6 HPWM signal generation with PIC18F4431

[pxidr84]

Okay, the code is now capable to calculate 3 sine waves (one for each phase).

I can modify the frequency (by increasing or decreasing freqdiv), but I've difficulties to set a phase angle (0-120-240° for U, V and W respectively) and I've difficulties to set a sinus amplitude (for exemple, if I want a 0-50% dutycycle, I will write uduty=uduty*0.5, but PBP does not support float maths).

Thanks for your help. I use Darrel Taylor's interrupt system for sine-wave generation loop.

'PIC initialization
DEFINE LOADER_USED 1
DEFINE OSC 40      


'DT interrupt system include
INCLUDE "DT_INTS-18.bas"     ' Base Interrupt System
INCLUDE "ReEnterPBP-18.bas"  ' Include if using PBP interrupts


'PWM calculation variables
uduty VAR WORD     'U phase duty
vduty VAR WORD     'V phase duty
wduty VAR WORD     'W phase duty
t VAR byte         'Incremental value


'Inverter U/F variables
freqdiv var WORD   'Frequency diviser
FREQdiv=0          'Range : 0-65535


'Port registers configuration
PORTB=%0          ' Clear ports
TRISB=%11000000   ' PWM 0,1,2,3,4,5 outputs

                            
'PCPWM registers configuration
DTCON=%110        ' Deadtime (600ns)
PTCON0=%100       ' 1:1 postscale, Fosc/4 1:1 prescale, free running mode
PTCON1=%10000000  ' PWM time base is ON, counts up, 19.45kHz/4
PTPERL=%0         ' PWM low-side
PTPERH=%1         ' PWM high-side

	
'PWM registers configuration
PWMCON0=%1000000  'PWM 0,1,2,3,4,5 set in pair mode
PWMCON1=%1        'PWM timer sync configuration


'Interrupt processor
ASM
INT_LIST  macro    ; IntSource, Label, Type, ResetFlag
        INT_Handler   TMR1_INT,  _pwmint,   PBP,  yes
    endm
    INT_CREATE     ; Creates the interrupt processor
ENDASM


'Timer configuration
T1CON=%10000001            ; Prescaler = 1:1, TMR1ON, 16-bit counter
@ INT_ENABLE  TMR1_INT     ; Enable Timer 1 interrupts


'Main loop
mainlp:

    pause 1000

goto mainlp

'PWM calculation and update interrupt
pwmint:
t=0
    
    for T=0 to 255 step 1

    'Frequency diviser
    pauseus freqdiv

    'PWM U phase calculation
    uduty=((sin(t)+128)*4)  
      
    'PWM V phase calculation
    vduty=((sin(t)+128)*4)
    
    'PWM W phase calculation
    wduty=((sin(t)+128)*4)

    'PWM U phase update
    PDC0L=uduty.LOWbyte
    PDC0H=Uduty.HIGHByte

    'PWM V phase update
    PDC1L=vduty.LOWbyte
    PDC1H=vduty.HIGHByte

    'PWM W phase update
    PDC2L=wduty.LOWbyte
    PDC2H=wduty.HIGHByte

    next t

@ INT_RETURN