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- 2019-7-9
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楼主 |
发表于 2019-8-9 11:43:47
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没有了,只是生成了一个互补的PWM波。
void TIM1_PWM_Init(u16 arr,u16 psc,u16 crr)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStruct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);//
TIM_TimeBaseStructure.TIM_Period = arr; //设置在下一个更新事件装入活动的自动重装载寄存器周期的值 80K
TIM_TimeBaseStructure.TIM_Prescaler =psc; //设置用来作为TIMx时钟频率除数的预分频值 不分频
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2; //选择定时器模式:TIM脉冲宽度调制模式2
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; //比较输出使能
TIM_OCInitStructure.TIM_OutputNState= TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse =crr; //设置待装入捕获比较寄存器的脉冲值 //初始占空比为1/10
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //输出极性:TIM输出比较极性高
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure); //根据TIM_OCInitStruct中指定的参数初始化外设TIMx
TIM_ARRPreloadConfig(TIM1, ENABLE); //使能TIMx在ARR上的预装载寄存器
TIM_CtrlPWMOutputs(TIM1,ENABLE); //MOE 主输出使能
TIM_OC1PreloadConfig(TIM1, TIM_OCPreload_Enable); //CH1预装载使能
TIM_BDTRInitStruct.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStruct.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStruct.TIM_LOCKLevel = TIM_LOCKLevel_1;
//输出比较信号死区时间配置,具体如何设置可参考 BDTR:UTG[7:0]的描述
//这里配置的死区时间为152ns
TIM_BDTRInitStruct.TIM_DeadTime = 11;
TIM_BDTRInitStruct.TIM_Break = TIM_Break_Enable;
//当BKIN引脚检测到高电平的时候,输出比较信号被禁止,就好像刹车一样
TIM_BDTRInitStruct.TIM_BreakPolarity = TIM_BreakPolarity_High;
TIM_BDTRInitStruct.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStruct);
TIM_Cmd(TIM1, ENABLE); //使能TIM1
TIM_CtrlPWMOutputs(TIM1, ENABLE);//主输出使能,当时用的是通用定时器的时候,这句不需要
}
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