Picarx.set_grayscale_reference is not working

[mit-koyano]

The self.get_grayscale_reference, which is assigned by Picarx.set_grayscale_reference, is not being referred to within the class. Shouldn't it be sync with the reference of self.grayscale (i.e., the Grayscale_Module class)?

picar-x/picarx/picarx.py

Lines 191 to 192 in 425522e

	def set_grayscale_reference(self, value):
	self.get_grayscale_reference = value

This seems puzzling even when looking at example/minecart_plus.py. At the beginning of minecart_plus.py, the following comment and code exist:

picar-x/example/minecart_plus.py

Lines 1 to 17 in 425522e

	'''
	Line Following program for Picar-X:
	Pay attention to modify the reference value of the grayscale module
	according to the practical usage scenarios.Use the following:
	px.grayscale.reference = 1400
	or
	px.set_grayscale_reference(1400)
	'''
	from picarx import Picarx
	from time import sleep
	px = Picarx()
	# px = Picarx(grayscale_pins=['A0', 'A1', 'A2'])
	px.set_grayscale_reference(1400)
	# px.grayscale.reference = 1400

However, as px.set_grayscale_reference seems meaningless, the subsequent px.get_line_status always returns 'forward' and does not function properly.

picar-x/example/minecart_plus.py

Lines 45 to 47 in 425522e

	gm_val_list = px.get_grayscale_data()
	gm_state = px.get_line_status(gm_val_list)
	print("gm_val_list: %s, %s"%(gm_val_list, gm_state))