Why GPIO31 is NA?

3.3V ( 1) … ( 2) 5V |
| i2c2 ( 3) … ( 4) 5V |
| i2c2 ( 5) … ( 6) GND |
| unused ( 7) … ( 8) uartb |
| GND ( 9) … ( 10) uartb |
| unused ( 11) … ( 12) unused |
| unused ( 13) … ( 14) GND |
| NA ( 15) … ( 16) unused |
| 3.3V ( 17) … ( 18) unused |
| unused ( 19) … ( 20) GND |
| unused ( 21) … ( 22) unused |
| unused ( 23) … ( 24) unused |
| GND ( 25) … ( 26) unused |
| i2c1 ( 27) … ( 28) i2c1 |
| NA ( 29) … ( 30) GND |
| NA ( 31) … ( 32) unused |
| unused ( 33) … ( 34) GND |
| unused ( 35) … ( 36) unused |
| unused ( 37) … ( 38) unused |
| GND ( 39) … ( 40) unused
GPIO ( 15) (29) (31) is NA, how can i set unused?

and if i | Configure for compatible hardware | chose MCP251x CAN Controller, Will prompt me an error:FATAL ERROR! Failed to get pin number for node /fragment@2/overlay/header-40pin-pinmux/pin37/! Does anyone have the same problem as me?

hello hnwangkg,

you may download pinmux spreadsheets for checking Nano’s pinmux table.
for example,
pin-15 / GPIO12 / GPIO3_PY.02
pin-29 / GPIO01 / GPIO3_PS.05
pin-31 / GPIO11 / GPIO3_PZ.00

you should also refer to Jetson Nano Module Data Sheet and check [Table 5 Dedicated GPIO Pin Descriptions].
for example, GPIO01 / Camera MCLK #2 (CLK)
please select those pins without alternate function to develop your use-case.
thanks

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