[moved] creating 50hz PWM using PIC16f877 on ccs c for Thyristor Firing

Code dot - [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
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
#include <main_timer0.h>
 
#define PWM_TIMER    20480     // duty cycle 
#define PWM_OUT      PIN_C1
#define PWM_OUT1     PIN_C2
#define  Up    PIN_A5
#define  Down  PIN_A4
#define  max   PIN_A3
#define  off   PIN_A2
 
 
int1  pwm_so ;
int16 pwm_tm ;
#INT_EXT
void  EXT_isr()
{
clear_interrupt(INT_EXT);
}
 
 
 
#INT_TIMER1
void wave_timer() {
{
clear_interrupt(INT_TIMER1);
 
if (pwm_so) {
      // OFF 
      output_high(PWM_OUT); 
      output_high(PWM_OUT1); 
      
      set_timer1(56536-pwm_tm);
   }
   else { 
      // ON 
      output_low(PWM_OUT); 
      output_low(PWM_OUT1);
      set_timer1(56536-pwm_tm); 
   } 
   pwm_so = ~pwm_so; 
} 
 
}
 
 
void main()
{  setup_timer_1(T1_INTERNAL|T1_DIV_BY_1);   // setup interrupts
   enable_interrupts(INT_TIMER1);
   enable_interrupts(GLOBAL);  
   enable_interrupts(INT_EXT);
   ext_int_edge(H_TO_L);
   
   
  pwm_tm=4000;//24536-19hz //4536-100hz
  
   while(TRUE)
   {
 
{   
   if(!input(Up))
  {
   pwm_tm+=1000;
  output_d(0X02);
           }
else if(!input(down))
  {
     pwm_tm-=1000;
     output_d(0X04);
     }
else if(!input(max))
  {
     pwm_tm=0;
     output_d(0X06);
     }
else if(!input(off))
  {
     pwm_tm=4000;
     output_d(0X08);
     }
 
 delay_ms(500); // 0.5 second delay to release the selected button
 
  
  }while(input(up) && input(down)  && input(max)  && input(off));
 
  }
   
   }