Basic USB-C Sink
Overview
This example demonstrates how to create a USB-C Power Delivery application and how to generate USB VIF policies in XML format using the USB-C subsystem. The application implements a USB-C Sink device.
After the USB-C Sink device is plugged into a Power Delivery charger, it negotiates with the charger to provide 5V@100mA and displays all Power Delivery Objects (PDOs) provided by the charger.
Requirements
The TCPC device used by the sample is specified in the devicetree
node that’s compatible with usb-c-connector.
The sample has been tested on ST B-G474E-DPOW1 Discovery and
ST STM32G081B Evaluation. Overlay files for the two boards
are provided.
Building and Running
Build and flash as follows, changing b_g474e_dpow1 for your board:
west build -b b_g474e_dpow1 samples/subsys/usb_c/sink
west flash
Connect a charger and see console output:
Sample Output
Unattached.SNK
AttachWait.SNK
Attached.SNK
PE_SNK_Startup
PRL_INIT
PRL_HR_Wait_for_Request
PRL_Tx_PHY_Layer_Reset
PRL_Tx_Wait_for_Message_Request
PE_SNK_Discovery
PE_SNK_Wait_For_Capabilities
RECV 4161/4 [0]0a01912c [1]0002d12c [2]0004b12c [3]000640e1
PE_SNK_Evaluate_Capability
PE_SNK_Select_Capability
PRL_Tx_Wait_for_PHY_response
PWR 3A0
RECV 0363/0
PRL_Tx_Wait_for_Message_Request
PE_SNK_Transition_Sink
RECV 0566/0
Source Caps:
PDO 0:
Type: FIXED
Current: 3000
Voltage: 5000
Peak Current: 0
Uchunked Support: 0
Dual Role Data: 1
USB Comms: 0
Unconstrained Pwr: 1
USB Susspend: 0
Dual Role Power: 0
PDO 1:
Type: FIXED
Current: 3000
Voltage: 9000
Peak Current: 0
Uchunked Support: 0
Dual Role Data: 0
USB Comms: 0
Unconstrained Pwr: 0
USB Susspend: 0
Dual Role Power: 0
PDO 2:
Type: FIXED
Current: 3000
Voltage: 15000
Peak Current: 0
Uchunked Support: 0
Dual Role Data: 0
USB Comms: 0
Unconstrained Pwr: 0
USB Susspend: 0
Dual Role Power: 0
PDO 3:
Type: FIXED
Current: 2250
Voltage: 20000
Peak Current: 0
Uchunked Support: 0
Dual Role Data: 0
USB Comms: 0
Unconstrained Pwr: 0
USB Susspend: 0
Dual Role Power: 0
PE_SNK_Ready