GPIO Bit-Bang Speed Increase

Robotics & Edge Computing Jetson Systems Jetson TX2
17

Hi,

We have compared GPIO bit toggling performance between TX1 & TX2. We are seeing no difference in their performance. Attaching gpio_perf_debugfs script which toggles the bit value. Attaching script and results which are seen.
In gpio_perf_debugfs script,you will need to provide gpio and count values. For ex.
In TX1: gpio=187 count=100000
In TX2: gpio=387 count=100000
You can use any gpio number which is not being used by the driver.
gpio_perg_debugfs.sh

#!/bin/bash

echo "GPIO Performance Analysis Test"
echo -e "******************************\n"

gpio=$1
count=$2

echo $gpio > /sys/class/gpio/export
if [ $? -eq 0 ]; then
        echo "Exported GPIO-$gpio"
else
        echo "Failed to export GPIO-$gpio"
        echo $gpio > /sys/class/gpio/unexport
        echo "Unexported GPIO-$gpio"
        echo $gpio > /sys/class/gpio/export
        echo "Exported GPIO-$gpio"
fi

echo out > /sys/class/gpio/gpio$gpio/direction

SECONDS=0
echo "Started Bit-Banging"
for i in $(seq 1 $count)
        do
                sec=SECONDS
                echo 1 > /sys/class/gpio/gpio$gpio/value > /dev/null
                echo 0 > /sys/class/gpio/gpio$gpio/value > /dev/null
        done
echo "Ended Bit-Banging"
echo -e "\tToggled $i times"
echo -e "\tTotal Time taken $SECONDS"
if [ $SECONDS -eq 0 ]; then
        echo "Increase count"
else
        echo -e "frequency of the toggle $(( $i / $SECONDS ))" 
fi
echo $gpio > /sys/class/gpio/unexport
echo -e "Unexported GPIO-$gpio\n"
echo "******************************"

Thanks & Regards,
Shubhi

Bit_banging_results.txt (4.48 KB)