设置PA7 作为 PWM输出
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1. void TIM_IO_Config(void)
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2. {
   
3. GPIO_InitTypeDef GPIO_InitStructure;
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4. 
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5. RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
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6. 
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7. GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;//
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8. GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
   
9. GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
   
10. GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
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11. GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
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12. GPIO_Init(GPIOA, &GPIO_InitStructure);
    
13. GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_2);
    
14. }
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15. 设置Timer1 为PWM模式，使能，使能PWM输出
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16. void TIM_PWM_Config(void)
    
17. {
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18. /¼ÆËãÔ¤¶¨±íµÄÖµ£¬Ò²¾ÍÊǶàÉÙ¸öʱÖÓ¼ÆÊýΪһ¸öÖÜÆÚ/
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19. TimerPeriod = (SystemCoreClock / 17570 ) - 1;
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20. /¼ÆËãCCR1 Ìøתֵ ÔÚÕ¼¿Õ±ÈΪ50%ʱ/
    
21. Channel1Pulse = (uint16_t) (((uint32_t) 5 * (TimerPeriod - 1)) / 10);
    
22. /* TIM1 ʱÖÓʹÄÜ /
    
23. RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1 , ENABLE);
    
24. / Time ¶¨Ê±»ù´¡ÉèÖÃ*/
    
25. TIM_TimeBaseStructure.TIM_Prescaler = 0;
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26. TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; /* Time ¶¨Ê±ÉèÖÃΪÉÏÉýÑؼÆËãģʽ*/
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27. TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
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28. TIM_TimeBaseStructure.TIM_ClockDivision = 0;
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29. TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
    
30. 
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31. TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
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32. /* ƵµÀ1£¬2£¬3£¬4µÄPWM ģʽÉèÖà */
    
33. TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
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34. TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    
35. TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
    
36. TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
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37. TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
    
38. TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
    
39. TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
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40. 
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41. TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;//ʹÄÜƵµÀ1ÅäÖÃ
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42. TIM_OC1Init(TIM1, &TIM_OCInitStructure);
    
43. 
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44. /* TIM1 ¼ÆËãÆ÷ʹÄÜ*/
    
45. TIM_Cmd(TIM1, ENABLE);
    
46. 
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47. /* TIM1 Ö÷Êä³öʹÄÜ */
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48. TIM_CtrlPWMOutputs(TIM1, ENABLE);
    
49. }

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