nRF5340DK ILI9341 Display Secure Fault for LVGL Draw Function

Question

Hi DevZone Community

I'm trying to get a simple Hello World sample to run on an nRF5340DK board with a 2.8" ILI9341 based TFT display that has Arduino headers attached (https://www.buydisplay.com/arduino-ips-2-8-inch-tft-touch-shield-example-ili9341-for-mega-due-uno). I originally used this display with an Arduino Mega to get an LVGL example up and running and test the connections, now I want to get this up and running within the Nordic environment.

I'm using VS Code (nRF Connect Extenstion, nRF Connect SDK V3.0.2).

I managed to get the basic Hello World program to compile and I can see a grey block drawn on the display, but not the Hello World label and then I run into a Secure Fault, with addr2line indicating that the fault originates from /opt/nordic/ncs/v3.0.2/modules/lib/gui/lvgl/src/draw/lv_draw.c:94

I'm not sure what I'm missing or why the lv_draw function causes the secure fault error or if this could be caused by the wrong config in my project.

I will show the full error below and include my overlay file, project config and the main.c source code.

Any help would be greatly appreciated.

Kind regards,
Charl

*** Booting MCUboot v2.1.0-dev-ae1ee57f3906 ***
*** Using nRF Connect SDK v3.0.2-89ba1294ac9b ***
*** Using Zephyr OS v4.0.99-f791c49f492c ***
I: Starting bootloader
I: Primary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Secondary image: magic=unset, swap_type=0x1, copy_done=0x3, image_ok=0x3
I: Boot source: none
I: Image index: 0, Swap type: none
I: Bootloader chainload address offset: 0xc000
I: Image version: v3.0.2
�[00:00:00.011,749] <dbg> display_ili9xxx: ili9xxx_display_blanking_on: Turning display blanking on
[00:00:00.011,993] <dbg> display_ili9341: ili9341_regs_init: PWSEQCTRL
55 01 23 01 |U.#.
[00:00:00.012,145] <dbg> display_ili9341: ili9341_regs_init: TIMCTRLA
84 11 7a |..z
[00:00:00.012,268] <dbg> display_ili9341: ili9341_regs_init: TIMCTRLB
00 00 |..
[00:00:00.012,420] <dbg> display_ili9341: ili9341_regs_init: PUMPRATIOCTRL
10 |.
[00:00:00.012,542] <dbg> display_ili9341: ili9341_regs_init: PWCTRLA
39 2c 00 34 02 |9,.4.
[00:00:00.012,664] <dbg> display_ili9341: ili9341_regs_init: PWCTRLB
00 8b 30 |..0
[00:00:00.012,817] <dbg> display_ili9341: ili9341_regs_init: GAMSET
01 |.
[00:00:00.012,908] <dbg> display_ili9341: ili9341_regs_init: FRMCTR1
00 1b |..
[00:00:00.013,061] <dbg> display_ili9341: ili9341_regs_init: DISCTRL
0a 82 27 04 |..'.
[00:00:00.013,214] <dbg> display_ili9341: ili9341_regs_init: PWCTRL1
21 |!
[00:00:00.013,336] <dbg> display_ili9341: ili9341_regs_init: PWCTRL2
10 |.
[00:00:00.013,427] <dbg> display_ili9341: ili9341_regs_init: VMCTRL1
31 3c |1<
[00:00:00.013,580] <dbg> display_ili9341: ili9341_regs_init: VMCTRL2
c0 |.
[00:00:00.013,671] <dbg> display_ili9341: ili9341_regs_init: PGAMCTRL
0f 22 1f 0a 0e 06 4d 76 3b 03 0e 04 13 0e 0c |."....Mv ;......
[00:00:00.013,854] <dbg> di[00:00:00.014,038] <dbg> display_ili9341: ili9341_regs_init: ENABLE3G
02 |.
[00:00:00.014,129] <dbg> display_ili9341: ili9341_regs_init: IFMODE
40 |@
[00:00:00.014,221] <dbg> display_ili9341: ili9341_regs_init: IFCTL
01 00 00 |...
[00:00:00.014,373] <dbg> display_ili9341: ili9341_regs_init: ETMOD
06 |.
*** Booting My Application v3.0.2-ebefab8b5d15 ***
*** Using nRF Connect SDK v3.0.2-89ba1294ac9b ***
*** Using Zephyr OS v4.0.99-f791c49f492c ***
[00:00:00.135,620] <dbg> app: main: Display Hello World! nrf5340dk (3.0.2+0)
[00:00:00.135,650] <dbg> app: display_manager_init: Initializing display manager
[00:00:00.135,681] <dbg> app: display_manager_init: Display name: ili9341@0
[00:00:00.135,681] <dbg> display_ili9xxx: ili9xxx_display_blanking_off: Turning display blanking off
[00:00:00.138,916] <dbg> display_ili9xxx: ili9xxx_write: Writing 320x48 (w,h) @ 0x0 (x,y)
[00:00:00.201,232] <dbg> display_ili9xxx: ili9xxx_write: Writing 320x48 (w,h) @ 0x48 (x,y)
[00:00:00.266,021] <err> os: ***** SECURE FAULT *****
[00:00:00.266,021] <err> os: Address: 0x8
[00:00:00.266,052] <err> os: Attribution unit violation
[00:00:00.266,052] <err> os: r0/a1: 0x00000074 r1/a2: 0x00000074 r2/a3: 0x000000cb
[00:00:00.266,082] <err> os: r3/a4: 0x0000007c r12/ip: 0x20008e94 r14/lr: 0x00025229
[00:00:00.266,082] <err> os: xpsr: 0x01000000
[00:00:00.266,082] <err> os: Faulting instruction address (r15/pc): 0x0002c36a
[00:00:00.266,113] <err> os: >>> ZEPHYR FATAL ERROR 41: Unknown error on CPU 0
[00:00:00.266,143] <err> os: Current thread: 0x20008f80 (main)

#include <zephyr/dt-bindings/mipi_dbi/mipi_dbi.h>
#include <zephyr/dt-bindings/display/ili9xxx.h>

/ {
	chosen {
		zephyr,display = &ili9341;
	};

    mipi_dbi {
        compatible = "zephyr,mipi-dbi-spi";
        spi-dev = <&arduino_spi>;
		dc-gpios = <&gpio1 9 GPIO_ACTIVE_HIGH>;
		reset-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
        #address-cells = <1>;
        #size-cells = <0>;
        write-only;

        ili9341: ili9341@0 {
            status = "okay";
            compatible = "ilitek,ili9341";
            mipi-max-frequency = <5625000>;
            reg = <0>;
            width = <240>;
            height = <320>;
            rotation = <270>;
            pixel-format = <ILI9XXX_PIXEL_FORMAT_RGB565>;
            mipi-mode = "MIPI_DBI_MODE_SPI_4WIRE";
        };
    };
};

&arduino_spi {
	status = "okay";
	cs-gpios = <&gpio1 11 GPIO_ACTIVE_LOW>;
};

# Increased heap for LVGL and display driver stability
CONFIG_HEAP_MEM_POOL_SIZE=131072
CONFIG_MAIN_STACK_SIZE=16384

# Enable logging
CONFIG_LOG=y

# Display stack
CONFIG_DISPLAY=y
CONFIG_DISPLAY_LOG_LEVEL_DBG=y
CONFIG_SPI=y
CONFIG_GPIO=y
CONFIG_MIPI_DBI=y
CONFIG_MIPI_DBI_SPI=y
CONFIG_ILI9341=y

# LVGL integration
CONFIG_LVGL=y
CONFIG_LV_CONF_SKIP=y
CONFIG_LV_CONF_MINIMAL=y
CONFIG_LV_USE_BUILTIN_MALLOC=y

# LVGL Feature Configuration
CONFIG_LV_COLOR_DEPTH_16=y
CONFIG_LV_FONT_MONTSERRAT_16=y
CONFIG_LV_USE_LABEL=y

# LVGL Logging
CONFIG_LV_USE_LOG=y
CONFIG_LV_LOG_LEVEL_ERROR=y

# Coredump configuration for debugging faults
CONFIG_DEBUG_COREDUMP=y
CONFIG_DEBUG_COREDUMP_BACKEND_LOGGING=y
CONFIG_RESET_ON_FATAL_ERROR=n
CONFIG_ASSERT=y
CONFIG_SYS_HEAP_VALIDATE=y
CONFIG_SYS_HEAP_RUNTIME_STATS=y
CONFIG_THREAD_NAME=y

/*
 * Copyright (c) 2018 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */

#include <zephyr/types.h>
#include <stddef.h>
#include <string.h>
#include <errno.h>
#include <zephyr/sys/printk.h>
#include <zephyr/sys/byteorder.h>
#include <zephyr/kernel.h>
#include <zephyr/logging/log.h>
#include <zephyr/drivers/gpio.h>
#include <soc.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/spi.h>
#include <lvgl.h>
#include <app_version.h>
#include <zephyr/drivers/display.h>
#include <zephyr/debug/coredump.h>

LOG_MODULE_REGISTER(app, LOG_LEVEL_DBG);

static const struct device *display_dev  = DEVICE_DT_GET(DT_CHOSEN(zephyr_display));

static int display_manager_init(void) 
{
    LOG_DBG("Initializing display manager");

	if (!device_is_ready(display_dev)) {
		LOG_ERR("Device not ready, aborting test");
		return -1;
	}

	LOG_DBG("Display name: %s", display_dev->name);

    display_blanking_off(display_dev);
    
    return 0;
}

int main(void)
{
	LOG_DBG("Display Hello World! %s (%s)", CONFIG_BOARD, APP_VERSION_EXTENDED_STRING);

	display_manager_init();

	lv_init();

    lv_obj_t *label = lv_label_create(lv_scr_act());
    lv_label_set_text(label, "Hello World");
    lv_obj_center(label);

	for (;;) {
		lv_timer_handler();
		k_msleep(10);
	}
}

nRF5340DK ILI9341 Display Secure Fault for LVGL Draw Function

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