there are 10us delay between nrf5340 spi write and read sequence

[sunnyyang]

hi professor,

I use the zephyr spi driver to control spi nand flash.I want to send two bytes and read 3 bytes. But between write and read time sequence there are 10us delay.

As shown as the blow picture,the first 16 clocks to write, after Interval 10us 24 clocks to read.

How can I make the write and read sequence continue?

[Simon]

I'm not sure if I understand this question: "How can I make the write and read sequence continue?" Can you elaborate?

[sunnyyang]

I want the clock to be continuous for read and write operations.Now The interval between write and read operations is 10us.

[Simon]

Ah, okay. I understand. I'll look into it tomorrow.

Best regards,

Simon

[sunnyyang]

hi simon，

Please could you advise me what I should do?

[Simon]

I tested this out myself and got about the same result as you. I tried to write to a register of an adxl362 and then read it, and checked the lines on a logic analyzer.

I guess around 10us is what the CPU needs in order to execute the necessary instructions in order to set up and execute and spi read.

I'll take a closer look at it tomorrow and try to give you a more detailed answer.