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Add support for LilyGo T-HMI board and initialize display and battery… (#90)
* Add support for LilyGo T-HMI board and initialize display and battery management * Implement detection for LilyGO T-HMI touch screen * Refactor LilyGO T-HMI initialization and update touch device configuration * Remove t-hmi target configuration from build script and streamline OTA support handling
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Lines changed: 206 additions & 4 deletions

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‎internal_filesystem/lib/mpos/board/lilygo_t_hmi.py‎

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print("lilygo_t_hmi.py initialization")
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# Manufacturer: https://lilygo.cc/en-us/products/t-hmi
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# Hardware reference: https://www.tinytronics.nl/en/development-boards/microcontroller-boards/with-wi-fi/lilygo-t-hmi-esp32-s3-2.8-inch-ips-tft-display-met-touchscreen
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# Vendor repository: https://github.com/Xinyuan-LilyGO/T-HMI
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# --- POWER HOLD ---
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from machine import Pin
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Pin(10, Pin.OUT, value=1)
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Pin(14, Pin.OUT, value=1)
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import lcd_bus
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import machine
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from drivers.indev.xpt2046 import XPT2046
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import mpos.ui
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import lvgl as lv
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from machine import Pin
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from micropython import const
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from mpos import BatteryManager
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# display settings
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_WIDTH = const(240)
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_HEIGHT = const(320)
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_BL = const(38)
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_RST = -1
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_CS = const(6)
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_DC = const(7)
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_WR = const(8)
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_FREQ = const(20000000)
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_DATA0 = const(48)
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_DATA1 = const(47)
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_DATA2 = const(39)
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_DATA3 = const(40)
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_DATA4 = const(41)
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_DATA5 = const(42)
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_DATA6 = const(45)
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_DATA7 = const(46)
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_BATTERY_PIN = const(5)
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_TOUCH_CS = const(2)
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_BUFFER_SIZE = const(28800)
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display_bus = lcd_bus.I80Bus(
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dc=_DC,
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wr=_WR,
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cs=_CS,
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data0=_DATA0,
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data1=_DATA1,
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data2=_DATA2,
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data3=_DATA3,
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data4=_DATA4,
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data5=_DATA5,
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data6=_DATA6,
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data7=_DATA7
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)
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fb1 = display_bus.allocate_framebuffer(_BUFFER_SIZE, lcd_bus.MEMORY_SPIRAM)
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fb2 = display_bus.allocate_framebuffer(_BUFFER_SIZE, lcd_bus.MEMORY_SPIRAM)
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import drivers.display.st7789 as st7789
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mpos.ui.main_display = st7789.ST7789(
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data_bus=display_bus,
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frame_buffer1=fb1,
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frame_buffer2=fb2,
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display_width=_WIDTH,
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display_height=_HEIGHT,
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backlight_pin=_BL,
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color_byte_order=st7789.BYTE_ORDER_RGB,
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rgb565_byte_swap=False,
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)
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spi_bus = machine.SPI.Bus(
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host=2,
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mosi=3,
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miso=4,
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sck=1
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)
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touch_dev = machine.SPI.Device(
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spi_bus=spi_bus,
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freq=const(1000000),
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cs=_TOUCH_CS
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)
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indev = XPT2046(
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touch_dev,
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lcd_cs=_CS,
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touch_cs=_TOUCH_CS,
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display_width=_WIDTH,
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display_height=_HEIGHT,
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startup_rotation=lv.DISPLAY_ROTATION._0
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)
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mpos.ui.main_display.init()
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mpos.ui.main_display.set_color_inversion(False)
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mpos.ui.main_display.set_backlight(100)
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mpos.ui.main_display.set_rotation(lv.DISPLAY_ROTATION._0) # must be done after initializing display and creating the touch drivers, to ensure proper handling
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lv.init()
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print("lilygo_t_hmi.py SDCard initialization...")
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# Initialize SD card in SDIO mode
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from mpos import sdcard
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sdcard.init(cmd_pin=11,clk_pin=12,d0_pin=13)
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print("lilygo_t_hmi.py Battery initialization...")
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def adc_to_voltage(raw_adc_value):
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"""
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The percentage calculation uses MIN_VOLTAGE = 3.15 and MAX_VOLTAGE = 4.15
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0% at 3.15V -> raw_adc_value = 210
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100% at 4.15V -> raw_adc_value = 310
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4.15 - 3.15 = 1V
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310 - 210 = 100 raw ADC steps
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So each raw ADC step is 1V / 100 = 0.01V
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Offset calculation:
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"""
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return raw_adc_value * 0.001651 + 0.08709
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BatteryManager.init_adc(_BATTERY_PIN, adc_to_voltage)
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print("lilygo_t_hmi.py finished")

‎internal_filesystem/lib/mpos/main.py‎

Lines changed: 73 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -53,6 +53,75 @@ def single_address_i2c_scan(i2c_bus, address):
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print(f"scan error: {e}")
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return False
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def detect_lilygo_t_hmi():
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from machine import Pin, SoftSPI
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import time
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try:
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sck = Pin(1)
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mosi = Pin(3)
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miso = Pin(4)
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cs = Pin(2, Pin.OUT, value=1)
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irq = Pin(9, Pin.IN, Pin.PULL_UP)
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spi = SoftSPI(
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baudrate=500000,
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polarity=0,
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phase=0,
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sck=sck,
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mosi=mosi,
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miso=miso,
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)
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def read_cmd(cmd):
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tx = bytearray([cmd, 0x00, 0x00])
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rx = bytearray(3)
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cs(0)
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spi.write_readinto(tx, rx)
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cs(1)
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return ((rx[1] << 8) | rx[2]) >> 3
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samples = []
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for _ in range(5):
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vals = (
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read_cmd(0xD0), # X
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read_cmd(0x90), # Y
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read_cmd(0xB0), # Z1
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irq.value(),
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)
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samples.append(vals)
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print("T-HMI touch sample:", vals)
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time.sleep_ms(20)
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# Observed stable idle signature on LilyGO T-HMI:
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# X=0, Y=4095, Z1=0/1, IRQ=1
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signature_hits = sum(
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x == 0 and y == 4095 and z in (0, 1) and irqv == 1
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for x, y, z, irqv in samples
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)
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print(f"T-HMI signature hits: {signature_hits}/5")
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if signature_hits >= 4:
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print("LilyGO T-HMI touch signature matched")
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return True
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except Exception as e:
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print(f"LilyGO T-HMI detection failed: {e}")
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finally:
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try:
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Pin(1, Pin.IN, pull=None)
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Pin(2, Pin.IN, pull=None)
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Pin(3, Pin.IN, pull=None)
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Pin(4, Pin.IN, pull=None)
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Pin(9, Pin.IN, pull=None)
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except Exception:
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pass
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return False
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def fail_save_i2c(sda, scl):
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from machine import I2C, Pin
@@ -103,8 +172,11 @@ def detect_board():
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if unique_id_prefixes == b'\x30\xae\xa4':
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return "odroid_go"
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# Do I2C-based board detection
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print("lilygo_t_hmi ?")
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if detect_lilygo_t_hmi():
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return "lilygo_t_hmi"
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# Do I2C-based board detection
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print("lilygo_t_watch_s3_plus ?")
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if i2c0 := fail_save_i2c(sda=10, scl=11):
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if single_address_i2c_scan(i2c0, 0x19): # IMU on 0x19, vibrator on 0x5A and scan also shows: [52, 81]

‎scripts/build_mpos.sh‎

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rm "$stream_wav_file".backup
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else
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echo "invalid target $target"
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fi
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fi

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