Initialization for 128x128 0.85" LCD with GC9107

lcd128x128_gc9107.py

# Example init and basic routines for 0.85" 128x128 pixel LCD
# Sold under Wisevision N085-1212TBWIG41-H12
#
# Unnecessary init commands have been stripped out versus other 
# routines I found online


def write_cmd(cmd):
    set_dc_pin_low()
    spi_transmit(cmd)


def write_cmd_data(cmd, data):
    write_cmd(cmd)
    set_dc_pin_high()
    spi_transmit(data)


def init_lcd():
    # reset required on power up
    set_reset_low()
    sleep(120)
    set_reset_high()

    set_cs_low()

    # Pixel format set
    # 0x1 = 12 bits / pixel
    # 0x5 = 16 bits / pixel
    # 0x6 = 18 bits / pixel
    write_cmd_data(0x3A, 0x05)

    # Display inversion on
    write_cmd(0x21)

    # Sleep out
    write_cmd(0x11)

    set_cs_high()

    # Wait 120 ms
    sleep(120)
    set_cs_low()

    # Display on
    write_cmd(0x29)
    set_cs_high()

    # Wait 20 ms
    sleep(20)


COL_OFFSET = 2
ROW_OFFSET = 1


def write_data(data_bytes):
    set_dc_pin_high()
    for b in data_bytes:
        spi_transmit(b)


def hi_byte(d):
    return (d & 0xFF00) >> 8


def lo_byte(d):
    return (d & 0xFF)


def set_window(x, y, width, height):
    col = x + COL_OFFSET
    col_data = [
        hi_byte(col), low_byte(col),
        hi_byte(col + width - 1), low_byte(col + width - 1)
    ]
    row = y + ROW_OFFSET
    row_data = [
        hi_byte(row), low_byte(row),
        hi_byte(row + height - 1), low_byte(row + height - 1)
    ]

    set_cs_pin_low()
    write_cmd(0x2A)
    write_data(col_data)
    write_cmd(0x2B)
    write_data(row_data)
    set_cs_pin_high()


def write_window(x, y, width, height, pixel_data):
    set_window(x, y, width, height)
    set_cs_pin_low()
    write_cmd(0x2C)
    write_data(pixel_data)
    set_cs_pin_high()

    
def clear_to_color(color_r5g6b5):
    hi = hi_byte(color_r5g6b5)
    lo = lo_byte(color_r5g6b5)
    write_window(0, 0, 128, 128, [hi, lo] * 128 * 128)