timer/counter problem - please help

hi

i'm using atmega328 build engine controller final year project , i've run problem can solve.

i used 16bit timer1 counter encoder, , periodically fetched value tcnt1.

however, using timer1 counter prevents servo function working, need actuate engine trottle.


i've tried using timer0, seemed disable serial com, , can't figure out how use timer2 counter.

if can setting timer2 counter, or knows of method of using high speed encoder (up 5000 inputs per second) , servo motor together, i'd extremely grateful.

this timer 2 setup thats not working:

code: [select]


timsk2 = 0;            // disable timer2 interrupts
assr = 0b01000000;      // enable external clock source
// assr | 0b00100000;      // set asnychronous mode ???
// apparently timer must asnychronous use external source
tccr2a = 0;            // disable waveform generation mode
tccr2b = 0;       // use clock no prescaler
tcnt2 = 0;            // clear counter
tifr2=0;            // clear interrupt flag register
timsk2 = 1;            // enable overflow interrupts


i forgot mention serial communication computer vital project, why timer0 can't used.

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