main.cpp

00001 #include "mbed.h"
00002 #include "neopixel.h"
00003 
00004 // This must be an SPI MOSI pin.
00005 #define DATA_PIN p5
00006 
00007 void generate(neopixel::Pixel * out, uint32_t index, uintptr_t extra)
00008 {
00009     uint32_t brightness = (index + extra) >> 3;
00010     out->red   = ((index + extra) & 0x1) ? brightness : 0;
00011     out->green = ((index + extra) & 0x2) ? brightness : 0;
00012     out->blue  = ((index + extra) & 0x4) ? brightness : 0;
00013 }
00014 
00015 int main()
00016 {
00017     // Create a temporary DigitalIn so we can configure the pull-down resistor.
00018     // (The mbed API doesn't provide any other way to do this.)
00019     // An alternative is to connect an external pull-down resistor.
00020     DigitalIn(DATA_PIN, PullDown);
00021 
00022     // The pixel array control class.
00023     neopixel::PixelArray array(DATA_PIN);
00024 
00025     uint32_t offset = 0;
00026     while (1) {
00027         array.update(generate, 100, offset++);
00028         wait_ms(250);
00029     }
00030 }