help me

[samco]

greetings! i m on my 2nd year project om do design inverter using pic16F, family microcontroller but
am having a challenge here am trying to archive a sine wave trough cpp1 as the spwm signal and use C1 and C2 as complementary for pwm of 50hz to drive with HCF4081 quad gate to drive my h bridge but am still not getting any pulse at the pins here is my code so

'federal polytechnic nedede '
' code 144, '
'Soft Start, 50Hz H-Bridge Logic, SPWM (RC2), with Voltage Feedback'

chip 16f887, 8

option explicit

' ----- I/O Directions -----
Dir PORTC.0 Out ' L/H Enable Output (inverter active state)
Dir PORTC.1 Out ' H-Bridge Logic A (50Hz)
Dir PORTC.2 Out ' PWM output (SPWM )
Dir PORTC.3 Out ' H-Bridge Logic B (50Hz)
Dir PORTB.1 In ' Inverter ON/OFF switch (with pull-up)
Dir PORTB.4 Out ' Inverter Indicator LED

' ----- Variables -----
Dim sineIndex As Byte
Dim direction As Byte
Dim dutyValue As Word
Dim inverterOn As Bit
Dim softStartDone As Bit
Dim pwmFreq As Word
Dim pwmStepFreq As Word

' ----- Setup -----
direction = 0
sineIndex = 0
softStartDone = 0
pwmFreq = 1566 ' ~Start soft at 1.5kHz for 8MHz (half of 3132-200)
pwmStepFreq = 40 ' Lower ramp step due to slower base clock

' ----- PWM Init -----
HPWM 1, pwmFreq, 0

' ----- Timer2 for stepping sine -----
T2CON = 0b00000101 ' 1:4 prescaler
PR2 = 99 ' ~20kHz at 8MHz
PIE1.1 = 1 ' Enable TMR2 match
INTCON.6 = 1
INTCON.7 = 1
On Interrupt Timer2Match Call HandleSPWM

' ----- Main Loop -----
Do
inverterOn =(PORTB.1 = 0) ' Button pressed (active low)

If inverterOn =0 Then
    PORTC.0 = 1     ' L/H active
    PORTB.4 = 1     ' Inverter LED

    ' Soft Start: gradually increase PWM frequency
    If Not softStartDone Then
        If pwmFreq < 20000 Then
            pwmFreq = pwmFreq + pwmStepFreq
            HPWM 1, pwmFreq, 20
            Wait 100 ms
        Else
            softStartDone = 1
        End If
    End If
Else
    PORTC.0 = 0
    PORTB.4 = 0
    HPWM 1, pwmFreq, 0
End If

Loop

' ----- Interrupt Handler for 50Hz Logic Switching and SPWM -----
Sub HandleSPWM
If softStartDone Then
' Toggle H-Bridge polarity every half-cycle
If sineIndex = 0 Then
direction = 1 - direction
If direction = 1 Then
PORTC.1 = 1 : PORTC.3 = 0
Else
PORTC.1 = 0 : PORTC.3 = 1
End If
End If

    ' Read sine value and scale it to 10-bit range for 8MHz
    ReadTable sineTable, sineIndex, dutyValue
    dutyValue = dutyValue * 4     ' Scale 8-bit sine to 10-bit duty (0–1023)
    HPWM 1, pwmFreq, dutyValue    ' Set 10-bit PWM duty

    sineIndex = sineIndex + 1
    If sineIndex >= 77 Then sineIndex = 0
End If

CCPR1L = dutyValue
;TMR2IF = 0
PIR1.1 = 0 ' Clear Timer2 interrupt flag
End Sub
' ----- Sine Table (77-step half-cycle) -----
Table sineTable
0,8,17,26,35,44,53,62,71,80,89,97,106,115,123,132,140,148,157,165,173,181,189,196,204,212,219,226,233,240,247,254,261,267,274,280,286,292,298,303,309,314,319,324,328,333,337,341,344,348,351,354,356,359,361,363,365,366,368,369,370,371,372,372,373,373,373,373,372,372,371,370,369,368,366,365,363,361
End Table

[Anobium]

https://github.com/GreatCowBASIC/Demonstration_Sources?search=1

A great place to start. Do a search for sine.

[samco]

thank you for respond , ok let me look into it and see what i can do then am running out off time

[samco]

@anobium honestly i have checked down the link, i couldn't understand as a newbie in coding it seems more professional without commenting on them while the inverter full code i saw was using deep memory language not for beginners like me, if someone can easily correct my code i will be much happy. i even trying using updatepwm function which work on ccp1 without outputting frq, and control on it, please mr @anobium if you can help me out i will glad

[Anobium]

Many errors.

I f you load the code below into GCCODE then all the errors and serious comments will be in RED.

Evan

' ==== Pure Sine Wave Inverter (PIC16F72 - 16MHz) ====
' Includes: Soft Start, 50Hz H-Bridge Logic, SPWM (RC2), Voltage Feedback, Protections

#chip 16f887, 16
#option explicit

' ----- I/O Directions -----
Dir PORTC.0 Out  ' L/H Enable Output (inverter active state)
Dir PORTC.1 Out  ' H-Bridge Logic A (50Hz)
Dir PORTC.2 Out  ' PWM output (SPWM)
Dir PORTC.3 Out  ' H-Bridge Logic B (50Hz)
Dir PORTC.5 Out  ' Buzzer
Dir PORTC.6 Out  ' Fan
Dir PORTC.7 Out  ' Relay
Dir PORTB.1 In   ' Inverter ON/OFF switch (with pull-up)
Dir PORTB.3 Out  ' Grid Indicator LED
Dir PORTB.4 Out  ' Inverter Indicator LED
Dir PORTB.5 Out  ' Battery Low Indicator
Dir PORTB.6 Out  ' Overload Indicator
Dir PORTB.7 Out  ' Charging Indicator

' ----- ADC Channels -----
' AN0: Grid Sense
' AN1: AC Voltage Feedback
' AN2: Battery Level
' AN3: Charge Current
' AN4: Overload Detection

' ----- Variables -----
Dim sineIndex As Byte
Dim direction As Byte
Dim dutyValue As Word
Dim acFeedback As Word
Dim batteryLevel As Word
Dim gridLevel As Word
Dim overloadValue As Word
Dim inverterOn As Bit
Dim softStartDone As Bit
Dim pwmFreq As Word
Dim pwmStepFreq As Word



' ----- Setup -----
direction = 0
sineIndex = 0
softStartDone = 0
pwmFreq = 3132   ' Start soft at ~3.1kHz
pwmStepFreq = 80 ' Soft start ramp step

' ----- PWM Init -----
HPWM 1, pwmFreq, 0
HPWMOff
' ----- Timer2 for stepping sine -----

//! All this is overwriting the T2CON, PR2 setup up in HPWM 1,xx,xx
/* 
T2CON = 0b00000101      ' 1:4 prescaler
PR2 = 99                ' ~20kHz at 16MHz
PIE1.1 = 1              ' Enable TMR2 match
*/

//! All this is overwriten by On Interrupt Timer2Match Call HandleSPWM
/*
INTCON.6 = 1
INTCON.7 = 1
 */

On Interrupt Timer2Match Call HandleSPWM

' ----- Main Loop -----
Do
    inverterOn = (PORTB.1 = 0) ' Button pressed (active low)

    ' Grid detection
    gridLevel = ReadAD10(AN0)
    If gridLevel > 300 Then
        PORTC.0 = 0
        PORTB.3 = 1 ' Grid LED
        PORTB.4 = 0
        HPWM 1, pwmFreq, 0
       ' Continue
    Else
        PORTB.3 = 0
    End If

    If inverterOn Then
        PORTC.0 = 1     ' L/H active
        PORTB.4 = 1     ' Inverter LED



        ' Soft Start: gradually increase PWM frequency
        If   Not softStartDone Then

            If pwmFreq < 20000 Then
                pwmFreq = pwmFreq + pwmStepFreq
                HPWM 1, pwmFreq, 20
               ; Wait 100 ms
            Else
                softStartDone = 1

        End If
        End If
    Else
        PORTC.0 = 0
        PORTB.4 = 0
        HPWM 1, pwmFreq, 0
    End If

Loop

' ----- Interrupt Handler for 50Hz Logic Switching and SPWM -----
Sub HandleSPWM
    If softStartDone Then
        ' Toggle H-Bridge polarity every half-cycle
        If sineIndex = 0 Then
            direction = direction -1 
            If direction = 1 Then
                PORTC.1 = 1 : PORTC.3 = 0
            Else
                PORTC.1 = 0 : PORTC.3 = 1
            End If
        End If

        ' Read sine value and scale it to 10-bit range for 16MHz
        ReadTable sineTable, sineIndex, dutyValue
        //! Slow!!!   Use 4 rotates rather than maths
        dutyValue = dutyValue * 4     ' Scale 8-bit sine to 10-bit duty (0–1023)

        //! This is an 8-bit PWM duty. See the Help.
        //!  See demo - C:\GCstudio\gcbasic\demos\PWM_Solutions\8_9_10_bit_PWMCPP_Examples\PWM_Variable_mode_8bit_10bit.gcb - to leverage 10-bit PWM
        HPWM 1, pwmFreq, dutyValue    ' Set 10-bit PWM duty

        sineIndex = sineIndex + 1
        If sineIndex >= 77 Then sineIndex = 0
    End If

    //! This is messing up the Timer2 controlled by HPWM
    // TMR2IF = 0
End Sub
' ----- Sine Table (77-step half-cycle) -----
//! Table needs to be a WORD table as your data is greater than a Byte
Table sineTable As Word
0,8,17,26,35,44,53,62,71,80,89,97,106,115,123,132,140,148,157,165,173,181,189,196,204,212,219,226,233,240,247,254,261,267,274,280,286,292,298,303,309,314,319,324,328,333,337,341,344,348,351,354,356,359,361,363,365,366,368,369,370,371,372,372,373,373,373,373,372,372,371,370,369,368,366,365,363,361
End Table