NRF54L15 wedging when starting BLE advertising, peripheral_uart sample

Question

Hi,

I'm working on software for a design incorporating an Ezurio module that uses an NRF54L15 chip.

I'm currently using the peripheral_uart example as a base for early experimentation, but the main() function code doesn't seem to be getting past advertising_start() function, it seems to end up wedged, I think mostly because the higher priority sysworkq task is erroring deep within bt_le_adv_start() from adv.c, ultimately ending with error -5 / EIO, and getting stuck in some sort of constant retry loop that prevents the main task ever getting any more cycles (or at least, other stuff in general to do with advertising in other tasks is taking up all the CPU time).

I think I've obviously got some sort of configuration error somewhere, probably from my cack-handed attempts at all this device tree and kconfig stuff, which I'm not entirely used to. I mostly based the device tree on the ezurio dev kit sample board in the zephyr github (at the moment the released sdk doesn't seem to have it, the perils of using new hardware), pruned to the basics. I suspect I've probably just pruned out some prerequisite peripheral somewhere, and it would be useful to have pointers to anything obvious I've missed.

I'm using the VScode based Nordic SDK stuff v3.0.2 on Windows 10, and a Segger J-link Plus as a debugger. The connected devices panel says the module uses a xxAA_ENGB stepping of the chip.

Extra Kconfig fragments:

CONFIG_CACHE_MANAGEMENT=y
CONFIG_HW_STACK_PROTECTION=y
CONFIG_GPIO=y
CONFIG_SERIAL=y
CONFIG_LOG=y
CONFIG_ASSERT=y
CONFIG_CONSOLE=y
CONFIG_BT_NUS=y
CONFIG_HEAP_MEM_POOL_SIZE=2048
CONFIG_BT_PERIPHERAL=y
#CONFIG_BT_SETTINGS=n
CONFIG_BT_MAX_PAIRED=1
CONFIG_BT_DEVICE_NAME="Shenanigans"
CONFIG_PARTITION_MANAGER_ENABLED=y
CONFIG_USE_SEGGER_RTT=y
CONFIG_ARM_MPU=y
CONFIG_EXTERNAL_CACHE=y
CONFIG_FLASH=y
#CONFIG_CLOCK_CONTROL_NRF_K32SRC_SYNTH=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y
CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC_CALIBRATION=y
CONFIG_UART_CONSOLE=y
CONFIG_UART_ASYNC_API=y
CONFIG_BT=y
CONFIG_DEBUG_THREAD_INFO=y
CONFIG_LOG_PRINTK=n
CONFIG_LOG_BACKEND_UART=n
CONFIG_LOG_BACKEND_RTT=y
CONFIG_FLASH_MAP=y
CONFIG_DEBUG_OPTIMIZATIONS=y
CONFIG_BT_NUS_SECURITY_ENABLED=n
CONFIG_NRF_GRTC_START_SYSCOUNTER=y

Device tree:

/dts-v1/;
#include <nordic/nrf54l15_cpuapp.dtsi>
#include "testdevicev1-pinctrl.dtsi"

/ {
	model = "Foobar Test Device";
	compatible = "foobar,testdevicev1-cpuapp";

	chosen {
		zephyr,code-partition = &slot0_partition;
		zephyr,sram = &cpuapp_sram;
		zephyr,console = &uart20;
		zephyr,shell-uart = &uart20;
		zephyr,uart-mcumgr = &uart20;
		zephyr,bt-mon-uart = &uart20;
		zephyr,bt-c2h-uart = &uart20;
		zephyr,flash-controller = &rram_controller;
		zephyr,flash = &cpuapp_rram;
		zephyr,ieee802154 = &ieee802154;
	};
};

&cpuapp_sram {
	status = "okay";
};

&grtc {
	owned-channels = <0 1 2 3 4 5 6 7 8 9 10 11>;
	/* Channels 7-11 reserved for Zero Latency IRQs, 3-4 for FLPR */
	child-owned-channels = <3 4 7 8 9 10 11>;
	status = "okay";
};

&cpuapp_rram {
	partitions {
		compatible = "fixed-partitions";
		#address-cells = <1>;
		#size-cells = <1>;
		boot_partition: partition@0 {
			label = "mcuboot";
			reg = <0x0 DT_SIZE_K(64)>;
		};
		slot0_partition: partition@10000 {
			label = "image-0";
			reg = <0x10000 DT_SIZE_K(324)>;
		};
		slot0_ns_partition: partition@61000 {
			label = "image-0-nonsecure";
			reg = <0x61000 DT_SIZE_K(324)>;
		};
		slot1_partition: partition@b2000 {
			label = "image-1";
			reg = <0xb2000 DT_SIZE_K(324)>;
		};
		slot1_ns_partition: partition@103000 {
			label = "image-1-nonsecure";
			reg = <0x103000 DT_SIZE_K(324)>;
		};
		/* 32k from 0x154000 to 0x15bfff reserved for TF-M partitions */
		storage_partition: partition@15c000 {
			label = "storage";
			reg = <0x15c000 DT_SIZE_K(36)>;
		};
	};
};

&gpiote20 {
	status = "disabled";
};

&uart20 {
	current-speed = <115200>;
	pinctrl-0 = <&uart20_default>;
	pinctrl-names = "default";
	hw-flow-control;
	status = "okay";
};

&uicr {
	status = "okay";
};

&gpiote30 {
	status = "okay";
};

&power {
	status = "disabled";
};

&regulators {
	status = "okay";
};

&lfxo {
 	load-capacitors = "internal";
 	load-capacitance-femtofarad = <15500>;
 };

&hfxo {
	load-capacitors = "internal";
	load-capacitance-femtofarad = <15000>;
};

&gpio1 {
	status = "disabled";
};

&gpio2 {
	status = "okay";
};

&pinctrl {
	uart20_default: uart20_default {
		group1 {
			psels = <NRF_PSEL(UART_TX, 2, 2)>,
					<NRF_PSEL(UART_RX, 2, 0)>,
					<NRF_PSEL(UART_RTS, 2, 5)>,
					<NRF_PSEL(UART_CTS, 2, 4)>;
		};
	};
};

&temp {
	status = "okay";
};

&egu10 {
	status = "okay";
};


&vregmain {
	status = "okay";
	regulator-initial-mode = <NRF5X_REG_MODE_DCDC>;
};


&radio {
	status = "okay";
};

&ieee802154 {
	status = "okay";
};

&uart20 {
	status = "okay";
};

&clock {
	status = "okay";
};

&lfxo {
	status = "okay";
};

&cpuapp_systick {
	status = "okay";
};

The sample was edited to comment out the non-existent buttons / LEDs, but is otherwise just the basic sample.

Thank You,

Peter Davis