LXSAMD21DMX with Adafruit_NeoPixel issue on Seeed XIAO

[Shuptuu]

Hi,
Looks like there's an incompatibility between LXSAMD21DMX and Adafruit_NeoPixel on Seeed Xiao Samd21.
They're both independently working but together, LXSAMD21DMX is not able to get slot values. DMX messages are received, but all slot values are stuck to 0 as soon as there's a call to strip.show(). (if you comment the strip.show() line, values are correctly received)
Could it be they're using the same timer?

Code used:

#include <LXSAMD21DMX.h>
#include <Adafruit_NeoPixel.h>

#define DMX_INPUT_PIN  D3
#define LED_PIN       A1

#define LED_COUNT     53
// NeoPixel brightness, 0 (min) to 255 (max)
#define BRIGHTNESS 50 // Set BRIGHTNESS to about 1/5 (max = 255)

// Declare our NeoPixel strip object:
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_RGBW + NEO_KHZ800);
// Argument 1 = Number of pixels in NeoPixel strip
// Argument 2 = Arduino pin number (most are valid)
// Argument 3 = Pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
//   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)

int got_dmx = 0;

void setup() {
  Serial.begin(115200);
  Serial.println("Hello!");

  strip.begin();           // INITIALIZE NeoPixel strip object (REQUIRED)
  strip.show();            // Turn OFF all pixels ASAP
  strip.setBrightness(BRIGHTNESS);

  strip.setPixelColor(0,strip.Color(100,100,100,100));  // just to check Neopixel is ok
  strip.show();
  

  SAMD21DMX.setDataReceivedCallback(&gotDMXCallback);
  SAMD21DMX.startInput();

  
}

// ***************** input callback function *************

void gotDMXCallback(int slots) {
  got_dmx = slots;
}

void loop() {
  if (got_dmx){
    for (int i=0;i<LED_COUNT;i++){
      int startid=i*4+1;
      strip.setPixelColor(i, strip.Color(SAMD21DMX.getSlot(startid), SAMD21DMX.getSlot(startid+1), SAMD21DMX.getSlot(startid+2), SAMD21DMX.getSlot(startid+3)));
    }
    strip.show();
    Serial.println(SAMD21DMX.getSlot(1));
    got_dmx = 0;
  }
}

[Shuptuu]

Adding a delay(100) just after the strip.show() seems to fix the problem...