File content as of revision 0:fab321797d4b:

/**
 * @file SeeedChainableLED.h
 * @brief control the chainable LED module from Seeed Studios
 * @author Nathan Yonkee
 * @version 1.0
 * @date 2017-04-20
 */
#ifndef SEEED_CHAINABLE_LED_H
#define SEEED_CHAINABLE_LED_H
#include "mbed.h"
#include "DataClockPair.h"

class SeeedChainableLED {
  private:
    DigitalOut datPin_;
    DigitalOut clkPin_;
    void start_cmd();
    void stop_cmd();
    void pin_delay(int delay_us = 6);
    void send_byte(int byte);
    void send_color(int r, int g, int b);
  public:
    void set_color_rgb(int r, int g, int b, int led = 0);
    void clear_led();
    void turn_on();
    SeeedChainableLED (DataClockPair pins);
};

SeeedChainableLED::SeeedChainableLED(DataClockPair pins) : datPin_(pins.dataPin), clkPin_(pins.clockPin) {
    clear_led();
}

void SeeedChainableLED::start_cmd() {
    send_byte(0x00);
    send_byte(0x00);
    send_byte(0x00);
    send_byte(0x00);
}

void SeeedChainableLED::stop_cmd() {
    start_cmd();
}

void SeeedChainableLED::clear_led() {
    set_color_rgb(0,0,0);
}

void SeeedChainableLED::turn_on() {
    set_color_rgb(255,255,255);
}

void SeeedChainableLED::pin_delay(int delay_us) {
    wait_us(delay_us);
}

void SeeedChainableLED::set_color_rgb(int r, int g, int b, int led) {
    start_cmd();
    send_color(r, g, b);
    stop_cmd();
}

void SeeedChainableLED::send_color(int red, int green, int blue) {
    // Start by sending a byte with the format "1 1 /B7 /B6 /G7 /G6 /R7 /R6"
    int prefix = 0b11000000;
    if ((blue & 0x80) == 0)     prefix|= 0b00100000;
    if ((blue & 0x40) == 0)     prefix|= 0b00010000;
    if ((green & 0x80) == 0)    prefix|= 0b00001000;
    if ((green & 0x40) == 0)    prefix|= 0b00000100;
    if ((red & 0x80) == 0)      prefix|= 0b00000010;
    if ((red & 0x40) == 0)      prefix|= 0b00000001;
    send_byte(prefix);
    // Now send the 3 colors
    send_byte(blue);
    send_byte(green);
    send_byte(red);
}

void SeeedChainableLED::send_byte(int byte) {
    for (int i = 0; i < 8; i++) {
        pin_delay();
        datPin_ = byte & 0x80;
        byte <<= 1;
        clkPin_ = 0;
        pin_delay();
        clkPin_ = 1;
    }
}

#endif