我用stm32编码器模式测角度,每次回原点读数都不为0,附上代码,请问是我程序的问题?还是增量式编码器本身就测不了角度?[mw_shl_code=applescript,true]extern u16 count1;
extern u16 count2;
//编码器1初始化,使用定时器3
void coder1_init()
{
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
GPIO_InitTypeDef GPIO_Structure;
GPIO_Structure.GPIO_Mode=GPIO_Mode_AF;
GPIO_Structure.GPIO_OType=GPIO_OType_PP;
GPIO_Structure.GPIO_Pin=GPIO_Pin_4|GPIO_Pin_5;
GPIO_Structure.GPIO_PuPd=GPIO_PuPd_UP;
GPIO_Structure.GPIO_Speed=GPIO_High_Speed;
GPIO_Init(GPIOB,&GPIO_Structure);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource4,GPIO_AF_TIM3);
GPIO_PinAFConfig(GPIOB,GPIO_PinSource5,GPIO_AF_TIM3);
NVIC_InitTypeDef NVIC_Structure;
NVIC_Structure.NVIC_IRQChannel=TIM3_IRQn;
NVIC_Structure.NVIC_IRQChannelCmd=ENABLE;
NVIC_Structure.NVIC_IRQChannelPreemptionPriority=0;
NVIC_Structure.NVIC_IRQChannelSubPriority=0;
NVIC_Init(&NVIC_Structure);
TIM_DeInit(TIM3);
TIM_TimeBaseInitTypeDef TIM3_Structure;
TIM3_Structure.TIM_ClockDivision=TIM_CKD_DIV1;
TIM3_Structure.TIM_CounterMode=TIM_CounterMode_Up;
TIM3_Structure.TIM_Period=399*4;//400线编码器
TIM3_Structure.TIM_Prescaler=0;
TIM_TimeBaseInit(TIM3,&TIM3_Structure);
TIM_EncoderInterfaceConfig(TIM3,TIM_EncoderMode_TI12,TIM_ICPolarity_BothEdge,TIM_ICPolarity_BothEdge);
TIM_ICInitTypeDef IC_Structure;
TIM_ICStructInit(&IC_Structure);
IC_Structure.TIM_ICFilter=6;
TIM_ICInit(TIM3,&IC_Structure);
TIM_ClearFlag(TIM3, TIM_FLAG_Update);
TIM_ITConfig(TIM3, TIM_IT_Update, ENABLE);
TIM3->CNT = 800;//设置一个基数,防止出现负值
TIM_Cmd(TIM3, ENABLE);
}
//定时器中断,读取角度
void TIM1_UP_TIM10_IRQHandler()
{
// if(TIM_GetITStatus(TIM1,TIM_IT_Update)==SET)
count1=TIM3->CNT;
TIM_ClearITPendingBit(TIM1,TIM_IT_Update);
}[/mw_shl_code]
友情提示: 此问题已得到解决,问题已经关闭,关闭后问题禁止继续编辑,回答。
这是有问题的,应该是TIM3_Structure.TIM_Period=400*4-1;//400线编码器
2.你回到零点得初始化为0,也就是你的TIM3->CNT=0。
3.有没有Z信号?有的话可以利用一下,没有就靠TIM3溢出了。
这样就可以了,编码器是可靠的可以测量位置的
单片机捕获脉冲占用CPU资源吗?我总感觉是CPU执行其他程序的时候没有计到编码器脉冲
按你说的还是不行,还是有误差,感觉就是单片机有些脉冲没有计到
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* TIM2 clock source enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* Enable GPIOA, clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_StructInit(&GPIO_InitStructure);
/* Configure PA.00,01 as encoder input */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Enable the TIM2 Update Interrupt */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = NVIC_IRQChannelPreemptionPriority_ENC;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = NVIC_IRQChannelSubPriority_ENC;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Timer configuration in Encoder mode */
TIM_DeInit(ENCODER_TIMER);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Prescaler = 0x0; // No prescaling
TIM_TimeBaseStructure.TIM_Period = (4*ENCODER_PPR)-1;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(ENCODER_TIMER, &TIM_TimeBaseStructure);
TIM_EncoderInterfaceConfig(ENCODER_TIMER, TIM_EncoderMode_TI12,
TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_ICFilter = ICx_FILTER;
TIM_ICInit(ENCODER_TIMER, &TIM_ICInitStructure);
// Clear all pending interrupts
TIM_ClearFlag(ENCODER_TIMER, TIM_FLAG_Update);
TIM_ITConfig(ENCODER_TIMER, TIM_IT_Update, ENABLE);
//Reset counter
TIM2->CNT = COUNTER_RESET;
TIM_Cmd(ENCODER_TIMER, ENABLE);
}
这是我在伺服中的初始化,跟你还是有点差异的。你自己改改咯
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