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TMS570LS3137: Multiplexing of SPI4SOMI does not work in Port

Part Number: TMS570LS3137

In AUTOSAR_MCAL_TMS570LSx-05.30.00, multiplexing of SPI4SOMI does not work

PortPinSpi4_4 is configured with PORT_PIN_MODE_SPI and PIN_V6_31 is configured with PORT_PIN_MUX_ALT_1. After initialization is complete, I can see that both control register bits PINMMR5[17] and PINMMR23[24] are set. According to section 4.3.2 of the user manual, this combination selects the "dedicated pad" instead of the "multiplexed pin" as input. From research I come to the understanding that SPI4 signals are only available on multiplexed terminals for package option 144QFP. As a result, SPI4 does not receive any data on its SIMO line.

What is the correct PORT configuration for correct SPI4SOMI initialization?