Hi fanchang,
I checked the toolbox capabilities regarding this matter - and i'm sorry to inform you - but such functionality is not supported.
The Simulink Code Generations has 3 main functions where it can place the code: initialize, step and terminate. All that code that configures/initialize a peripheral is placed in the initialize function - that is executed only once at the application start.
In that function we can not have the same pin selected as INPUT and OUTPUT, therefore such scenario not supported.
To be honest i do not know how you could use it without some low level programming to control the state of that pin.
Perhaps you could try to use our standard DSPI block and use the SDPI_Transmit to configure the pins as normal SPI but in the HW to connect the same SIO to both SIN and SOUT from the MPC5744. Then with some logic to read the SOUT only when the S-35190A is transmitting.
This use-case looks like a loop back on SPI - so you will receive both the messages you transmit and the messages from the S-35190A. You discard the command message and you end up with the useful information for RTC. That might work.
You can check this video https://community.nxp.com/thread/453727 to see how you can program the standard SPI.
Hope this helps you!
Daniel
