PCF8591.hh

Go to the documentation of this file.

#ifndef COSA_PCF8591_HH
#define COSA_PCF8591_HH

#include "Cosa/TWI.hh"

class PCF8591 : private TWI::Driver {
public:
  enum {
    AIN0 = 0x00,
    AIN1 = 0x01,
    AIN2 = 0x02,
    AIN3 = 0x03,
    CHANNEL_MASK = 0x03,
    AUTO_INCREMENT = 0x04,
    FOUR_INPUTS = 0x00,
    THREE_DIFF_INPUTS = 0x10,
    TWO_MIXED_INPUTS = 0x20,
    TWO_DIFF_INPUTS = 0x30,
    OUTPUT_ENABLE = 0x40
  } __attribute__((packed));

  PCF8591(uint8_t addr = 0) :
    TWI::Driver(0x48 | (addr & 0x7)),
    m_cntl(0)
  {}

  bool begin(uint8_t cntl);

  void end()
  {
    twi.release();
  }

  uint8_t sample()
    __attribute__((always_inline))
  {
    uint8_t res;
    twi.read(&res, 1);
    return (res);
  }

  uint8_t sample(uint8_t cntl)
    __attribute__((always_inline))
  {
    begin(cntl);
    uint8_t res = sample();
    end();
    return (res);
  }

  int sample(uint8_t* buf, uint8_t size)
    __attribute__((always_inline))
  {
    return (twi.read(buf, size));
  }

  bool convert(uint8_t value);

private:
  uint8_t m_cntl;
};

#endif