C 闪烁和中断项目

Question

我被卡住了，不知道从哪里开始。

修改给你的示例代码，使其功能与之前编写的汇编代码一样。

B0 上的 LED 应连续闪烁。每当您按下开关时，其他 3 个 LED 应显示计数序列中的下一个数字 0 -> 7，然后返回到 0。

-需要修改的示例代码C闪烁和中断代码

#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);
    }
}

汇编代码

.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
    

Answer 1

一般问题：

• 所有开关都必须去抖动。如果不是在带有 RC 滤波器的硬件中完成，则必须在软件中完成。
• 由于上述原因，在连接到开关的 GPIO 输入上启用中断是一个重大错误。如果您知道自己在做什么，可以这样做，但这可能不是初学者的任务。见https://stackoverflow.com/a/23559522/584518。
• ISR 中不能有 250 毫秒的忙延迟，这完全没有意义。在这种情况下，它会扰乱 LED 的闪烁频率并阻止按钮触发。