MSP430FR2311: MSP430FR2311 P.W.M

Please see below pic of the signals.

Hello Aharon,

How (what instruction to you use) to set or clear P1.1?

hi Dennis ,

i am using  P1.1 as input or output.

here i define the port:

#define R_Ref_OUT            P1DIR |=  BIT1;        // P1.1  as Out
#define R_Ref_out_ON       P1OUT |=  BIT1;        // P1.1   Reference Resistor  I/O ON
#define R_Ref_out_OFF     P1OUT &= ~BIT1;        // P1.1   Reference Resistor  I/O OFF
#define R_Ref_IN               P1DIR &= ~BIT1;        // P1.1  as In

and here i use it:

   
   
   R_Ref_OUT;  
  R_Ref_out_ON ; //    <<<<<PWM out go to 1V is happen here
  
   for(Counter_Time = 0;Counter_Time < 10000; Counter_Time++);
   
   R_Sens_IN;
   R_Ref_out_OFF;

Thanks
Aharon
   

Hi Aharon,

Not sure what is happening. Checked for errata and found nothing.
If you don't enable the PWM output, does the P1.7 toggle when you set/clr P1.1?
What are your P1SEL settings for that port?
Is there anything connected to P1.7?

hi

After many hours of research without result.
now i understand that the whole picture is missing and I will spread what I know with hope for help.
I work with these parts: 

1. eCOMP0

2.Timer B0.2 as  PWM  and output on P1.7

3. P1.0 as input for V+ terminal , DAC as input for V- terminal

4. P1.1 ,P1.2  as input/output

5. VCC = 3.3V

while PWM   (on P1.7 ) working and eCOMP0 is OFF i can use P1.1 ,P1.2 NORMAL and PWM voltage level is 3.3V.

while PWM   (on P1.7 ) working and  eCOMP0 is ON  if P1.1  or  ,P1.2   ON  PWM ( on P1.7 ) voltage level is 1V.

There seems to be a connection between Timers and eCOMP0  and you can not work with them together.

here i set the  eCOMP :

//---------------------- Setup eCOMP ------------------------------
 
  TRI0CTL |= TRIPSEL1 | TRIPSEL0;
  P1SEL0 |= BIT0;                                 // Select eCOMP input function on P1.0 /C0
  P1SEL1 |= BIT0;
 
  CPCTL0 &= ~CPPSEL0;                  // Select C0 on P1.0 as input for V+ terminal
  CPCTL0 |= CPNSEL1 | CPNSEL2;         // Select DAC as input for V- terminal
  CPCTL0 &= ~CPNSEL0;
  CPCTL0 |= CPPEN | CPNEN;             // Enable eCOMP input
  CPCTL1 |= CPIIE ; 
  CPDACCTL |= CPDACEN;                // Select VCC as reference and enable DAC
  CPDACDATA |= 10;                    // CPDACBUF1 = 10/64 * 3.3V = 0.515V as reference
  CPCTL1 |= CPEN | CPMSEL ;                           // Turn on eCOMP, in high speed mode
  CPINT &= ~CPIFG;                   // Clear Interrupt flag 
  CPINT &= ~CPIIFG;                  // Clear Interrupt flag 
  
  
  
 //------------------------------------------------------------------------    

here the PWM  functions 

void PWM_ON(unsigned int DC)
{
    TB0CTL = MC_0;
    TB0CCR0 = 31250-1;                        // PWM Period 1.5MHZ timer input
    TB0CCTL2 = OUTMOD_3;                      // CCR2 reset/set
    TB0CCR2 = DC;                            // CCR2 PWM duty cycle
    TB0CTL = TBSSEL__SMCLK | MC__UP  | TBCLR;  // SMCLK, up mode, clear TBR
  
}                              



void PWM_OFF(void)
{
 
  TB0CCTL2 = OUTMOD_0;                      // PWM_OF  CCR1 reset/set
  TB0CTL = TBSSEL_2 + MC_0 + TBCLR;        //PWM_OF
 
}

here i use the  P1.1 ,P1.2 that lead to PWM out to be 1V instead 3.3V

 //------------Chargeing
   
   R_Sens_OUT;
   R_Ref_OUT;  
   R_Sens_out_ON;  // >>>>  PWM go to 1V
   R_Ref_out_ON ;  // >>>>  PWM go to 1V
  
   for(Counter_Time = 0;Counter_Time < 10000; Counter_Time++);
   
   R_Sens_IN;
   R_Ref_out_OFF;
   

I hope it's clearer now. At the moment, my conclusion is that it is impossible to operate PWM and  eCOMP at seam time

And I do not know why....

Thanks

Aharon

 

Aharon,

In an effort to try to understand better your application, is there anything connected to P1.1?  I noticed comment about reference resistor.  I was wandering if you are using a voltage divider powered by P1.1 output and the the divider output is connected to P1.0 (v+ on the comparator).

Also, regarding setting the following register bits, what is your intended purpose for your application?

TRI0CTL |= TRIPSEL1 | TRIPSEL0;

According to the datasheet, the configuration you chose is not used.

hi Dennis ,

Many thanks.

regarding P1.1 , P1.0 ,P1.2  i am implementing  slope A2D   with comperator to calculate NTC Temperature resistor like

Application Report  SLAA129B .

.its a well known TI application. I used it many times  with PWM with a many TI processors and here  on MSP430FR2311  I got into trouble and cant implant  comperator  slope A2D   with  PWM.

here you can see this part on my scheme:

regarding :TRI0CTL |= TRIPSEL1 | TRIPSEL0; 

I saw that there might be a connection to TIA  module and while trying  to find a solution I thought to disconnect P1.7 from TIA.

Of course it did not help,,,

Thanks

Aharon.

Hi Aharon,

I have reached out to one of experts for these peripherals on this device.

hi Dennis ,

thanks i will wait for your update.

do you need any more information or code?

Aharon.

hi Mitch

yes i can... but how you can use it?? FR2311 launchpad  is  without the peripherals i have on my board?

Maybe you want to build something  around   FR2311 launchpad ?

  Thanks

 Aharon.

Hey Aharon,

Just wanted to let you know I am still working on this and will provide an update soon.

Thanks,

Mitch

hi Mitch,

thanks.

I'm really stuck with it.
You still want my  full code ?

Aharon.

Hi Mitch.

first i will say it work ,  just add  this SYSCFG2 |= TB0TRGSEL__EXTERNAL.

After you have given a solution I also looked for ... and found the place that explains it more clearly

 

I do not know how long you've devoted to it.  I gave it ... two whole days and I gave up.
I have to say that it could have been written more user-friendly and thus prevent all the time lost.
I am very grateful to you for all the effort invested in helping a stuck client.

Thanks

Aharon.

Hi Aharon,

I'm glad we were able to find the source of the issue! I apologize for the inconvenience and frustration. I hope the rest of your development goes smoothly.

Thanks,

Mitch