中间有一个方波比起的小
- //默认 33HZ
- //配置成PWM输出
- void TIM1_Mode_Config(void)
- {
- TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;//初始化TIM2的时间基数单位
- TIM_OCInitTypeDef TIM_OCInitStructure;//初始化TIM2的外设
- GPIO_InitTypeDef GPIO_InitStructure;
-
- /*
- 关掉JTAD调式 PA15作为普通IO口
- */
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
- GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE);
- //RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
- //由于PA15是复用的所以要设置一下
- //GPIO_PinRemapConfig(GPIO_FullRemap_TIM2, ENABLE);
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA , ENABLE);
-
- //配置PA15 PWM输出的模式
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 ;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
- GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
- GPIO_Init(GPIOA, &GPIO_InitStructure);
-
- //打开TIM2的时钟
- //RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
- //TIM2的时间基数单位设置(如计数终止值：999,从0开始 ；计数方式：向上计数）
- #if INSIDE_RCC
- TIM_TimeBaseStructure.TIM_Prescaler= (32 - 1); //时钟预分频数,时钟频率=72MHZ/(时钟预分频+1) 之后是4M
- TIM_TimeBaseStructure.TIM_Period=60606-1; //自动重装载寄存器的值/ 33 HZ
- #else
- TIM_TimeBaseStructure.TIM_Prescaler= (36 - 1); //时钟预分频数,时钟频率=72MHZ/(时钟预分频+1) 之后是4M
- TIM_TimeBaseStructure.TIM_Period=60606-1; //自动重装载寄存器的值/ 33 HZ
- #endif
-
- TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1 ;
- TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
- TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
-
- //TIM2的外设的设置
- TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; //TIM脉冲宽度调制模式1
- TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;// 正常的输出
- TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Disable; //互补的那一路不输出
- TIM_OCInitStructure.TIM_Pulse = 60606/2;//设置了待装入捕获比较寄存器的脉冲值
- TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low; //TIM输出比较极性高
- TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCPolarity_Low; //TIM输出比较极性高
- //和死区有关只有TIM8 TIM1有关
- TIM_OCInitStructure.TIM_OCIdleState= TIM_OCIdleState_Reset;
- TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Reset;
- TIM_OC4Init(TIM1, &TIM_OCInitStructure);
-
- TIM_OC4PreloadConfig(TIM1, TIM_OCPreload_Enable);//使能或者失能TIMx在CCR1上的预装载寄存器
- TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIM2重载寄存器ARR
- TIM_CtrlPWMOutputs(TIM1, ENABLE); //对于高级定时器来说，要有这句TIM_CtrlPWMOutputs(TIM1, ENABLE);使能PWM输出。
- TIM_ClearFlag(TIM1, TIM_FLAG_Update); //清除溢出中断标志
-
- TIM_Cmd(TIM1, ENABLE);//使能TIM2
-
-
-
- }
- //其中 60606 为 33HZ 15037=155HZ
- void SetComp_Speed(u16 speed)
- {
- u16 Frep;
- if((speed>=33)&&(speed<=150))
- {
- //TIM_PSCReloadMode_Update 不立即产生一个新的事件等待新的周期
- //TIM_PSCReloadMode_Immediate 立即产生一个事件并且跟新计数数据
- TIM_PrescalerConfig(TIM1,(32-1),TIM_PSCReloadMode_Update);// 修改分频系数
- Frep=2000000/speed;
- TIM_SetAutoreload(TIM1, Frep);
- TIM_SetCompare4(TIM1,Frep/2);
- }else if((speed>0)&&(speed<33))
- {
- TIM_PrescalerConfig(TIM1,(6400-1),TIM_PSCReloadMode_Update);// 修改分频系数
- Frep=10000/speed;
- TIM_SetAutoreload(TIM1, Frep);
- TIM_SetCompare4(TIM1,Frep/2);
- }else if(speed>150)
- {
- TIM_PrescalerConfig(TIM1,(32-1),TIM_PSCReloadMode_Update);// 修改分频系数
- TIM_SetAutoreload(TIM1, 13333);
- TIM_SetCompare4(TIM1,13333/2);
- }else
- {
- TIM_PrescalerConfig(TIM1,(32-1),TIM_PSCReloadMode_Update);// 修改分频系数
- TIM_SetAutoreload(TIM1, 13333);
- TIM_SetCompare4(TIM1,23333); // 占空比要大于重载值才能没有毛刺
- }
-
- }
各位有人遇到过吗
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