I got the SAMD21 Mini Breakout today and got the Adafruit Ultimate GPS to work with it.
Now I need it to work with the Adafruit Micro-SD Breakout board+, how do I connect it? I dont se any SPI pins.
The D21 has modules that can be configured for either UART, I2C or SPI; these are labeled “SERCOM” or abbreviated something along the lines of “SER” so theoretically, almost any of the pins on the board can be configured for SPI. I’m not familiar with the Arduino IDE for the D21 but it looks like the D10-D12 are the designated SPI pins. Try those pins using the SPI library for your board.
Got it working. I used D10 to D13 to make it work 
Was also able to make it perform 3 task at the same time using scheduler