Pablo Andres Lencinas

why do not work my timer B??

Discussion created by Pablo Andres Lencinas on Apr 10, 2009
Latest reply on May 14, 2009 by Daniel Lundin

Hello I have programmed my  TIMA and I extract a pulses of approximately 1Hz

but with TIMB dont Work,I have used :1-a mr32

                                                    2-a mr16

                                                    3-other mr16

All are free samples, this is the program:

 

#include <hidef.h> /* for EnableInterrupts macro */
#include "derivative.h" /* include peripheral declarations */

int i=0;
int j=0;
void pllinit(void);
void init_pwm_timerb(void);
void input_ini(void);

void main(void) {

  EnableInterrupts; /* enable interrupts */
  /* include your code here */
pllinit();
init_pwm_timerb();
input_ini();
  for(;:smileywink: {
    __RESET_WATCHDOG(); /* feeds the dog */
  } /* loop forever */
  /* please make sure that you never leave main */
}
void pllinit(void){
 
 PBWC = 0x80;   /* set Auto Bandwidth Control */
  PCTL &= ~(0x20);  /* turn PLL off to be able to program multiplier */
  PPG=0x37;    /* multiply X-tal frequency by 3 => X-tal=9.83MHz *3 ~= 30MHz //para mi seria  0x37;
           bus frequency 32MHz/10 = 3MHz, VCO range = 7 *///32/9.83=3
  PCTL |= 0x20;   /* turn on the PLL */
 while (~PBWC & 0x40);   /* wait for PLL lock */ 
    PCTL |= 0x10;      /* use PLL clock */ 
}

void init_pwm_timerb(void){
  //timer que determina la frecuencia del var
  TBSC_TSTOP=1;/* Stop the TIMA counter by setting the TIMA stop bit, TSTOP.*/
  TBSC_TRST=1;/* Reset the TIMA counter and prescaler by setting the TIMA reset bit, TRST.*/
  TBMODH=0b11111111;
  TBMODL=0b11111110;/*In the TIMA counter modulo registers (TAMODH–TAMODL), write the value for the required PWM
  period.*/
  TBCH0H=0b00000000;/* In the TIMA channel x registers (TACHxH–TACHxL), write the value for the required pulse width.*/
  TBCH0L=0b11111111;
  TBSC_PS0=0;/*INTERNAL BUS CLOCK /64 */
  TBSC_PS1=1;//=1*64*65534/8000000=524mseg
  TBSC_PS2=1;
  TBSC0_MS0B=0;//unbuffered(0;1)/*Write 1:0 (for buffered output compare
//  or PWM signals) to the mode select bits, MSxB–MSxA.*/
  TBSC0_MS0A=1;
  TBSC0_TOV0=1;/* Write 1 to the toggle-on-overflow bit, TOVx.*/
  TBSC0_ELS0B=1;
  TBSC0_ELS0A=1;
  /*WRITE 1:1 (polarity 0 — to set output on
  compare) to the edge/level select bits, ELSxB–ELSxA. The output action on compare must
  force the output to the complement of the pulse width level.*/
  TBSC_TSTOP=0;/*In the TIMA status control register (TASC), clear the TIMA stop bit, TSTOP.*/
  TBSC_TOIE=1;/*habilito la interrupcion*/
}
 void input_ini(void){
DDRA=0b00000100;/*PTA2 SALIDA*/
}

 interrupt 16 void overflow_pwmb(void){
  #pragma TRAP_PROC SAVE_REGS
   TASC &= ~(0b10000000);/*PONGO EL FLAG NUEVAMENTE A CERO*/

if(i==0){
PTA_PTA2=1;
i=1;}
else {
PTA_PTA2=0;
i=0;}

return ;}

 

how you can see the program is very simple , I change A for B and the number 16 for 13 for the interrupt but don´t work(tihs make a sine wave of 66kHZ?? for 2 seconds)

The reason can be that the mr`s are samples??

please help mi

Thank you for your time

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