LPD6803 driver for AVR

gistfile1.c

typedef unsigned char byte;

#define STRIP_DDR  DDRD
#define STRIP_PORT PORTD
#define STRIP_DAT  (1 << 2)
#define STRIP_CLK  (1 << 3)

// Set up the interface at boot.
inline void setup_strip() {
    STRIP_DDR |= (STRIP_DAT | STRIP_CLK);
}

// Write a single bit to the LED strip.
inline void write_bit(byte x) {
    if (x)
        STRIP_PORT |= STRIP_DAT;
    else
        STRIP_PORT &= ~STRIP_DAT;

    STRIP_PORT |= STRIP_CLK;
    STRIP_PORT &= ~STRIP_CLK;
}

// Write five bits to the LED strip.
inline void write5(byte x) {
    write_bit(x & 0x10);
    write_bit(x & 0x08);
    write_bit(x & 0x04);
    write_bit(x & 0x02);
    write_bit(x & 0x01);
}

// Start a new frame.
inline void frame_start() {
    for (byte i=0; i<32; i++) {
        write_bit(0);
    }
}

// Set a RGB color.
inline void rgb(byte r, byte g, byte b) {
    write_bit(1);
    write5(g);
    write5(r);
    write5(b);
}