[AVR] priority for multiple interrups in AVR

[ketanrathod]

I am using ISR(INT0_vect) & ISR(USART_RXC_vect) interrupts. Both are in separate application codes. When I synchronizes these both codes, code doesn't works. Please suggest me what should I do ?

 

[ud23]

First of all do read the datasheet thoroughly which AVR controller you are using.

http://www.avr-tutorials.com/interrupts/about-avr-8-bit-microcontrollers-interrupts

above link might help you

 

[ketanrathod]

I need more help sir. Please explain how to use one ISR interrupt on the occurrence of new other ISR interrupt ?

 

[milan.rajik]

Interrupt Priority is not causing any problem in your project. You say that INT0 fires and it displays messages on LCD based on values of data[0]. So ISR is working properly. wrong .hex file is being generated or there is an issue with the RAM usage. I have experienced the same problem with Arduino Code with UNO R3. The ISR was firing for small code and if some more code was added then Serial ISR was not at all firing.

 

[FvM]

Useful steps to get help:
- Tell briefly what you want to achieve. Up to now, you just told that your application involves two interrupts, which is rather common.
- Tell which problem you observe. "Code doesn't work" means nothing.
- Show your code.