Class: PiDriver::I2CMaster

Inherits:
Object
  • Object
show all
Defined in:
lib/pi_driver/i2c_master.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ I2CMaster

Returns a new instance of I2CMaster.



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# File 'lib/pi_driver/i2c_master.rb', line 3

def initialize(options = {})
  @frequency = 100_000
  @delta_time = @frequency ** -1.0
  @clock_pin = options[:clock_pin]
  @data_pin = options[:data_pin]
  @num_bits = 8
  stop
end

Class Method Details

.prepare_address_for_read(address_byte) ⇒ Object 



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# File 'lib/pi_driver/i2c_master.rb', line 46

def self.prepare_address_for_read(address_byte)
  (address_byte << 1) | 1
end

.prepare_address_for_write(address_byte) ⇒ Object 



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# File 'lib/pi_driver/i2c_master.rb', line 42

def self.prepare_address_for_write(address_byte)
  address_byte << 1
end

Instance Method Details

#ack ⇒ Object 



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# File 'lib/pi_driver/i2c_master.rb', line 34

def ack
  release_data_pin
  release_clock_pin
  success = @data_pin.clear?
  drive_clock_pin
  success
end

#read ⇒ Object 



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# File 'lib/pi_driver/i2c_master.rb', line 29

def read
  release_data_pin
  read_data
end

#start ⇒ Object Also known as: restart 



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# File 'lib/pi_driver/i2c_master.rb', line 17

def start
  drive_data_pin
  drive_clock_pin
end

#stop ⇒ Object 



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# File 'lib/pi_driver/i2c_master.rb', line 12

def stop
  release_clock_pin
  release_data_pin
end

#write(byte) ⇒ Object 



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# File 'lib/pi_driver/i2c_master.rb', line 24

def write(byte)
  send_data byte
  byte
end