//
// hello.D11C.blink.ino
//
// SAMD11C LED blink hello-world
//
// Neil Gershenfeld 11/29/19
//
// This work may be reproduced, modified, distributed,
// performed, and displayed for any purpose. Copyright is
// retained and must be preserved. The work is provided
// as is; no warranty is provided, and users accept all 
// liability.
//

#define LED (1 << 5) // define LED ping

void setup() {
   SYSCTRL->OSC8M.bit.PRESC = 0; // set OSC8M clock prescaler to 1
   REG_PORT_DIR0 |= LED; // set LED pin to output
   }

void loop() {
   REG_PORT_OUT0 |= LED; // turn on LED
   delay(100); // delay
   REG_PORT_OUT0 &= ~LED; // turn off LED
   delay(100); // delay
   }