[SOLVED] SPWM for 3 phase inverter using PIC 18F4431 PCPWM module and Timer0 interrupt

Code C - [expand]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
void pwm_init(void)
{
 
PORTB = 0x00; // turn off all PORTB
 
TRISBbits.TRISB0 = 0; // PWM0
TRISBbits.TRISB1 = 0; // PWM1
 
TRISBbits.TRISB2 = 0; // PWM2
TRISBbits.TRISB3 = 0; // PWM3
 
TRISBbits.TRISB5 = 0; // PWM4
TRISBbits.TRISB4 = 0; // PWM5
 
ADCON0=0x00;// ADC module is disabled
 
// PWM Control module enable configuration
 
// PWM timer control register configuration
PTCON0 = 0x02; //PWM timer control register 0 configured in the free running mode, 1:1 postscale,Fosc/4 (1:1 prescale)
PTCON1 = 0x80; // PWM timer control register 1 with PWM time base timer bit enabled
 
//PWM control register configuration
PWMCON0 = 0x40; // PWM0, PWM1, PWM2, PWM3, PWM4 and PWM5 pins are enabled for PWM output
PWMCON1 = 0x00;  
 
// Dead time control register 
DTCON = 0x00;           //  dead time disabled
 
//Output override control register
OVDCOND = 0xFF;     //  Output on PWM I/O pin is controlled by the value in the corresponding POUT bit
 
// Output state register
OVDCONS = 0x00;     //  Output on PWM I/O pin is inactive when the corresponding PWM output override bit is cleared
 
//Fault configuration register
FLTCONFIG = 0x00;   //  disable fault detection feature
 
// PWM time base registers
 PTMRL = 0x7D;          //  PWM time base register (lower 8 bits)
 PTMRH = 0x00;          //  PWM time base register (upper 4 bits)
 
 
//PWM time base period registers are set to get 20kHz PWM frequency
 PTPERL = 0x7D;         //  PWM time base period register (lower 8 bits)
 PTPERH = 0x00;         //  PWM time base period register (upper 4 bits)
 
// PWM special event trigger compare registers
SEVTCMPL = 0x00;
SEVTCMPH = 0x00;
 
// PWM Duty cycle registers 
 
 // Interrupt control register 
//INTCON = 0xC0;        // enable globle and peripheral interrupts
 
//PIE3bits.PTIE = 1;    // enable timer 1 
//PIR3bits.PTIF = 0;    // disable timer 1 flag  
//IPR3bits.PTIP = 1;    // enable timer 1 interrupt priorty high or PWM time base interrupt prority bit
 
}