diff --git a/libraries/AP_HAL_AVR/RCOutput.h b/libraries/AP_HAL_AVR/RCOutput.h
index df4e3c14d4..adbf71a940 100644
--- a/libraries/AP_HAL_AVR/RCOutput.h
+++ b/libraries/AP_HAL_AVR/RCOutput.h
@@ -7,18 +7,56 @@
 
 class AP_HAL_AVR::APM1RCOutput : public AP_HAL::RCOutput {
 public:
-    APM1RCOutput() : _init(0) {}
-    void init(int machtnicht) { _init = 1; }
-private:
-    int _init;
+    /* No init argument required */
+    void     init(void* machtnicht);
+
+    /* Output freq (1/period) control */
+    void     set_freq(uint32_t chmask, uint16_t freq_hz);
+    uint16_t get_freq(uint8_t ch);
+
+    /* Output active/highZ control, either by single channel at a time
+     * or a mask of channels */
+    void     enable_ch(uint8_t ch);
+    void     enable_mask(uint32_t chmask);
+
+    void     disable_ch(uint8_t ch);
+    void     disable_mask(uint32_t chmask);
+
+    /* Output, either single channel or bulk array of channels */
+    void     write(uint8_t ch, uint16_t period_ms);
+    void     write(uint8_t ch, uint16_t* period_ms, uint8_t len);
+
+    /* Read back current output state, as either single channel or
+     * array of channels. */
+    uint16_t read(uint8_t ch);
+    void     read(uint16_t* period_ms, uint8_t len);
 };
 
 class AP_HAL_AVR::APM2RCOutput : public AP_HAL::RCOutput {
 public:
-    APM2RCOutput() : _init(0) {}
-    void init(int machtnicht) { _init = 2; }
-private:
-    int _init;
+    /* No init argument required */
+    void     init(void* machtnicht);
+
+    /* Output freq (1/period) control */
+    void     set_freq(uint32_t chmask, uint16_t freq_hz);
+    uint16_t get_freq(uint8_t ch);
+
+    /* Output active/highZ control, either by single channel at a time
+     * or a mask of channels */
+    void     enable_ch(uint8_t ch);
+    void     enable_mask(uint32_t chmask);
+
+    void     disable_ch(uint8_t ch);
+    void     disable_mask(uint32_t chmask);
+
+    /* Output, either single channel or bulk array of channels */
+    void     write(uint8_t ch, uint16_t period_ms);
+    void     write(uint8_t ch, uint16_t* period_ms, uint8_t len);
+
+    /* Read back current output state, as either single channel or
+     * array of channels starting at 0. */
+    uint16_t read(uint8_t ch);
+    void     read(uint16_t* period_ms, uint8_t len);
 };
 
 #endif // __AP_HAL_AVR_RC_OUTPUT_H__
diff --git a/libraries/AP_HAL_AVR/RCOutput_APM1.cpp b/libraries/AP_HAL_AVR/RCOutput_APM1.cpp
new file mode 100644
index 0000000000..4888e8f6af
--- /dev/null
+++ b/libraries/AP_HAL_AVR/RCOutput_APM1.cpp
@@ -0,0 +1,59 @@
+
+#include <avr/interrupt.h>
+
+#include <AP_HAL_AVR.h>
+#include "RCOutput.h"
+using namespace AP_HAL_AVR;
+
+/* No init argument required */
+void APM1RCOutput::init(void* machtnicht) {
+
+}
+
+/* Output freq (1/period) control */
+void APM1RCOutput::set_freq(uint32_t chmask, uint16_t freq_hz) {
+
+}
+
+uint16_t APM1RCOutput::get_freq(uint8_t ch) {
+
+}
+
+/* Output active/highZ control, either by single channel at a time
+ * or a mask of channels */
+void APM1RCOutput::enable_ch(uint8_t ch) {
+    enable_mask(1 << ch);
+}
+
+void APM1RCOutput::enable_mask(uint32_t chmask) {
+
+}
+
+void APM1RCOutput::disable_ch(uint8_t ch) {
+    disable_mask(1 << ch);
+}
+
+void APM1RCOutput::disable_mask(uint32_t chmask) {
+
+}
+
+/* Output, either single channel or bulk array of channels */
+void APM1RCOutput::write(uint8_t ch, uint16_t period_ms) {
+
+}
+
+void APM1RCOutput::write(uint8_t ch, uint16_t* period_ms, uint8_t len) {
+
+}
+
+
+/* Read back current output state, as either single channel or
+ * array of channels. */
+uint16_t APM1RCOutput::read(uint8_t ch) {
+
+}
+
+void APM1RCOutput::read(uint16_t* period_ms, uint8_t len) {
+
+}
+
diff --git a/libraries/AP_HAL_AVR/RCOutput_APM2.cpp b/libraries/AP_HAL_AVR/RCOutput_APM2.cpp
new file mode 100644
index 0000000000..33c2455a08
--- /dev/null
+++ b/libraries/AP_HAL_AVR/RCOutput_APM2.cpp
@@ -0,0 +1,59 @@
+
+#include <avr/interrupt.h>
+
+#include <AP_HAL_AVR.h>
+#include "RCOutput.h"
+using namespace AP_HAL_AVR;
+
+/* No init argument required */
+void APM2RCOutput::init(void* machtnicht) {
+
+}
+
+/* Output freq (1/period) control */
+void APM2RCOutput::set_freq(uint32_t chmask, uint16_t freq_hz) {
+
+}
+
+uint16_t APM2RCOutput::get_freq(uint8_t ch) {
+
+}
+
+/* Output active/highZ control, either by single channel at a time
+ * or a mask of channels */
+void APM2RCOutput::enable_ch(uint8_t ch) {
+    enable_mask(1 << ch);
+}
+
+void APM2RCOutput::enable_mask(uint32_t chmask) {
+
+}
+
+void APM2RCOutput::disable_ch(uint8_t ch) {
+    disable_mask(1 << ch);
+}
+
+void APM2RCOutput::disable_mask(uint32_t chmask) {
+
+}
+
+/* Output, either single channel or bulk array of channels */
+void APM2RCOutput::write(uint8_t ch, uint16_t period_ms) {
+
+}
+
+void APM2RCOutput::write(uint8_t ch, uint16_t* period_ms, uint8_t len) {
+
+}
+
+
+/* Read back current output state, as either single channel or
+ * array of channels. */
+uint16_t APM2RCOutput::read(uint8_t ch) {
+
+}
+
+void APM2RCOutput::read(uint16_t* period_ms, uint8_t len) {
+
+}
+