今天试着通过TIMER1+DMA5向GPIO口传送512个数据，DMA开放了TC,HT 2个中断（传送半中断和传送完成中断），应在传送了256数据和512个数据时产生DMA中断，但实际上是在传送了249和507时就产生了中断。程序如下，望大侠指点
void TIMER1_Configuration(void)
{
/* TIMER1 DMA Transfer example -------------------------------------------------
TIMER1CLK = 72MHz, Prescaler = 72
TIMER1 counter clock = SystemCoreClock/72 = 1MHz.
The objective is to configure TIMER1 channel 1 to generate PWM
signal with a frequency equal to 1KHz and a variable duty cycle(25%,50%,75%) that is
changed by the DMA after a specific number of Update DMA request.
The number of this repetitive requests is defined by the TIMER1 Repetition counter,
each 2 Update Requests, the TIMER1 Channel 1 Duty Cycle changes to the next new
value defined by the buffer .
-----------------------------------------------------------------------------*/
TIMER_BaseInitPara TIMER_TimeBaseStructure;
TIMER_OCInitPara TIMER_OCInitStructure;
DMA_InitPara DMA_InitStructure;
NVIC_InitPara NVIC_InitStructure;
/* TIMERS clock enable */
RCC_APB2PeriphClock_Enable(RCC_APB2PERIPH_TIMER1,ENABLE);
//RCC_APB1PeriphClock_Enable(RCC_APB1PERIPH_TIMER2|RCC_APB1PERIPH_TIMER3|RCC_APB1PERIPH_TIMER6|RCC_APB1PERIPH_TIMER14,ENABLE);
/* TIMER1 configuration */
TIMER_DeInit(TIMER1);
TIMER_TimeBaseStructure.TIMER_Prescaler = 0; //ÉèÖÃÔ¤·ÖƵ
TIMER_TimeBaseStructure.TIMER_Period = Fre;
TIMER_TimeBaseStructure.TIMER_ClockDivision = 0; //ÉèÖÃʱÖÓ·ÖƵϵÊý£º²»·ÖƵ
//TIMER_TimeBaseStructure.TIMER_Pulse = 3;
TIMER_TimeBaseStructure.TIMER_CounterMode = TIMER_COUNTER_UP;
//TIMER_TimeBaseStructure.TIMER_RepetitionCounter = 1;
TIMER_BaseInit(TIMER1,&TIMER_TimeBaseStructure);
/* CH1 Configuration in PWM mode */
TIMER_OCInitStructure.TIMER_OCMode = TIMER_OC_MODE_PWM1;
TIMER_OCInitStructure.TIMER_OCPolarity = TIMER_OC_POLARITY_HIGH;
TIMER_OCInitStructure.TIMER_OCNPolarity = TIMER_OCN_POLARITY_HIGH;
TIMER_OCInitStructure.TIMER_OutputState = TIMER_OUTPUT_STATE_ENABLE;
TIMER_OCInitStructure.TIMER_OutputNState = TIMER_OUTPUTN_STATE_ENABLE;
TIMER_OCInitStructure.TIMER_OCIdleState = TIMER_OC_IDLE_STATE_SET;
TIMER_OCInitStructure.TIMER_OCNIdleState = TIMER_OCN_IDLE_STATE_RESET;
// TIMER_OCInitStructure.TIMER_Pulse = FreDa[0];
// TIMER_OC3_Init(TIMER1, &TIMER_OCInitStructure);
// TIMER_OC3_Preload(TIMER1,TIMER_OC_PRELOAD_DISABLE);
/* TIMER1 output enable */
// TIMER_CtrlPWMOutputs(TIMER1,ENABLE);
/* Auto-reload preload enable */
// TIMER_CARLPreloadConfig(TIMER1,ENABLE);
/* TIMER1 Update DMA Request enable */
TIMER_DMACmd( TIMER1, TIMER_DMA_UPDATE, ENABLE);
/* TIMER enable counter*/
TIMER_Enable( TIMER1, DISABLE );
/* DMA1 clock enable */
RCC_AHBPeriphClock_Enable(RCC_AHBPERIPH_DMA1,ENABLE);
/* DMA1 Channel5 Config */
DMA_DeInit(DMA1_CHANNEL5);
//DMA_InitStructure.DMA_PeripheralBaseAddr = TIMER3_CHCC1;
DMA_InitStructure.DMA_PeripheralBaseAddr = GPIOA_ODR ;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&DDS_Buf;//buf;
DMA_InitStructure.DMA_DIR = DMA_DIR_PERIPHERALDST;
DMA_InitStructure.DMA_BufferSize = 512;
DMA_InitStructure.DMA_PeripheralInc = DMA_PERIPHERALINC_DISABLE;//ÍâÉèµØÖ·¹Ì¶¨
DMA_InitStructure.DMA_MemoryInc = DMA_MEMORYINC_ENABLE;//ÄÚ´æµØÖ·¹Ì¶¨
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PERIPHERALDATASIZE_HALFWORD;//ÍâÉèÊý¾Ý¿í¶ÈΪ16λ
DMA_InitStructure.DMA_MemoryDataSize = DMA_MEMORYDATASIZE_HALFWORD;//»º´æÊý¾Ý¿í¶È
DMA_InitStructure.DMA_Mode = DMA_MODE_CIRCULAR;//Ñ»·´«Êä
DMA_InitStructure.DMA_Priority = DMA_PRIORITY_HIGH;//ÓÅÏȼ¶
DMA_InitStructure.DMA_MTOM = DMA_MEMTOMEM_DISABLE;//δÉè³ÉÄÚ´æµ½ÄÚ´æģʽ
DMA_Init(DMA1_CHANNEL5, &DMA_InitStructure);
/* Enable the USARTx Interrupt */
NVIC_InitStructure.NVIC_IRQ = DMA1_Channel4_5_IRQn;//ÖжÏͨµÀ
NVIC_InitStructure.NVIC_IRQPreemptPriority = 0;//ÇÀÕ¼ÓÅÏȼ¶
NVIC_InitStructure.NVIC_IRQSubPriority = 0;//¸±ÓÅÏȼ¶
NVIC_InitStructure.NVIC_IRQEnable = ENABLE;//Ñ¡ÔñµÄͨµÀʹÄÜ
NVIC_Init(&NVIC_InitStructure);
DMA_INTConfig(DMA1_CHANNEL5, DMA_INT_TC|DMA_INT_HT, ENABLE);
/* DMA1 Channel5 enable */
DMA_Enable(DMA1_CHANNEL5, ENABLE);
}
/**
* @brief This function handles DMA1_Channel4_5 Handler.
* @param None
* @retval None DMA1_INT_TC5
*/
void DMA1_Channel4_5_IRQHandler(void)
{
uint16_t size;
if((DMA_GetIntBitState(DMA1_INT_TC5)!= RESET)||(DMA_GetIntBitState(DMA1_INT_HT5)!= RESET))
{
size = DMA_GetCurrDataCounter(DMA1_CHANNEL5);
if((size==256)||(size==512))
{
DDS_(size);
DMA_ClearIntBitState(DMA1_INT_TC5|DMA1_INT_HT5);
}
else
{
//DMA_ClearIntBitState(DMA1_INT_GL5|DMA1_INT_ERR5);
}
DMA_ClearIntBitState(DMA1_INT_GL5);
DMA_ClearIntBitState(DMA_INT_TC|DMA_INT_HT);
}
//DMA_ClearIntBitState(DMA1_INT_GL5|DMA1_INT_ERR5);
}
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