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PL02 Firmware

This is the firwmare for the Protectli UPS. It uses zephyr RTOS running on the ESP32 and an RP2040.

Getting Started

Before getting started, make sure you have a proper Zephyr development environment. You can follow the official Zephyr Getting Started Guide.

west init -m [email protected]:o7-machinehum/pl02-fw.git --mr main pl02-fw
cd pl02-fw
west update

Build & Run - ESP32/RP2040

The application can be built by running:

west build -b esp32_devkitc_wroom esp32-app --build-dir build/esp32
west build -b pl02_rp2040 rp2040-app --build-dir build/rp2040

Once you have built the application you can flash it by running:

west flash --esp-device /dev/tty.usbserial-0001 --build-dir build/esp32
west flash --runner jlink --build-dir build/rp2040

If flashing doesn't work on the ESP32, you might need to reduce the baud rate. Append --esp-baud-rate 460800 to the end of the flash command.

# If you don't have a jlink (programmer). You can use this.
sudo picotool load build/rp2040/zephyr/zephyr.elf

Build & Run - STM32

The STM32 doesn't not used zephyr, it's a libopencm3 project.

git submodule init
git submodule update

Install Deps

sudo pacman -S arm-none-eabi-gcc openocd # Or whatever your OS is

Building and flashing

cd stm32-app
make
make flash

ESP32 Networking

To connect the ESP32 to a WiFi network start by inserting the USB cable into board, so should see a serial device appear at /dev/ttyUSBx, or COMx for Windows. Open a shell here using minicom or otherwise.

# Scan for networks

uart:~$ wifi scan
Scan requested

Num  | SSID                             (len) | Chan (Band)   | RSSI | Security
1    | Turnip_WiFi                      11    | 1    (2.4GHz) | -57  | WPA2-PSK
2    | you-kids-get-off-my-lan          23    | 11   (2.4GHz) | -59  | WPA2-PSK
3    | hnm-68027                        9     | 1    (2.4GHz) | -73  | WPA2-PSK
4    | Sunrise_2.4GHz_CF0D50            21    | 1    (2.4GHz) | -88  | WPA2-PSK
5    | Sunrise_2.4GHz_6CD280            21    | 1    (2.4GHz) | -90  | WPA2-PSK
6    | Spalenring-Garage                17    | 6    (2.4GHz) | -90  | WPA2-PSK
7    | DIRECT-48-HP M28 LaserJet        25    | 6    (2.4GHz) | -91  | WPA2-PSK

# Connect to network
uart:~$ wifi connect "you-kids-get-off-my-lan" 1 Password1234
Connection requested
Connected
[00:00:31.616,000] <inf> net_dhcpv4: Received: 192.168.1.109

You should be able to ping the device on the network.

uart:~$ net ping 192.168.1.2
PING 192.168.1.2
28 bytes from 192.168.1.2 to 192.168.1.109: icmp_seq=1 ttl=64 time=14 ms
28 bytes from 192.168.1.2 to 192.168.1.109: icmp_seq=2 ttl=64 time=7 ms
28 bytes from 192.168.1.2 to 192.168.1.109: icmp_seq=3 ttl=64 time=4 ms

Various other networking things

uart:~$ net ipv4
IPv4 support                              : enabled
IPv4 fragmentation support                : disabled
Max number of IPv4 network interfaces in the system          : 1
Max number of unicast IPv4 addresses per network interface   : 1
Max number of multicast IPv4 addresses per network interface : 1

IPv4 addresses for interface 1 (0x3ffb2708) (Ethernet)
====================================================
Type            State           Lifetime (sec)  Address
DHCP    preferred       192.168.1.109/255.255.255.0
uart:~$ net arp
     Interface  Link              Address
[ 0] 1          A0:B5:49:B3:E5:B0 192.168.1.2