LAUNCHXL-F28P65X: Problems/Questions with SPI W5500 and 16-Bit architecture

Tool/software:

Hello,

I am trying to connect the TMS320F28P650DK9 via SPI to the W5500 (Wiznet). But I think there are some problems here, so some questions to the community.

the C2000 are 16-bitters, which means that I always have to transfer at least 2 bytes, regardless of the protocol, peripherals, etc. (is this true?). (is this statement correct?)

Now I have the feeling that this is overwriting data on the SPI slave.

In this picture from the datasheet of the w5500 only 1byte of data is transferred but let's assume we want to transfer 2byte.

So if I want to transfer e.g. 5byte, because the slave device, the w5500 expects this, or SPI frame: 2byte ADR + 1 byte control + 2 byte data then I have to transfer 6byte with the c2000 and then I assume that this additional byte is written in a wrong register of the w5500. In any case, my written values do not match the read values.



Also with the read command is a problem cause it expected 3Bytes 

but what i send are 4 bytes

I have tried to use the c library from Wiznet: ioLibrary_Driver/Ethernet at master - Wiznet/ioLibrary_Driver - GitHub

I have written an additional typedef:

#ifndef int8_t
    typedef int16_t		int8_t;
#endif
#ifndef uint8_t
    typedef uint16_t	uint8_t;
#endif

Are my statements correct? and has anyone by chance ever had the two chips working together? The task results from the fact that the TMS320F28P650DK9 is the only high-performance chip with a lockstep processor. However, it "only" has EtherCat and I absolutely need an Ethernet interface.

Best regards

Hans