File content as of revision 22:abfed71656bd:

#include "mbed.h"
#include "WS2811.h"
#include "Colors.h"

// per LED: 3x 20 mA = 60mA
// 4x full brightness = 0.33A at 5V.
unsigned const nLEDs = MAX_LEDS_PER_STRIP;

// I/O pin usage
// PTD0 TPM0 CH0 monitor
// PTD1 TPM0 CH1 monitor
// PTD2 data output
// PTD3 debug output

unsigned const DATA_OUT_PIN = 2; // PTD2

Serial pc(USBTX, USBRX);

// @brief sets different colors in each of the LEDs of a strip
// @param strip the light strip
// @param sat saturation, 0.0 - 1.0
// @param brite brightness, 0.0 - 1.0
// @param hueShift shift, 0.0 - 1.0 is equivalent to 0 - 360 degrees
static void showRainbow(WS2811 &strip, float sat, float brite, float hueShift)
{
    unsigned nLEDs = strip.numPixels();
    for (unsigned i = 0; i < nLEDs; i++) {
        uint8_t r, g, b;
        float hue = ((float)i / (float)nLEDs) + hueShift;
        HSBtoRGB(hue, sat, brite, &r, &g, &b);
        strip.setPixelColor(i, LedStrip::Color(r, g, b));
    }
    strip.show();
}

static void showTestPattern(WS2811 &strip)
{
    unsigned nLEDs = strip.numPixels();
    for (unsigned i = 0; i < nLEDs; i++)
    {
        strip.setPixelColor(i, LedStrip::Color(0xff,0,0xAA));
    }
    strip.show();
}

int main(void)
{
    pc.baud(115200);
    pc.printf("\r\nLEDs: %d\r\n", nLEDs);

    WS2811 lightStrip(nLEDs, DATA_OUT_PIN);

    lightStrip.begin();

    float sat = 1.0;    // color saturation, 0.0 to 1.0
    float brite = 0.1;  // 1.0 is full brightness, which is VERY bright!
    float hueShift = 0.0;
    float hueShiftIncrement = 1.0 / (360.0 / nLEDs);

    Timer advance;
    advance.start();

    for (;;) {
        advance.reset();

        // showTestPattern(lightStrip);
        showRainbow(lightStrip, sat, brite, hueShift);
        hueShift += hueShiftIncrement;

        while (advance.read_ms() < 100)
            __NOP();
   }
}