topic Re: SPI interface with NOR Flash MX25L4006E in i.MX RT Crossover MCUs

SPI interface with NOR Flash MX25L4006E

farid_mabrouk — Sun, 20 Dec 2020 07:07:03 GMT

I am trying to interface with this LPSPI flash: https://static6.arrow.com/aropdfconversion/74f71a4d24defb900f21183aac8a0329d8ea28d0/mx25l4006e203v204mb20v1.7.pdf

using LPSPI on IMX RT1062. I need to send 256 bytes of data plus 4 bytes of command ( as per page 41 figure 22 of the datasheet). I figured I need to have 2080 bits per frame ( 2080 spi clock cycles): masterConfig->bitsPerFrame = 2080.

but this does not seem to work. When I look at the data I want to send on the scope, it appears it somehow changed: not correct

Is it even possible to send a total of 260 bytes in a single transfer? if so please advise how?

https://static6.arrow.com/aropdfconversion/74f71a4d24defb900f21183aac8a0329d8ea28d0/mx25l4006e203v204mb20v1.7.pdf

Thank you

Re: SPI interface with NOR Flash MX25L4006E

jeremyzhou — Mon, 21 Dec 2020 02:59:53 GMT

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
To provide the fastest possible support, I'd highly recommend you refer to the LSPI demo in the SDK library to do that.

Have a great day,
TIC

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Re: SPI interface with NOR Flash MX25L4006E

farid_mabrouk — Mon, 21 Dec 2020 06:05:02 GMT

Thanks for your reply.

I looked at the example code you have for LPSPI and I even implemented SPI interfaces for 4 bytes transfer in the past, I want to know how you send 64 bytes in a single transfer. can you send some psuedo code?

Re: SPI interface with NOR Flash MX25L4006E

fmabrouk — Mon, 21 Dec 2020 19:43:57 GMT

Please see attached screen shot:

I am trying to send a sequence of bytes from 0x00 to 0x09. It looks like the SPI driver takes the first 4 bytes and send them starting from the MSB byte and then takes the next 4 bytes and so on..

I need to send Byte by Bytes starting either from the MSB byte or LSB bytes in the array. How do I need to set up my SPI to get what I want.

Your help is urgently needed!

Re: SPI interface with NOR Flash MX25L4006E

jeremyzhou — Tue, 22 Dec 2020 09:31:13 GMT

Hi,
Thanks for your reply.
According to your statement, you want to continue to transfer a series of data while keeping PCS asserted, isn't my understand right?
If yes, the LPSPI supports this continuous transfer feature, the below figure shows the continuous transfer state, it indicates the dynamic signals when the MCU run the lpspi_edma_b2b_transfer_master demo.

Have a great day,
TIC

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Re: SPI interface with NOR Flash MX25L4006E

fmabrouk — Tue, 22 Dec 2020 18:02:19 GMT

Great! I fixed my issue.

what is the maximum clock frequency this LPSP peripheral support?

Regards,

Farid

Re: SPI interface with NOR Flash MX25L4006E

jeremyzhou — Wed, 23 Dec 2020 02:24:05 GMT

Hi,
Thanks for your reply.
1) What is the maximum clock frequency this LPSP peripheral support?
-- The maximum clock frequency of LPSPI is 30 MHz, it mustn't exceed this frequency.
Have a great day,
TIC

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Re: SPI interface with NOR Flash MX25L4006E

fmabrouk — Mon, 04 Jan 2021 20:52:58 GMT

Thank you for your help!