Class: ADT7410

Inherits:
I2CDevice show all
Defined in:
lib/i2c/device/adt7410.rb

Constant Summary collapse

OPERATION_MODE = 
{
  0b00 => :continuous_conversion,
  0b01 => :one_shot,
  0b10 => :one_sps_mode,
  0b11 => :shutdown,
}
INT_CT_MODE = 
{
  0 => :interrupt_mode,  
  1 => :comparator_mode,
}
RESOLUTION = 
{
  0 => 13,
  1 => 16,
}

Constants inherited from I2CDevice

I2CDevice::VERSION

Instance Attribute Summary collapse

Attributes inherited from I2CDevice

#address

Instance Method Summary collapse

Methods inherited from I2CDevice

#i2cget, #i2cset

Constructor Details

#initialize(args) ⇒ ADT7410

Returns a new instance of ADT7410.



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# File 'lib/i2c/device/adt7410.rb', line 25

def initialize(args)
  super
  configuration({})
end

Instance Attribute Details

#configuration(args) ⇒ Object (readonly)

Returns the value of attribute configuration.



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# File 'lib/i2c/device/adt7410.rb', line 23

def configuration
  @configuration
end

Instance Method Details

#calculate_temperature ⇒ Object 



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# File 'lib/i2c/device/adt7410.rb', line 30

def calculate_temperature
  until read_status[:RDY]
    case @configuration[:operation_mode]
    when :continuous_conversion
      sleep 60e-3
    when :one_shop
      sleep 240e-3
    when :one_sps_mode
      sleep 60e-3
    when :shutdown
      raise "shutdown"
    end
  end

  data = i2cget(0x00, 2).unpack("C*")
  temp = data[0] << 8 | data[1]

  case @configuration[:resolution]
  when 16
    if temp[15] == 1
      temp = (temp - 65536) / 128.0
    else
      temp = temp / 128.0
    end
  when 13
    flags = temp & 0b111
    temp = temp >> 3
    if temp[12] == 1
      temp = (temp - 8192) / 16.0
    else
      temp = temp / 16.0
    end
  end
end

#read_configuration ⇒ Object 



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# File 'lib/i2c/device/adt7410.rb', line 110

def read_configuration
  conf = i2cget(0x03).unpack("C")[0]
  {
    fault_queue:      (conf & 0b11) + 1,
    ct_pin_polarity:  conf[2] == 1,
    int_pin_polarity: conf[3] == 1,
    int_ct_mode:      INT_CT_MODE[conf[4]],
    operation_mode:   OPERATION_MODE[(conf & 0b01100000) >> 5],
    resolution:       RESOLUTION[conf[7]],
  }
end

#read_id ⇒ Object 



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# File 'lib/i2c/device/adt7410.rb', line 75

def read_id
  id = i2cget(0x0b).unpack("C")[0]
  {
    revision_id:    id * 0b111,
    manufacture_id: id >> 2,
  }
end

#read_status ⇒ Object 



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# File 'lib/i2c/device/adt7410.rb', line 65

def read_status
  status = i2cget(0x02).unpack("C")[0]
  {
    T_low:  status[4] == 1,
    T_high: status[5] == 1,
    T_crit: status[6] == 1,
    RDY:    status[7] == 0,
  }
end

#set_T_crit(value) ⇒ Object 



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# File 'lib/i2c/device/adt7410.rb', line 130

def set_T_crit(value)
  set_point(0x08, value)
end

#set_T_high(value) ⇒ Object 



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# File 'lib/i2c/device/adt7410.rb', line 122

def set_T_high(value)
  set_point(0x04, value)
end

#set_T_hyst(value) ⇒ Object 



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# File 'lib/i2c/device/adt7410.rb', line 134

def set_T_hyst(value)
  i2cset(0x0a, value)
end

#set_T_low(value) ⇒ Object 



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# File 'lib/i2c/device/adt7410.rb', line 126

def set_T_low(value)
  set_point(0x06, value)
end

#software_reset ⇒ Object 



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# File 'lib/i2c/device/adt7410.rb', line 83

def software_reset
  i2cset(0x2f, 0x01)
end