Access GPIO through Direct Memory Access

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

Hello everyone,

I have been using sysfs gpio with JetsonGPIO library ([url]https://github.com/jetsonhacks/jetsonTX1GPIO[/url]) and it seems lag a bit. So I want to access gpio with a faster method. Is there any other faster way to access GPIO pins on jetson TX1 module ? For example in raspberry pi, using pigpio library, GPIO pins can be accessed very fast without any hassles.

Thanks.

2

hello thimiralakmal,

you could using console commands to export GPIO pins.
for example, you could control gpio 220 as below.

cd /sys/class/gpio/
echo 220 > export
echo out > direction && echo 1 > value
3

I think that’s what exactly happening in JetsonGPIO library. Using console also I did it. The problem is the inaccuracy of timing. I use poll() function to detect a falling edge to decode a ppm (pulse position modulation) signal via gpio input. So, the timing has to be accurate to a microsecond which is not happening.