Hardware driver to interface resistive touch panels with the STM32 microcontroller. More...

Public Member Functions
def	__init__ (self, x_p, x_m, y_p, y_m)
	Constructs a touch panel object. More...

def	get_x (self)
	Reads x position. More...

def	get_y (self)
	Reads y position. More...

def	get_z (self)
	Reads z "position" and creates a boolean flag for when contact is detected.

def	get_coords (self)
	Gets x, y, and z positions. More...

def	calibrate (self)
	Calibrates touch panel.

Public Attributes
	x_p
	Variable for pin reading x-component of contact point. More...

	x_m
	Variable for pin reading x-component of contact point. More...

	y_p
	Variable for pin reading y-component of contact point. More...

	y_m
	Variable for pin reading y-component of contact point. More...

	x_width
	Variable for width of touch panel. More...

	y_length
	Variable for length of touch panel. More...

	z_ADC_flag
	A boolean flag used to detect contact with touch panel. More...

	calibrate_flag
	A flag used to signal whether the panel has been calibrated or not. More...

	beta
	Array to define beta values. More...

	z_ADC
	Uncalibrated z-position values read by touch panel. More...

	x_ADC
	Uncalibrated x-position values read by touch panel. More...

	y_ADC
	Uncalibrated y-position values read by touch panel. More...

	x_ADC_cal
	Calibrated x-position values read by touch panel. More...

	y_ADC_cal
	Calibrated y-position values read by touch panel. More...

	calibrated_pos
	Calibrated x and y positions read by panel. More...

	uncalibrated_pos
	Uncalibrated x and y positions read by panel. More...

	panel_coords
	Array of panel coordinates. More...

	panel_coords_instr
	Instructions for user during panel calibration. More...

	panel_meas
	Empty array for panel measurements. More...

	i
	A variable used for indexing. More...

	touch_coeffs
	Array of calculated panel coefficients. More...

Detailed Description

Hardware driver to interface resistive touch panels with the STM32 microcontroller.

Scans X, Y, and Z components of contact point on touch panel by configuring 4 pin objects

Constructor & Destructor Documentation

◆ init()

def touch_pan.Touch_Pan.__init__	(	self,
		x_p,
		x_m,
		y_p,
		y_m
	)

Constructs a touch panel object.

The touch panel object is created from four touch panel pins configured to read the touch panel.

Parameters

x_p	Used to scan x component from touch panel, configured as a push-pull output
x_m	Used to scan x component from touch panel, configured as a push-pull output
y_p	Used to scan y component from touch panel, configured as a push-pull output
y_m	Used to scan y component from touch panel, configured as a push-pull output

Member Function Documentation

◆ get_coords()

def touch_pan.Touch_Pan.get_coords ( self )

Gets x, y, and z positions.

Returns uncalibrated and calibrated values.

◆ get_x()

def touch_pan.Touch_Pan.get_x ( self )

Reads x position.

Returns uncalibrated values.

◆ get_y()

def touch_pan.Touch_Pan.get_y ( self )

Reads y position.

Returns uncalibrated values.

Member Data Documentation

◆ beta

touch_pan.Touch_Pan.beta

Array to define beta values.

Used to calibrate the touch panel and account for center offset

◆ calibrate_flag

touch_pan.Touch_Pan.calibrate_flag

A flag used to signal whether the panel has been calibrated or not.

Determines which coordinate values (calibrated or not-calibrated) to return

◆ calibrated_pos

touch_pan.Touch_Pan.calibrated_pos

Calibrated x and y positions read by panel.

Creates list of positions to be used for state vectors

◆ i

touch_pan.Touch_Pan.i

A variable used for indexing.

This value helps index state vector points for calibration

◆ panel_coords

touch_pan.Touch_Pan.panel_coords

Array of panel coordinates.

Coordinates to be used in panel calibration calculations

◆ panel_coords_instr

touch_pan.Touch_Pan.panel_coords_instr

Instructions for user during panel calibration.

User touches the listed coordinates for panel calibration

◆ panel_meas

touch_pan.Touch_Pan.panel_meas

Empty array for panel measurements.

Measured positional coordinates to be used in panel calibration calculations

◆ touch_coeffs

touch_pan.Touch_Pan.touch_coeffs

Array of calculated panel coefficients.

Beta values that will be applied to ADC position readings to calibrate touch panel coordinates

◆ uncalibrated_pos

touch_pan.Touch_Pan.uncalibrated_pos

Uncalibrated x and y positions read by panel.

Creates list of uncalibrated positions. Should not be used for ball balancing.

◆ x_ADC

touch_pan.Touch_Pan.x_ADC

Uncalibrated x-position values read by touch panel.

Measures x-position

◆ x_ADC_cal

touch_pan.Touch_Pan.x_ADC_cal

Calibrated x-position values read by touch panel.

Measures x-position accurately based on manual or automatic calibration constants

◆ x_m

touch_pan.Touch_Pan.x_m

Variable for pin reading x-component of contact point.

Used to locate touch in x-direction

◆ x_p

touch_pan.Touch_Pan.x_p

Variable for pin reading x-component of contact point.

Used to locate touch in x-direction

◆ x_width

touch_pan.Touch_Pan.x_width

Variable for width of touch panel.

Defines width of panel in the x-direction

◆ y_ADC

touch_pan.Touch_Pan.y_ADC

Uncalibrated y-position values read by touch panel.

Measures y-position

◆ y_ADC_cal

touch_pan.Touch_Pan.y_ADC_cal

Calibrated y-position values read by touch panel.

Measures y-position accurately based on manual or automatic calibration constants

◆ y_length

touch_pan.Touch_Pan.y_length

Variable for length of touch panel.

Defines length of panel in the y-direction

◆ y_m

touch_pan.Touch_Pan.y_m

Variable for pin reading y-component of contact point.

Used to locate touch in y-direction

◆ y_p

touch_pan.Touch_Pan.y_p