I want to use external interrupts on Pin P1.2 & p1.3 for frequancy measurement When Positive transition occours on pin External interrupt should be occour And in interrupt vector I want to increment one count time base is generated by timer 0 for ).1 seconds.
My probelm is even thouh frquancy of 1 Khz is applied to Pin P1.2 interrupt is not generate.
I want to know regisier detail configurations of resigistrs so that externl interrupt will generate
Thanks for your reply.
My hardware is perfect because if i measure the freqauncy by polling port pin for 0.1 sec using timer 1 it shows (for 1Khz it show 100 count = 0.1 sec time base.) Frequancy present at one i/p at time. so f_counter one variable is used for both. timer 1 is used for 0.1 sec time base code is not added here to make it small to read My code is something like this
P1_2 |=1; //frequancy i/p 1 (Rotor 1/INT 5/cc2) P1_3 |=1; //frequancy i/p 2 (Rotor 2 inpINT 6/cc3) T2CON |=0x11; //|=b00010001; f oscilator/12 CTCON |=b00000000//msb bits of T2CON & CTCON EX5=1; //enable ext int 5, P1_2 EX6=1; //enable ext int 6, P1_3 EN2 |= b00111100; //CCU int enable bits EAL=1; //enable global int CCEN =0x50; //cap on rising edge p1.3 & p1.2) //CMSEL =0xff;
for ( ; ; ) { _SRVWDT(); //watchdog
//*****scratch pad trial code****** SET_CURSOR (1,0); DISP_STRING ("= ",0); DISP_DEZ(f_counter,5,0); //Display freq dec. form }
//**************************************************** void EXT5_int (void) interrupt 12 //using 2 { f_counter=f_counter+1; } //**************************************************** void EXT6_int (void) interrupt 13 //using 2 { f_counter=f_counter+1; }
//****************************************************