019 12:02 am
glenk wrote: ↑
Wed Dec 18, 2019 11:12 pm
One person has now indicated that they have a RP4 with an apparently fully working USB C power input, not sure how word that correctly but you get my gist.
https://www.raspberrypi.org/forums/view ... 3&t=259629
They haven't confirmed that they have a v1.2 RP4 yet but it would seem likely.
Surely the Raspberry Pi Foundation can now tell us what the changes with v1.2 are.
In that thread NONE of it is clear. The OP hasn't responded with data to support the Pi4B version being tested and hasn't done anything to support the idea that an e-marked cable is being used. I don't think that thread even rises to the level of anecdote, let alone actual data.
I'm the OP of the linked thread above.
I admit that in my original post, I did not fully entered in fully "I will figure out what is going on" mode.
I stated my final words on https://www.raspberrypi.org/forums/view ... 9#p1583459
As I said in this post, the route on the back on the board is not the same near R1 and R79.
I also stated that I measured the resistance of both R1 and R79 : 5,1 kOhm.
that I measured 10,23 kOhm between "left leg of R1" and "north leg of R79", which is the correct "addictive resistance value" of both of them being in "serial" and no longer incorrectly in the orignal-incorrect disposition of CC1 and CC2 sharing R1 and R79.
Regarding "the OP hasn't done anything to support the idea that an e-marked cable is being used", I expressly
stated that :
- works with USB-C PD power supplies : Macbook 12" 2015, Anker PowerPort Speed+ Duo + "USB-C charger cable (apple)", LG 32ul950 screen (with a USB-C non-TB3 cable, plugged on the USB-C-TB3-70W-able port of this screen)
I guess that all "USB-C charger cable" from apple
, no matter which "USB-C PD charger (apple)" they were sold with, would be e-marked.
In this case, I immediately adds that it works :
- with the 27W USB-C apple charger from a MacBook 12" 2015 + USB-C<->USB-C cable officially distributed with it
- with the 87W USB-C apple charger from a MacBook 15" 2018 + USB-C<->USB-C cable officially distributed with it
Being 87W, and needing to be able to deliver the 20V power profile, I guess that the cable is e-marked
(https://commons.wikimedia.org/wiki/File ... erRule.svg),
- with the most expensive official USB-C<->USB-C TB3 cable from Apple plugged to "Anker PowerPort Speed+ Duo"
- with the most expensive official USB-C<->USB-C TB3 cable from Apple plugged to a TB3 port of "MacBook Pro 15" 2018"
(yes, the MacBook Pro "on battery, not plugged to A/C" is now able to power my RPi4. with the same USB-C-TB3 cable that is otherwise able to deliver screen to two ul32950 4K screens daisy chained together, which considering the specs, two 4K screens on the same USB-C port means that the port+cable are both TB3 capable.)
I aim to personally only own USB-C PD charger and "good quality cable that won't fry themselves or my hardwares"
The previous RPi4 4GB that I owned before (an original one from September 2019) only booted with a "USB-A iPad mini 3 charger" + "a stupid no-name USB-A<->USB-C cable". There was NO other combinaison of charger+cable that made the original RPi4 4GB works.
The new RPi4 4GB that I posted about (delivered on the 16th of December
2019) , works with everything USB-C that I own. (all PD capable, with the best rating of the Google spreadsheet guy who rated different brands, and also works with all TB3 capable things