Yes, thanks all, Henrik is correct.


I can drive the pin low. I was losing confidence when TOGGLE did not blink. I just did not think about the need of TOGGLE to read the state of an analog pin to blink an LED.


The Olimex board came with LED hardwired to PORTA.0 I am doing ADC on 6 other A/E ports (replacing cadmium sulfide photoresistors with more durable phototransistors in eyes of solar dish trackers) (also replacing expensive pulse/I2C tilt accelerometers with cheaper analogs).


I can make the LED blink by adding 1 to a tracking bit and not use TOGGLE in this instance. I doubt the need for an LED on solar dish PC boards. PORTA.0 will be liberated. Thanks again -- Doug.


P.S. You can see progress -- Google -- matrix solar dish