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Emre Ertonga

Other Parts Discussed in Thread: HALCOGEN, RM48L950

Tool/software: Code Composer Studio

Hi ,

I'm using RM48L950. I want to change pwm duty cycle with interrupt ( 100 us ) . I'm doing that but i have a signal problem in ossiloscope.I did every setting in HALCoGen. Below are the codes and the error i got. There are interruptions in the signal.What is the reason of this and how can I fix this problem? I will be grateful if you could help me and I would be very happy if you can come back quickly.

Have a good day.

-CODES-

#include "sys_common.h"

#include "rti.h"
#include "het.h"
#include "gio.h"
int i;

void main(void)
{

sciInit();
hetInit();
rtiInit();

gioSetDirection(hetPORT1, 0xFFFFFFFF);
pwmStart(hetRAM1, pwm0);

rtiEnableNotification(rtiNOTIFICATION_COMPARE0);

_enable_IRQ();

rtiStartCounter(rtiCOUNTER_BLOCK0);

while(1);

}

void rtiNotification(uint32 notification)
{

if (i < 101)
{
i++;
}
else
{
i=0;
}
pwmSetDuty(hetRAM1, pwm0,i);

}

over 5 years ago

0 QJ Wang over 5 years ago

TI__Guru**** 199216 points

Hello,

This is a known bug in the NHET PWM code included with HalCoGen.

The workaround is to don't change the duty cycle from 100% to 0% directly, and use an intermediate value first then 0%.

0 Emre Ertonga over 5 years ago in reply to QJ Wang

Prodigy 250 points

Thank you for your answer. I tried to change duty rate %70 to %50 (It is in below). it is working but i must to change between %0-%100 . How can i do this.What do i need to change and how? I guess i must change HALCoGen codes. Can you give more information about this ? And i have a one question too that what is the "U" in HALCoGen? Where defined?

Thank for your help.

Have a good day.

-CODES-

#include "sys_common.h"

#include "rti.h"
#include "het.h"
#include "gio.h"
int i;
bool j=0;

void main(void)
{

hetInit();
rtiInit();

gioSetDirection(hetPORT1, 0xFFFFFFFF);
pwmStart(hetRAM1, pwm0);

rtiEnableNotification(rtiNOTIFICATION_COMPARE0);

_enable_IRQ();

rtiStartCounter(rtiCOUNTER_BLOCK0);

while(1);

}

void rtiNotification(uint32 notification)
{

if (j==0)
{

if ( i < 70 )
{
i++;
if (i == 70 )
{
j=1;
}
}
}
if (j==1)
{

if ( i > 50 )
{
i--;
if (i == 50 )
{
j=0;
}
}
}
pwmSetDuty(hetRAM1, pwm0,i);

}

0 QJ Wang over 5 years ago in reply to Emre Ertonga

TI__Guru**** 199216 points

Hello,

Please refer to this post for 0%-100% duty cycle.

https://e2e.ti.com/support/microcontrollers/hercules/f/312/p/516382/1875161?tisearch=e2e-sitesearch&keymatch=100%25%20duty%20cycle#1875161

The suffix of "U' or "u" of a number (for example 0xFFC00008U) means "unsigned int". Some compilers assume that any number without a suffix like 'u' is of int type.

0 Emre Ertonga over 5 years ago in reply to QJ Wang

Prodigy 250 points

Thanks for your help,

Good Job.

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