fix typo, mixed refs

sorry to do this twice - just noticed the page was a bit mixed up

gpio/m0/m0_port/m0_port.ino

 /*
    I found most of these definitions in the arduino cores in
    AppData/Local/Arduino15/packages/adafruit/hardware/samd/1.0.19/cores/arduino/wiring_digital.c & wiring_digital.h
+   also samd/1.0.19/variants/variant.h and variant.cpp and pins_arduino.h
 */
 
-#define PIN_LED_PORT 0
-#define PIN_LED_PIN 17
-
 #define PIN_10_PORT 0
 #define PIN_10_PIN 18
 
 #define PIN_11_PORT 0
 #define PIN_11_PIN 16
 
-uint32_t ulPin = 11;
+#define RING_PORT_OUTSET PORT->Group[PIN_10_PORT].OUTSET.reg
+#define RING_PORT_OUTCLR PORT->Group[PIN_10_PORT].OUTCLR.reg
+#define RING_PORT_OUT_MASK (1UL << PIN_10_PIN)
+
+#define RING_PORT_IN PORT->Group[PIN_11_PORT].IN.reg
+#define RING_PORT_IN_MASK (1UL << PIN_11_PIN)
 
 void setup() {
-  // set a pin to in / out ... starting
-  PORT->Group[g_APinDescription[ulPin].ulPort].PINCFG[g_APinDescription[ulPin].ulPin].reg = (uint8_t)(PORT_PINCFG_INEN) ;
-  PORT->Group[g_APinDescription[ulPin].ulPort].DIRSET.reg = (uint32_t)(1 << g_APinDescription[ulPin].ulPin) ;
+  // set 10 to output
+  PORT->Group[PIN_10_PORT].DIRSET.reg = (uint32_t)(1 << PIN_10_PIN);
 
-  //pinMode(10, OUTPUT);
-  //pinMode(11, INPUT);
+  // set 11 to input
+  PORT->Group[PIN_11_PORT].PINCFG[PIN_11_PIN].reg = (uint8_t)(PORT_PINCFG_INEN);
 
+  // do loop
+  while (1) { // no loop just c
+    RING_PORT_IN & RING_PORT_IN_MASK ? RING_PORT_OUTCLR = RING_PORT_OUT_MASK : RING_PORT_OUTSET = RING_PORT_OUT_MASK;
+  }
 }
 
 void loop() {
-  EPortType port = g_APinDescription[ulPin].ulPort;
-  uint32_t pin = g_APinDescription[ulPin].ulPin;
-  uint32_t pinMask = (1ul << pin);
-
-  Serial.print("11, port: ");
-  Serial.print(port);
-  Serial.print(" pin: ");
-  Serial.print(pin);
-  Serial.println("");
-  PORT->Group[port].OUTSET.reg = pinMask;
-  delay(100);
-  PORT->Group[port].OUTCLR.reg = pinMask;
-  delay(100);
+
 }