DT Instant Interrupts help

[Ioannis]

Hi. I would recommend for the sake of experimantation to increase the sampling of the count command to say 2000msec and see what happens.

The timer1 interrupts the count every 105 msec and is obvious that there is interference since the Count also samples at 100 msec. Remember that the Interrupts are not Instant with the exact meaning. There is an overhead to save and restore the variables and program counter.

Also at your program:

:main

make it as

main:

and

    while 1=1
     COUNT rpmIn, 100, rpm 
     LCDOUT $FE,1, "PULS/S ", DEC(RPM)
     LCDOUT $FE, $C0, "RPM ", DEC(rpm)*60
    wend

make it as:

rpm var word
LCDOUT $FE,1, "PULS/S ", $FE,$C0,"RPM:"
    while 1=1
     COUNT rpmIn, 2000, rpm:rpm=rpm*60 
     LCDOUT $FE, $80,dec,"  ", rpm,$FE,$C5, DEC rpm,"   "
    wend

this is much faster.

Ioannis