I am stuck and do not know where to start.
Modify the sample code you were given to make it function just like the assembly code written previously.
The LED on B0 should flash continuously. Whenever you press the switch, the other 3 LEDs shoul d display the next number in the counting sequence 0 -> 7 and then wrap back around to 0.
-Sample code that needs to be modified C Blink and interrupt code
#include <avr/io.h>
#define F_CPU 1000000UL // 1 MHz
#include <util/delay.h>
#include <avr/interrupt.h>
ISR(PCINT2_vect) { /* Run every time there is a change on button */
if (PIND & (1 << PIND0)) {
PORTD |= (1<<PORTD1);
PORTD |= (1<<PORTD2);
PORTD |= (1<<PORTD3);
_delay_ms(250);
PORTD &= ~ (1<<PORTD1);
PORTD &= ~ (1<<PORTD2);
PORTD &= ~ (1<<PORTD3);
}
}
void initInterrupt0(void) {
PCICR |= (1 << PCIE2); /* set pin-change interrupt for D pins */
PCMSK2 |= (1 << PCINT16); /* set mask to look for PCINT18 / PD2 */
sei(); /* set (global) interrupt enable bit */
}
int main(void)
{
// -------- Inits --------- //
DDRB |= (1<<DDB0);
DDRD |= (1<<DDD1);
DDRD |= (1<<DDD2);
DDRD |= (1<<DDD3);
initInterrupt0();
/* Blink code */
while (1)
{
_delay_ms(200);
PORTB |= (1<<PORTB0);
_delay_ms(1000);
PORTB &= ~ (1<<PORTB0);
_delay_ms(1000);
}
}
code from assembly
.include "m328pdef.inc"
.def mask = r16 ; mask register
.def ledR = r17 ; led register
.def oLoopR = r18 ; outer loop register
.def iLoopRl = r24 ; inner loop register low
.def iLoopRh = r25 ; inner loop register high
.equ oVal = 71 ; outer loop value
.equ iVal = 2048 ; inner loop value
.org 0x0000
rjmp start
.org 0x000A
rjmp Interupt
;start of blinking
start:
sbi DDRD, 1
sbi DDRD, 2
sbi DDRD, 3
cbi DDRD, 0
; interupt requirments
sei
lds r16, PCMSK2
ori r16, (1<<PCINT16)
sts PCMSK2, r16
lds r16, PCICR
ori r16, (1<<PCIE2)
sts PCICR, r16
clr r20
clr ledR ; clear led register
ldi mask,(1<<PINB0) ; load 00000001 into mask register
out DDRB,mask ; set PINB0 to output
blink:
eor ledR,mask ; toggle PINB0 in led register
out PORTB,ledR ; write led register to PORTB
ldi oLoopR,oVal ; initialize outer loop count
oLoop: ldi iLoopRl,LOW(iVal) ; intialize inner loop count in inner
ldi iLoopRh,HIGH(iVal) ; loop high and low registers
iLoop: sbiw iLoopRl,1 ; decrement inner loop registers
brne iLoop ; branch to iLoop if iLoop registers != 0
dec oLoopR ; decrement outer loop register
brne oLoop ; branch to oLoop if outer loop register != 0
rjmp blink ; jump back to start
;interupt code
Interupt :
sbic PIND, 0
rjmp skip ; if interupt has just happened skip everything under this
inc r20
andi r20, 0b00000111
mov r19, r20
lsl r19
in r18, PIND
cbr r18, 0b00001110
or r18, r19
out PortD, r18
skip:
reti
General problems: