本帖最后由 learnxp 于 2013-1-11 22:05 编辑
做BLDC驱动IR2136，按照公式，输出12.5K的PWM，可用示波器看，输出的只有1.25K，少了10倍，这是为什么啊，是不是我哪里没有设置好啊，但我用KEIL模拟的是12.5K，用IC时只有1.25K了
是不是SystemInit有问题啊，我是用SDK 3.5的LIB
希望那个大侠提醒一下啊
下面是code:
#define PWM_PERIOD 0x0B3F //(72000000 / (2 * 12500)) - 1
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
TIM_BDTRInitTypeDef TIM_BDTRInitStructure;
TIM_DeInit(TIM1);
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_CenterAligned3;
TIM_TimeBaseStructure.TIM_Period = PWM_PERIOD;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV2;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 1;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = PWM_PERIOD >> 1;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCNIdleState_Set;
TIM_OC1Init(TIM1,&TIM_OCInitStructure);
TIM_OC2Init(TIM1,&TIM_OCInitStructure);
TIM_OC3Init(TIM1,&TIM_OCInitStructure);
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Disable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
TIM_BDTRInitStructure.TIM_DeadTime = 0;;
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Enable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_Low;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Enable;
TIM_BDTRConfig(TIM1,&TIM_BDTRInitStructure);
TIM_CCPreloadControl(TIM1, ENABLE);
TIM_SelectCOM(TIM1,ENABLE);
TIM_ITConfig(TIM1, TIM_IT_Break | TIM_IT_COM,ENABLE);
TIM_Cmd(TIM1,ENABLE);
TIM_CtrlPWMOutputs(TIM1,ENABLE);
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