XMC4800 Pin Interrupts

[Steffen_S]

Good Morning, 

I can't get an Interrupt to work with the XMC Controller, please help me getting my head around:

The rising edge of Pin 0.9 is supposed to trigger the interrupt, please tell me where i am mistaking:

//Setting p0.9 as Input
XMC_GPIO_SetMode(XMC_GPIO_PORT0, 9,XMC_GPIO_MODE_INPUT_PULL_DOWN);

//ERU Config
XMC_ERU_ETL_CONFIG_t eruInit;
eruInit.input_b = ERU0_ETL1_INPUTB_P0_9;
eruInit.edge_detection = XMC_ERU_ETL_EDGE_DETECTION_RISING;
eruInit.enable_output_trigger = true;
eruInit.output_trigger_channel = XMC_ERU_ETL_OUTPUT_TRIGGER_CHANNEL0;



//OGU Config
XMC_ERU_OGU_CONFIG_t oguInit;
oguInit.service_request = XMC_ERU_OGU_SERVICE_REQUEST_ON_TRIGGER;

//ERU and OGU Init:
XMC_ERU_ETL_Init(ERU0_ETL1, &eruInit);
XMC_ERU_OGU_Init(ERU0_OGU0, &oguInit);

//enable Interrupt
NVIC_SetPriority(ERU0_0_IRQn,3);
NVIC_EnableIRQ(ERU0_0_IRQn);



and then my IRQ Handler:

void ERU0_0_IRQHandler(void)
{

    //set breakpoint and be happy when the code arrives here

}

Do i use the right ERU, ETL, OGU? Is everything configured propperly? I read something that i have to call a Method "ClearEventStatus" in xmc4800, but i dont know what could be  a valid argument.

Thank you in advance.

Steffen

[Aashita_R · Accepted solution]

Hi @Steffen_S ,

Could you please try including the below two parameters in addition to the ones you mentioned for configuring ERU?

eruInit.source = XMC_ERU_ETL_SOURCE_B ;
eruInit.status_flag_mode = XMC_ERU_ETL_STATUS_FLAG_MODE_HWCTRL,

You can read about these two parameters in the XMC library implementation by following these steps -> open DAVE-> Help -> XMC library implementation->  XMC 4.x.x-> Modules -> ERU -> XMC_ERU_ETL_CONFIG_t.

For the source, it is clear from your code that you desire to use input B. And for status_flag_mode, please find the details in the section 4.5(Event Request Unit) of XMC 4700 reference manual here. I am sharing the image from the reference manual below. It explains the correct choice for this parameter according to your application.

You can use the API XMC_ERU_ETL_ClearStatusFlag() to clear the Flag so that the next event is considered as new event. Hope this helps.

Please let us know in case of any further query.

Best Regards,

Aashita