hi,
i've noted that my code produce inverted sine waveform and it is not the one i intend to produce,here is my complete code:
Code:
define OSC 20

;*****************VARIABLE DECLARATION******************************************
wsave   VAR BYTE    $70     SYSTEM      ' alternate save location for W 
wsave1  VAR BYTE    $A0     SYSTEM      ' location for W if in bank1
wsave2  VAR BYTE    $120    SYSTEM      ' location for W if in bank2
wsave3  VAR BYTE    $1A0    SYSTEM      ' location for W if in bank3
STEPCOUNT var byte                      'Define stepcount as byte type variable
stepcount = 0

;**************SETTING THE REGISTERS WITH APPROPIATE BIT DEFINITION************* 
ADCON0 = %00000000
ADCON1 = %00000000  ;all anolog output
trisb = %11111111   ;define porta as input
trisc = %11111011   ;make ccp1/portc.2 an output pin
trisa = %11111111   ;define porta as input
TMR2 = 16
PR2 = 78          ;set for 16Khz HPWM(=32 steps*10 times*50hz)        
CCP1CON = %000001100       ;set to pwm mode
T2CON=%00000100           ;enable timer2 and set timer2 prescaler value of 1:1

;****************A sine lookup table in an array********************************
sineval var byte[32]
sineval[0] = 148
sineval[1] = 167
sineval[2] = 185
sineval[3] = 200
sineval[4] = 210
sineval[5] = 222
sineval[6] = 228
sineval[7] = 230
sineval[8] = 228
sineval[9] = 222
sineval[10] = 212
sineval[11] = 200
sineval[12] = 185
sineval[13] = 167
sineval[14] = 148
sineval[15] = 128
sineval[16] = 108
sineval[17] = 89
sineval[18] = 71
sineval[19] = 56
sineval[20] = 43
sineval[21] = 34
sineval[22] = 28
sineval[23] = 26
sineval[24] = 28
sineval[25] = 34
sineval[26] = 43
sineval[27] = 56
sineval[28] = 71
sineval[29] = 89
sineval[30] = 108
sineval[31] = 128

 
timerone var word 
Temp VAR byte 
INCLUDE "DT_INTS-14.bas"     ; Base Interrupt System

;********Define INT_Handler as ISR********************************************** 
ASM           
INT_LIST  macro    ; IntSource,        Label,  Type, ResetFlag?
        INT_Handler   TMR1_INT,   _sine,   ASM,  yes
    endm
    INT_CREATE               ; Creates the interrupt processor
ENDASM

T1CON = %000001    ; Prescaler = 1, TMR1ON          
TMR1L = 255    
TMR1H = 254
@   INT_ENABLE  TMR1_INT     ; Enable Timer 1 Interrupts  
timerone = 62411           ;gives about 50 hz sine 
Main:
        pause 5
        
GOTO Main
 
'---[TMR1_INT - interrupt handler]------------------------------------------


sine:
    TMR1L = timerone.byte0
    TMR1H = timerone.byte1
    Temp = SineVal[StepCount]   
    CCP1CON.4 = Temp.0   'Bit 0
    CCP1CON.5 = Temp.1   'Bit 
    CCPR1L = Temp >> 2     'Bit 2-7
    stepcount = stepcount +1
    if stepcount = 32 then stepcount = 0    
@    INT_RETURN
any idea on how to invert the wave form...?thanx in advance