Problem Serial.print change my timing

Projects Programming
18

(the code needed to store tension[i] is actually relatively substantial:

    tension[i] = word(tension_high, tension_low);
 8d6:   e0 91 2b 03     lds     r30, 0x032B     ; 0x80032b <i>
 8da:   f0 e0           ldi     r31, 0x00       ; 0
 8dc:   ee 0f           add     r30, r30
 8de:   ff 1f           adc     r31, r31
 8e0:   eb 5c           subi    r30, 0xCB       ; 203
 8e2:   fe 4f           sbci    r31, 0xFE       ; 254
 8e4:   80 91 29 03     lds     r24, 0x0329     ; 0x800329 <tension_high>
 8e8:   90 91 2a 03     lds     r25, 0x032A     ; 0x80032a <tension_low>
 8ec:   89 27           eor     r24, r25
 8ee:   98 27           eor     r25, r24
 8f0:   89 27           eor     r24, r25
 8f2:   91 83           std     Z+1, r25        ; 0x01
 8f4:   80 83           st      Z, r24

word() does not seem to be very optimal, nor does it get very optimized :frowning:

It looks like things will improve substantially if you make some of the variables local to loop:

void loop() {
  byte i = 0;
  byte courant_low;
  byte courant_high;
  byte tension_low;
  byte tension_high;

The loop code goes from ~84 bytes to 30 bytes!