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- 349
- 金钱
- 349
- 注册时间
- 2020-5-16
- 在线时间
- 52 小时
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10金钱
源代码:
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM3_TimeBaseStructure;
TIM_OCInitTypeDef TIM3_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
TIM3_TimeBaseStructure.TIM_Prescaler =1;
TIM3_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM3_TimeBaseStructure.TIM_Period =PWM_MAX_VALUE-1;
TIM3_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM3_TimeBaseStructure.TIM_RepetitionCounter = 0x0;
TIM_TimeBaseInit(TIM3,&TIM3_TimeBaseStructure);
TIM3_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM3_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM3_OCInitStructure.TIM_Pulse = 0;
TIM3_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OC4Init(TIM3, &TIM3_OCInitStructure);
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE);
TIM_Cmd(TIM3,ENABLE);
修改后频率后:
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM3_TimeBaseStructure;
TIM_OCInitTypeDef TIM3_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
TIM3_TimeBaseStructure.TIM_Prescaler =4; //仅修改分频系数
TIM3_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM3_TimeBaseStructure.TIM_Period =PWM_MAX_VALUE-1;
TIM3_TimeBaseStructure.TIM_ClockDivision = 0x0;
TIM3_TimeBaseStructure.TIM_RepetitionCounter = 0x0;
TIM_TimeBaseInit(TIM3,&TIM3_TimeBaseStructure);
TIM3_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM3_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM3_OCInitStructure.TIM_Pulse = 0;
TIM3_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OC4Init(TIM3, &TIM3_OCInitStructure);
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE);
TIM_Cmd(TIM3,ENABLE);
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