DotStarのライブラリを作ったよ。

DotStarのライブラリを作ったよ。

GitHub - TomiXRM/APA102-DotStar-for-Mbed: library for using DotStar with Mbed!!

This is the library for using DotStar(APA102) with Mbed. thankyou for your looking this Library!! This is very simple library for using Dotstar. DotStar is Serial Controlable LED.You can use SPI. But you don't have to use all pin(MOSI,MISO,SCK and SSEL),only choose two wire MOSI(MasterOutSlaveIn) and SCK(SerialClocK).

https://github.com/TomiXRM/APA102-DotStar-for-Mbed

//LGDotStar.h

#ifndef LGDOTSTAR_H
#define LGDOTSTAR_H
#define LED_FREQ 800000 // spi

#include "mbed.h"


class LGDotStar {
public:
LGDotStar(PinName mosi,PinName sck,uint8_t lednumber);
void set(uint8_t r,uint8_t g,uint8_t b,uint8_t n);
void write();
void write(uint8_t groval);
private:
SPI spi;
uint8_t *red;
uint8_t *green;
uint8_t *blue;
uint8_t led_num;
};

#endif

LGDotStar.cpp

#include "LGDotStar.h"

LGDotStar::LGDotStar(PinName mosi,PinName sck,uint8_t n) : spi(mosi,NC,sck){
        spi.frequency(LED_FREQ);
        red = new uint8_t[n];
        green = new uint8_t[n];
        blue = new uint8_t[n];
        led_num = n;
        for (size_t i = 0; i < led_num; i++) {
                red[i] = 0; green[i] = 0; blue[i] = 0;
        }
        write();
}
void LGDotStar::set(uint8_t r,uint8_t g,uint8_t b,uint8_t n){
        red[n] = r; green[n] = g; blue[n] = b;
}
void LGDotStar::write(){
        uint8_t i;
        // start frame
        for (i = 0; i < 4; i++) {
                spi.write(0);
        }
        for (i = 0; i < led_num; i++) {
                spi.write(255);
                spi.write(blue[i]);  // B
                spi.write(green[i]);  // G
                spi.write(red[i]);   // R
        }
        // end frame
        for(i = 0; i<4; i++) {
                spi.write(1);
        }

}
void LGDotStar::write(uint8_t groval_brightness ){
        // groval_brightness(0~31)
        uint8_t i;
        // start frame
        for (i = 0; i < 4; i++) {
                spi.write(0);
        }
        for (i = 0; i < led_num; i++) {
                spi.write((7<<5)|groval_brightness);
                spi.write(blue[i]); // B
                spi.write(green[i]); // G
                spi.write(red[i]); // R
        }
        // end frame
        for(i = 0; i<4; i++) {
                spi.write(1);
        }
}

今回のメイン,配列の要素数の決定について

uint8_t *red;

要素数の決定

red = new uint8_t[n];//nは要素数

// サンプルプログラム

#include  "mbed.h"
#include  "LGDotStar.h"
LGDotStar LED(D11,D13,4);
int main(){
        while (1) {
                LED.set(255,0,255,0);
                LED.set(255,255,255,1);
                LED.set(255,255,0,2);
                LED.set(0,255,255,3);
                LED.write(31);
        }
}