RM42 SPI slave receiving four 16 bits words

Well, my master sends for example 0xFFFF 0x0001 0x0000 0x5555. The chip select is low during this transmission.
With the RM42 in slave mode, i can read 0xFFFF 0x5555. That's all.
The Interrupt function is called 2 times instead of 4.

The character length is defined as 16 bits.

If someone should help me it could be great.

Thanks all.

Hello Pierre Kohler,

I will check with our SPI experts on the CSHOLD behavior in slave mode and let you know on this.

But with what you have mentioned, can you pls check the Overrun flag as well in your ISR once before you read the received data ?

Hello,
Firstly, i thank you for your response.
In my interrupt function i check the overrun flag with a if ((spiREG1->FLG & 0x40U) == 1U) overrun_cnt++

Then in my main function i read the overrun_cnt variable but it is stuck to 0.

So my overrun flag is never up.

Pierre

Hi again,

Actually i did it wrong. So now i check my overrun flag and i can observe it up 2 times.
So i send 4 words with my master, and i receive 2 words with my slave, and the iverrun flag is up 2 times. I tried to use some dummy reads but there's no effect.

Regards

Hi,

My problem is resolved. I was debugging with some printfs using the Jtag connection in my main loop. That take a lot of time. So i had to wait more between each word transmitting with the master. Now i've removed all my printf and it works perfectly.
I really thank you for your help.

Best Regards.

P.K