i.MX RT Crossover MCUsのトピックRe: RT1020 FlexSPI flash R/W conflict with timer and RTOS

RT1020 FlexSPI flash R/W conflict with timer and RTOS

carsoftlai — Mon, 19 Aug 2019 10:22:28 GMT

Hello, I'm using RT1021CAG4A with 8MB nor flash for development, due to code size just 200KB, so I plan using rest of it for data logging, but I figured out FlexSPI flash R/W will conflict with timer and RTOS, what can I work it out?

Re: RT1020 FlexSPI flash R/W conflict with timer and RTOS

jeremyzhou — Tue, 20 Aug 2019 01:13:57 GMT

Hi Carsoft Lai ,

Thank you for your interest in NXP Semiconductor products and
for the opportunity to serve you.
Actually, I'm not very clear with the mean of 'I figured out FlexSPI flash R/W will conflict with timer and RTOS ', whether you can clarify this conflict phenomenon in details.

TIC

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Re: RT1020 FlexSPI flash R/W conflict with timer and RTOS

carsoftlai — Tue, 20 Aug 2019 02:13:26 GMT

Hi Jeremy,

Thank you for reply, you can duplicate this issue by SDK sample code "evkmimxrt1020_flexspi_nor_polling_transfer" + "qtmr_timer" on MIMXRT1020-EVK, then sample code will crash on flexspi_nor_flash_erase_sector(), while timer is ON. And RTOS will be the same thing.

Re: RT1020 FlexSPI flash R/W conflict with timer and RTOS

jeremyzhou — Wed, 21 Aug 2019 02:44:27 GMT

Hi Carsoft Lai ,

Thanks for your reply.
In your testing, whether the integrated demo project is running in the QSPI flash.

TIC

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Re: RT1020 FlexSPI flash R/W conflict with timer and RTOS

carsoftlai — Wed, 21 Aug 2019 03:53:37 GMT

Hi Jeremy,

Yes, the integrated demo project is running in the QSPI flash.

Re: RT1020 FlexSPI flash R/W conflict with timer and RTOS

jeremyzhou — Fri, 23 Aug 2019 02:58:26 GMT

Hi Carsoft Lai，

Thanks for your sharing.
In general, the QSPI flash can't support to execute the code and, meanwhile writing or program itself, otherwise, the code will crash.
So you can try these below two suggestions to avoid this phenomenon.
1. It needs to copy the flesSPI driver function to the other memory likes the SDRAM or RAM prior to the calling them.
2. Some QSPI (for instance ATXP032/064) support Read-While-Write capability which allows writing to the flash array at the same time as code is being fetched from a different part of the array and enables firmware updates and data logging without the need for additional data storage devices in the system, maybe you can give a try.

TIC

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