orsala_hack

https://github.com/j-zero/orsala_hack

Alternative firmware for IKEA ORSALA lamp (https://www.ikea.com/de/de/p/orsala-arbeitsleuchte-led-dimmbar-weiss-00482904/)

but why?

The ORSALA lamp from IKEA is a nice desktop lamp but has a very strange user experience. It features one rotary encoeder with button to control the brightness, color temperature and an on/off switch.

On the original firmware the following functions are implemented:

If lamp is turned off:

Tap the encoder to turn on the lamp.

If lamp is turned on:

Press the encoder for about 750ms to turn off the lamp.
Tap the rotary encoder to switch between brightness and temperature control.
Turn the rotary encoder in to change brightness or color temperature according to the current mode.

Also the lamp does not save the brightness or color temperature on power loss.

This firmware fixes the user experience in the following way:

If lamp is turned off:

Tap the rotary encoder to turn on the Lamp
Turn the rotary encoder clockwise to turn on the lamp

If lamp is turned on:

Tap the rotary encoder to turn off the lamp
Turn rotary encoder to change the brightness
Turn the rotary encoder below minimum brightness to turn off the lamp
Press and turn the rotary encoder to change color temperature
Internal LED flashes if minimum/maximum temperature/brightness is reached

The current color and brightness is saved in EEPROM on power off the lamp.

Information

The IKEA ORSALA lamp contains a STM8S003F3P6 (https://www.st.com/resource/en/datasheet/stm8s003f3.pdf) cpu and two TTP932 led drivers for the warm and cold white leds.
The SWIM Interface is lead out to pads with 2mm spacing:

SWIM Interface
CPU

+    VSS     (VCC)      3.3V on STLINKv2
R    NRST    (Reset)    RST  on STLINKv2
S    SWIM    (SWIM)     SWIM on STLINKv2
-    VDD     (GND)      GND  on STLINKv2

Pinout

PD4   internal led
PA3   warm white leds (via TTP932)
PD3   cold white leds (via TTP932)
PA1   encoder pin 1
PA2   encoder pin 2
PB5   encoder button

Requirements

Build

Sduino Arduino API Ports to STM8S https://tenbaht.github.io/sduino/

Flash

stm8flash (https://github.com/tenbaht/stm8flash/)

STLINKv2 (https://www.st.com/en/development-tools/st-link-v2.html)

Flash firmware

Connect your STLINKv2 to the pads on the pcb (VCC is not needed if lamp is powered)

Flash firmware:

./stm8flash -c stlinkv2 -p stm8s003f3 -w orsala_hack.hex