[PIC] Doubt on timer1 operation

[Copper Masud]

a = (TMR1L | (TMR1H<<8));   //Reads Timer Value

what happened in the timer1 code (above) ???????

 

[horace1]

Re: timer1 ........................

TMR1L are TMR1H the low and high bytes of the timer1 16 bit value
the statement

a = (TMR1L | (TMR1H<<8));   //Reads Timer Value

1. reads TMR1L into bits 0 to 7 (low byte)
2. reads TMR1H and shifts it 8 bits left into bits 8 to 15 (high byte)
the two bytes are then bitwise ORed together to form a 16bit value which is assigned to a (which I assume is an int)

 

[Copper Masud]

Re: timer1 ........................

T1CON = 0x10;                 //Initialize Timer Module
a = (TMR1L | (TMR1H<<8));   //Reads Timer Value
    a = a/58.82;                //Converts Time to Distance
    a = a + 1;                  //Distance Calibration

do you think just converting a by 58.82 will give me the distance ???????????
ow they used 8MHz oscillator and PIC16f877A

 

[horace1]

Re: timer1 ........................

what is the algorithm?

also if you are dividing a by 58.82 make it a float variable