TIM2 CH1无输出PWM

CCR1的值设置了么？？

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void TIM_PWM_Init(uint16_t arr, uint16_t psc) { GPIO_InitTypeDef  GPIO_InitStructure; TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure; TIM_OCInitTypeDef  TIM_OCInitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);  RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO | RCC_APB2Periph_GPIOB, ENABLE); //开引脚复用AFIO时钟 GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable, ENABLE);//加上了这一句，禁用JTAG，我用的是JTAG下载 GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE);//开TIM3部分重映射 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 |GPIO_Pin_1 | GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 | GPIO_Pin_9; 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_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;   TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;  TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;  TIM_OC1Init(TIM3, &TIM_OCInitStructure);  TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable);  TIM_OC2Init(TIM3, &TIM_OCInitStructure);   TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable);  TIM_OC3Init(TIM3, &TIM_OCInitStructure); TIM_OC3PreloadConfig(TIM3, TIM_OCPreload_Enable);   TIM_OC4Init(TIM3, &TIM_OCInitStructure);  TIM_OC4PreloadConfig(TIM3, TIM_OCPreload_Enable); TIM_OC1Init(TIM4, &TIM_OCInitStructure);  TIM_OC1PreloadConfig(TIM4, TIM_OCPreload_Enable);   TIM_OC2PreloadConfig(TIM4, TIM_OCPreload_Enable); TIM_OC3Init(TIM4, &TIM_OCInitStructure);   TIM_OC3PreloadConfig(TIM4, TIM_OCPreload_Enable);   TIM_OC4Init(TIM4, &TIM_OCInitStructure);  TIM_OC4PreloadConfig(TIM4, TIM_OCPreload_Enable);  TIM_Cmd(TIM3, ENABLE);  TIM_Cmd(TIM4, ENABLE);  } int main(void) { delay_init(); LED_Init(); LED_Open(1); LCD_SPI2_Init(); NVIC_Configuration(); //中断分组 TIM_PWM_Init(19999, 71);//72000000/((19999+1)*(71+1))=50Hz while(1) { TIM_SetCompare1(TIM3,1300);//PB4 TIM_SetCompare2(TIM3,1700);//PB5 TIM_SetCompare3(TIM3,1300);//PB0 TIM_SetCompare4(TIM3,1700);//PB1 TIM_SetCompare1(TIM4,1300);//PB6 TIM_SetCompare2(TIM4,1700);//PB7 TIM_SetCompare3(TIM4,1300);//PB8 TIM_SetCompare4(TIM4,1700);//PB9 LCD_SPI2_P8x16Str(48,6,"OLED"); } }

不要不停的设置。。。。
设置完进入死循环，再测试。