[semi]

Zasilenie czujnika z osobnego zasilacza 5V powoduje ze lcd pokazuje juz totalne głupoty - predkosc nawet 6000 rpm

Bo pewnie mas nie połączyłeś.

Oto układ do pomiaru predkosci

Czego tam nie ma?
Komparator zupełnie niepotrzebny!

Pulsein nie ma prawa działać dobrze. Ani we wstawce ASM:

Kod:

#include <avr/io.h>

.section .text

.global countPulseASM

countPulseASM:

.LM0:
.LFBB1:
    push r12   ;   ;  130 pushqi1/1 [length = 1]
    push r13   ;   ;  131 pushqi1/1 [length = 1]
    push r14   ;   ;  132 pushqi1/1 [length = 1]
    push r15   ;   ;  133 pushqi1/1 [length = 1]
    push r16   ;   ;  134 pushqi1/1 [length = 1]
    push r17   ;   ;  135 pushqi1/1 [length = 1]
/* prologue: function */
/* frame size = 0 */
/* stack size = 6 */
.L__stack_usage = 6
    mov r30,r24  ;  port, port   ;  2 *movhi/1  [length = 2]
    mov r31,r25  ;  port, port
/*     unsigned long width = 0;
***     // wait for any previous pulse to end
***     while ((*port & bit) == stateMask)
*/
.LM1:
    rjmp .L2   ;   ;  181 jump  [length = 1]
.L4:
/*         if (--maxloops == 0) */
.LM2:
    subi r16,1   ;  maxloops,  ;  17  addsi3/2  [length = 4]
    sbc r17, r1   ;  maxloops
    sbc r18, r1   ;  maxloops
    sbc r19, r1   ;  maxloops
    breq .L13  ; ,   ;  19  branch  [length = 1]
.L2:
/*         if (--maxloops == 0) */
.LM3:
    ld r25,Z   ;  D.1554, *port_7(D)   ;  22  movqi_insn/4  [length = 1]
    and r25,r22  ;  D.1554, bit  ;  24  andqi3/1  [length = 1]
    cp r25,r20   ;  D.1554, stateMask  ;  25  *cmpqi/2  [length = 1]
    breq .L4   ; ,   ;  26  branch  [length = 1]
    rjmp .L6   ;   ;  184 jump  [length = 1]
.L7:
/*             return 0;
***
***     // wait for the pulse to start
***     while ((*port & bit) != stateMask)
***         if (--maxloops == 0)
*/
.LM4:
    subi r16,1   ;  maxloops,  ;  31  addsi3/2  [length = 4]
    sbc r17, r1   ;  maxloops
    sbc r18, r1   ;  maxloops
    sbc r19, r1   ;  maxloops
    breq .L13  ; ,   ;  33  branch  [length = 1]
.L6:
/*         if (--maxloops == 0) */
.LM5:
    ld r25,Z   ;  D.1554, *port_7(D)   ;  41  movqi_insn/4  [length = 1]
    and r25,r22  ;  D.1554, bit  ;  43  andqi3/1  [length = 1]
    cpse r25,r20   ;  D.1554, stateMask  ;  44  enable_interrupt-3  [length = 1]
    rjmp .L7   ;
    mov r12, r1   ;  width  ;  7 *movsi/2  [length = 4]
    mov r13, r1   ;  width
    mov r14, r1   ;  width
    mov r15, r1   ;  width
    rjmp .L9   ;   ;  186 jump  [length = 1]
.L10:
/*             return 0;
***
***     // wait for the pulse to stop
***     while ((*port & bit) == stateMask) {
***         if (++width == maxloops)
*/
.LM6:
    ldi r24,-1   ; ,   ;  50  addsi3/3  [length = 5]
    sub r12,r24  ;  width,
    sbc r13,r24  ;  width,
    sbc r14,r24  ;  width,
    sbc r15,r24  ;  width,
    cp r16,r12   ;  maxloops, width  ;  51  *cmpsi/2  [length = 4]
    cpc r17,r13  ;  maxloops, width
    cpc r18,r14  ;  maxloops, width
    cpc r19,r15  ;  maxloops, width
    breq .L13  ; ,   ;  52  branch  [length = 1]
.L9:
/*         if (++width == maxloops) */
.LM7:
    ld r24,Z   ;  D.1554, *port_7(D)   ;  60  movqi_insn/4  [length = 1]
    and r24,r22  ;  D.1554, bit  ;  62  andqi3/1  [length = 1]
    cp r24,r20   ;  D.1554, stateMask  ;  63  *cmpqi/2  [length = 1]
    breq .L10  ; ,   ;  64  branch  [length = 1]
/*             return 0;
***     }
***     return width;
*/
.LM8:
    mov r22,r12  ;  D.1553, width  ;  108 movqi_insn/1  [length = 1]
    mov r23,r13  ;  D.1553, width  ;  109 movqi_insn/1  [length = 1]
    mov r24,r14  ;  D.1553, width  ;  110 movqi_insn/1  [length = 1]
    mov r25,r15  ;  D.1553, width  ;  111 movqi_insn/1  [length = 1]
/* epilogue start */
.LM9:
    pop r17  ;   ;  171 popqi [length = 1]
    pop r16  ;   ;  172 popqi [length = 1]
    pop r15  ;   ;  173 popqi [length = 1]
    pop r14  ;   ;  174 popqi [length = 1]
    pop r13  ;   ;  175 popqi [length = 1]
    pop r12  ;   ;  176 popqi [length = 1]
    ret  ;  177 return_from_epilogue  [length = 1]
.L13:
.LM10:
    ldi r22,0  ;  D.1553   ;  120 movqi_insn/1  [length = 1]
    ldi r23,0  ;  D.1553   ;  121 movqi_insn/1  [length = 1]
    ldi r24,0  ;  D.1553   ;  122 movqi_insn/1  [length = 1]
    ldi r25,0  ;  D.1553   ;  123 movqi_insn/1  [length = 1]
/* epilogue start */
.LM11:
    pop r17  ;   ;  138 popqi [length = 1]
    pop r16  ;   ;  139 popqi [length = 1]
    pop r15  ;   ;  140 popqi [length = 1]
    pop r14  ;   ;  141 popqi [length = 1]
    pop r13  ;   ;  142 popqi [length = 1]
    pop r12  ;   ;  143 popqi [length = 1]
    ret  ;  144 return_from_epilogue  [length = 1]

ani w jej wywołaniu:

Kod:

unsigned long pulseIn(uint8_t pin, uint8_t state, unsigned long timeout)
{
    // cache the port and bit of the pin in order to speed up the
    // pulse width measuring loop and achieve finer resolution.  calling
    // digitalRead() instead yields much coarser resolution.
    uint8_t bit = digitalPinToBitMask(pin);
    uint8_t port = digitalPinToPort(pin);
    uint8_t stateMask = (state ? bit : 0);

    // convert the timeout from microseconds to a number of times through
    // the initial loop; it takes approximately 16 clock cycles per iteration
    unsigned long maxloops = microsecondsToClockCycles(timeout)/16;

    unsigned long width = countPulseASM(portInputRegister(port), bit, stateMask, maxloops);

    // prevent clockCyclesToMicroseconds to return bogus values if countPulseASM timed out
    if (width)
        return clockCyclesToMicroseconds(width * 16 + 16);
    else
        return 0;
}

Nie są blokowane przerwania a funkcja opiera się o programowy pomiar czasu.
Zrób pomiar czasu timerem, korzystając z przechwytywania (ICP).