GPIO expander

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX1
1

Hello,

There has a I2C(tca9539) device for TX1 GPIO expansion.Currently, we know it could control using the command of Linux i2c tool, but we couldn’t apply this into our coding(c or c++ program).
It seems that TX1 may have the driver for this I2C IC, so we could modify the device tree, and we could use the GPIO function such like gpio_get_value/gpio_set_value for coding in userspace.
This idea is just what we guess.
Is this make sense? If it’s possible, what’s the relative file we should modify?

Thanks

2

Hi Ray0420,

I’m not familiar with this. What you said does make sense and you can search “tca9539_77” or “tca9539_74” to understand how to set it in device tree.

3

Hi vickyy,

Thanks for your reply.