关于STM32F072产生不了PWM

qq4056

1. void TIM2_PWM_Init() //产生pwm
   
2. {
   
3.         GPIO_InitTypeDef GPIO_InitStructure;
   
4.         TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
   
5.         TIM_OCInitTypeDef  TIM_OCInitStructure;
   
6. 
   
7.         float TimerPeriod = 0;
   
8.         uint16_t Channel1Pulse = 0, Channel2Pulse = 0, Channel3Pulse = 0, Channel4Pulse = 0;
   
9.         
   
10.         /* GPIOA Clocks enable */
    
11.         RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA, ENABLE);
    
12.         
    
13.         /* GPIOA Configuration: Channel 1, 2, 3 and 4 as alternate function push-pull */
    
14.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    
15.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    
16.         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
17.         GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    
18.         GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
    
19.         GPIO_Init(GPIOA, &GPIO_InitStructure);
    
20.         
    
21.         GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_2);
    
22. 
    
23.         
    
24.         /* TIM1 clock enable */
    
25.         RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2 , ENABLE);
    
26.         
    
27.         /* Time Base configuration */
    
28.         TIM_TimeBaseStructure.TIM_Prescaler = 48-1;//预分频值
    
29.         TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    
30.         TIM_TimeBaseStructure.TIM_Period = 500000;  //自动重装载值
    
31.         TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    
32.         TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
    
33.         
    
34.         TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
    
35.         
    
36.         /* Channel 1, 2, 3 and 4 Configuration in PWM mode */
    
37.         TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    
38.         TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    
39.         TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
    
40.         TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;//设置输出极性
    
41.         TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
    
42.         TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
    
43.         TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
    
44.         
    
45.         TIM_OCInitStructure.TIM_Pulse = 100000;  //占空比时间
    
46.         TIM_OC3Init(TIM2, &TIM_OCInitStructure);
    
47. 
    
48.         
    
49.         /* TIM1 counter enable */
    
50.         TIM_Cmd(TIM2, ENABLE);
    
51.         
    
52.         /* TIM1 Main Output Enable */
    
53.         TIM_CtrlPWMOutputs(TIM2, ENABLE);
    
54. 
    
55. }

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我用PA2，定时器TIM2，通道TIM2_CH3，可是也是产生不了pwm.是在是不知道哪出问题

qq4056

问题解决了，预分频系数和占空比的时间设置不正确，给的数值均超出了uint32_t的最大值。

正点原子

帮顶

Ernest2000

有没有其他暂用

qq4056

Ernest2000 发表于 2019-6-28 10:00
有没有其他暂用

没有暂用的，在main()函数直接调用

nashui_sx

A2是串口2 是否外设检查占用看看

qq4056

nashui_sx 发表于 2019-6-28 21:27
A2是串口2 是否外设检查占用看看

没有被占用，我换成PB0，定时器3，也不行。

1. void TIM3_PWM_Init() //产生pwm
   
2. {
   
3.         GPIO_InitTypeDef GPIO_InitStructure;
   
4.         TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
   
5.         TIM_OCInitTypeDef  TIM_OCInitStructure;
   
6.        
   
7.         /* GPIOB Clocks enable */
   
8.         RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOB, ENABLE);
   
9.        
   
10.         GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
    
11.         GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
    
12.         GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
13.         GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    
14.         GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
    
15.         GPIO_Init(GPIOB, &GPIO_InitStructure);
    
16.        
    
17.         GPIO_PinAFConfig(GPIOB, GPIO_PinSource0, GPIO_AF_1);
    
18. 
    
19.        
    
20.         /* TIM3 clock enable */
    
21.         RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3 , ENABLE);
    
22.        
    
23.         /* Time Base configuration */
    
24.         TIM_TimeBaseStructure.TIM_Prescaler = 48-1;//预分频值
    
25.         TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
    
26.         TIM_TimeBaseStructure.TIM_Period = 1000000-1;  //自动重装载值
    
27.         TIM_TimeBaseStructure.TIM_ClockDivision = 0;
    
28.         TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;       
    
29.         TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
    
30.        
    
31.         /* Channel 1, 2, 3 and 4 Configuration in PWM mode */
    
32.         TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
    
33.         TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
    
34.         TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
    
35.         TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;//设置输出极性
    
36.         TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
    
37.         TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
    
38.         TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
    
39.        
    
40.         TIM_OCInitStructure.TIM_Pulse = 100000;  //占空比时间
    
41.         TIM_OC3Init(TIM3, &TIM_OCInitStructure);
    
42.        
    
43.         /* TIM1 counter enable */
    
44.         TIM_Cmd(TIM3, ENABLE);
    
45.        
    
46.         /* TIM1 Main Output Enable */
    
47.         TIM_CtrlPWMOutputs(TIM3, ENABLE);
    
48. 
    
49. }

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