diff --git a/src/HamShield.cpp b/src/HamShield.cpp
index de13b40..2078b60 100644
--- a/src/HamShield.cpp
+++ b/src/HamShield.cpp
@@ -125,7 +125,7 @@ const unsigned char AFSK_space[] PROGMEM = { 140, 228, 250, 166, 53, 0, 53, 166,
  * @see A1846S_ADDRESS_AD0_LOW
  * @see A1846S_ADDRESS_AD0_HIGH
  */
-HamShield::HamShield(uint8_t ncs_pin = nCS, uint8_t clk_pin = CLK, uint8_t dat_pin = DAT, uint8_t mic_pin = MIC) {
+HamShield::HamShield(uint8_t ncs_pin, uint8_t clk_pin, uint8_t dat_pin, uint8_t mic_pin) {
     devAddr = ncs_pin;
     hs_mic_pin = mic_pin;
     
diff --git a/src/HamShield.h b/src/HamShield.h
index c7fe0eb..b520e04 100644
--- a/src/HamShield.h
+++ b/src/HamShield.h
@@ -240,14 +240,16 @@ class HamShield {
         bool frequency_float(float freq_khz);
 		uint32_t getFrequency();
 		float getFrequency_float();
-			
+		
+                /* ToDo	
 		// channel mode
 		// 11 - 25kHz channel
 		// 00 - 12.5kHz channel
 		// 10,01 - reserved
 		void setChanMode(uint16_t mode);
 		uint16_t getChanMode();
-		
+		*/
+	
 		void setModeTransmit(); // turn off rx, turn on tx
 		void setModeReceive(); // turn on rx, turn off tx
 		void setModeOff(); // turn off rx, turn off tx, set pwr_dwn bit
@@ -265,6 +267,7 @@ class HamShield {
 		void setTxSourceNone();
 		uint16_t getTxSource();
 		
+		/*
 		// PA bias voltage is unused (maybe remove this)
 		// set PA_bias voltage
 		//    000000: 1.01V
@@ -277,6 +280,7 @@ class HamShield {
 		//    1111111:3.13V
 		void setPABiasVoltage(uint16_t voltage);
 		uint16_t getPABiasVoltage();
+		*/
 		
 		// Subaudio settings
 		
@@ -475,9 +479,7 @@ class HamShield {
         uint32_t findWhitespace(uint32_t start,uint32_t stop, uint8_t dwell, uint16_t step, uint16_t threshold);
         uint32_t scanChannels(uint32_t buffer[],uint8_t buffsize, uint8_t speed, uint16_t threshold);
         uint32_t findWhitespaceChannels(uint32_t buffer[],uint8_t buffsize, uint8_t dwell, uint16_t threshold);
-        void buttonMode(uint8_t mode);
-        static void isr_ptt();
-        static void isr_reset();
+
 		unsigned int getMorseFreq();
 		void setMorseFreq(unsigned int morse_freq_hz);
 		unsigned int getMorseDotMillis();
diff --git a/src/HamShield_comms.cpp b/src/HamShield_comms.cpp
index a9ace46..0c66803 100644
--- a/src/HamShield_comms.cpp
+++ b/src/HamShield_comms.cpp
@@ -4,10 +4,6 @@
 
 #include "HamShield_comms.h"
 
-
-#include "Arduino.h"
-//#include "I2Cdev.h"
-
 uint8_t ncs_pin = nCS;
 uint8_t clk_pin = CLK;
 uint8_t dat_pin = DAT;
@@ -16,6 +12,10 @@ void HSsetPins(uint8_t ncs, uint8_t clk, uint8_t dat) {
     ncs_pin = ncs;
     clk_pin = clk;
     dat_pin = dat;
+
+#if !defined(ARDUINO)    
+    wiringPiSetup();
+#endif
     
     pinMode(ncs_pin, OUTPUT);
     digitalWrite(ncs_pin, HIGH);
@@ -147,11 +147,21 @@ void HSdelayMicroseconds(unsigned int us) {
 }
 
 void HStone(uint8_t pin, unsigned int frequency) {
+#if defined(ARDUINO_ARCH_NRF52)
+//TODO
+#elif defined(ARDUINO)
     tone(pin, frequency);
-}
-void HStone(uint8_t pin, unsigned int frequency, unsigned long duration) {
-    tone(pin, frequency, duration);
+#else
+    softToneCreate(pin);
+    softToneWrite(pin, frequency);
+#endif
 }
 void HSnoTone(uint8_t pin) {
+#if defined(ARDUINO_ARCH_NRF52)
+//TODO
+#elif defined(ARDUINO)
     noTone(pin);
+#else
+    softToneWrite(pin, 0);
+#endif
 }
\ No newline at end of file
diff --git a/src/HamShield_comms.h b/src/HamShield_comms.h
index 43f57fc..f4dc017 100644
--- a/src/HamShield_comms.h
+++ b/src/HamShield_comms.h
@@ -4,13 +4,24 @@
 #ifndef _HAMSHIELD_COMMS_H_
 #define _HAMSHIELD_COMMS_H_
 
-#include "stdint.h"
 
+#if defined(ARDUINO)
 #include "Arduino.h"
+
 #define nCS A1 //15 //
 #define CLK A5 //19 //
 #define DAT A4 //18 //
-#define MIC 3    // Pin assignment for PWM output
+#define MIC 3
+#else // assume Raspberry Pi
+#include "stdint.h"
+#include <wiringPi.h>
+#include <softTone.h>
+
+#define nCS 0 //BCM17, HW pin 11 
+#define CLK 3 //BCM22, HW pin 15 
+#define DAT 2 //BCM27, HW pin 13 
+#define MIC 1 //BCM18, HW pin 12
+#endif
 
 
 void HSsetPins(uint8_t ncs, uint8_t clk, uint8_t dat);
@@ -31,8 +42,7 @@ void HSdelay(unsigned long ms);
 void HSdelayMicroseconds(unsigned int us);
 
 void HStone(uint8_t pin, unsigned int frequency);
-void HStone(uint8_t pin, unsigned int frequency, unsigned long duration);
 void HSnoTone(uint8_t pin);
 
 
-#endif /* _HAMSHIELD_COMMS_H_ */
\ No newline at end of file
+#endif /* _HAMSHIELD_COMMS_H_ */