CCS/LAUNCHXL-F28379D: F28379D could not assign GPIO29 for SPI Master transfer block at external mode.

Tool/software: Code Composer Studio

Howdy,

I use MATLAB/Simulink interface with embedded support packages c2000 to generate code.

I use two Booster packs DRV8711 with Launchpad F28379D. In order to run both Booster packs DRV8711 in this configuration it is needed to use SPI communication (to set up the booster pack parameters) which has to be set for modul SPI_A and SPI_B. Modul SPI_B (headers J5 and J6) I am able to use without problems, but for the modul SPI_A (headers J1 and J2)I need to assign GPIO29 to control STE (slave select pin). And here is the problem:

I tested it in normal mode. It works. But in external mode, which I got used to to use, it does not work. And even when in model configuration parameters in GPIO29 nowhere else assigned.

What did I missed ?

Thank you very much for help

Michael