As for the other questions, the MCU is a an energy micro, and the SPI lines are connected as follows:
MOSI (labeled SPI_DI in logic analyzer capture): Direction: MCU->TiWi. Connected to TiWi-SL EM J4.10
MISO (labeled SPI_DO in logic analyzer capture): Direction: TiWi->MCU. Connected to TiWi-SL EM J5.9
PWR_EN (labeled PWR_EN in logic analyzer capture): Direction: MCU -> TiWi. Connected to TiWi-SL EM J4.8
\SPI_IRQ (labeled SPI_IRQ in logic analyzer capture): Direction: TiWi->MCU. Connected to TiWi-SL EM J5.8
\SPI_CS (Labeled SPI_CS in logic analyzer capture): Direction: MCU->TiWi. Connected to TiWi-SL EM J5.10
SPI_CLK (Labeled SPI_CLK in logic analyzer capture): Direction: MCU->TiWi. Connected to TiWi-SL EM J4.11