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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@George
The LEDs are fine. I connected data line to Arduino and launched Adafruit's Neopixel demo sketch. Everything works beautifully.
I don't think SPI is the only way to run Neopixels with STM32. Basically, SPI is sending 4x more data at 4x more speed to mimic the LED's protocol. Does Espruino allow controlling a pin with a CPU directly with tiny timings, like: "set HIGH to the pin, wait for 450 nanoseconds, set LOW etc.." or it is a too low-level task?