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Problem using PWM and other Port C outputs - 16f916

 
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zagoaristides



Joined: 08 Jul 2007
Posts: 15
Location: Cordoba - Argentina

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Problem using PWM and other Port C outputs - 16f916
PostPosted: Tue Aug 07, 2012 7:13 am     Reply with quote
Well, I can't figure out how to make PWM and PORTC outputs work together.

This is the code
Code:

void main()
{
 
   int var, i, Start_Iniciado, var_input, var_mostrar;
   int1 var1;
   int1 arranque_inicial;

   setup_adc_ports(sAN0|sAN1|VSS_VDD);
   setup_adc(ADC_CLOCK_INTERNAL);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_8); //1 ms
   //setup_wdt(WDT_2304MS|WDT_DIV_16);
   setup_timer_1(T1_INTERNAL|T1_DIV_BY_1); //32 ms
   setup_timer_2(T2_DIV_BY_1,255,1); //15 Khz
   setup_ccp1(CCP_PWM);
   setup_comparator(NC_NC_NC_NC);
   
   //set_tris_c(0b00010000); I also try fast input output
   
   //TODO: User Code

 // INICIALIZACION DE VARIABLES, SALIDAS Y ENTRADAS IMPORTANTES
 
   output_high (PIN_OUT_STOP);
   var_decremeta_cuenta_xa_1_seg = cuenta_xa_1_seg;
   
   flag_blink_Power_LED = FALSE;
   flag_blink_Stop_LED = FALSE;
   flag_blink_Sensor_LED = FALSE;
   flag_blink_S_Corr_LED = FALSE;
   
   flag_STOP = TRUE;
   flag_START = FALSE;
   flag_Sobre_Corr = FALSE;
   
   Start_Iniciado = FALSE;
   sent_giro = sent_enroscando;


   //enable_interrupts(INT_AD);
   enable_interrupts (INT_EXT);
   enable_interrupts (INT_TIMER1);
   //enable_interrupts (INT_TIMER0);
   
   stop();

   
   enable_interrupts(GLOBAL);

   



   flag_SENS_PUNTA = TRUE;
   arranque_inicial = TRUE;
   for(;;)
   {
   restart_wdt();

   if ( flag_START == FALSE && flag_STOP == FALSE){
   
      //pot timer
   set_adc_channel (1);
   delay_us(30);
   timer_segs = read_adc();
   delay_us(30);
   
   var_decrementa_timer_segs = timer_segs;
   

   }

//THIS IS THE GREAT PROBLEM with Output and PWM
//IF I take out this output_c code, everything works fine

   if (var_BCD_timer_nums != var_BCD_timer_nums_anterior){     
      //var_decrementa_timer_segs--;     
      //var_input = input_c();
      var_mostrar = var_BCD_timer_nums;
      output_c(BCD_numbers[var_mostrar]);   
      var_BCD_timer_nums_anterior = var_BCD_timer_nums;
   }

   //
   if (var_decrementa_timer_segs == 0 && flag_START == TRUE){
      flag_STOP = TRUE;
      //flag_START = FALSE;
      //var_input = input_c();
      var_mostrar = 14; // Letra t = Terminado
      output_c(BCD_numbers[var_mostrar]); 
      delay_ms(1000);
   }
     
   
// Boton Stop
      if (flag_STOP == TRUE || (var_veloc_motor_pote > 120 && var_veloc_motor_pote < 130)){
         
         flag_START = FALSE;
         Start_Iniciado = FALSE;
         arranque_inicial = FALSE;
         stop();
      }

   
      if (Start_Iniciado == TRUE && ( (var_veloc_motor_pote_anterior != var_veloc_motor_pote) || arranque_inicial == TRUE ) ){

      //disable_interrupts(INT_TIMER1);

         arranque_inicial = FALSE;
         
         if (var_veloc_motor_pote > 130){
            sent_giro = sent_enroscando;
            var_veloc_motor = var_veloc_motor_pote * 2;
            veloc_motor();
         }
     
         if (var_veloc_motor_pote < 120){
            sent_giro = sent_desenroscando;
            var_veloc_motor = 255 - var_veloc_motor_pote * 2;
            veloc_motor();
         }
         
         var_veloc_motor_pote_anterior = var_veloc_motor_pote;
      }
     
     // Start

      if (flag_START == TRUE && Start_Iniciado == FALSE && flag_STOP == FALSE && flag_SENS_PUNTA == TRUE){
     
         flag_STOP = FALSE;
         Start_Iniciado = TRUE;
         arranque_inicial = TRUE;
         
         output_LOW(PIN_OUT_STOP_LED);
         output_HIGH(PIN_OUT_Power_LED); 
         flag_blink_Power_LED = TRUE;
      }
     
////// Control de Sobre Corriente ///////////

      if (flag_S_Corr == TRUE){
         flag_STOP = TRUE;
         flag_PITIDO = TRUE;
         output_HIGH(PIN_OUT_S_Corr_LED);
         flag_blink_Stop_LED = TRUE;
         cuenta_xa_S_Corr = 0;
         }
      if (flag_S_Corr == FALSE && flag_PITIDO == TRUE){
         flag_PITIDO = FALSE;
 
      }
 



   }



}




void stop (void){

int var_input, var_mostrar;
   
   var_veloc_motor = 0 ;
   veloc_motor();   
   output_LOW(PIN_OUT_STOP); //ENABLE of L293
   flag_STOP = FALSE;
   
}

void veloc_motor (void)
{
   if (sent_giro == sent_enroscando)
      output_low(PIN_OUT_Sent_Giro);
   if (sent_giro == sent_desenroscando)
      output_high(PIN_OUT_Sent_Giro);
     

   if (sent_giro == sent_enroscando)
      set_pwm1_duty (var_veloc_motor);
   if (sent_giro == sent_desenroscando)
      set_pwm1_duty (255 - var_veloc_motor); 

   output_HIGH(PIN_OUT_STOP); //el ENABLE del Integrado L293
}
Ttelmah



Joined: 11 Mar 2010
Posts: 19559

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PostPosted: Tue Aug 07, 2012 11:16 am     Reply with quote
With standard_io selected, 'input_c' says set the TRIS for the whole of port C, to input. This immediately stops the PWM (which requires the ccp pin set as an output), from working.

Choices:

1) Switch to using fast_io, and set the tris yourself.
2) Switch to using fixed_io, and set the CCP pin as an output.
3) Immedately after the input line, add 'output_drive',on the CCP pin.

Best Wishes
zagoaristides



Joined: 08 Jul 2007
Posts: 15
Location: Cordoba - Argentina

View user's profile Send private message Visit poster's website ICQ Number

PostPosted: Tue Aug 07, 2012 12:19 pm     Reply with quote
Ttelmah wrote:
With standard_io selected, 'input_c' says set the TRIS for the whole of port C, to input. This immediately stops the PWM (which requires the ccp pin set as an output), from working.

Choices:

1) Switch to using fast_io, and set the tris yourself.
2) Switch to using fixed_io, and set the CCP pin as an output.
3) Immedately after the input line, add 'output_drive', on the CCP pin.

Best Wishes


Thanks a lot, I never used that output_drive function. By the way I figured out how to make it work by making an output bit by bit, like this.

Code:

      for(i = 56; i<60;i++) //PIN_C0 al PIN_C3
         output_bit(i,shift_right(&var_mostrar,1, pin_C0));
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