I posted some timer3 code that may-or-may-not help,
I think under www.etantdonnes.com/Motes
but my server seems to be down right now...
I'll attach the relevant file here.
MS
roberto pagliari wrote:
I'm having troubles using timer. I wrote something like this
command result_t StdControl.init() {
call Leds.init();
return SUCCESS;
}
command result_t StdControl.start() {
outp(0x00, TCCR3A); // no waveform or output toggle
outp(0x20, TCCR3B); // clk / 8 --> 1 tick = 1usec
outp(0x00, TCNT3); // initial value
outp(0xC3, OCR3AH); // 0xC350 = 50000 ticks = 50ms
outp(0x50, OCR3AL);
sbi(ETIMSK,OCIE3A); // enable output compare timer
return SUCCESS;
}
command result_t StdControl.stop() {
return SUCCESS;
}
TOSH_INTERRUPT(SIG_OUTPUT_COMPARE3A) {
call Leds.redOn();
// some code
}
but I can't see the timer switching on the red led. where is the problem
?
thanbks
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/* HPLT3captureM.nc -- Code to use Timer3 to time pulses on port PE7.
* Defaults to values for 16 bit resolution of 1.088us per bit.
*
* Authors: M.Schippling
*/
module HPLT3captureM
{
provides interface HPLT3capture;
}
implementation
{
uint8_t t3bmask = 0; // added bits to mask with TCCR3B prescale set
// assign input pin name
TOSH_ASSIGN_PIN(TRIGGER, E, 7); // port,pin E7
/** init()
* Setup the Timer3 for normal up count, mode 0.
* Initialize interrupt time capture on PE7/INT3 (or in real AVR INT7).
* Use capture edge specified by edge argument, where TRUE=rising.
* default settings: /8 internal clock pre-scale
* ICR3 as capture count trigger
* OCR3 not used
* resolution is 1.088us
* max count is approx 71ms
**/
command result_t HPLT3capture.init( bool edge )
{
// Set input pin direction and turn on internal pullup
TOSH_MAKE_TRIGGER_INPUT();
TOSH_SET_TRIGGER_PIN();
// configure count interrupt edge
if( edge == TRUE )
t3bmask = (1 << ICES3);
// turn off OCR3 output, set WGM3 to mode 0, and noise canceler off
outp( 0, TCCR3A ); // clear OCR3 outputs and lowWGM bits
outp( t3bmask, TCCR3B ); // set edge, clock-select, and highWGM bits
// Set prescaler to CK/8
call HPLT3capture.setPreScale( 0x02 );
// setup interrupts
cbi(ETIMSK, TOIE3); // clear overflow int so TOV3 isn't
reset
call HPLT3capture.intEnable(); // set capture int
return SUCCESS;
}
/** setPreScale()
* Set the clock pre-scale and clock source value
* @param ps: TCCR3B register set value.
* 0 -- 000 No clock source. (Timer/Counter stopped)
* 1 -- 001 clkI/O/1 136ns clock (clock no-prescaling)
* 2 -- 010 clkI/O/8 1.088us
* 3 -- 011 clkI/O/64 8.704us
* 4 -- 100 clkI/O/256 34.816ms
* 5 -- 101 clkI/O/1024 139.264ms
* 6 -- 110 External clock source on Tn pin. Clock on falling edge
* 7 -- 111 External clock source on Tn pin. Clock on rising edge
* @return nada.
**/
command void HPLT3capture.setPreScale( uint8_t ps )
{
// OR with edge select bit, as per init(), and save for later
t3bmask &= ~0x07;
t3bmask |= (ps & 0x07);
outp( t3bmask, TCCR3B );
return;
}
/** invertEdge()
* Invert the edge detect sense, if it was 1 it's 0 after, USW
**/
command void HPLT3capture.invertEdge()
{
// diddle edge select bit and write reg bit
t3bmask ^= (1 << ICES3);
if( t3bmask & (1 << ICES3) )
sbi( TCCR3B, ICES3 );
else
cbi( TCCR3B, ICES3 );
return;
}
/** enable and disable interrupts **/
async command void HPLT3capture.intDisable()
{ cbi(ETIMSK, TICIE3); }
async command void HPLT3capture.intEnable()
{ sbi(ETIMSK, TICIE3); }
/** fire()
* Event sent when the input interrupt goes off.
* Gets the count value and a counter overflow indicator.
* If over==TRUE counter wrapped between last call and this.
**/
default async event result_t HPLT3capture.fire( uint16_t count, bool over )
{ return SUCCESS; }
/** install the interrupt code.
** note: vectors are defined in /usr/local/avr/include/avr/iom128.h
**/
TOSH_INTERRUPT(SIG_INPUT_CAPTURE3)
{
bool over;
// read count registers
uint16_t count = inp( ICR3L );
count |= (inp( ICR3H ) << 8);
// clear int
sbi( ETIFR, ICF3 );
// get overflow situation on TOV3
over = (inp( ETIFR ) & (1 << TOV3) ) ? TRUE : FALSE ;
// clear overflow and counters
sbi( ETIFR, TOV3 );
outp( 0, TCNT3H );
outp( 0, TCNT3L );
// call user
signal HPLT3capture.fire( count, over );
}
} // end'o'impl
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