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Need to start PWM on PIC16F819

 
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motorjunkie
Guest
Need to start PWM on PIC16F819
PostPosted: Sat May 26, 2007 2:47 pm     Reply with quote
Hi guys,

I need a little help with getting PWM to start on pin RB3 of the 'F819.
I've read many of the posts and tried many of the recommended solutions. I just can't get the thing to work!

I'm trying to fire up a h bridge using PWM multiplexed on the low sides.

Any ideas how to solve this?

Here's my code>>

Code:

#include <16F819.h>
//#device ICD=FALSE
#device adc=8

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES HS                       //High speed Osc (> 4mhz)
#FUSES PUT                      //Power Up Timer
#FUSES MCLR                     //Master Clear pin enabled
#FUSES BROWNOUT                 //Reset when brownout detected
#FUSES LVP                      //Low Voltage Programming on B3(PIC16) or B5(PIC18)
#FUSES NOCPD                    //No EE protection
#FUSES NOWRT                    //Program memory not write protected
#FUSES NODEBUG                  //No Debug mode for ICD
#FUSES NOPROTECT                //Code not protected from reading
#FUSES CCPB3                    //CCP1 input/output multiplexed with RB3

#use delay(clock=10000000)

#define PWM_In       PIN_A0    //
#define Current       PIN_A1    //
#define HiSideA       PIN_A2    //
#define HiSideB       PIN_A3    //
#define HiSideC       PIN_A4    // Not used
//#define -----       PIN_A5    // Not used
//#define -----       PIN_A6    // Not used Xtal
//#define -----       PIN_A7    // Not used Xtal

#define LoSideB       PIN_B0
#define LoSideA       PIN_B1
#define LoSideC       PIN_B2
#define Mtr_PWM     PIN_B3
#define Tacho_out   PIN_B4
#define HallC       PIN_B5
#define HallA       PIN_B6
#define HallB       PIN_B7


void InitMCU()
{
   setup_adc_ports(AN0);
   setup_adc(ADC_CLOCK_DIV_2);
   
   setup_spi(FALSE);

   setup_timer_0(RTCC_INTERNAL|RTCC_DIV_256);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DIV_BY_1,500,1);

   setup_ccp1(CCP_PWM);

   enable_interrupts(INT_TIMER2);
   enable_interrupts(GLOBAL);

   setup_oscillator(False);

}


void main()
{

    InitMCU();
    InitHW();

        set_pwm1_duty(200L);

        output_high(Tacho_out);
        delay_ms(1000);
        output_low(Tacho_out);
        delay_ms(1000);
        output_high(Tacho_out);
        delay_ms(1000);
        output_low(Tacho_out);
        delay_ms(1000);
       
    do
    { 
        output_high(Tacho_out);
        delay_ms(100);
        output_low(Tacho_out);
        delay_ms(100);

   
    output_high(HiSideA);     
    output_high(LoSideB);
    delay_ms(500);
    output_low(HiSideA);     
    output_low(LoSideB);
    delay_ms(100);
   
    delay_ms(1000);
    }while(TRUE);

}
Ttelmah
Guest
PostPosted: Sat May 26, 2007 2:54 pm     Reply with quote
What pin does LVP use?.
Do you think this will work with a CCP output multiplexed onto it...

Best Wishes
Guest
PostPosted: Sat May 26, 2007 3:16 pm     Reply with quote
Doh!

I've changed the LVP to NOLVP and now it works!

Many thanks Grand Master Ttelmah, many thanks!
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