SPI configuration MODEL based design tool box- 32 bit instruction (SIMULINK)

[kamalwolly]

Hi,

I am having problems setting the word length of the SPI channel 0 buffer to 32 bits from the default 8 bits it comes in. When I do via S32 config studio.  The clock is stuck on low as seen on the logic analyzer, although the data I am writing is unit8 at that point.  

When I change the data I am writing to the  buffer to uint32 from uint8 the model wouldn't compile because the SPI block is expecting uint8 even after I've changed it to 32.,

regards.

So I guess my question is can the SPI be configured for 32 bit word length,

btw my reference examples are: Asynchronous polling  Master and Asynchronous Interrupt Master

from the Library browser in Simulink 

thanks 

[Irina_Costachescu]

Hi @kamalwolly 

SPI can be configured for 32 bits word length, and the update you made in the S32 Configuration Tools project (setting the channel's data width to 32) is right.

Now, in Simulink, for writing 32 bits to the buffer, you need to provide the data as an array of uint8 values. In this particular case, you would need 4 values (to get the 32 bits in total). I have attached a screenshot with the data store memory block settings.

Hope this helps,

Irina

[kamalwolly]

New error, the SPI block is expecting a 1 dimensional vector with 1 element and the Memory store is sending a one dimensional vector with 4 elements hence data mismatch, Attached is the error and the block that I'm using to send the information to the SPI buffer

quick side question, the onboard debugger usb on my board ripped off, I want to get an external debugger that still keeps the Simulink to S32K3 workflow with no intermediaries. 

below is an external debugger based on the one on the S32k3 eval-board. looking to purchase this. does NXP have any suggestions for an external debugger that integrates with the MBDT. and would the external debugger from P& E micro work

Multilink Debug Probes | Debug Probes for many ARM and 8-/16-/32-bit devices | PEmicro

[Irina_Costachescu · Accepted solution]

Hi @kamalwolly ,

If you click on the 'Output Port 1' link in the error message, the Dest Data output of the SPI block will be highlighted in red. So, this error states that the SPI block will output a one dimensional vector with 4 elements, while the data store memory block that keeps the received data is a one dimensional vector with 1 element.

The SPI block sets the transfer width according to its input, therefore, for also receiving 32 bits data, you need to do the same setting on the recv data store memory block (configure it as an array with 4 uint8 data type values).

As for the debugger, the P&E micro Multilink Universal should work.

Regards,

Irina