How many interrupt vectors does the Arduino Uno have?
PCINT0 ~ 2 are the pin interrupt change vectors. The Arduino Uno has a total of 26 interrupt vectors, and most of these are internal interrupts that are triggered by internal peripherals such as the ADC, timers or UARTs etc.
Why does PCInt say redefinition of’void’?
The error message simply means that you have defined that function twice. One definition is explicit in the code you are showing to us. I cannot see the other definition: obviously you are not showing all of your code. Most likely that other definition lies inside some library you are using in your program.
How to know if pcint4 is an interrupt vector?
In the ATTiny chips, since there are so few Pin Change Interrupt pins (8 or less) you only need one Pin Change Interrupt vector to handle them. You can know if “PCINT4” corresponds to a pin or a vector by the context.
Why is there an error in pcint1 _ Vect ( )?
__vector_4 () is just another name for PCINT1_vect (). The error message simply means that you have defined that function twice. One definition is explicit in the code you are showing to us. I cannot see the other definition: obviously you are not showing all of your code.
How to create internal interrupt in Arduino IDE?
Before starting write the program you need to make sure that, you have arduino Timerone library in your arduino IDE.IF not then you can download from here or from arduino page Link: http://playground.arduino.cc/Code/Timer1. Normally, internal interrupt are created by timer resister.Arduino has three timer.
What are the interrupt ports on an Arduino Uno?
Arduino UNO have two interrupt ports and Arduino Mega2560 have six interrupt ports named as INT1,INT0. On the software side create sleep mode for Arduino and use a timer base interrupts which would internally be essentially triggering awakening function and not relay on any external hardware.
Which is the address of the interrupt vector?
The sequence ‘ count.inc retrieves the address cfa of the word count.inc . In the example above, the sequence INTO int! affects the cfa from the word count.inc to the interrupt vector corresponding to INT0 (value 2).