SPIS ENDRX event not working

[Luca]

Hi, On the custom board I'm working on an nRF52832 uses the SPIS port with no CS signal (because of the HW connection with the master side of the bus). Since the internal hw semaphore implemented on the SPIS module, I have to toggle a local CS signal to end the reception and trigger the SPIS event handler. The way I'm trying to do it is by configuring an event on the SPIS END_RX (EVENTS_ENDRX) and a task on an output pin, so that when I've received the amount of data I'm expecting, I set the CS and I get the SPIS event handler executed.

I enable the ENDRX event with the following code: NRF_SPIS0->INTENSET |= SPIS_INTENSET_ENDRX_Msk;

The problem is that the ENDRX event doesn't seem to work. I've set the length of my SPIS buffer to 5, but I don't get anything on the EVENTS_ENDRX register (address 0x40003110, I'm using SPIS0) after several bytes received (while CS is constantly low).

Any idea why the ENDRX doesn't work?

Thanks, Luca

[FormerMember]

For transmission/reception is completed, do you receive the event EVENTS_END?

[Luca]

Yes, when the CS goes high. But I also want to get the interrupt when the buffer is full (ENDRX event).

[FormerMember]

Okay, I see. Could you try the following, and check if it makes any difference: NRF_SPIS1->INTENSET |= (SPIS_INTENSET_ENDRX_Enabled << SPIS_INTENSET_ENDRX_Pos);

[veletron]

Hi

Did you ever get this working. I am in the same boat, the master hold CS Low beyond the end of the transfer as it expects to get the ACK/NAK before CS is released (raised). I need an 'end' event once my SPIS buffer (8 bytes) has been filled by the SPI Master.

Nigel

[Luca]

Hi,

It's been a while now.. but no, we had to use the SPIS CS signal to end the transaction.

Luca