Hard fault migrating LVGL from 8.0 to 9.1 on a STM32H723ZGTx
Description
I’m trying to migrate my LVGL 8.0 project currently running on a STM32H723ZGTx to the version 9.1. My project comprehend a display attached to the MCU, and the MCU itself has attached an external SRAM.
I’ve followed the new STM32 guide and also checked the Changelog.
I use the two display buffers for my screen, and this is my flush cb function.
void stm32_flush_cb(lv_disp_drv_t *disp_drv, const lv_area_t *area, lv_color_t *color_p) {
lv_disp_t *disp = _lv_refr_get_disp_refreshing();
lv_color_t *dma_xfer_src, *dma_xfer_dst;
HAL_LTDC_Reload(&hltdc, LTDC_RELOAD_VERTICAL_BLANKING);
dma_xfer_src = color_p;
if (color_p == framebuffer_1) {
dma_xfer_dst = framebuffer_2;
} else {
dma_xfer_dst = framebuffer_1;
}
for (size_t i = 0; i < disp->inv_p; i++) {
dma2d_copy_area(disp->inv_areas[i], (uint32_t)dma_xfer_src, (uint32_t)dma_xfer_dst);
}
lv_disp_flush_ready(disp_drv);
}
Because in the 9.1 version there is no more invalidate areas field inside a `lv_disp_t (correct me if I’m wrong), I’ve changed the flush function by removing
for (size_t i = 0; i < disp->inv_p; i++) {
dma2d_copy_area(disp->inv_areas[i], (uint32_t)dma_xfer_src, (uint32_t)dma_xfer_dst);
}
This part isn’t necessary but it was an optimization, also mentioned in the faq
So, in my main.c after all the initialization functions added by STM32CubeMX, I’ve called lv_init() and my screen driver init function, that, before the changes for the 9.1 version, was
void screen_driver_init() {
static lv_disp_draw_buf_t draw_buf; //internal graphic buffer(s) called draw buffer(s)
lv_disp_draw_buf_init(&draw_buf, framebuffer_1, framebuffer_2, FRAMEBUFFER_SIZE);
lv_disp_drv_init(&lv_display_driver);
lv_display_driver.direct_mode = true;
lv_display_driver.hor_res = SCREEN_WIDTH;
lv_display_driver.ver_res = SCREEN_HEIGHT;
lv_display_driver.flush_cb = stm32_flush_cb;
lv_display_driver.draw_buf = &draw_buf;
lv_display_driver.dpi = 1;
lv_disp_drv_register(&lv_display_driver);
}
and now I changed to
lv_display_t * disp = lv_display_create(LCD_SCREEN_WIDTH, LCD_SCREEN_HEIGHT); /*Basic initialization with horizontal and vertical resolution in pixels*/
lv_display_set_flush_cb(disp, stm32_flush_cb); /*Set a flush callback to draw to the display*/
lv_display_set_buffers(disp, framebuffer_1, framebuffer_2, FRAMEBUFFER_SIZE, LV_DISPLAY_RENDER_MODE_PARTIAL); /*Set an initialized buffer*/
After that I’ve while(1) with refresh graphics function into it, with
lv_timer_handler();
Unfortunately, even if I’ve checked all the info about it, with this porting to lvgl version 9.1 the MCU goes in hard fault doing lv_timer_handler(). This is the stack trace
HardFault_Handler@0x08025caa
<signal handler called>@0xffffffe9 (Unknown Source:0)
lv_draw_rect@0x0800e4e4 (../lvgl-stm32/lvgl/src/draw/lv_draw_rect.c:182)
lv_obj_draw@0x0800643e (../lvgl-stm32/lvgl/src/core/lv_obj.c:479)
lv_obj_event_base@0x08007572 (../lvgl-stm32/lvgl/src/core/lv_obj_event.c:86)
event_send_core@0x080075b8 (../lvgl-stm32/lvgl/src/core/lv_obj_event.c:359)
lv_obj_send_event@0x0800763c (../lvgl-stm32/lvgl/src/core/lv_obj_event.c:64)
lv_obj_redraw@0x0800b272 (../lvgl-stm32/lvgl/src/core/lv_refr.c:110)
refr_obj_and_children@0x0800b7e2 (../lvgl-stm32/lvgl/src/core/lv_refr.c:790)
refr_area_part@0x0800b916 (../lvgl-stm32/lvgl/src/core/lv_refr.c:723)
refr_area@0x0800c03c (../lvgl-stm32/lvgl/src/core/lv_refr.c:650)
refr_invalid_areas@0x0800c03c (../lvgl-stm32/lvgl/src/core/lv_refr.c:566)
_lv_display_refr_timer@0x0800c03c (../lvgl-stm32/lvgl/src/core/lv_refr.c:374)
lv_timer_exec@0x0801969c (../lvgl-stm32/lvgl/src/misc/lv_timer.c:300)
lv_timer_handler@0x0801969c (../lvgl-stm32/lvgl/src/misc/lv_timer.c:105)
lv_timer_handler@0x0801969c (../lvgl-stm32/lvgl/src/misc/lv_timer.c:63)
refresh_graphics@0x080286c2 (../Core/UI/steering/graphics_manager.c:28)
main@0x0802592e (../Core/Src/main.c:198)
What could cause this hard fault? Before migrating to 9.1 version, all software and the display itself worked.
What MCU/Processor/Board and compiler are you using?
I’m using a STM32H723ZGTx and gcc to compile, using the STM32 for VSCode extension
What LVGL version are you using?
v9.1.0-2-gcac17b580
What do you want to achieve?
Make the display working
Code to reproduce
Above
Screenshot and/or video
This is what the display is showinfg during the hard fault
