The interrupt timing of IRQ_DIRECT_CONNECT is different from expected.

[sst_S.Sakamoto]

Hello,

Currently, I am creating firmware that generates an IRQ_DIRECT_CONNECT interrupt at the timing when SPIM4 transfer is completed (ENDTX).

However, the interrupt timing is not at ENDTX but near the start of SPIM4 operation.

Since an interrupt occurs at the start, the current process is waiting for the ENDTX event within the interrupt. How should I set it to generate an interrupt at ENDTX?

IRQ_DIRECT_CONNECT and irq_enable settings:

IRQ_DIRECT_CONNECT(SPIM4_IRQn, 0,spim4_event_handler,IRQ_ZERO_LATENCY);
irq_enable(SPIM4_IRQn);

Interrupt handler settings:

static void spim4_event_handler(nrfx_spim_evt_t const*p_event, void *p_context)
{	
	while(NRF_SPIM4->EVENTS_ENDTX == 0){;}
	NRF_SPIM4 -> EVENTS_ENDTX = 0x00000000; 
}

Register settings before data transfer:

NRF_SPIM4 -> INTENCLR = 0x00080152;
NRF_SPIM4 -> INTENSET = 0x00000100;

Register settings after data transfer:

NRF_SPIM4 -> INTENCLR = 0x00000100;

best regard,

[Menon]

Hello,

I wanted to let you know that I have been assigned to this case and have started looking into it. Could you share some details, like which Nordic device and SDK version you are using here?

 

Kind Regards,

Abhijith

[sst_S.Sakamoto]

Hello,

I am using the following devices and development kits:

Device: NORA-B106-00B (nRF5340)

nRF Connect SDK: 2.0.2

best regards,

[Menon]

Hello,

Sorry for the delay in response. We are having Easter vacation here in Norway, and we are only very few working. You can expect a response by tomorrow.

Sorry if this is creating any inconvenience for your development.

 

Kind Regards,

Abhijith

[Menon]

Hello,

I think the SPIM peripheral in the nRF5340 does not directly support an ENDTx interrupt. Using a GPIO pin to monitor the state of the SPI lines (MISO or MOSI) and then configuring the GPIO pin to generate an interrupt when the line state changes such that it indicates the end of the transmission will be a solution for your use case. You can also consider using the software interrupt. Take a look at this thread, which explains this a bit briefly.

Please expect a delay after this response. I will be responding after Tuesday next week, as it is Easter vacation here in Norway.

 Kind Regards,

Abhijith

[sst_S.Sakamoto]

Hello,

Thank you for your reply.

Although the nRF5340's SPIM peripheral does not directly support ENDTx interrupts, SPIM4_IRQn was defined in the include file nrf5340_application.h.

Currently, the ENDTx interrupt is working in the program, but is there a concrete way to trigger it with ENDTx?

best regard,