I have a LED lighting circuit using Tegra X1 GPIOs. (Lighting when low output.)
I’m observing GPIO voltage level until boot kernel.
Both pads are measured voltage 0V until boot kernel.
But I expect they are 1.8V.
(according to JetsonTX1_OEM_Product_DesignGuide_20170912.pdf, they are internal pull-up)
Please give me advice:
- Why 0V in spite of internal pull-up?
- Are there pads which is set as GPIO at power-on? If yes, which pad?
- I think it is correct to be written about default register value in Tegra_X1_TRM_DP07225001_v1.2p.pdf. Is it right?