uart

uart python

Sample program to demonstrate UART connection between Arduino Uno and Atlas 200 DK board using the python-periphery python library.

Prerequisites

• Atlas 200 DK board, PCB type IT21DMDA
• Arduino Uno R3

Setup

• Connect Atlas board Tx (pin 16) to Arduino Rx. This sets up the connection to send from Atlas to Arduino.
• Connect Atlas board Rx (pin 18) to Arduino Tx. This requires a voltage divider circuit to step down 5V Arduino Tx to 3.5V Atlas board Rx.
• Connect Atlas GND to Arduino GND.
• On the Atlas board, as the root user, edit the /etc/rc.local file and insert the following commands before exit0. Then restart the board. This will set the appropriate permissions need to run the samples.

echo 504 >/sys/class/gpio/export
echo 444 >/sys/class/gpio/export
chown -R HwHiAiUser /sys/class/gpio/gpio444
chown -R HwHiAiUser /sys/class/gpio/gpio504
chown -R HwHiAiUser /sys/class/gpio/gpio444/direction
chown -R HwHiAiUser /sys/class/gpio/gpio504/direction
chown -R HwHiAiUser /sys/class/gpio/gpio444/value
chown -R HwHiAiUser /sys/class/gpio/gpio504/value
chown -R HwHiAiUser /dev/i2c-1
chown -R HwHiAiUser /dev/i2c-2
chown -R HwHiAiUser /dev/ttyAMA0
chown -R HwHiAiUser /dev/ttyAMA1
usermod -aG HwHiAiUser HwHiAiUser

Run

1. Upload sketch.ino to Arduino Uno board. Open the serial monitor.
2. On the Atlas board, run python3 uart.py. If the UART connection works, you will see the following output on the Atlas board terminal:

uart connection test
Write to UART
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