DMA SPI need 2 read S2LP Module

[Quentin_27]

Hi everyone,
I'm currently working on project witch use SPi with DMA and S2LP Module

I have a function that initializes the DMA portion :

In my code I try to read information in DMA through the SpiritDeviceVersion and SpiritReadnbinfifo functions:

However, I get my data, but only when I call a DMA read 2 times :

nbOctetRecuB = the value I should read from nbOctetRecuA (0xC1)

nbOctetRecuB2 = the value I should read from nbOctetRecuB (0x0A, my FIFO element count)

nbOctetRecuC = the value I should read from nbOctetRecuB2 (0x0A, my FIFO element count) => whereas I expect 0xC1.

Below are one of those function:

I don't understand witch element is missing, why i need to perform another DMA operation to get my data ?

Just a heads-up, a double DMA operation is needed : so if I read S2LP register with DMA, and after Reread DMA without using SPI (ex no CS command) i get my data, this is what it tell me the problem isen't from the SPI ?

Is anyone get tis issue ?

Tanks for your time, Regards.

[mƎALLEm]

Hello @Quentin_27 ,

Please use </> button to share your code instead of pasting screenshots. Please read How to insert source code.

Thank you for your understanding.

[Andrew Neil]

Does it work OK without DMA ?

Have you used an oscilloscope or logic analyser to see what's actually happening on the SPI wires?

[Quentin_27]

Hi,

Yes it works without DMA,

All is correct on SPI Wires as you can see below  (Last ligne is CS#, Frequency 1MHz, and I have try 4MHz):

Tanks for your time, Regards.