pwm问题：如果我用定时器实现pwm输出，我要吧TIM1_ch1改成TIM1_CH2，应该修改那个地方？

尘世入门

HXYDJ

1. void TIM1_PWM_Init(u16 arr, u16 psc)
   
2. {
   
3.     GPIO_InitTypeDef GPIO_InitStructure;
   
4.     TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
   
5.     TIM_OCInitTypeDef TIM_OCInitSturcture;
   
6. 
   
7.     RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_TIM1, ENABLE);
   
8.     //初始化IO口
   
9.     GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11;
   
10.     GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    
11.     GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    
12.     GPIO_Init(GPIOA, &GPIO_InitStructure);
    
13. 
    
14.     //设置 TIM ARR PSC
    
15.     TIM_TimeBaseInitStructure.TIM_Period = arr;
    
16.     TIM_TimeBaseInitStructure.TIM_Prescaler = psc;
    
17.     TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;
    
18.     TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up;                //向上计数模式
    
19.     TIM_TimeBaseInitStructure.TIM_RepetitionCounter = 0x00;
    
20.     TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStructure);
    
21. 
    
22.     //TIM1_CH1  PWM1 模式
    
23.     TIM_OCInitSturcture.TIM_OCMode = TIM_OCMode_PWM1;
    
24.     TIM_OCInitSturcture.TIM_OutputState = TIM_OutputState_Enable;
    
25.     TIM_OCInitSturcture.TIM_OCPolarity = TIM_OCPolarity_High;                        //输出高电平有效
    
26.     TIM_OC1Init(TIM1, &TIM_OCInitSturcture);
    
27. 
    
28.     //TIM1_CH2  PWM1 模式
    
29.     TIM_OCInitSturcture.TIM_OCMode = TIM_OCMode_PWM1;
    
30.     TIM_OCInitSturcture.TIM_OutputState = TIM_OutputState_Enable;
    
31.     TIM_OCInitSturcture.TIM_OCPolarity = TIM_OCPolarity_Low;                 //输出低电平有效
    
32.     TIM_OC2Init(TIM1, &TIM_OCInitSturcture);
    
33. 
    
34. 
    
35.     //TIM1_CH3  PWM2 模式
    
36.     TIM_OCInitSturcture.TIM_OCMode = TIM_OCMode_PWM2;
    
37.     TIM_OCInitSturcture.TIM_OutputState = TIM_OutputState_Enable;
    
38.     TIM_OCInitSturcture.TIM_OCPolarity = TIM_OCPolarity_High;                 //输出高电平有效
    
39.     TIM_OC3Init(TIM1, &TIM_OCInitSturcture);
    
40. 
    
41.     //TIM1_CH4  PWM2 模式
    
42.     TIM_OCInitSturcture.TIM_OCMode = TIM_OCMode_PWM2;
    
43.     TIM_OCInitSturcture.TIM_OutputState = TIM_OutputState_Enable;
    
44.     TIM_OCInitSturcture.TIM_OCPolarity = TIM_OCPolarity_Low;                 //输出低电平有效
    
45.     TIM_OC4Init(TIM1, &TIM_OCInitSturcture);
    
46. 
    
47. 
    
48.     TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable);                                        //TIM1_CH1 使能预装载寄存器
    
49.     TIM_OC2PreloadConfig(TIM1, TIM_OCPreload_Enable);                                         //TIM1_CH2 使能预装载寄存器
    
50.     TIM_OC3PreloadConfig(TIM1, TIM_OCPreload_Enable);                                         //TIM1_CH3 使能预装载寄存器
    
51.     TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);                                         //TIM1_CH4 使能预装载寄存器
    
52. 
    
53. 
    
54.     TIM_Cmd(TIM1, ENABLE);                                //使能计数器
    
55.     TIM_CtrlPWMOutputs(TIM1, ENABLE);        //主输出使能
    
56. }

复制代码

尘世入门

HXYDJ 发表于 2019-7-23 15:19

请问
TIM_TimeBaseInitStructure.TIM_RepetitionCounter
是干什么吗用的？

HXYDJ

尘世入门 发表于 2019-7-23 16:38
请问
TIM_TimeBaseInitStructure.TIM_RepetitionCounter
是干什么吗用的？

重复计数寄存器