由于之前是使用PB9、PB7引脚即TIM4_ch3\TIM4_ch4，由于项目更改为c8t6的PB、PB7引脚（TIM4_ch3\TIM4_ch4） 改为配置后发现只有一边的轮子可以转到，明明配置没什么问题，编译也没有报错，最后将pwm的调制模式更改才可以， 一个改为TIM_OCMode_PWM2、另一个改TIM_OCMode_PWM1，发现电机转动了。……………^_^大无语事件，知道的大神可以告诉我原因。

void TB6612_PWM_Init(u32 arr, int psc)
{TIM_OCInitTypeDef TIM_OCInitSructure;TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;GPIO_InitTypeDef    GPIO_InitStructure;//配置pwm输出端口RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_6| GPIO_Pin_7;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;		         // 复用推挽输出GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, &GPIO_InitStructure);//初始化定时器RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);TIM_TimeBaseStructure.TIM_Period = arr-1;                   //自动重新装载寄存器周期的值澹ㄥ计数值澹)TIM_TimeBaseStructure.TIM_Prescaler = psc-1;                  //时钟分频系数TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;     //对外部时钟进行采样的时钟分频TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure);              //参数初始化TIM_ClearFlag(TIM4, TIM_FLAG_Update);TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);//设置通道2 pwm参数TIM_OCInitSructure.TIM_OCMode = TIM_OCMode_PWM2;TIM_OCInitSructure.TIM_OutputState= TIM_OutputState_Enable;TIM_OCInitSructure.TIM_Pulse = 0;                            //占空比=TIM_OCInitSructure.TIM_OCPolarity = TIM_OCPolarity_High;     //当定时器计数值小于CCR1_Val时为高电平TIM_OC1Init(TIM4, &TIM_OCInitSructure);                      //参数初始化TIM_OC1PolarityConfig(TIM4, TIM_OCPreload_Enable);           //开始输出pwm//设置通道4 pwm参数TIM_OCInitSructure.TIM_OCMode = TIM_OCMode_PWM1;TIM_OCInitSructure.TIM_OutputState= TIM_OutputState_Enable;TIM_OCInitSructure.TIM_Pulse = 0;                            //占空比= TIM_OCInitSructure.TIM_OCPolarity = TIM_OCPolarity_High;     //当定时器计数值小于CCR1_Val时为高电平TIM_OC2Init(TIM4, &TIM_OCInitSructure);                      //参数初始化TIM_OC2PolarityConfig(TIM4, TIM_OCPreload_Enable);           //开始输出pwmTIM_ARRPreloadConfig(TIM4, ENABLE);                          //启动自动重装TIM_Cmd(TIM4, ENABLE);                                       //启动定时	
}

附一下电机接口说明图：