topic Re: lpspi polling b2b master example code doesn't work iMXRT1170 EVK boards in i.MX RT Crossover MCUs

lpspi interrupt b2b master example code doesn't work iMXRT1050

michaeldkfowler — Thu, 21 Jul 2022 18:50:25 GMT

I have imported the lpspi_interrupt_b2b_master example for the MIMXRT1050-EVKB. When I changed the SPI transfer size from 64 bytes to 24, it worked. When I changed the transfer size to less than 24, like 16, it didn't work anymore. Why can't I transfer less than 24 bytes?

Re: lpspi interrupt b2b master example code doesn't work iMXRT1050

Pavel_Hernandez — Mon, 25 Jul 2022 21:41:38 GMT

Hello,

I replayed this example on my own, unfortunately, I have the same issue but I tested 8, 15, and 17 transfer sizes, I hope this helps you.

Best regards,
Pavel

Re: lpspi interrupt b2b master example code doesn't work iMXRT1050

michaeldkfowler — Wed, 27 Jul 2022 22:54:31 GMT

So you will fix the SDK?

Re: lpspi interrupt b2b master example code doesn't work iMXRT1050

Pavel_Hernandez — Thu, 28 Jul 2022 22:47:39 GMT

Hello,

I will make a report and when I have more information I will contact you.

Best regards,
Pavel

Re: lpspi interrupt b2b master example code doesn't work iMXRT1050

Pavel_Hernandez — Thu, 11 Aug 2022 16:49:40 GMT

Hello,

We are working on this issue, thanks for the report. unfortunately, I don't know how much time would take for the new release.

Best regards,
Pavel

Re: lpspi interrupt b2b master example code doesn't work iMXRT1050

Pavel_Hernandez — Thu, 18 Aug 2022 17:00:41 GMT

Hello,

I'm back with feedback this is a temporary patch, please help evaluate it.

One known limitation is, the maximum frame length is 512 bytes, and it is from LPSPI IP limitation when work in non-continuous mode.

If the issue still please let me know.
Pavel

Re: lpspi polling b2b master example code doesn't work iMXRT1170 EVK boards

Ravi07011983 — Sun, 22 Feb 2026 14:55:44 GMT

Sir,

We are working on LPSPI polling b2b master imported SDK example code but we are unable to see the clock and data dout in oscilloscope.

MIMXRT1170-EVK boards We are using pins are GPIO_AD_28 for LPSPI1_SCK, GPIO_AD_29 for LPSPI1_PCS0, GPIO_AD_30 for LPSPI1_SDO, GPIO_AD_31 for LPSPI1_SDI.Slave IC CC REF U27 LPSPI Flash.

Request to provide the solution or forward to LPSPI Master full working code.