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1 -------------------------------------------------------------------------------
2 USB Power Delivery protocol
3 -------------------------------------------------------------------------------
4
5 This directory contains captures of data communication on the Control Channels
6 of Type-C USB connectors using the USB Power Delivery protocol.
7
8 Details:
9 http://www.usb.org/developers/powerdelivery/
10
11
12 Logic analyzer setup
13 --------------------
14
15 A 'Twinkie' USB type-C interposer was used to capture the communication
16 on the CCx pins:
17
18   Probe      Signal
19   -----------------
20   CC1        Control Channel 1
21   CC2        Control Channel 2
22
23 The type-C connectors are reversible, so the actual communication might
24 happen on CC1 or CC2 depending the polarity of the plug inside the receptacle.
25
26 Data
27 ----
28
29 Captured Between an Apple Macbook 2015 (with a USB type-C connector) and both
30 its 5V/14.8V power supply and an Apple USB-C to HDMI AV accessory.
31
32 The sigrok command lines used were:
33
34   sigrok-cli -d chromium-twinkie --continuous -o apple_power_brick.sr
35   sigrok-cli -d chromium-twinkie --continuous -o apple_av_hdmi.sr
36