The ttgo module

The ttgo module is again a pure MicroPython module used to initialize the t-watch hardware. It contains two classes:

• Watch
• Motor
• and Display

• Watch(fastboot=False): creates a Watch object. This method initializes:
  • the I2C port 0 bus
  • the axp202 power management module
  • the display
  • and touch screen hardware
• __init_prep__() initializes:
  • Motor class
  • the PCF8563 real time clock
  • and the BMA423 triaxial acceleration sensor.
• __init_touch__() initializes the FT6236U touch panel controller. This method is called when the Watch object is created
• __display__() initializes the st7789 display controller
• pmu_attach_interrupt(callback): attaches a callback routine to pmu (power management unit) interrupts
• rtc_attach_interrupt(callback): attaches a callback routine to the bma423 interrupt
• enable_audio_power(en=True): enables of disables power to the sound system
• lvgl_begin(): initializes the LVGL graphical user interface library and registers the st7789 display driver and the ft6x36 touch panel driver with LVGL
• init_power(): initializes the pmu system
• power_off(): switch watch power off

import ttgo
watch = ttgo.Watch()

you can access the initialized driver objects with:

• watch.__i2c__
• watch.touch
• watch.tft
• watch.motor
• watch.rtc
• watch.pmu
• watch.bma

• Display(pmu):
  • creates a st7789_lvgl object
  • initializes the back light GPIO pin
  • turns the display back light off
• backlight_fade(val=100): fade the back light level to val
• switch_scene():
• set_backlight_level(percent): set the back light level
• __turn_lcd_backlight__(val): turn back light on or off)
• __set_lcd_backlight_voltage(voltage=3200): set the voltage to a level between 2.4V and 3.2 V

• Motor(): create a Motor object. Create a PWM pin on GPIO 4 to control the vibration motor power
• on(): switch the buzzer and vibration motor on
• off(): switch it off
• set_strength(strength): set the strength of the vibration/buzzer signal
• set_freq(freq): set the PWM frequency

-- Uli Raich - 2021-01-28

Comments