RTOS/TM4C1294NCPDT: SSI0 - is only DAT0 and DAT1 to be used for Tx and Rx in normal two wire mode?

Pavitra Ramanujam

Intellectual 740 points

Part Number: TM4C1294NCPDT

Tool/software: TI-RTOS

PA4 is the pin for SSI0DAT0 which for some reason I have used for UART3.. Can I sue then PA6 for Tx or Rx operation?

How is a pin specified to be Tx and Rx in the Tivaware. I only see these commands in SSI0 initialization:

GPIOPinConfigure(GPIO_PA4_SSI0XDAT0);

GPIOPinConfigure(GPIO_PA5_SSI0XDAT1);

GPIOPinConfigure(GPIO_PA6_SSI0XDAT2 );

How does Tiva know which is Transmit and which is Receive as all these are bi directional pins?

over 7 years ago

0 Bob Crosby over 7 years ago

TI__Guru 72500 points

In legacy mode (standard SPI mode) SSInXDAT0 is always TX, an output and SSInXDAT1 is always a RX, an input. In the Bi and Quad modes, the transmissions are half duplex, the pins are output on a TX operation and input on a RX operation. PA6 is only used as SSI0XDAT2 in Quad mode and cannot replace SSI0DAT0.

0 Pavitra Ramanujam over 7 years ago in reply to Bob Crosby

Intellectual 740 points

Thank you for your clear and crisp reply. This solved my problem.

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RTOS/TM4C1294NCPDT: SSI0 - is only DAT0 and DAT1 to be used for Tx and Rx in normal two wire mode?