PWM using CCS and Proteus

[toasted siopao]

I have been trying to create a PWM in CCS using PIC16F648A, natry ako mag simulate sa proteus pero wala lumalabas sa RB3.

INTRC ang gamit ko, may nakapagtry na ba gumawa ng PWM using the builtin hardware ng PIC.

Thanks.

[marcelino]

I have been trying to create a PWM in CCS using PIC16F648A, natry ako mag simulate sa proteus pero wala lumalabas sa RB3.

INTRC ang gamit ko, may nakapagtry na ba gumawa ng PWM using the builtin hardware ng PIC.

Thanks.

glen, nahirapan din akong gawin yan sa CCS C. di ko nga nagawa talga... ilang beses na namin yan kinulit ni Rafft. di talga...

I ended up using HitechC. para lang mapagana ang PWM ng PIC16F628A.

Subukan ko kayan register to register ang usapan... heheh

[0b00000111]

glen, nahirapan din akong gawin yan sa CCS C. di ko nga nagawa talga... ilang beses na namin yan kinulit ni Rafft. di talga...

I ended up using HitechC. para lang mapagana ang PWM ng PIC16F628A.

Subukan ko kayan register to register ang usapan... heheh

ibig sabihin parang may problem yung CCS pagdating jan? nainvenstigate ba yung disassembly listing?

[marcelino]

eto... its working! based lahat sa datasheet... heheh
dinifine ko lahat!

Code: [Select]

#include <16F648A.h>

#FUSES NOWDT,INTRC_IO,NOPUT,NOPROTECT,NOBROWNOUT,MCLR,NOLVP,NOCPD     

#BYTE CCP1CON=0x17
#BYTE T2CON=0x12
#BYTE PR2=0x92
#BYTE CCPR1L=0x15

#bit  OSCF=0x8E.3
#bit  TRISB3=0x86.3

#bit  CCP1X=CCP1CON.5
#bit  CCP1Y=CCP1CON.4
#bit  CCP1M3=CCP1CON.3
#bit  CCP1M2=CCP1CON.2
#bit  CCP1M1=CCP1CON.1
#bit  CCP1M0=CCP1CON.0

#bit  TOUTPS3=T2CON.6
#bit  TOUTPS2=T2CON.5
#bit  TOUTPS1=T2CON.4
#bit  TOUTPS0=T2CON.3
#bit  TMR2ON=T2CON.2
#bit  T2CKPS1=T2CON.1
#bit  T2CKPS0=T2CON.0



void main()
{
   
   OSCF = 1;         //4MHZ internal oscillator

   CCP1M3 = 1; CCP1M2 = 1;      //CCP PWM mode   
   
   T2CKPS1 = 0; T2CKPS0 = 1;   //prescale 1:4
   
   //given: 5Khz PWM
   //PWM period = [PR2 + 1]*4*Tosc*TMR2prescale   
   //1/5k = (PR2+1)*4*(1/4M)*4
   //PR2 + 1 = 4000000/(5000*4*4)
   //PR2 = 49
   PR2 = 49;
   
   //duty cycle = 50%; PR2 *2 = 98 = 0b1100010
   CCPR1L = 0b00011000;
   CCP1X = 1; CCP1Y = 0;

   TRISB3 = 0;               //RB3 as output
   
   TMR2ON = 1;                //timer2 ON
   
   while(TRUE);

}

di ako marunong masyado magbasa ng LST... papano ba sis?

[toasted siopao]

Kabwisit nga eh, kanina pa ako kakaisip kung ano diprensa ng code ko!

Kahit yung sa CCS forums na example na-try ko na using PIC16F877A eh wala pa rin!

Code ko sa PIC16F877A

Code: [Select]

void main()
{

   setup_adc_ports(NO_ANALOGS);
   setup_adc(ADC_OFF);
   setup_spi(SPI_SS_DISABLED);
   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DIV_BY_16,124,1);
   setup_ccp1(CCP_PWM);
   set_pwm1_duty(512);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);

   // TODO: USER CODE!!
   
   while(1);

}
Code sa CCS C forum, both not working!

Code: [Select]

#include <16F877.h>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)

main()
{
output_low(PIN_C1);   // Set CCP2 output low
output_low(PIN_C2);   // Set CCP1 output low

setup_ccp1(CCP_PWM);  // Configure CCP1 as a PWM
setup_ccp2(CCP_PWM);  // Configure CCP2 as a PWM

setup_timer_2(T2_DIV_BY_16, 124, 1);  // 500 Hz     
set_pwm1_duty(31);                    // 25% duty cycle on pin C2
set_pwm2_duty(62);                    // 50% duty cycle on pin C1

while(1);  // Prevent PIC from going to sleep  (Important !)
}

[marcelino]

pero try mo same code sa ibang PIC16F its working.

library issue lang naman siguro.

[toasted siopao]

Sa iba? PIC16F877A na gamit ko. Ano si mga na try mo?

[marcelino]

ay sorry... dai man palan. naribong ako. CCP capture palan si naiisip ko...

[toasted siopao]

Bro, nakua ko na, dai nag o-on ag timer 2, dapat mag execute ka TMR2ON=1; tig chop chop ko ang put@ng in@!

[marcelino]

hahaha pareho kita... uyan man.

Code: [Select]

#include <16F648A.h>

#FUSES NOWDT,INTRC_IO,NOPUT,NOPROTECT,NOBROWNOUT,MCLR,NOLVP,NOCPD


void main()
{
   setup_oscillator(OSC_4MHZ);
 
   setup_timer_2(T2_DIV_BY_4,249,1);
   set_pwm1_duty(512);
   setup_ccp1(CCP_PWM);
  
   set_timer2(0);       //add this after setting everything for PWM.
                        //this is PR2
  
   while(TRUE);

}

[toasted siopao]

nalingawan yan ilaag sa documenttation ah.

[marcelino]

^iyo ngani... dai ko pa man yan nababasa...

ok na yan. at least aram ta na.