Getting error after integrating lvgl in stm32u5 dk1 board

[rohit-trustedwear]

I am new to firmware and integrated LVGL in stm32u5 dk1 board . And my elf file size is bigger than internal flash hence using external flash for lvgl images . Also running LVGL in external psram . After running I see first screen then it goes immediately to hardfault . Not able to understand this hardfault reason . Need help here . And I checked that PSRAM and External flash is working fine . I have copied entire code at github GitHub - rohit-trustedwear/stm32dk1-code . the fault is happening at line bg_color.full = buf[0] + (buf[1] << 8); in

#if LV_COLOR_SCREEN_TRANSP
static inline void set_px_argb(uint8_t * buf, lv_color_t color, lv_opa_t opa)
{
lv_color_t bg_color;
lv_color_t res_color;
lv_opa_t bg_opa = buf[LV_IMG_PX_SIZE_ALPHA_BYTE - 1];
#if LV_COLOR_DEPTH == 8
bg_color.full = buf[0];
lv_color_mix_with_alpha(bg_color, bg_opa, color, opa, &res_color, &buf[1]);
if(buf[1] <= LV_OPA_MIN) return;
buf[0] = res_color.full;
#elif LV_COLOR_DEPTH == 16
bg_color.full = buf[0] + (buf[1] << 8);
lv_color_mix_with_alpha(bg_color, bg_opa, color, opa, &res_color, &buf[2]);
if(buf[2] <= LV_OPA_MIN) return;
buf[0] = res_color.full & 0xff;
buf[1] = res_color.full >> 8;
#elif LV_COLOR_DEPTH == 32
bg_color = *((lv_color_t *)buf);
lv_color_mix_with_alpha(bg_color, bg_opa, color, opa, &res_color, &buf[3]);
if(buf[3] <= LV_OPA_MIN) return;
buf[0] = res_color.ch.blue;
buf[1] = res_color.ch.green;
buf[2] = res_color.ch.red;
#endif
}
Below is error screenshot attched .

[Marian_M]

@rohit-trustedwear

stm32u5 dk1

have big RAM and FLASH areas, why your design require PSRAM use???
Seems you memory lvgl config is ugly. Try explain what you do…

[rohit-trustedwear]

we are having many screens for smartwatch approx 50 , hence using psram to allocate all the lvgl objects in memory, it won’t fit in internal ram . And all images lies in external flash. plese see liinker script and lvgl config and main.cpp. copying below entire snapshot of memory and stack in lvgl code .

[Marian_M]

Primary use PSRAM for LVGL reduce effectivity. Secondary PSRAM seems have issue with byte access and align. Avoid LVGL use PSRAM is optimal way, i for example on ESP use PSRAM only for images png stored in flash and expanded into PSRAM cache.
How you test PSRAM ?

[rohit-trustedwear]

I agree to your point that PSRAM will be slow . So I ran the same code now in Internal SRam while images are in external octo spi flash. The UI runs but after some screen change it throws fault .

[Marian_M]

Seems you place fonts to external flash, maybe this too require byte access and … Too STM caches and MPU setup is critical, but hard to solve your big project

[rohit-trustedwear]

in order to test i just integrated a sample project of squareline studio of smartwatch and everything running on internal ram and internal flash but this is also is not running properly and crashing with fault . I have uploaded the code with sample demo of smartwatch of squareline studio at GitHub - rohit-trustedwear/stm32dk1-code , this is simple example which fits in internal ram and should work but getting same issues . I will add MPU then will update further.

Trying same demo as copied below

but crashing during first gui rendering