ALERTLINKS
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Use filter capacitor on ADC input pin. Make response slow that means slow down the rate of change of PWM. This is a hardware problem.
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DEFINE OSC 10
ON INTERRUPT GOTO UPDATE
FLAG VAR BIT
TMR1IF var PIR1.0 ' TMR1 interrupt flag
TMR1IE VAR PIE1.0
TMR2IF var PIR1.1 ' TMR2 interrupt flag
TMR2IE VAR PIE1.1
CCP1IE var PIE1.2
CCP1IF VAR PIR1.2
GIE VAR INTCON.7 ' Global Interupt Enable
PEIE VAR INTCON.6 ' Perif. Eq. Interupt Enable
PWM1 VAR PORTC.5 ' Alias servo pin1
PWM2 VAR PORTC.6 ' Alias servo pin2
TRISC = 0 ' Configure PORTC as outputs
PORTC = 0 ' Clear PORTB
'********************* Initiate the interrupt
FLAG = 1
T2CON = $36
PR2 = 223
TMR2IE = 1
INTCON = $C0
CCP1CON = %00001010
CCP1IE = 1
CCPR1H = $49
CCPR1L = $A8
T1CON = $01
TMR1IF = 0
MAIN:
GOTO MAIN
DISABLE
UPDATE:
IF CCP1IF = 1 THEN
CCP1IF = 0
PWM1 = 0
PWM2 = 0
ENDIF
IF TMR2IF = 1 THEN
TMR2IF = 0
TMR1H = 0
TMR1L = 0
IF FLAG = 1 THEN
PWM1 = 1
TOGGLE FLAG
ELSE
PWM2 = 1
TOGGLE FLAG
ENDIF
ENDIF
RESUME
ENABLE#define tx GPIO.GP5
unsigned TMR1 absolute 0x0E;
char current_dim = 0;
char done_flag = 0;
unsigned preload_time[10] = {65535,63823,63082,62481,61925,61370,60814,60259,59656,58916};
//******************************************************************************
//*** interrupt-on-change when zero-crossing occur, pre-load timer1 value
//*** turn on timer1 to perform delay before gate trigger
//*****************************************************
if(INTCON.GPIF){
tx = 1;
TMR1 = preload_time[current_dim]; //preload_time into Timer1
T1CON.TMR1ON = 1; //start timer1
INTCON.GPIF = 0;
}
//******************************************************************************
//*** perform gate trigger, turn off itself
//******************************************************************************
if(PIR1.TMR1IF){
T1CON.TMR1ON = 0; //stop timer1
tx = 0; //turn on triac
delay_us(150);
tx = 1; //turn off triac
PIR1.TMR1IF = 0; //clear interrupt flag
}
} #define switch RC4_bit // input switch on/off
#define Clock1 RC5_bit // PWM output#1
#define Clock2 RC6_bit // PWM output#2
// #define Switch_Pin 4 //enable switch input
// #define Switch_Port PORTC
// #define Debounce_Time 20
char flag; // regiter for flags
int duty; //16bit register for duty cycle
sbit flag1 at flag.B0; //flag for selecting period or duty cycle
sbit phase at flag.B1; //flag for selecting alernate phase
sbit enable at flag.B2; //flag to monitor input switch to enable inverter
void interrupt()
{
if(CCP1IF_bit)
{
if(flag1) //duty cycle selection
{
Clock2 = 0; // PWM2 output is switched off
Clock1 = 0; // PWM1 output is switched off
flag1=0;
CCPR1L = 0x03; // Load values in 16 bit register for 10000
CCPR1H = 0x27; // 1/2 duty cycle period. 10mS at 4 MHz
// if (Button(&Switch_Port, Switch_Pin, Debounce_Time, 0))
//
if(PORTC.F4 == 0) //If the switch is pressed
{ //read switch
enable=1; // flag to enable inverter output
}
else
{
enable=0; // flag to enable inverter output
}
{
TMR1H = 0x00; // Clear/Reset timer1 register
TMR1L = 0x00; //its 16bit
CCPR1H = duty/256;
CCPR1L = duty-CCPR1H*256; //Load value for PWM duty cycle from "duty" register
flag1=1; // select next interupt for duty cycle selection
}
if (enable)
{ // if inveter is enabled otherwise skip
if (phase) // selct phase1
{
asm nop;
Clock1 = 1; // PWM1 is set high
phase=0; // select next interupt for phase2
}
else
{
Clock2 = 1; // PWM2 is set high
phase=1; // select next interupt for phase1
asm nop;
}
}
// }
CCP1IF_bit = 0; // clear interupt flag
}
} // ISR ends...
}
void main()
{
TRISC = 0b00010000; // PORTC All Outputs except pin#4
PORTC = 0x00; // portc, all bits zero
flag1=1; // first select interupt for duty cycle
CCP1CON = 0b00001010; // trigger special event
CCP1IE_bit = 1;
TMR1IF_bit = 0;
GIE_bit = 1;
PEIE_bit = 1;
T1CON = 0x01;
duty=6666; // setduty cycle for 66.6%
while(1)
{
}
}