用定时器3控制输出两路pwm，请问是这样设置的吗？

Lemon · 发表于 2014-12-12 21:34:31

[mw_shl_code=c,true]void TIM3_PWM_Init(u16 arr,u16 psc) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); GPIO_PinRemapConfig(GPIO_PartialRemap_TIM3, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //TIM_CH2 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; GPIO_Init(GPIOB, &GPIO_InitStructure); TIM_TimeBaseStructure.TIM_Period = arr; TIM_TimeBaseStructure.TIM_Prescaler =psc; TIM_TimeBaseStructure.TIM_ClockDivision = 0; 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_OC2Init(TIM3, &TIM_OCInitStructure); TIM_OC1Init(TIM3, &TIM_OCInitStructure); TIM_OC2PreloadConfig(TIM3, TIM_OCPreload_Enable); TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); TIM_Cmd(TIM3, ENABLE); }[/mw_shl_code]

Lemon · 发表于 2014-12-12 22:11:29

int main(void)
{
u16 led0pwmval=0;
u8 dir=1;
delay_init();      //???±??????????
//NVIC_Configuration(); //?è??NVIC????·?×é2:2??????????????2???ì????????
//uart_init(9600); //????????????9600
LED_Init();      //LED??????????
TIM3_PWM_Init(899,0); //??·?????PWM????=72000/900=8Khz
    while(1)
{
delay_ms(10); //?????????§??
if(dir)led0pwmval++;
else led0pwmval--;

if(led0pwmval>300)dir=0;
if(led0pwmval==0)dir=1;
//led0pwmval = 500;
TIM_SetCompare2(TIM3,led0pwmval);
TIM_SetCompare1(TIM3,led0pwmval);
}
}