Using a SPI module.

You should read the documentation provided with the core.

If you dont have documentation, then find another core, or investigate how this one works.

Where did you get this code from?

Hi Tricky,

Let me put it this way - do you have any working SPI module? If so - can you provide a practical example how to use it?

I don't know the origin of SPI core I provided but I know for sure it's a working code cause it was used before. No I can't look at the previous use of the module - i don't have it.

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Suppose I have an SPI module. SPI_Wr_Data is a byte to send (8 bit). SPI_Wr_Start_Trig is a trigger to start byte transfer. How should I implement user logic to send several bytes?

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If you have no documentation - I suggest finding a core that does have documentation and probably a testbench.

From a brief look at this code, wr_start_trig starts sending a single byte. So for several bytes you just assert wr_start_trig at the start of every byte.

I see. Thank you. I thought so. Is it right to do so?

--first byte

SPI_Wr_Data <= "00000001";

trigger <= '1';

SPI_Wr_Start_Trig <= trigger;

--??? delay?

trigger <= '0';

SPI_Wr_Start_Trig <= trigger;

--second byte

SPI_Wr_Data <= "00000011";

trigger <= '1';

SPI_Wr_Start_Trig <= trigger;

trigger <= '0';

SPI_Wr_Start_Trig <= trigger;

--and so on...

Steps for success:

1. Write your user logic

2. Write a testbench containing your user logic and the SPI module

3. test and debug

4. ????

5. Profit!!