period of 100 us

[aymen]

I want to fix a period of 100us (T=100us),which i use in my calculation.I have a problem to find it.
i look for your help.

[Mark]

We have a problem understanding what you want to do! Are you wanting a timer to give an int every 100us? That is pretty fast if your pic is running slow. What pic and freq do you have?

[aymen]

pic is 18f442 with freq of 40MHZ.
i want to introduce a value of 100 us .
this solution is possible?

float T
#int_timer1 noclear
clock_isr(){
T=get_timer1();
}
main()
{
for(;;)
{
enable_interrupts(global);
enable_interrupts(INT_TIMER1);

set_timer1(65411); // 65536-65411=125 coresspond for T= 100 us /// (100/0.8)=125
setup_timer_1(T1_internal| T1_div_by_8); // th timer overflow every 0.8 us
}}

[Mark]

I am using a 18F6720 @ 40MHz to sample a DALI bus every 104us. So the answer is yes. I use a CCP interrupt however. I set the CCP to reset the timer so that I do not have problems with latency "adding up".


Note that you have noclear flag and are not clearing the int. Not a good thing. Also, get_timer1 should return a 16 bit int and not a float.