Hello Community People ,
We are using PWM module in one of our application
configured these pins as PWM
GPIO_EMC_28 as FLEXPWM2_A3
GPIO_EMC_29 as FLEXPWM2_B3
We are operating the PWM with 1KHz
As known the submodule 3 is a independent module which includes A3 and B3 , when we are trying to change the duty cycle of A3 and B3 in back to back instructions i am not able to see the update on B3
if we do it this way ,
change Duty cycle of B3 first by writing VAL4,VAL5 and in next instruction we change the duty if A3 by writing VAL2 and VAL3 we are not able to see update on A3 and this is vice versa
When we give a 1 ms delay between both instructions we are able to see the change as required ,
can someone explain what could be the problem , is there any minimum time delay we need to give to access the same register ?
here is a sample code
Case 1: First change B3 and next A3 , A3 not getting updated
PWM_Setup(PWM2,kPWM_PwmB,kPWM_Module_3,pwmFrequencyInHz,dutyCyclePercent); PWM_SetPwmLdok(PWM2, kPWM_Control_Module_3 , true);
PWM_StartTimer(PWM2, kPWM_Control_Module_3 );
PWM_Setup(PWM2,kPWM_PwmA,kPWM_Module_3,pwmFrequencyInHz,dutyCyclePercent);
PWM_SetPwmLdok(PWM2, kPWM_Control_Module_3 , true);
PWM_StartTimer(PWM2, kPWM_Control_Module_3 );
Case 2: First change A3 and next B3 , B3 not getting updated
PWM_Setup(PWM2,kPWM_PwmA,kPWM_Module_3,pwmFrequencyInHz,dutyCyclePercent); PWM_SetPwmLdok(PWM2, kPWM_Control_Module_3 , true);
PWM_StartTimer(PWM2, kPWM_Control_Module_3 );
PWM_Setup(PWM2,kPWM_PwmB,kPWM_Module_3,pwmFrequencyInHz,dutyCyclePercent);
PWM_SetPwmLdok(PWM2, kPWM_Control_Module_3 , true);
PWM_StartTimer(PWM2, kPWM_Control_Module_3 );
Working condition: When delay of 1 ms is added between these updates both are getting updated
PWM_Setup(PWM2,kPWM_PwmA,kPWM_Module_3,pwmFrequencyInHz,dutyCyclePercent); PWM_SetPwmLdok(PWM2, kPWM_Control_Module_3 , true);
PWM_StartTimer(PWM2, kPWM_Control_Module_3 );
Delay_ms(1);
PWM_Setup(PWM2,kPWM_PwmB,kPWM_Module_3,pwmFrequencyInHz,dutyCyclePercent);
PWM_SetPwmLdok(PWM2, kPWM_Control_Module_3 , true);
PWM_StartTimer(PWM2, kPWM_Control_Module_3 );
Is there any minimum time we need to provide before the update to same register ?
Anticipating a quick reply
Regards ,
Naren
