ardupilot/libraries/AP_HAL/RCInput.h

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#ifndef __AP_HAL_RC_INPUT_H__
#define __AP_HAL_RC_INPUT_H__
#include "AP_HAL_Namespace.h"
#define RC_INPUT_MIN_PULSEWIDTH 900
#define RC_INPUT_MAX_PULSEWIDTH 2100
class AP_HAL::RCInput {
public:
/**
* Call init from the platform hal instance init, so that both the type of
* the RCInput implementation and init argument (e.g. ISRRegistry) are
* known to the programmer. (Its too difficult to describe this dependency
* in the C++ type system.)
*/
virtual void init(void* implspecific) = 0;
/**
* Return the number of currently valid channels.
* Typically 0 (no valid radio channels) or 8 (implementation-defined)
* Could be less than or greater than 8 depending on your incoming radio
* or PPM stream
*/
virtual uint8_t valid() = 0;
/* Read a single channel at a time */
virtual uint16_t read(uint8_t ch) = 0;
/* Read an array of channels, return the valid count */
virtual uint8_t read(uint16_t* periods, uint8_t len) = 0;
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/**
* Overrides: these are really grody and don't belong here but we need
* them at the moment to make the port work.
* case v of:
* v == -1 -> no change to this channel
* v == 0 -> do not override this channel
* v > 0 -> set v as override.
*/
/* set_overrides: array starts at ch 0, for len channels */
virtual bool set_overrides(int16_t *overrides, uint8_t len) = 0;
/* set_override: set just a specific channel */
virtual bool set_override(uint8_t channel, int16_t override) = 0;
/* clear_overrides: equivelant to setting all overrides to 0 */
virtual void clear_overrides() = 0;
};
#endif // __AP_HAL_RC_INPUT_H__