///////////////////////////////****4路*PWM 輸出****////////////////////////////
TIM_TimeBaseInitStruct.TIM_Prescaler = 179; // 10/2MHZ=5us
TIM_TimeBaseInitStruct.TIM_Prescaler = 179; // 10/2MHZ=5us
TIM_TimeBaseInitStruct.TIM_Period = 1999;//10ms
TIM_TimeBaseInitStruct.TIM_ClockDivision = 0;
TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseInitStruct);
/********以下 4路PWM設置共有**********/
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;//輸出模式
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;//高優先級
/****PWM1*****/
TIM_OCInitStructure.TIM_Pulse = TIM3_CCR1_PWM1;//占空比分子1，即計數器計數到TIM3_CCR1_PWM1 發生跳變
TIM_OC1Init(TIM3, &TIM_OCInitStructure); //初始化
TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);//預重載使能
/****PWM2*****/
TIM_OCInitStructure.TIM_Pulse = TIM3_CCR1_PWM2; //占空比分子2，即計數器計數到TIM3_CCR1_PWM2 發生跳變
TIM_OC2Init(TIM3, &TIM_OCInitStructure);
TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);
/****PWM3*****/
TIM_OCInitStructure.TIM_Pulse = TIM3_CCR1_PWM3;//占空比分子3，即計數器計數到TIM3_CCR1_PWM3 發生跳變
TIM_OC3Init(TIM3, &TIM_OCInitStructure);
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);
/****PWM4*****/
TIM_OCInitStructure.TIM_Pulse = TIM3_CCR1_PWM4;//占空比分子4，即計數器計數到TIM3_CCR1_PWM4 發生跳變
TIM_OC4Init(TIM3, &TIM_OCInitStructure);
TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM3, ENABLE);//此句最好寫上 防止意外發生，默認自動裝載
TIM_Cmd(TIM3, ENABLE);
若需要調節占空比 則調用以下函數
TIM_SetCompare1(TIM3, TIM3_CCR1_PWM1);//PWM1,調節占空比
TIM_SetCompare2(TIM3, TIM3_CCR1_PWM2);//PWM1,調節占空比
TIM_SetCompare3(TIM3, TIM3_CCR1_PWM3);//PWM1,調節占空比
TIM_SetCompare4(TIM3, TIM3_CCR1_PWM4);//PWM1,調節占空比
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