about serial port pin H12,G12.

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX2
1

ALL:
The serial port uart0(H12,G12) isn’t work. we use the nvidia’s base board,and the dts about serial port is the same to nvidia. The uart3(H9,H10), uart1(D9,D10), uart2(B16,B15) all ok.

  We found a check(test ?) point at U8,which is in the "P2597_C02_OrCAD_schematics.pdf", at page15,  B3(COM1) . The pin always be low.

  And,I use "Jetson-TX2-Generic-Customer-Pinmux-Template.excel" to set  H12 to GPIO3_PT_00(GPIO464), set G12 to GPIO3_PT_01(GPIO465). After enter ubuntu,I set these two pins to 1,but we use Oscilloscope to test it,there are always be low.

  May be I missed something?
2

hello XuXiang,

could you please have a try by using linux commands to pull-up GPIO pins,
you should also check Tegra Linux Driver Package TX2 Adaptation Guide for GPIO number calculation.
for example, to set GPIO220 pin values.

cd /sys/class/gpio/
echo 220 > export
echo 1 > value
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Thanks.