void init_pwm(uint16_t arr, uint16_t psc)
{
GPIO_InitTypeDef GPIO_InitStructure;//PB0 -> TIM3
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;//
TIM_OCInitTypeDef TIM_OCInitStructure;//
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;// 改成PB5不输出
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//¸
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//
GPIO_Init(GPIOB, &GPIO_InitStructure); //
TIM_TimeBaseStructure.TIM_Period = arr;//
TIM_TimeBaseStructure.TIM_Prescaler = psc;//
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;//
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;//
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;//
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; //
TIM_OC3Init(TIM3, &TIM_OCInitStructure);//TIM_OC3 ͨµÀ3//改成PB5的同时改成TIM_OC2Init（）
TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);//改成PB5的同时改成TIM_OC3PreloadConfig（）
TIM_Cmd(TIM3, ENABLE);//
}
这个配置在PB0(TIM3_CH3)时输出正常，改成PB5(TIM3_CH2)时不输出。不知哪里出错了。。。
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