assembly - Atmega8535 INT0 INT1 INT2 INT3 -


i using atmega8535 microcontoller , stk200 development board, trying use more 1 external interrupt, reason int0 works , others nothing, here related code:

;interrupt vector addresses  .equ     int0addr=$001            ;external interrupt0 vector address  .equ     int1addr=$002 .equ     int2addr=$003 .equ     int3addr=$004 .equ     int4addr=$005  //interrupts .org     int0addr           rjmp   int0              ;external interrupt0 vector  .org     $0015                    ;program address   .org     int1addr           rjmp   int1              ;external interrupt1 vector  .org     $0015                    ;program address  .org     int2addr           rjmp   int2              ;external interrupt0 vector  .org     $0017  .org     int3addr           rjmp   int3              ;external interrupt0 vector  .org     $0018  .org     int4addr           rjmp   int4              ;external interrupt0 vector  .org     $0019 ;external interrupt0 service routine  int0:    cli                      ;prevent more interrupts while isr running       rjmp reset       reti                     ;return , enable interrupts again  ;external interrupt1 service routine  int1:    cli                      ;prevent more interrupts while isr running           rjmp reset           reti                     ;return , enable interrupts again ;external interrupt1 service routine  int2:    cli                      ;prevent more interrupts while isr running           rjmp reset           reti                     ;return , enable interrupts again ;external interrupt1 service routine  int3:    cli                      ;prevent more interrupts while isr running           rjmp reset           reti                     ;return , enable interrupts again ;external interrupt1 service routine  int4:    cli                      ;prevent more interrupts while isr running           rjmp reset           reti                     ;return , enable interrupts again

you might asking bit processor. according processor reference (pg. 65) processor has 3 external interrupts int0, int1 , int2 (on portd.2, portd.3 , portb.2 respectively) ... worth reading pg 68ff!

i don't see set global interrupt enable bit (bit 7 of sreg) after reset 0 , preventing interrupts being processed, , individual interrupts must enabled (register gicr)

you have lot of superfluous .org in code (e.g. lines 11, 13).

i recommend include device specific inc file, , - sake of clarity - specify full interrupt vector table e.g.

.nolist .include <m8535def.inc> .list  .org 0x0000                      ; .... highest priority     jmp v_reset      ; reset     jmp v_extint0    ; external interrupt 0     jmp v_extint1    ; external interrupt 1     jmp v_noint      ; timer/counter2 compare match     jmp v_noint      ; timer/counter2 overflow     jmp v_noint      ; timer/counter1 capture event     jmp v_noint      ; timer/counter1 compare match     jmp v_noint      ; timer/counter1 compare match b     jmp v_noint      ; timer/counter1 overflow     jmp v_noint      ; timer/counter0 overflow     jmp v_noint      ; spi serial transfer complete     jmp v_noint      ; usart, rx complete     jmp v_noint      ; usart data register empty     jmp v_noint      ; usart, tx complete     jmp v_noint      ; adc conversion complete     jmp v_noint      ; eeprom ready     jmp v_noint      ; analog comparator     jmp v_noint      ; two-wire serial interface     jmp v_extint2    ; external interrupt request 2     jmp v_noint      ; timercounter0 compare match     jmp v_noint      ; store program memory read                      ; .... lowest priority  v_reset:     ; define stack pointer     ; set individual interrupt bits     ; initialize ports, etc.      sei              ; enable general interrupts  main:     rjmp main  v_extint0:     ; int0 handler     reti  v_extint1:     ; int1 handler     reti  v_extint2:     ; int2 handler     reti  v_noint:     ; e.g. flash led otherwise unused show abnormal condition     reti

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