SPI MQX set delays

cwati — Thu, 30 Apr 2015 18:25:29 GMT

Hi there,

I've been trying to port some SPI code from basic KSDK 1.0.0 to MQX 4.1 (SPI not SPI legacy).

Code works smoothly in KSDK 1.0.0, but I notice some timing issues in MQX 4.1.

We use the following set delays in KSDK. Is there similar set delay functionality in MQX for SPI?

status = DSPI_DRV_MasterSetDelay(instance,

kDspiPcsToSck,

500, // delayInNanoSec

& calculatedPcsToSck);

if (status != kStatus_DSPI_Success)

return false;

status = DSPI_DRV_MasterSetDelay(instance,

kDspiLastSckToPcs,

500, // delayInNanoSec

& calculatedLastSckToPcs);

if (status != kStatus_DSPI_Success)

return false;

status = DSPI_DRV_MasterSetDelay(instance,

kDspiAfterTransfer,

500, // delayInNanoSec

& calculatedAfterTransfer);

if (status != kStatus_DSPI_Success)

return false;

Thanks,
Cecylia

Re: SPI MQX set delays

cwati — Thu, 30 Apr 2015 22:05:08 GMT

Hmmmpf, doesn't seem like MQX has explicit IOCTLs to set delays (KSDK "DSPI_DRV_MasterSetDelay") but if you set the baud rate correctly, MQX' "_dspi_find_baudrate" will resolve it for you.

Re: SPI MQX set delays

danielchen — Mon, 04 May 2015 12:12:03 GMT

I think in mqx, you can use wait function, but the resolution is not fine. Thank you for your sharing.

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SPI MQX set delays

Re: SPI MQX set delays

Re: SPI MQX set delays