本帖最后由 小盼abc 于 2016-3-1 08:41 编辑
void GPIO_configration(void) //配置PA.0为比较输出通道1
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//配置PA.0位比较输出模式
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void TIM2OC1_Init(void)
{
// NVIC_InitTypeDef NVIC_InitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
// NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); // 分组2
//
// NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
// NVIC_Init(&NVIC_InitStructure);
//最小单元配置
TIM2->ARR = 1200; //计数的事件为0.5s
TIM2->PSC = 1199; //60KHz
TIM2->CNT = 0X00;
TIM2->CR2 = 0X00;
TIM2->SMCR = 0X00;
TIM2->DIER = 0X00; //允许比较中断1
TIM2->CCMR1 = 6<<4; //输出比较1预装载使能
TIM2->CCMR1|=1<<3;
TIM2->CCER = 0X01; //输出高电平有效 且 开启OC1输出到相应引脚
TIM2->CR1 = 0X81;
TIM2->CCR2 = 240; //占空比为20%
}
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