本帖最后由 chb080042 于 2014-7-3 16:34 编辑
请教各位，我在做编码器数据采集时遇到一个问题：
1、TIM1，正交编码数据上溢时有中断，通过CR1->DIR位可以判断为上溢；但是在编码器反转，计数器下溢时，没有中断产生。
2、TIM2没有上述问题，上溢下溢均有中断，通过CR1->DIR可以区分。
代码片段如下：
/*************************定时器配置*********************************/
void TIM_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
/* Timer configuration in Encoder mode */
TIM_TimeBaseStructure.TIM_Prescaler = 0x0; // No prescaling
TIM_TimeBaseStructure.TIM_Period = 65535;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_EncoderInterfaceConfig(TIM1, TIM_EncoderMode_TI12,
TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_ICFilter = 6;//ICx_FILTER;
TIM_ICInit(TIM1, &TIM_ICInitStructure);
// Clear all pending interrupts
TIM_ClearFlag(TIM1, TIM_FLAG_Update);
TIM_ITConfig(TIM1, TIM_IT_Update, ENABLE);
//Reset counter
TIM1->CNT = 0;
TIM_Cmd(TIM1, ENABLE);
/* Timer configuration in Encoder mode */
TIM_TimeBaseStructure.TIM_Prescaler = 0x0; // No prescaling
TIM_TimeBaseStructure.TIM_Period = 65535;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_EncoderInterfaceConfig(TIM2, TIM_EncoderMode_TI12,
TIM_ICPolarity_Rising, TIM_ICPolarity_Rising);
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_ICFilter = 6;//ICx_FILTER;
TIM_ICInit(TIM2, &TIM_ICInitStructure);
// Clear all pending interrupts
TIM_ClearFlag(TIM2, TIM_FLAG_Update);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
//Reset counter
TIM2->CNT = 0;
TIM_Cmd(TIM2, ENABLE);
}
/*************************NVIC配置*********************************/
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
/* Set the Vector Table base location at 0x20000000 */
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else /* VECT_TAB_FLASH */
/* Set the Vector Table base location at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
/* Enable the TIM1 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM1_UP_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the TIM2 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/*************************TIM1中断程序*********************************/
void TIM1_UP_IRQHandler(void)
{
if (TIM_GetITStatus(TIM1, TIM_IT_Update) != RESET)//计数溢出中断
{
if( TIM1->CR1 & 0x0010)//向下计数溢出
{
y_Counter_plus -= 65536;
}
else//向上计数溢出
{
y_Counter_plus += 65536;
}
TIM_ClearFlag(TIM1, TIM_IT_Update);
}
}
/*************************TIM2中断程序*********************************/
void TIM2_IRQHandler(void)//50ms
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)//计数溢出中断
{
if( TIM2->CR1 & 0x0010)//先下计数溢出
{
x_Counter_plus -= 65536;
}
else//向上计数溢出
{
x_Counter_plus += 65536;
}
TIM_ClearFlag(TIM2, TIM_IT_Update);
}
} |
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