Hardware interrupt example

[umair]

Hello! I am newbie, I am using nordic nrf51822a board. Can anyone give me hardware interrupt example code and tell me how to enable it?

[Håkon Alseth]

Hi,

Interrupts are essentially enabled by using two steps:

• Enable the interrupt vector using NVIC_EnableIRQ(IRQ_type)
• Set the appropriate bit in NRF_wantedperipheral->INTENSET = MASK_ENABLE;

I'm attaching a small example on how to setup the ADC w/ISR.

Best regards Håkon

adc_isr_example.zip

[Bastiaan]

Thank you Sir! can you also tell me where can I find the IRQ hander function?

[Guest]

Thank you Sir! can you also tell me where can I find the IRQ hander function?

[Håkon Alseth]

Hi,

The interrupt handler is located in the file startup_nrf51.s under the comment "; External Interrupts". These should be declared in your source file (let's say main.c) in this fashion: "void PERIPHERALX_IRQHandler(void){ .. }"

When enabling the IRQ, using NVIC-functions, they take in the type "IRQn_Type". This is declared in nrf51.h, line 82.

[Ole Morten]

To clean things up, I'd be happy if you could evaluate the answer you have received and accept it if you feel it's sufficient. If not, it might be useful to expand your question a little and provide further information.