Major update. Finaly managed to fix some nasty timing and stack bugs. Check out source for changes.

The whole setup

The system is currently running 8 tasks:

• A heatbeat LED
• HSV to RGB converter and PWM feeder
• 3 PWM tasks for each color of RGB-LED
• 3-wire-driver for LCD-display
• a clock and diagnostics printing task
• and finaly ADC reader for a photoresistor

There are up to 12–16 tasks possible.

The 3-wire-interface to HD44780 is implemented with 74HC164 serial-to-parallel shift register.

The photoresitor drives saturation and value for HSV conversion.

The cable at the bottom of picture is a UART interface. It is used to reset the chip, to program it on the fly and to take a memory snapshots of running system.

The system is quite stable. It happend to run for several weeks without any crashes or glitches.