Tim2设置之后只输出了三组PWM波，通道三没用到，求解

ypc_ly

我用TIM2输出四组PWM波，没有设置重映射，用了默认的PINA0、1、2、3来产生。但是只输出了三组，只有PINA0、1、2有输出，并且分别对应了Tim2的通道1、2、4 。不知道为什么通道三没有用到，而且PINA3也没有输出PWM波。向大神们讨教一下这个是什么原因照成的？我又把TIM2换成了4，结果还是一样，

1. #include "bsp_pwm_output.h"
   
2. #include "stm32f10x_it.h"
   
3. volatile u32 time0=900;
   
4. volatile u32 time1=900;
   
5. volatile u32 time2=900;
   
6. volatile u32 time3=900;
   
7. /**
   
8.   * @brief  ÅäÖÃTIM3¸′óÃêä3öPWMê±óÃμ½μÄI/O
   
9.   * @param  ÎT
   
10.   * @retval ÎT
    
11.   */
    
12. static void TIM2_GPIO_Config(void)
    
13. {
    
14.   GPIO_InitTypeDef GPIO_InitStructure;
    
15. 
    
16.         
    
17.         RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); //open tim2 clock
    
18.         
    
19.   /* GPIOA and GPIOB clock enable */
    
20.   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    
21.         
    
22.         //GPIO_PinRemapConfig(GPIO_PartialRemap1_TIM2, ENABLE);    //重映射
    
23. 
    
24.   /*GPIOA Configuration: TIM2 channel 3 as alternate function push-pull */
    
25.   GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9 ;
    
26.    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
27.   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;                    
    
28. 
    
29.         GPIO_Init(GPIOB, &GPIO_InitStructure);
    
30.   
    
31. 
    
32.   /*GPIOA Configuration: TIM2 channel 2,3 and 15 as alternate function push-pull */
    
33.   
    
34.         
    
35. //        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    
36. //        GPIO_Init(GPIOB, &GPIO_InitStructure);
    
37. }
    
38. 
    
39. 
    
40. static void TIM2_Mode_Config(void)
    
41. {
    
42.         TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
    
43.         TIM_OCInitTypeDef  TIM_OCInitStructure;
    
44. 
    
45.         /* PWMDÅoÅμçƽìø±äÖμ */
    
46.          u16 CCR1_Val = time0;        
    
47.          u16 CCR2_Val = time1;
    
48.          u16 CCR3_Val = time2;
    
49.         u16 CCR4_Val = time3;
    
50. 
    
51. 
    
52.         
    
53. /* -----------------------------------------------------------------------
    
54.     TIM3 Channel1 duty cycle = (TIM2_CCR1/ TIM3_ARR+1)* 100% = 50%
    
55.     TIM3 Channel2 duty cycle = (TIM2_CCR2/ TIM3_ARR+1)* 100% = 37.5%
    
56.     TIM3 Channel3 duty cycle = (TIM2_CCR3/ TIM3_ARR+1)* 100% = 25%
    
57.     TIM3 Channel4 duty cycle = (TIM2_CCR4/ TIM3_ARR+1)* 100% = 12.5%
    
58.   ----------------------------------------------------------------------- */
    
59. 
    
60.   /* Time base configuration */                 
    
61.   TIM_TimeBaseStructure.TIM_Period = 999;       //预装值
    
62.   TIM_TimeBaseStructure.TIM_Prescaler = 0;            //预分频
    
63.   TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;        //设置时钟系数
    
64.   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;  //向上计数
    
65.   TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
    
66. 
    
67.   /* PWM1 Mode configuration: Channel1 */
    
68.   TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;            //选择模式一
    
69.   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;        
    
70.   TIM_OCInitStructure.TIM_Pulse = CCR1_Val;           //跳变值
    
71.   TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  
    
72.   TIM_OC1Init(TIM4, &TIM_OCInitStructure);         //使能通道一
    
73.   TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);
    
74. 
    
75.   /* PWM1 Mode configuration: Channel2 */
    
76. 
    
77.   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    
78.   TIM_OCInitStructure.TIM_Pulse = CCR2_Val;         
    
79.   TIM_OC2Init(TIM4, &TIM_OCInitStructure);         
    
80.   TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable);
    
81. 
    
82. //  /* PWM1 Mode configuration: Channel3 */
    
83. 
    
84.   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    
85.   TIM_OCInitStructure.TIM_Pulse = CCR3_Val;      
    
86.   TIM_OC3Init(TIM4, &TIM_OCInitStructure);        
    
87.   TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);
    
88.         
    
89.          
    
90.         TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    
91.   TIM_OCInitStructure.TIM_Pulse = CCR4_Val;      
    
92.   TIM_OC3Init(TIM4, &TIM_OCInitStructure);        
    
93.   TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);
    
94. 
    
95.   
    
96.   TIM_ARRPreloadConfig(TIM4, ENABLE);                        
    
97.   /* TIM2 enable counter */
    
98.   TIM_Cmd(TIM4, ENABLE);                    
    
99. }
    
100. 
     
101. 
     
102. void TIM2_PWM_Init(void)
     
103. {
     
104.         TIM2_GPIO_Config();
     
105.         TIM2_Mode_Config();        
     
106. }
     
107. void TIM2_2 (void)
     
108. {TIM2_Mode_Config();        }
     

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flyleaf

可能有的引脚在板子的其它芯片占用了