TMS570LS3137-EP: Using SPI as a GIO for external WatchDog

AARON SPILKER

Part Number: TMS570LS3137-EP
Other Parts Discussed in Thread: HALCOGEN

I am trying to use the SPI2NCS[0] pin as a GIO to pet an external WatchDog (toggle every 1.6s else reset).

In my HALCOGEN I have enabled the SPI2 driver and for the SPI2 Port SCS[0] i have set the pin mode to GIO.

    /** - SPI2 Port output values */
    spiREG2->PC3 =    (uint32_t)((uint32_t)1U << 0U) /* SCS[0] */
                      | (uint32_t)((uint32_t)0U << 1U) /* SCS[1] */
                                      | (uint32_t)((uint32_t)0U << 8U) /* ENA */
                                      | (uint32_t)((uint32_t)0U << 9U) /* CLK */
                      | (uint32_t)((uint32_t)0U << 10U) /* SIMO */
                                      | (uint32_t)((uint32_t)0U << 11U); /* SOMI */

I do not need to use the HALCOGEN functions to send the data because the code is interrupt context.

From the datasheet it is not clear to me how to use it as a GIO and simply toggle the ping.

over 5 years ago

0 Charles Tsai over 5 years ago

TI__Guru**** 191906 points

Hi Aaron,

I suppose in HalcoGen you have already configured the SPI2 SCS[0] as a GIO. If you did, you would have seen the below generated code for the PC0 register configuration. Writing a '0' to the PC0 at bit0 will make SCS[0] a GIO pin.