I try to run a basic program LED_INTv2.c about interrupt.
Connection:
PB0 <---> LED <---> GND,
PD0(INT0) <---> Switch (on: connect)<---> GND
normal : LED on --- switch on --- PD0(INT0)=Low (GND) ---> LED off ---> Switch
off
----> PD0(INT0)=High ---> return to main routine ---> LED on
However, after switch on and off, program does not return to main routine, that
is, LED off ,
PD0(INT0) remains Low level.
In Sec 23.17 Table of the manual "avr-libc 2.0.0 Mon Feb 8 2016 23:59:10"
there is no ATmega32U4 in the list of devices for which INT0_vect is applicable.
Before I can perform a program of same content using ATtiny261.
ATtiny261 is in the list.
My Harware:
Teensy 2.0 (ATmega32U4)
My Software:
aruduino + Teensyduino.(Windows8.1)
What's problem ?
Is <avr/interrupt.h> applicable for Teensy2.0(ATmega32U4) ?
Can I use only Arduino library for interrupt using Teensy2.0 ?
I can perform a program of same content using Arduino library (LED_INTv4.c).
%%%%% LED_INTv2.c %%%%%%%%%%%%%%%
#include <avr/io.h>
#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
#define CPU_16MHz 0x00
#include <util/delay.h>
#include <avr/interrupt.h>
ISR(INT0_vect){
PORTB=0x00;
reti();
}
int main( void ){
CPU_PRESCALE(CPU_16MHz);
DDRB=0xff;
DDRD=0x0;
PORTB=0xff;
PORTD=0xff;
cli();
SREG=0b10000000;
EICRA=0b00000000; // Interrupt condition : Low Level
EIMSK=0b00000001; // Enable External Interrupt INT0
sei();
while(1);
}
%%%% LED_INTv4.c %%%%
void setup() {
pinMode(0,OUTPUT);
pinMode(5,INPUT_PULLUP);
attachInterrupt(digitalPinToInterrupt(5),turnoff,LOW);
}
void loop() {
digitalWrite(0,HIGH);
}
void turnoff() {
digitalWrite(0,LOW);
}
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