gp2.h

#ifndef _SYSIO_GP2_H_
#define _SYSIO_GP2_H_

#include <sysio/defs.h>
#ifdef __cplusplus
  extern "C" {
#endif
/* ========================================================================== */

/* constants ================================================================ */
#define GP2I2C_I2CADDR  0x46

/* structures =============================================================== */
struct xG2pSetting {
  double dD1; 
  double dV1; 
  double dD2; 
  double dV2; 
};
typedef struct xG2pSetting xG2pSetting;

struct xG2pSensor;
typedef struct xG2pSensor xG2pSensor;

/* internal public functions ================================================ */
xG2pSensor * xGp2Open (const char * sI2cBus, int iI2cAddr, const xG2pSetting * xSetting);

int iGp2Close (xG2pSensor * xSensor);

void vGp2SetSetting (xG2pSensor * xSensor, const xG2pSetting * xSetting);

int iGp2ReadVoltage (xG2pSensor * xSensor);

int iGp2Read (xG2pSensor * xSensor);

int iGp2VoltageToDensity (int iVoltage, const xG2pSetting * xSetting);

/* ========================================================================== */
#ifdef __cplusplus
  }
#endif
#endif /* _SYSIO_GP2_H_ defined */