I'm not too familiar with working with interrupt-driven timers so here's a question for those of you more experienced programmers... I'm simply detailing the steps i took to set up a timer, so someone please correct me if i took a wrong turn.
OK I was thinking about using an interrupt-driven timer (Timer1 - as indicated in the PIC datasheet - to be more specific) used to keep track of time intervals during the Autonomous period.
The first thing I did was initialize it under
User_Initialization (user_routines.c) with the following configurations:
T1CONbits.T1CKPS0 = 1; // 1:8 Prescale (clock=1.25MHz/each tick=800ns)
T1CONbits.T1CKPS1 = 1;
T1CONbits.TMR1CS = 0; // = 0 Timer uses internal clock
TMR1H = 0x85; // Sets most significant byte
TMRIL = 0xED; // Sets least significant byte
T1CONbits.TMR1ON = 1; // Turns on Timer1
IPR1bits.TMR1IP = 0; // Sets Timer1 as low priority
PIE1bits.TMR1IE = 1; // Enables Timer1 overflow interrupt
INTCONbits.GIEL = 1; // Enables low priority interruptions
Inside the InterruptHandlerLow () function i've got the following IF loop set up:
if (PIR1bits.TMR1IF) // In other words, has Timer1 overflowed?
{
PIR1bits.TMRI1F = 0; // Resets Timer1
timer1_flag = 1; // Variable used as a flag
}
All righty, the one thing i need to know is where exactly should i call the InterruptHandlerLow () function from? Inside the
while (autonomous_mode) loop in user_routines_fast?? That way I was thinking of calling my team's customized autonomous function (known as Autonomous() in this case) from inside the
while (autonomous_mode), transferring the value of timer1_flag through parameters, and using that value afterwards inside my Autonomous() function...
Example:
while (autonomous_mode) /* DO NOT CHANGE! */
{
if (statusflag.NEW_SPI_DATA) /* 26.2ms loop area */
{
Getdata(&rxdata);
Autonomous((int)timer1_flag);
Generate_Pwms(pwm13,pwm14,pwm15,pwm16);
Putdata(&txdata);
}
}
OK would this by any chance work at all, or have i totally lost it
lol ? Any help at all would be greatly appreciated!!!