Spi no data

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

Hi,
how can use spi on nano Module P3450 under l4t 32.3.1.
had config the dts file, but no loop test data.
Anyone can help check is this right as below,
if wrong, how to correct with dts or devmem ?

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3

Have a check this. Your pinmux configure still stay as GPIO pin.

4

@ShaneCCC
Hi，thanks.
I use l4t 32.3.1, u-boot had remove the pins.

Others config also did but useless. I will check again.
Could you let me know how to config the gpio as function using devmem just like pwm.
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5

anyone who can help me ?

6

After update the u-boot the GPIO pin still the same? Could you update to r32.4.3 or update the u-boot.bin from 32.4.3

sudo cat /sys/kernel/debug/tegra_gpio

7

@ShaneCCC
how to update u-boot pin?
you mean there are the pins about spi in 32.3.1 or later version in u-boot?

could you tell me how to change the pins state with devmem?

8

The latest u-boot.bin have remove those SPI pin as GPIO pin.
For the devmem you need to figure the address of the GPIO_PC[0-4] ,
the base address is 0x600d000 the offset you can check the …/kernel/kernel-4.9/drivers/gpio/gpio-tegra.c