调试过程中因为疏忽了一个位的操作，导致无输出，一番检查后发现MOE位必须要使能，否则，无波形输出.使能BDTR的MOE位后，波形正常输出，总体操作还是比较简单的，除了MOE没有使能外，其他寄存器的配置很顺利。
该模块优点是操作简单，可互补输出，插入死区，通道极性可修改，灵活关闭通道，
缺点是当通道被关闭后，无法修改被关闭通道的电平，只能是默认的低电平，这里还不够灵活。
void TIM1_pwm_init(void)
{
//pin mux
RCC->AHBENR |= RCC_AHBENR_GPIOB; //enable GPIOB clock
//B14->TIM1_CH1
GPIOB->CRH &= ~(GPIO_CNF_MODE_MASK << GPIO_CRH_CNF_MODE_14_Pos);
GPIOB->CRH |= GPIO_CNF_MODE_AF_PP<< GPIO_CRH_CNF_MODE_14_Pos;
GPIOB->AFRH &= ~GPIO_AFRH_AFR14;
GPIOB->AFRH |= (GPIO_AF_MODE7 << GPIO_AFRH_AFR14_Pos);
//B13->TIM1_CH1N
GPIOB->CRH &= ~(GPIO_CNF_MODE_MASK << GPIO_CRH_CNF_MODE_13_Pos);
GPIOB->CRH |= GPIO_CNF_MODE_AF_PP<< GPIO_CRH_CNF_MODE_13_Pos;
GPIOB->AFRH &= ~GPIO_AFRH_AFR13;
GPIOB->AFRH |= (GPIO_AF_MODE2 << GPIO_AFRH_AFR13_Pos);
//init timer1
RCC->APB2ENR |= RCC_APB2ENR_TIM1;//enable clock
TIM1->PSC = 71;// 71+1
TIM1->ARR = 50;// 50us
TIM1->DIER |= TIM_DIER_UIEN;//enable update interrupt
TIM1->CCR1 = 25;//duty
//oc1 configure
TIM1->CCMR1 &= ~TIM_CCMR1_CC1S;//output
TIM1->CCMR1 |= TIM_CCMR1_OC1FE;
TIM1->CCMR1 |= TIM_CCMR1_OC1PE;
TIM1->CCMR1 |= TIM_CCMR1_OC1M_PWM1;
//output control
TIM1->CCER |= TIM_CCER_CC1EN;
TIM1->CCER &= ~TIM_CCER_CC1P;
TIM1->CCER |= TIM_CCER_CC1NEN;
TIM1->CCER &= ~TIM_CCER_CC1NP;
//TIM1->CCER |= TIM_CCER_CC1NP;
//set dead time
TIM1->CR1 |= TIM_CR1_CKD_DIV4;
TIM1->BDTR |= 36;// 2us
TIM3->CR1 |= TIM_CR1_ARPE; //ARPEenable
TIM1->CR1 |= TIM_CR1_CEN;//counter enable
TIM1->BDTR |= TIM_BDTR_MOEN;//主输出使能
NVIC_SetPriority(TIM1_BRK_UP_TRG_COM_IRQn,1);
NVIC_EnableIRQ(TIM1_BRK_UP_TRG_COM_IRQn);
}
void TIM1_BRK_UP_TRG_COM_IRQHandler(void)
{
if(TIM1->SR & TIM_SR_UIF)
{
TIM1->SR &= ~TIM_SR_UIF;
LED1_TOGGLE;
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