Class: Elemac::Connection

Inherits:
Object
  • Object
show all
Defined in:
lib/elemac/connection.rb

Instance Method Summary collapse

Constructor Details

#initialize(vendor: 0x4d8, product: 0x3f, debug: false) ⇒ Connection

Returns a new instance of Connection.



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# File 'lib/elemac/connection.rb', line 5

def initialize(vendor: 0x4d8, product: 0x3f, debug: false)
	@debug = debug
	@dev = HIDAPI::open(vendor, product)
	throw 'Cannot open ELEMAC HID' unless @dev
end

Instance Method Details

#read_data ⇒ Object

Reading data is in form ‘rXYYY’ where X is bit length, YYY is the address in hex Read data ends on byte 0



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# File 'lib/elemac/connection.rb', line 24

def read_data
	raw = @dev.read
	response = ""
	debug_read(raw) if @debug

	raw.each_byte { |x| 
		break if x == 0 
		response += x.chr # Get char (for hex)
	}
	# Reverse bit order
	response = response.scan(/../).reverse.join
	response
end

#request_data(address) ⇒ Object 



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# File 'lib/elemac/connection.rb', line 11

def request_data(address)
	bytes = Array.new(64, 0)
	length = address.length - 1
	bytes[0..length] = address.bytes 
	# Write command to device
	@dev.write(bytes)
	# Read result. 
	response = read_data # this hex form, transform it to number
	response.hex
end