AP_HAL: proper RCOutput interface specification

libraries/AP_HAL/RCOutput.h

@@ -6,8 +6,28 @@
 
 class AP_HAL::RCOutput {
 public:
-    RCOutput() {}
-    virtual void init(int machtnicht) = 0;
+    virtual void init(void* implspecific) = 0;
+
+    /* Output freq (1/period) control */
+    virtual void     set_freq(uint32_t chmask, uint16_t freq_hz) = 0;
+    virtual uint16_t get_freq(uint8_t ch) = 0;
+
+    /* Output active/highZ control, either by single channel at a time
+     * or a mask of channels */
+    virtual void     enable_ch(uint8_t ch) = 0;
+    virtual void     enable_mask(uint32_t chmask) = 0;
+
+    virtual void     disable_ch(uint8_t ch) = 0;
+    virtual void     disable_mask(uint32_t chmask) = 0;
+
+    /* Output, either single channel or bulk array of channels */
+    virtual void     write(uint8_t ch, uint16_t period_ms) = 0;
+    virtual void     write(uint8_t ch, uint16_t* period_ms, uint8_t len) = 0;
+
+    /* Read back current output state, as either single channel or
+     * array of channels. */
+    virtual uint16_t read(uint8_t ch) = 0;
+    virtual void     read(uint16_t* period_ms, uint8_t len) = 0;
 };
 
 #endif // __AP_HAL_RC_OUTPUT_H__