Hi Luckfox team,
I am trying to determine whether the Luckfox Pico Mini can detect if power is being supplied through USB-C VBUS or through VSYS/header input.
I searched the forum and found this related thread:
Is there a way to determine if USB-C connected?
In that thread, Luckfox mentioned that USB_VBUSDET is not exposed by default, and that using it on some boards may require jumper wiring.
However, I am specifically asking about the Luckfox Pico Mini schematic net USB_DET_IN.
In the Pico Mini schematic, USB_DET_IN appears in the USB power input section as a resistor divider from USB VBUS:
* R26 = 51 kΩ from VBUS to USB_DET_IN
* R28 = 100 kΩ from USB_DET_IN to GND
- Schematic USB Power in section
This gives approximately 3.3 V on USB_DET_IN when USB VBUS is present.
However, I cannot find where USB_DET_IN is connected elsewhere in the schematic. I do not see it connected to the RV1103/RV1106, PMIC, header pins, ADC, GPIO, or any test point.
Could you please confirm whether USB_DET_IN on the Pico Mini is physically connected to any of the following?
1. The RV1103/RV1106 USB_VBUSDET pin
2. A test point
3. A GPIO or ADC input
4. Another circuit block not clearly shown in the schematic
5. No destination / unused net
If it is connected to the SoC, could you also provide the corresponding pin name and the Linux GPIO / ADC / device-tree node needed to read it?
Goal: Detect in software whether USB-C VBUS is present, so the application can behave differently when running from VSYS/header power without USB connected.
Thanks.
