Hi Jorgen!
it seems that you have already achieved using SPI mode, !
Could you please show me how to change the trf7970a from direct mode to SPI, except for the way described in trf7970a evm user guide which says:
"""""When the SPI interface is selected, the unused I/O_2, I/O_1, and I/O_0 pins must be hard-wired as shown
in Table 5-9. At power up, the TRF7970A samples the status of these three pins and then enters one of
the possible SPI modes.""""""
I mean if there is another way such as sending ascii commands or updating firmware with a new version!!
Kind Regards