On RPC interrupt priority

[mingjkl]

I encountered problems in developing nrf5340 with nck v1.5.0.

I use nrf_rpc_tr_init(rpc_receive_handler) to initialize an RPC and IRQ_DIRECT_CONNECT(I2S0_IRQn, 0, custom_i2s_irq_handler, 0)  to connect an I2S interrupt. When triggering  interrupt, which one of RPC and I2S has the highest interrupt priority?

[Susheel Nuguru]

I am not sure if I understand your question!!

What do you mean which one has the priority  (RPC/I2S) when an interrupt is triggered? which interrupt is triggered?

[mingjkl]

I want to know where the interrupt of RPC is configured, and which has a higher priority than the interrupt of other peripherals, such as I2S.

[Susheel Nuguru]

RPC is using nRF IPC. 
In the file zephyr\dts\arm\nordic\nrf5340_cpuapp_peripherals.dtsi you see that 

ipc: ipc@2a000 {
	compatible = "nordic,nrf-ipc";
	reg = <0x2a000 0x1000>;
	interrupts = <42 NRF_DEFAULT_IRQ_PRIORITY>;
	status = "okay";
	label = "IPC";
};

in zephyr\dts\arm\nordic\nrf_common.dtsi you have 

#define NRF_DEFAULT_IRQ_PRIORITY 1

So RPC are working with driver with interrupt priority 1. You can also read the value from the NVIC registers

[mingjkl]

Oh, that's it. Thank you for your support.