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void TIM4_PWM_Init(u32 arr,u32 psc)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4,ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; //GPIOB6
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; ­
GPIO_Init(GPIOB,&GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource6,GPIO_AF_TIM4);
TIM_TimeBaseStructure.TIM_Prescaler=psc
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up
TIM_TimeBaseStructure.TIM_Period=arr;
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_RepetitionCounter=0;
TIM_TimeBaseInit(TIM4,&TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode=TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OCPolarity=TIM_OCPolarity_High;
TIM_OCInitStructure.TIM_OutputState=TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse=50;
TIM_OC1Init(TIM4,&TIM_OCInitStructure);
TIM_OC1PreloadConfig(TIM4,TIM_OCPreload_Enable);
TIM_ARRPreloadConfig(TIM4,ENABLE)
TIM_Cmd(TIM4,ENABLE);
}
int main(void)
{
delay_init(168);
uart_init(115200)
TIM4_PWM_Init(2000-1,840-1);
while(1)
{
delay_ms(500);
TIM_SetCompare1(TIM4,250);
delay_ms(500);
TIM_SetCompare1(TIM4,200);
delay_ms(500);
TIM_SetCompare1(TIM4,150);
delay_ms(500);
TIM_SetCompare1(TIM4,100);
delay_ms(500);
TIM_SetCompare1(TIM4,50);
}
}
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