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18F8722 Half Bridge PWM doesn't work?

 
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18F8722 Half Bridge PWM doesn't work?
PostPosted: Wed Feb 03, 2010 8:03 pm     Reply with quote
Hi Folks,

Trying to get a half bridge PWM working using the 18F8722 ECCP module. One of the outputs (P1A on C2) seems to work just great, but I can't seem to get anything out of the other one (P1B on H7). See my code below.

Thanks!
Greg

Header File:
Code:

#include <18F8722.h>
#device adc=8

#FUSES NOWDT                    //No Watch Dog Timer
#FUSES WDT128                   //Watch Dog Timer uses 1:128 Postscale
#FUSES HS                       //High speed Osc (> 4mhz for PCM/PCH) (>10mhz for PCD)
#FUSES NOPROTECT                //Code not protected from reading
#FUSES IESO                     //Internal External Switch Over mode enabled
#FUSES NOBROWNOUT               //No brownout reset
#FUSES BORV25                   //Brownout reset at 2.5V
#FUSES NOPUT                    //No Power Up Timer
#FUSES NOCPD                    //No EE protection
#FUSES STVREN                   //Stack full/underflow will cause reset
#FUSES NODEBUG                  //No Debug mode for ICD
#FUSES NOLVP                    //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOWRT                    //Program memory not write protected
#FUSES NOCPB                    //No Boot Block code protection
#FUSES NOEBTRB                  //Boot block not protected from table reads
#FUSES NOEBTR                   //Memory not protected from table reads
#FUSES NOWRTD                   //Data EEPROM not write protected
#FUSES NOWRTC                   //configuration not registers write protected
#FUSES NOWRTB                   //Boot block not write protected
#FUSES FCMEN                    //Fail-safe clock monitor enabled
#FUSES LPT1OSC                  //Timer1 configured for low-power operation
#FUSES MCLR                     //Master Clear pin enabled
#FUSES NOXINST                  //Extended set extension and Indexed Addressing mode disabled (Legacy mode)
#FUSES MCU                      //Microcontroller Mode
#FUSES NOWAIT                   //Wait selections unavailable for Table Reads or Table Writes
#FUSES BW16                     //16-bit external bus mode
#FUSES ABW20                    //20-bit Address bus
#FUSES ECCPE                    //Enhanced CCP PWM outpts multiplexed with RE6 thorugh RE3

#use delay(clock=20000000)
#use rs232(baud=9600,parity=N,xmit=PIN_C6,rcv=PIN_C7,bits=8,errors)
#use i2c(Slave,Fast,sda=PIN_C4,scl=PIN_C3,address=0xA0)

#define PR2 0xFCB
#define CCPR1L 0xFBE
#define ECCP1DEL 0xF79
#define CONFIG3H 0x300005
#define TRISC 0xF94
#define TRISD 0xF95
#define TRISH 0xF99
#define CCP1CON 0xFBD
#define ECCP1 CCP1CON
#define ECCP1AS 0xFB6

#define RED_LED PIN_B5
#define YELLOW_LED PIN_B4
#define GREEN_LED PIN_A5

void Initialize(void);


Code:
Code:

#include "C:\Documents and Settings\Administrator\Desktop\GBCWMII EE4040-PWM\OutputStage.h"
  #include <stdlib.h>


void main() {
   Initialize();
   // TODO: USER CODE!!
   while(1) {
      //output_high(PIN_H7);
      output_high(GREEN_LED);
      delay_ms(100);
      //output_low(PIN_H7);
      output_low(GREEN_LED);
      delay_ms(100);
      //output_high(PIN_H7);
      output_high(YELLOW_LED);
      delay_ms(100);
      //output_low(PIN_H7);
      output_low(YELLOW_LED);
      delay_ms(100);
      //output_high(PIN_H7);
      output_high(RED_LED);
      delay_ms(100);
      //output_low(PIN_H7);
      output_low(RED_LED);
      delay_ms(100);
   }
}

void Initialize(void) {
   *TRISC = 0x00; //Set Port C to outputs.
   *TRISD = 0x00; //Set Port D to outputs.
   *TRISH = 0x00; //Set Port H to outputs.
   output_high(PIN_H7);
   
   setup_adc_ports(NO_ANALOGS|VSS_VDD);
   setup_adc(ADC_OFF|ADC_TAD_MUL_0);
   setup_psp(PSP_DISABLED);
   setup_wdt(WDT_OFF);
   setup_timer_0(RTCC_INTERNAL);
   setup_timer_1(T1_DISABLED);
   setup_timer_2(T2_DIV_BY_1,0,1);//(mode,period,postscale);
   setup_timer_3(T3_DISABLED|T3_DIV_BY_1);
   setup_timer_4(T4_DISABLED,0,1);
   setup_comparator(NC_NC_NC_NC);
   setup_vref(FALSE);
   setup_low_volt_detect(FALSE);
//Setup_Oscillator parameter not selected from Intr Oscillator Config tab
   
   
   SETUP_CCP1(CCP_PWM|CCP_PWM_HALF_BRIDGE|CCP_PWM_H_H);
   //CP1CON = 0x8c;
   *CONFIG3H = 0x81; //Multiplexes P1B from RE6 onto RH7
   *PR2 = 24; //Period = 4 * Tosc *(PR2+1) * TMR2Prescaler
   *CCPR1L = 0x0c; //Duty Cycle = Tosc * (CCPR1L<7:0>:CCP1CON<5:4>) * TMR2Prescaler -- for ease of use, ignore LSBs.
   *ECCP1DEL = 0x03|0x80; //Delay = 4 * Tosc * (ECCP1DEL<6:0>)
   *ECCP1AS = 0x00; //ECCP outputs are operating
}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Feb 03, 2010 8:18 pm     Reply with quote
Post your compiler version.
Guest
PostPosted: Wed Feb 03, 2010 8:48 pm     Reply with quote
Hi sorry, it turns out that once I had the fuse set like this #FUSES ECCPE, the PWM output could not be changed in software:

Code:

*CONFIG3H = 0x81;


Changing the fuse to #FUSES ECCPH fixed the problem entirely. Sorry for the bother.

Cheers,
Greg
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