Teensy 3.5 and APA102

[dimitre]

I'm experimenting with a brand new Teensy 3.5 to see which ports I can use to drive independent APA102 strips.
FastLED is not able to handle yet ports > 23 but Adafruit_Dotstar does.

I don't know if I'm doing it right but I've tried to make an array of Adafruit_DotStar, and I'm able to drive 3 different APA102 ports at the same time, maximum.

Any ideas?

#define NUM_LEDS 72

int nPortas = 3;

typedef struct  {
  byte d;
  byte c;
} dataClock;

dataClock ports[19] =  {
  { 2, 3 },
  { 4, 5 },
//  { 6, 7 },
  { 8, 9 },
  //{ 10, 11 },
  { 12, 13 },
  { 14, 15 },
  { 16, 17 },
  { 18, 19 },
  { 20, 21 },
  { 22, 23 },
  { 24, 25 },
  { 26, 27 },
  { 28, 29 },
  { 30, 31 },
  { 32, 33 },
  { 34, 35 },
  { 36, 37 },
  { 38, 39 }
};


#include <Adafruit_DotStar.h>
#include <SPI.h>

Adafruit_DotStar s[3] = Adafruit_DotStar(NUM_LEDS);
//Adafruit_DotStar s[3] = Adafruit_DotStar(NUM_LEDS, DATA_PIN, CLOCK_PIN, DOTSTAR_BGR);

float contagem = 0;

void setup() {
  Serial.begin(9600);
  for (int a = 0; a < nPortas; a++) {
    s[a].begin();
    s[a].updatePins(ports[a].d, ports[a].c);
    s[a].show();
    s[a].setBrightness(75);

  }
}

void loop() {
  contagem += .2;
  for (int i = 0; i < NUM_LEDS; i++) {
    float alpha =  constrain(sin(contagem * .1 + i * .02) * 2 + 1.0, 0, 1);
    uint8_t r = sin(contagem * .5 + i * .09) * 127.0 + 127.0;
    uint8_t g = sin(contagem * .6 + i * .011) * 127.0 + 127.0;
    uint8_t b = sin(contagem * .7 + i * .013) * 127.0 + 127.0;
    for (int a = 0; a < nPortas; a++) {
      s[a].setPixelColor(i, r * alpha , g * alpha, b * alpha);
    }

  }

  for (int a = 0; a < nPortas; a++) {
    s[a].show();
  }

  delay(33);
}