Use Startup files for Hardware interrupts #473

SympathicCone · 2022-05-04T10:25:37Z

I wish to use the hardware interrupts provided by the stm32h747xI within the portenta, so how and where do I add the startup_stm32h747.s where the IRQHandlers are defined to my code using ArduinoIDE? I am stuck within my project due to that since my code will just look forever for the said Handler and never get out of the interrupt . I looked it up online but no one uses Arduino IDE when it comes to implement .s files.

facchinm · 2022-05-04T10:48:38Z

Hi @SympathicCone ,
can you elaborate a bit more 🙂 ? The vector table is already defined in the core
https://github.com/arduino/mbed-os/blob/extrapatches-6.15.1/targets/TARGET_STM/TARGET_STM32H7/TARGET_STM32H747xI/TARGET_STM32H747xI_CM7/TOOLCHAIN_GCC_ARM/startup_stm32h747xx.S#L124-L293

To attach your function to an interrupt, after enabling it, you can implement the weak callback (remember the extern "C" clause if you are in a .ino or .cpp file) or hook you function with NVIC_SetVector.

Let's say, for example, you want to hook to LTDC_ER_IRQn ; you can do it this way

extern "C" {
void LTDC_ER_IRQHandler() {
  // do something here
}
}

or this way

NVIC_SetVector(LTDC_ER_IRQn, (uint32_t)&my_function);

facchinm closed this May 4, 2022

facchinm added question Portenta labels May 4, 2022

arduino / ArduinoCore-mbed Public

Use Startup files for Hardware interrupts #473

Use Startup files for Hardware interrupts #473

SympathicCone commented May 4, 2022

facchinm commented May 4, 2022

arduino / ArduinoCore-mbed Public

Use Startup files for Hardware interrupts #473

Use Startup files for Hardware interrupts #473

Comments

SympathicCone commented May 4, 2022

facchinm commented May 4, 2022