Mcc18 code. Interrupt happens, just unsure why it skips degCtr
occasionally. There are never 5 pulses. Only ever 3 or 4. Different pulses
will be missing. Unstable interval between failures. Cmp never fails to
miss a toggle however. It's a crankshaft/camshaft sensor simulator. Both
pwm modules are in use for a poor man's "DAC" but they use other timers.
Code has the same issue without USB code and with a different timer.


void HighPriorityISRCode()
{
//A3 silicon errata
_asm pop _endasm

if(PIR1bits.TMR1IF)
{
T1CONbits.TMR1ON=3D0;
WriteTimer1(degTmrCt);
PIR1bits.TMR1IF=3D0;
degCtr++;
degTDC++;
PIR1bits.TMR1IF=3D0;
switch(degCtr)
{
case(28):
case(48):
case(68):
case(88):
LATB &=3D CKP_ON;
break;
case(30):
case(50):
case(70):
case(90):
LATB |=3D CKP_OFF;
break;
case(120):
degCtr=3D0;
cmpCtr--;
if(cmpCtr=3D=3D0)
{
LATB ^=3D CMP_SIG;
cmpCtr=3D3;
}
break;
}
if(degTDC=3D=3D60)
degTDC=3D-60;
T1CONbits.TMR1ON=3D1;
}
}
--=20
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