add examples

examples/AD568X_sinus/AD568X_sinus.ino

@@ -0,0 +1,42 @@
+//
+//    FILE: AD568X_demo.ino
+//  AUTHOR: Rob Tillaart
+// PUPROSE: test basic behaviour and performance
+
+
+#include "AD568X.h"
+
+AD5683 AD16_HW(8);
+AD5683 AD16_SW(9, 10, 11);
+
+float frequency = 100.0;
+float amplitude = 32768;  //  50% of 16 bits
+
+void setup()
+{
+  Serial.begin(115200);
+  Serial.println();
+  Serial.println(__FILE__);
+  Serial.print("AD568X_LIB_VERSION: ");
+  Serial.println(AD568X_LIB_VERSION);
+
+  AD16_HW.begin();
+  AD16_SW.begin();
+
+  Serial.print("HWSPI: ");
+  Serial.println(AD16_HW.usesHWSPI());
+  Serial.print("HWSPI: ");
+  Serial.println(AD16_SW.usesHWSPI());
+}
+
+
+void loop()
+{
+  float phase  = fmod(micros() * (frequency * (TWO_PI * 1e-6)), TWO_PI);
+  float x = (1 + sin(phase)) * amplitude;
+  AD16_HW.setValue(x);
+  //  Serial.println(x);  //  test
+}
+
+
+//  -- END OF FILE --