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about STM32L4R5ZI octo-spi

djin.9
Associate

I am using NUCLEO-L4R5ZI.

I already know about datasheet and application note.

I generated code using by CubeMX. And I use peripheral LPUART and OCTOSPI.

Nucleo board is connected to FPGA board.

FPGA board don`t have flash memory(micron or macronix). But I made code micron mode.

I made code for access my register which is placed in FPGA. And my code is running well.

However I have problem about 1 byte writing.

Q1. In data region, I understood that setting "sCommand.NbData = 1;" means 1 byte

processing.

But, one more Octo SPI clock occurs in data region.

This clock signal is same when setting "sCommand.NbData = 2;".

If NbData is 2,3,4,5 or more, clock signal is working well.

In my project, I don`t need one more clock and it incur fail result even if Data is zero.

Why does one more clock occur when setting "sCommand.NbData = 1" ?

Q2. I made another code for writing 1byte. setting the Data is none and I used alternate

region. It looks like working well.

But, if octopo-spi is controlled after the printf (LPUART) function, a malfunction occurs.

Address and Data exist in data line. but it`s not placed in SPI clock rising edge.

If not use printf function before octo-spi control, Address and Data is placed in rising

edge.

I don`t know why printf (LPUART) function affects octo-spi.

Please, explain me about this situation.

Q3. When writing many bytes, the data is delayed by 10us every 4 bytes.

Is there a way to transfer without delay?

Please reply to my question.

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