If anyone wants to give this a go they can try it. Just like using any other ili9xxx display. I am getting an st7796 display on Wednesday to test with so I will be able to tinker about more but until then give this a go and see what happens
import ili9XXX
import lvgl as lv
RGB666 = 1
RGB565 = 2
class st7796(ili9XXX.ili9XXX):
# The st7795 display controller has an internal framebuffer arranged in 320 x 480
# configuration. Physical displays with pixel sizes less than 320 x 480 must supply a start_x and
# start_y argument to indicate where the physical display begins relative to the start of the
# display controllers internal framebuffer.
def __init__(self,
miso=-1, mosi=19, clk=18, cs=13, dc=12, rst=4, power=-1, backlight=15, backlight_on=1, power_on=0,
spihost=ili9XXX.HSPI_HOST, spimode=0, mhz=80, hybrid=True, width=320, height=480, start_x=0, start_y=0,
colormode=ili9XXX.COLOR_MODE_RGB, rot=ili9XXX.PORTRAIT, invert=False, double_buffer=True, half_duplex=True,
asynchronous=False, initialize=True, color_format=lv.COLOR_FORMAT.NATIVE_REVERSE, pixel_format=RGB666):
if pixel_format == RGB666:
pixel_format = 0x06 # 262K-Colors
factor = 4
if lv.color_t.__SIZE__ != 4:
raise RuntimeError(
'ST7796 micropython driver '
'requires defining LV_COLOR_DEPTH=32'
)
elif pixel_format == RGB565:
factor = 2
pixel_format = 0x05 # 65K-Colors
if lv.color_t.__SIZE__ != 2:
raise RuntimeError(
'ST7796 micropython driver '
'requires defining LV_COLOR_DEPTH=16'
)
else:
raise RuntimeError(
'Invalid pixel format, only RGB565 and RGB666 can be used'
)
self.display_name = 'ST7796'
self.init_cmds = [
{'cmd': 0x01, 'data': bytes([]), 'delay':120}, # SWRESET
{'cmd': 0x11, 'data': bytes([]), 'delay':120}, # SLPOUT
{'cmd': 0xF0, 'data': bytes([0xC3])}, # CSCON
{'cmd': 0xF0, 'data': bytes([0x96])}, # CSCON
{'cmd': 0x36, 'data': bytes([self.madctl(colormode, rot, (ili9XXX.MADCTL_MX | ili9XXX.MADCTL_MY, ili9XXX.MADCTL_MV | ili9XXX.MADCTL_MY, 0, ili9XXX.MADCTL_MX | ili9XXX.MADCTL_MV))])}, # MADCTL
{'cmd': 0x3A, 'data': bytes([pixel_format])}, # Interface_Pixel_Format
{'cmd': 0xB4, 'data': bytes([0x01])}, # INVTR
{'cmd': 0xB6, 'data': bytes([0x80, 0x02, 0x3B])}, # DFC
{'cmd': 0xE8, 'data': bytes([0x40, 0x8A, 0x00, 0x00, 0x29, 0x19, 0xA5, 0x33])}, # DOCA
{'cmd': 0xC1, 'data': bytes([0x06])}, # PWR2
{'cmd': 0xC2, 'data': bytes([0xA7])}, # PWR3
{'cmd': 0xC5, 'data': bytes([0x18]), 'delay':120}, # VCMPCTL
{'cmd': 0xE0, 'data': bytes([0xF0, 0x09, 0x0b, 0x06, 0x04, 0x15, 0x2F, 0x54, 0x42, 0x3C, 0x17, 0x14, 0x18, 0x1B])}, # PGC
{'cmd': 0xE1, 'data': bytes([0xE0, 0x09, 0x0B, 0x06, 0x04, 0x03, 0x2B, 0x43, 0x42, 0x3B, 0x16, 0x14, 0x17, 0x1B]), 'delay':120}, # NGC
{'cmd': 0xF0, 'data': bytes([0x3C])}, # CSCON
{'cmd': 0xF0, 'data': bytes([0x69]), 'delay':120}, # CSCON
{'cmd': 0x29, 'data': bytes([])} # DISPON
]
super().__init__(miso=miso, mosi=mosi, clk=clk, cs=cs, dc=dc, rst=rst, power=power, backlight=backlight,
backlight_on=backlight_on, power_on=power_on, spihost=spihost, spimode=spimode, mhz=mhz, factor=factor, hybrid=hybrid,
width=width, height=height, start_x=start_x, start_y=start_y, invert=invert, double_buffer=double_buffer,
half_duplex=half_duplex, display_type=DISPLAY_TYPE_ST7796, asynchronous=asynchronous,
initialize=initialize, color_format=color_format)