Example usage for StuffAndyMakes.com Simple LED Controller shift register breakout board

SAM_LED_Controller.cpp

#include "mbed.h"


DigitalOut data(PTB9);
DigitalOut clk(PTB8);
DigitalOut oe(PTB10);
DigitalOut rst(PTB11);

Serial out(PTA2, PTA1);


void pulseClock() {
    clk = 1;
    clk = 0;
}

void setLEDs(uint8_t leds) {
    // reset chip
    rst = 0;
    rst = 1;
    // if set to 0, just bombo out, since all LEDs are off at this point
    if (leds == 0) return;
    // turn off display (active low)
    oe = 1;
    // shift in bits
    for (uint8_t bit = 0; bit < 8; bit++) {
        data = (leds & (1 << bit)) == (1 << bit) ? 1 : 0;
        pulseClock();
    }
    pulseClock();
    // turn on display (active low)
    oe = 0;
}

void setup() {
    out.printf("Hi!\r\n");
}

void loop() {
    uint8_t a = 0;
    while (a != 255) {
        a = (a << 1) + 1;
        setLEDs(a);
        wait_ms(100);
    }
    while (a != 0) {
        a = (a << 1);
        setLEDs(a);
        wait_ms(100);
    };
}