標題: 快速PWM模式 [打印本頁]

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作者: liuqq    時間: 2015-5-21 23:50
標題: 快速PWM模式

1. 
   
2. 
   
3. #include <iom128v.h>
   
4. 
   
5. void main(void)
   
6. 
   
7. {
   
8. 
   
9. // Port B initialization, PB.5-PB.7輸出PWM
   
10. 
    
11. // Func7=Out Func6=Out Func5=Out Func4=Out Func3=Out Func2=Out Func1=Out Func0=Out
    
12. 
    
13. PORTB=0xFF;
    
14. 
    
15. DDRB=0xFF;
    
16. 
    
17. // Timer/Counter 1 initialization
    
18. 
    
19. // Clock source: System Clock
    
20. 
    
21. // Clock value: Timer 1 Stopped
    
22. 
    
23. // Mode: 相位修正PWM, top=ICR1, PWM頻率50Hz，外部晶振16M
    
24. 
    
25. // OC1A output: Non-Inv.
    
26. 
    
27. // OC1B output: Non-Inv.
    
28. 
    
29. // OC1C output: Non-Inv.
    
30. 
    
31. // Noise Canceler: Off
    
32. 
    
33. // Input Capture on Falling Edge
    
34. 
    
35. // Timer 1 Overflow Interrupt: OFF
    
36. 
    
37. // Input Capture Interrupt: Off
    
38. 
    
39. // Compare A Match Interrupt: OFF
    
40. 
    
41. // Compare B Match Interrupt: OFF
    
42. 
    
43. // Compare C Match Interrupt: OFF
    
44. 
    
45. TCCR1A=0xAA;    //普通PWM
    
46. 
    
47. TCCR1B=0x10;
    
48. 
    
49. //TOP1=FOSC/FPWM/2/64;       //64分頻
    
50. 
    
51. //ICR1H=TOP1>>8; ICR1L=TOP1&0xFF;
    
52. 
    
53. ICR1H=0x09; ICR1L=0xf6;     //TOP,64分頻 49Hz PWM, TOP=2550
    
54. 
    
55. OCR1AH=0x09;OCR1AL=0xC4;    //100%
    
56. 
    
57. OCR1BH=0x04;OCR1BL=0xE2;    //50%
    
58. 
    
59. OCR1CH=0x00;OCR1CL=0xFA;   //10%
    
60. 
    
61. TCCR1B|=0x03;   //啟動T1，64分頻
    
62. 
    
63. while(1);
    
64. 
    
65. }
    

復制代碼

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