TMDSLCDK6748: Implementing GPIO interrupt into MCASP project

Ryan DiGrande

Part Number: TMDSLCDK6748

I am currently trying to implement GPIO push button interrupts into my MCASP project. The MCASP project I am working on is based off of the MCASP example project. It also already interacts with the push buttons, but not through the use of interrupts.

I managed to get the push buttons working as interrupts in the GPIO example project as a start, but when moving into the MCASP project I am unable to get them functioning.

I reviewed the GPIO documentation and the methods used in the GPIO example project and I believe I have it set up correctly in my MCASP project. This includes calling the setup functions and modifying the gpioPinConfigs and gpioCallbackFunctions in GPIO_board.c.

My question is: Is there anything that is specific to the MCASP example project that would restrict GPIO interrupts from working? Are there any modifications that I need to make to the .cfg file other than loading the GPIO package?

Thank you

over 4 years ago

0 Jianzhong Xu over 4 years ago

TI__Guru 60360 points

Hello Ryan,

The problems was most likely caused by GPIO and MCASP using the same interrupt event combiner. In mcasp_soc.c, there is:

            Mcasp_deviceInstInfo[i].txIntNum = OSAL_REGINT_INTVEC_EVENT_COMBINER;
            Mcasp_deviceInstInfo[i].rxIntNum = OSAL_REGINT_INTVEC_EVENT_COMBINER;

In GPIO_soc.c, there is:

GPIO_IntCfg GPIO_defaultIntCfg[GPIO_NUM_BANKS_PER_PORT] =
{
    /* GPIO port 0 bank 0 */
    {
#ifdef _TMS320C6X
        OSAL_REGINT_INTVEC_EVENT_COMBINER, /* default DSP Interrupt vector number, can be set in GPIO_socSetInitCfg() API */

Can you try a different event combiner for MCASP, for example:

            Mcasp_deviceInstInfo[i].txIntNum = 15;
            Mcasp_deviceInstInfo[i].rxIntNum = 15;

Regards,

Jianzhong

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TMDSLCDK6748: Implementing GPIO interrupt into MCASP project