LPSPI after Lpspi_Ip_AsyncTransmit stays in BUSY state

[sstelmak]

Lpspi_Ip_AsyncTransmit() call gets executed once with expected  SPI waveforms.

Other calls are rejected because drives stays in LPSPI_IP_BUSY state.

I have a workaround to call Lpspi_Ip_Cancel() when BUSY state is reported:

if (Lpspi_Ip_GetStatus() == LPSPI_IP_BUSY) Lpspi_Ip_Cancel();

Lpspi_Ip_AsyncTransmit();

This works but I won't want to keep using that cancel call.

What can keep driver in BUSY state even after all needed data are properly Tx/Rx by SPI?

I use RTD 4.0.0, SPI with Tx/Rx DMA channels. DMA does not have global/transfer/scatter configs, also no interrupt callback.

[danielmartynek]

Hi @sstelmak,

I understand the driver never becomes IDLE after the transfer.

It would help if you could share the project so that I can test it.

Did you enable DMA interrups in the IntCtrl_Ip driver?

Regards,

Daniel

[sstelmak]

Hello,

I can't post entire project per company policies, it would be ok to email it directly.

Attached is the mex and few relevant c files. 

DMA or SPI interrupts are not configured. This is because I have restriction for micro throughput and looking for possibility to skip unnecessary calls.

[danielmartynek]

Hi @sstelmak,

The driver requires the DMA interrupts.

Have a look at the Lpspi_Flexio_Ip_Transfer_S32K344 example, where the FlexIO_SPI driver uses DMA.

BR, Daniel

[sstelmak]

Hello,

I added DMA ISRs (I use same DMA channels as the example) to IntCtrl_Ip

Nothing changed after that, and I didn't see that any of those interrupts were called.

[danielmartynek]

Try enabling Global config in the in the DMA driver.

Please share the whole project (or a test project that can demonstrate the issue,) so that I can test it.

Thank you,

BR, Daniel