Merge 11f5e8b733 into d98eafb11a

examples/DDS/DDS.ino

@@ -8,6 +8,12 @@
 #define RESET_PIN A3
 #define SWITCH_PIN 2
 
+#ifdef __SAMD21G18A__
+// NOTE: this won't really work for the Ardiuno Zero, as it will be playing its tones
+// out of AO, rather than D3 or D11.  Hook up your oscilloscope to A0 to see the waveform.
+#warning Hamshield may not be compatible with the Arduino Zero.
+#endif
+
 HamShield radio;
 DDS dds;
 
@@ -41,6 +47,31 @@ void loop() {
   delay(1000);
 }
 
+#ifdef __SAMD21G18A__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// ISR for the Arduino Zero Timer/Counter 5
+// DDS configures this to run at 44100 (default)
+void DDS_Handler (void) {
+    // Do the thing
+    dds.clockTick();
+
+    // Clear the interrupt
+    TC5->COUNT16.INTFLAG.bit.MC0 = 1;
+}
+
+void TC5_Handler (void) __attribute__ ((weak, alias("DDS_Handler")));
+
+#ifdef __cplusplus
+}
+#endif
+
+#else
+// Standard AVR ISRs
+
 #ifdef DDS_USE_ONLY_TIMER2
 ISR(TIMER2_OVF_vect) {
   dds.clockTick();
@@ -54,4 +85,7 @@ ISR(ADC_vect) {
   }
   dds.clockTick();
 }
-#endif
+#endif /* DDS_USE_ONLY_TIMER2 */
+
+#endif /* __SAMD21G18A__ */
+