lvgl trying to allocate 1 gigabyte of memory

[mirkokral]

Hello, i get this error:

MPY: soft reboot
Traceback (most recent call last):
  File "<stdin>", line 50, in <module>
  File "display_driver_framework.py", line 178, in __init__
MemoryError: memory allocation failed, allocating 1070255496 bytes

When running this code:

import sys
sys.path.append('.')
import lcd_bus
import st7789

import machine

display_bus = lcd_bus.SPIBus(
    dc=11,
    host=1,
    sclk=40,
    freq=80000000,
    mosi=41,
    miso=38,
    cs=12,
    quad_spi=False,
    tx_only=False,
    cmd_bits=8,
    param_bits=8,
    dc_low_on_data=False,
    sio_mode=False,
    lsb_first=False,
    cs_high_active=False,
    spi_mode=0
)

perion = machine.Pin(10, machine.Pin.OUT)
perion.value(1)

if 0:
    # with DMA, the repaints seem to be too slow? To be investigated
    # we seem to be fine performance-wise without DMA with 320x240 anyway
    import rp2_dma
    rp2_dma=rp2_dma.DMA(0)
else: rp2_dma=None

import lvgl as lv
lv.init()

lcd=st7789.ST7789(
    data_bus=display_bus,
    display_width=240,
    display_height=320,
    # we are going to let the driver handle the allocation of the frame buffers
    frame_buffer1=None,
    frame_buffer2=None,
    backlight_pin=42,
    backlight_on_state=st7789.STATE_HIGH,
    offset_x=0,
    offset_y=0
)
display.init()
scr=lv.obj()
btn=lv.button(scr)
lbl=lv.label(btn)
lbl.set_text("Press me!")
btn.center()
btn.add_event(lambda event: print('Button clicked!'),lv.EVENT.CLICKED,None)
lv.screen_load(scr)

[mirkokral]

For convenience: This is the exact line at the file at the end of the traceback:

178 |            self._disp_drv = lv.display_create(display_width, display_height)

[kdschlosser]

This should now be fixed, can you please test and let me know.

[acowls]

@mirkokral - wondering if you can help as I am trying to build lvgl on a RP2020 PICO W board. Is that your target board ? - I ask since you had a reference to rp2_dma in the code snippet.

I get this error:

Traceback (most recent call last):
  File "<stdin>", line 9, in <module>
NotImplementedError: LCD SPI but is not available for this MCU

I'm thinking support for RP2 is still in the making looking at this line 117 in spi_bus.c:

       #if !defined(mp_hal_pin_output) && !defined(IDF_VER)
            mp_raise_msg(&mp_type_NotImplementedError, MP_ERROR_TEXT("LCD SPI but is not available for this MCU"));
        #else

IDF_VER won't be defined for RP2 builds.

code :

import sys
sys.path.append('.')
import lcd_bus

import machine

display_bus = lcd_bus.SPIBus(
    dc=11,
    host=1,
    sclk=40,
    freq=80000000,
    mosi=41,
    miso=38,
    cs=12,
    quad_spi=False,
    tx_only=False,
    cmd_bits=8,
    param_bits=8,
    dc_low_on_data=False,
    sio_mode=False,
    lsb_first=False,
    cs_high_active=False,
    spi_mode=0
)

lvgl_micropython build from master on 2024-04-09

MicroPython v1.22.1-dirty on 2024-04-09; Raspberry Pi Pico W with RP2040

[kdschlosser]

I have not hammered out getting it to compile for the PI boards yet.

[kdschlosser]

@acowls

I just made a change to the repo. clone it again and built and see if that fixes the problem.

[acowls]

Thanks @kdschlosser that helped progress. Two other changes required to get compilation working on RP2040.

Adding a trailing comma at the end of 'rp2' in make.py line 16:

argParser = ArgumentParser(prefix_chars='-')
argParser.add_argument(
    'target',
    help='build target',
    choices=[
        'esp32', 'windows', 'stm32', 'unix', 'rp2',
        'renesas-ra', 'nrf', 'mimxrt', 'samd'
    ],
    action='store',
    nargs=1
)

adding a parameter to the funcition spi_init - I think this might be required to support rgb 565 byte swap bool added to esp code base also recently. change made in lcd_bus\common_src\spi_bus.c line 44:

    mp_lcd_err_t s_spi_init(mp_obj_t obj, uint16_t width, uint16_t height, uint8_t bpp, uint32_t buffer_size, bool rgb565_byte_swap);

and here on line 199:

   mp_lcd_err_t s_spi_init(mp_obj_t obj, uint16_t width, uint16_t height, uint8_t bpp, uint32_t buffer_size, bool rgb565_byte_swap)

With that the compilation succeeds for the board.

[kdschlosser]

OK those problems are fixed m8

[kdschlosser]

This problem should be solved so I am closing the issue.