Model-Based Design Toolbox (MBDT)中的主题 MBD TOOLS :S32K144 SPI interface application problem

MBD TOOLS :S32K144 SPI interface application problem

liuqimin — Thu, 03 Dec 2020 06:15:04 GMT

There is a SPI interface application problem. When I send an array with the following structure, the configuration of SPI is as shown in the figure below.

In this case, is the sending order of the array 0->1? Another question is: Will the SPI interface automatically stop sending after the array is sent?

My application needs to stop immediately after sending an array and wait for another array to be sent.

Best Regards!

Qimin Liu

Re: MBD TOOLS :S32K144 SPI interface application problem

mariuslucianand — Thu, 03 Dec 2020 10:59:40 GMT

Hello @liuqimin

The sending order is 0 1 2 3 4, I have replicated your mentioned scenario and had a look on the bus with a logic analyzer.

The SPI will send the uint8_t array and then stop, as you can see in the previous screenshot. You have selected the Continous transfer option, so the CS pin is set low at the beginning of the transfer and set high at the end.

Also, I've noticed that the data type of your transferred variables is double, so please check to be uint8.

Hope this helps,

Marius

Re: MBD TOOLS :S32K144 SPI interface application problem

liuqimin — Thu, 03 Dec 2020 12:14:14 GMT

Hi Marius

Thanks for your reply.

This state is exactly what I need.

If the SPI interface is connected to the back of a finite state machine, and the state machine modifies this array from time to time, can the SPI interface be sent correctly? The actual connection is as shown below.

The previous picture is just an example, the actual data sent is in uint8 format, thank you for your reminder

Best Regards!

Qimin Liu