LP-AM243: PRU to R5 interrupt signalling

replying to myself, I believe PRUICSS_registerIrqHandler(gPruIcss0Handle, 2, 120, 3, 0, &pru0_adc_buffer_filled_irq); is incorrect as I've been trying various values after the expected ones didn't work.

Hi,

One issue that I can see is - the interrupt channel-host mapping in PRUICSS_intcInit should be done before registering an Interrupt Handler for the event through PRUICSS_registerIrqHandler.

You can refer to the sample project attached in this thread: https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers-forum/am2634-fail-to-generate-an-interrupt-from-pru-to-r5f

As mentioned in the thread, the attached project is based on an older SDK 8.5, please use the code only as a reference for configuring the interrupt, 

Do let me know if you have any more questions.

Regards,

Nitika

Hi Nitika Verma,

Thanks for your input,

As I can't import the project I copied the code where possible to my own project but the interrupt does not fire, are these lines significant as I don't have the header files required included in my project?

Pinmux_config(gPinMuxMainDomainCfg_1, PINMUX_DOMAIN_ID_MAIN);
HW_WR_REG32(CSL_MSS_CTRL_U_BASE + CSL_MSS_CTRL_ICSSM_PRU0_GPIO_OUT_CTRL, MSS_CTRL_ICSSM_PRU_GPIO_OUT_CTRL_VALUE);
HW_WR_REG32(CSL_MSS_CTRL_U_BASE + CSL_MSS_CTRL_ICSSM_PRU1_GPIO_OUT_CTRL, MSS_CTRL_ICSSM_PRU_GPIO_OUT_CTRL_VALUE);
SOC_selectIcssGpiMux(0, 0x0);

Sysconfig has been changed so it produces icss0_intc_initdata the same as the example

PRUICSS_IntcInitData icss0_intc_initdata =
{
    {
        ICSS_INTC_EVENT_16,
        0xFF
    },
    {
        {
            ICSS_INTC_EVENT_16,
            ICSS_INTC_CHANNEL_2,
            SYS_EVT_POLARITY_HIGH,
            SYS_EVT_TYPE_PULSE,
        },
        {0xFF, 0xFF, 0xFF, 0xFF}
    },
    {
        {
            ICSS_INTC_CHANNEL_2,
            ICSS_INTC_HOST_INTR_2
        },
        {0xFF, 0xFF}
    },
    (
        ICSS_INTC_HOST_INTR_2_HOSTEN_MASK
    )
};

     int status;

     gPruIcss0Handle = PRUICSS_open(CONFIG_PRU_ICSS0);
     DebugP_assert(gPruIcss0Handle != NULL);
     status = PRUICSS_intcInit(gPruIcss0Handle, &icss0_intc_initdata);
     DebugP_assert(SystemP_SUCCESS == status);

     status = PRUICSS_initMemory(gPruIcss0Handle, PRUICSS_DATARAM(PRUICSS_PRUx));
     DebugP_assert(status != 0);
     status = PRUICSS_resetCore(gPruIcss0Handle, PRUICSS_PRUx);
     DebugP_assert(SystemP_SUCCESS == status);
     status = PRUICSS_disableCore(gPruIcss0Handle, PRUICSS_PRUx);
     DebugP_assert(SystemP_SUCCESS == status);

     /* Load firmware. Set buffer = write to Pru memory */
     status = PRUICSS_writeMemory(gPruIcss0Handle, PRUICSS_IRAM_PRU(PRUICSS_PRUx), 0,
                        (uint32_t *) PRUFirmware_0, sizeof(PRUFirmware_0));
     DebugP_assert(status != 0);

     status = PRUICSS_resetCore(gPruIcss0Handle, PRUICSS_PRUx);
     DebugP_assert(SystemP_SUCCESS == status);
     status = PRUICSS_enableCore(gPruIcss0Handle, PRUICSS_PRUx);
     DebugP_assert(SystemP_SUCCESS == status);

     int32_t                  pruEvtoutNum = 0 ; /*PRU_ICSSG0_PR1_HOST_INTR_PEND_0*/
     int32_t                  r5fIntrNum = 0;

     status = PRUICSS_registerIrqHandler(gPruIcss0Handle,
                                    pruEvtoutNum,  /*  pruEvtoutNum PRU_ICSSG0_PR1_HOST_INTR_PEND_0 = 0, .... PRU_ICSSG0_PR1_HOST_INTR_PEND_7 = 7 */
                                    r5fIntrNum,    /*  r5fIntrNum   corresponding r5f input interrupt line */
                                    1,            /*  eventNum(Do not care)*/
                                    0,            /*  wait_enable  */
                                    PRU_R5f_Intrhandler);
     if (status == SystemP_SUCCESS)
     {
         DebugP_log("Registered PRU Interrupt Handler");
     }
     else
     {
         DebugP_log("PRU Interrupt Handler Registration failed");
     }

     DebugP_assert(SystemP_SUCCESS == status);

void PRU_R5f_Intrhandler(void *args)
{
    int32_t intc_event_num = 16;
    irq_count++;
    PRUICSS_clearEvent(gPruIcss0Handle, intc_event_num); /*INTC Event number(16 to 32)*/
}