touchscreen (touch screen)

The touchscreen module contains basic reading touch screen operations

Currently supported touch screens:

• ns2009 (default)

If you need to modify the driver model, you need to recompile the MaixPy source code to modify the pre-compiled supported model

Global functions

init(i2c=None, cal=None)

Initialize the touch screen

API may be changed later (mainly for changes to parameters of multiple drivers)

Parameters

• i2c: Currently supports the touch screen of I2C communication. Pass in the I2C instance object, this parameter may be renamed or cancelled later
• cal: Calibration data, a tuple of 7 integer values, which can be obtained by the touchscreen.calibrate() function

calibrate()

Calibrate the screen so that the screen display and touch screen pixels can correspond

return value

Return a tuple of 7 integer values, which can be saved to the file system or flash and passed in during initialization, so that there is no need to calibrate every time

read()

Read the current screen state and the coordinate value of the pressed point

return value

A tuple (status, x, y) composed of 3 integer values, note that this value will always keep the previous state

• status: status, the values ​​are touchscreen.STATUS_PRESS, touchscreen.STATUS_MOVE, touchscreen.STATUS_RELEASE
• x: x axis coordinate
• y: y axis coordinate

Constant

touchscreen.STATUS_PRESS

The screen is pressed, the first value of the tuple returned by the read() function

touchscreen.STATUS_MOVE

The screen is pressed and moved, that is, press to move, the first value of the tuple returned by the read() function

touchscreen.STATUS_RELEASE

The screen is no longer held down, that is, there is no click, the first value of the tuple returned by the read() function

Routine

Routine 1: Drawing board

Black background and white pen drawing board, use the boot button to clear the content

Cancel the comment of ts.calibrate() to start the touch screen calibration program

board_info is related to the board, and different board configurations are different. Manual configuration is required before use.

import touchscreen as ts
from machine import I2C
import lcd, image
from board import board_info
from fpioa_manager import *

board_info=board_info()

fm.register(board_info.BOOT_KEY, fm.fpioa.GPIO1)
btn_clear = GPIO(GPIO.GPIO1, GPIO.IN)

lcd.init()
i2c = I2C(I2C.I2C0, freq=400000, scl=30, sda=31)
ts.init(i2c)
#ts.calibrate()
lcd.clear()
img = image.Image()
status_last = ts.STATUS_IDLE
x_last = 0
y_last = 0
draw = False
while True:
    (status,x,y) = ts.read()
    print(status, x, y)
    if draw:
        img.draw_line((x_last, y_last, x, y))
    if status_last!=status:
        if (status==ts.STATUS_PRESS or status == ts.STATUS_MOVE):
            draw = True
        else:
            draw = False
        status_last = status
    lcd.display(img)
    x_last = x
    y_last = y
    if btn_clear.value() == 0:
        img.clear()
ts.__del__()