我用淘淘科技的STM332F407VGT6开发板 ，通过板子上DA发送一个幅值为3V、周期为1ms的正弦波，然后用AD采集一个周期的256点，之后调用DSP库中的FFT分析，然后在LCD上显示。但是在调程序的时候，对一下几个问题仍模糊：1、不知道DMA设置对不对； 2 不知道定时器设置对不对；3 不知道ADC采样时间设置对不对 ；4 不知道中断处理对不对- uint16_t j=0,k=0;
- uint16_t capture = 0;
- extern uint16_t ADC1ConvertedValue[512];
- float32_t adc_Value[256*2];
- uint16_t adc_Count=0;
- void TIM3_IRQHandler(void)
- {
- // if (TIM_GetITStatus(TIM3, TIM_IT_CC1) != RESET)
- if (TIM_GetITStatus(TIM3, TIM_IT_Update) != RESET)
- {
- j++;
- ADC_SoftwareStartConv(ADC1);
- if(j>=40000) //400
- {
- j=0;
- GPIO_ToggleBits(GPIOD,GPIO_Pin_12);
- LCD_ShowNum(25,75,78);
- }
- TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
- }
- }
- //bool adc_sample = false;
- void DMA2_Stream0_IRQHandler(void)
- {
- uint16_t i=0;
- if(DMA_GetFlagStatus(DMA2_Stream0,DMA_FLAG_TCIF0)!= RESET)
- {
- ADC_Cmd(ADC1, DISABLE);
- GPIO_ToggleBits(GPIOD,GPIO_Pin_13);
- // GPIO_SetBits(GPIOD,GPIO_Pin_13);
- // unsigned int aa;
- // aa=0;
- for(adc_Count=0;adc_Count<256*2;)
- {
- adc_Value[adc_Count++] = ADC1ConvertedValue[i]&0x0000ffff;
- adc_Value[adc_Count++] = 0;
- adc_Value[adc_Count++] = ADC1ConvertedValue[i++]>>16;
- adc_Value[adc_Count++] = 0;
- }
- FFT();
- adc_Count=0;
- ADC1->SR = 0;
- // DMA_Config();
- ADC_Cmd(ADC1, ENABLE);
- }
- DMA_ClearITPendingBit(DMA2_Stream0,DMA_IT_TCIF0);
- }
弄了几天还没搞定，希望大神帮我看看程序，指点一下- void DMA_Config(void)
- {
- // RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
- /* DMA2 Stream0 channel0 configuration **************************************/
- DMA_DeInit(DMA2_Stream0);
- DMA_InitStructure.DMA_Channel = DMA_Channel_0;
- DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;
- DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1ConvertedValue;
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; ///////// ??????????????
- DMA_InitStructure.DMA_BufferSize = 256;
- 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_FIFOMode = DMA_FIFOMode_Disable;
- DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
- DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
- DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
- DMA_Init(DMA2_Stream0, &DMA_InitStructure);
- DMA_Cmd(DMA2_Stream0, ENABLE);
- /* Enable DMA request after last transfer (Single-ADC mode) */
- ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
- /* Enable ADC1 DMA */
- ADC_DMACmd(ADC1, ENABLE);
- //使能DMA中断
- DMA_ITConfig(DMA2_Stream0,DMA_IT_TC , ENABLE);
- }
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