add tsc2007 touch driver

[FoamyGuy]

This adds a new touch driver for TSC2007 device. The initial version of the new driver was drafted by Codex and then reviewed and refined by me.

I tested it successfully with a build of MicropythonOS which is built on top of lvgl_micropython and this more basic example code. Hardware was Metro S3 + 2.8" TFT Shield

from micropython import const
import machine
import lcd_bus
import lvgl as lv
import ili9341
import task_handler
import i2c
import tsc2007


# Adjust these pins for your ESP32_GENERIC_S3 wiring
_WIDTH = const(240)
_HEIGHT = const(320)
_BL = const(5)
_RST = const(4)
_DC = const(9)

_MOSI = const(42)
_MISO = const(21)
_SCK = const(39)
_HOST = const(1)  # SPI2

_LCD_CS = const(10)
_LCD_FREQ = const(40000000)

# TSC2007 I2C touch pins (update these for your board)
_TP_SCL = const(48)
_TP_SDA = const(47)
_TP_FREQ = const(100000)


lv.init()

spi_bus = machine.SPI.Bus(
    host=_HOST,
    mosi=_MOSI,
    miso=_MISO,
    sck=_SCK,
)

display_bus = lcd_bus.SPIBus(
    spi_bus=spi_bus,
    freq=_LCD_FREQ,
    dc=_DC,
    cs=_LCD_CS,
)

display = ili9341.ILI9341(
    data_bus=display_bus,
    display_width=_WIDTH,
    display_height=_HEIGHT,
    backlight_pin=_BL,
    reset_pin=_RST,
    color_space=lv.COLOR_FORMAT.RGB565,
    color_byte_order=ili9341.BYTE_ORDER_BGR,
    rgb565_byte_swap=True,
)

display.set_power(True)
display.init(1)
display.set_backlight(100)

# TSC2007 touch setup
i2c_bus = i2c.I2C.Bus(host=0, scl=_TP_SCL, sda=_TP_SDA, freq=_TP_FREQ, use_locks=False)
touch_dev = i2c.I2C.Device(bus=i2c_bus, dev_id=tsc2007.I2C_ADDR, reg_bits=tsc2007.BITS)
indev = tsc2007.TSC2007(touch_dev)

# Resistive touch generally needs calibration
if not indev.is_calibrated:
    indev.calibrate()

th = task_handler.TaskHandler()

scrn = lv.screen_active()
scrn.set_style_bg_color(lv.color_hex(0x202020), 0)

status_label = lv.label(scrn)
status_label.set_text("Touch test: tap the button")
status_label.align(lv.ALIGN.TOP_MID, 0, 12)

btn = lv.button(scrn)
btn.set_size(180, 70)
btn.center()

btn_label = lv.label(btn)
btn_label.set_text("Touch me")
btn_label.center()

count_label = lv.label(scrn)
count_label.set_text("Clicks: 0")
count_label.align(lv.ALIGN.BOTTOM_MID, 0, -20)

click_count = 0


def on_btn_event(evt):
    global click_count

    if evt.get_code() == lv.EVENT.CLICKED:
        click_count += 1
        count_label.set_text("Clicks: {}".format(click_count))
        btn_label.set_text("Touched!")
        btn_label.center()


btn.add_event_cb(on_btn_event, lv.EVENT.ALL, None)