STM32中2个初始化函数都设置了GPIO输出模式，以哪个为准
void led_init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_GPIOD,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA,&GPIO_InitStructure);
GPIO_SetBits(GPIOA,GPIO_Pin_8);
}
void pwm_Init(u16 arr,u16 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_OCInitTypeDef TIM_OCInStruct;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInStruct;
/复用时钟使能/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
/GPIO复用输出配置/
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //推挽复用；
GPIO_Init(GPIOA,&GPIO_InitStructure);
/占空比比较器配置/
TIM_OCInStruct.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInStruct.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInStruct.TIM_Pulse = 0;
TIM_OCInStruct.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM1,&TIM_OCInStruct);
/定时器1时基单元配置/
TIM_TimeBaseInStruct.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInStruct.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInStruct.TIM_Period = arr;
TIM_TimeBaseInStruct.TIM_Prescaler = psc;
TIM_TimeBaseInit(TIM1,&TIM_TimeBaseInStruct);
TIM_OC1PreloadConfig(TIM1,TIM_OCPreload_Enable);
TIM_Cmd(TIM1,ENABLE);
}
int main(void)
{
u16 ledpwmccr1=0;
u8 temp=1;
led_init();
delay_init();
pwm_Init(899,0);
while(1)；
}
