我现在想用TIME4触发ADC1采样，待间隔的2KHz，但我设好后，觉得采样的间隔好像有出入，问：如何确定我的有样间隔是正确的！下面是Time4和相关代码的设置：
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 1799;
/* Note: if(TIM_Prescaler == 1) x1 else x2 */
TIM_TimeBaseStructure.TIM_Prescaler = 10;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
/* PWM1 Mode configuration: Channel4 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 900;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OC4Init(TIM4, &TIM_OCInitStructure);
/* TIM4 enable counter */
TIM_Cmd(TIM4, ENABLE);
/* DMA1 channel1 configuration -----------------------------------------------*/
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&ADC_RegularConvertedValueTab;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = 1024;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
/* Enable DMA1 channel1 */
DMA_Cmd(DMA1_Channel1, ENABLE);
DMA_ITConfig(DMA1_Channel1,DMA_IT_TC,ENABLE);
/* ADC1 configuration --------------------------------------------------------*/
ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T4_CC4;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfChannel = 1;
ADC_Init(ADC1, &ADC_InitStructure);
/* ADC1 regular channel12 configuration */
ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 1, ADC_SampleTime_71Cycles5);
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);
/* Enable ADC1 */
ADC_Cmd(ADC1, ENABLE);
/* Enable ADC1 external trigger */
ADC_ExternalTrigConvCmd(ADC1, ENABLE);
/* Enable ADC1 reset calibaration register */
ADC_ResetCalibration(ADC1);
/* Check the end of ADC1 reset calibration register */
while(ADC_GetResetCalibrationStatus(ADC1));
/* Start ADC1 calibaration */
ADC_StartCalibration(ADC1);
/* Check the end of ADC1 calibration */
while(ADC_GetCalibrationStatus(ADC1));
/**
* @brief This function handles DMA1_Channel1 exception.
* @param None
* @retval : None
*/
void DMA1_Channel1_IRQHandler(void)
{
OSIntEnter();
if(DMA_GetITStatus(DMA1_FLAG_TC1) != RESET)
{
/* Clear the DMA1 pending bit */
DMA_ClearFlag(DMA1_FLAG_TC1);
/* TIM1 counter enable */
TIM_Cmd(TIM4, DISABLE);
/* 定时器会被AD_HandleData()开启 */
}
OSSemPost(pSampleSiginalHandle);
OSIntExit();
} |
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