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使用STM32F4的ADC采集4路电压信号,通过DMA传输,可是串口助手一直不能接受数据
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应该是if(DMA_GetFlagStatus(DMA2_Stream0,DMA_FLAG_TCIF0)!=RESET)一直不通过,但是不知道为什么,希望大家帮忙看看
- 主程序
- int main(void)
- {
- delay_init(168);
- uart_init(115200);
- Adc_Init();
- LED_Init();
- delay_ms(10);
- MYDMA_Config(DMA2_Stream0,(u32)&ADC1->DR,(u32)&ADC_V);
- while(1)
- {
- if(DMA_GetFlagStatus(DMA2_Stream0,DMA_FLAG_TCIF0)!=RESET)
- {
- LED0=0;
- printf("adc0=%d ",ADC_V[0]);
- printf("adc1=%d ",ADC_V[1]);
- printf("adc0=%d ",ADC_V[2]);
- printf("adc1=%d ",ADC_V[3]);
- DMA_ClearFlag(DMA2_Stream0,DMA_FLAG_TCIF0);
- }
- delay_ms(1);
- }
- }
- ADC程序
- void Adc_Init(void)
- {
- GPIO_InitTypeDef GPIO_InitStructure;
- ADC_CommonInitTypeDef ADC_CommonInitStructure;
- ADC_InitTypeDef ADC_InitStructure;
-
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);//ê1ÄüGPIOAê±Öó
- RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); //ê1ÄüADC1ê±Öó
- GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_5|GPIO_Pin_6;
- GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;//Ä£Äaêäèë
- GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;//2»′øéÏÏÂà-
- GPIO_Init(GPIOA, &GPIO_InitStructure);//3õê¼»ˉ
-
- RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,ENABLE); //ADC1¸′λ
- RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC1,DISABLE); //¸′λ½áêø
-
-
- ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;//¶àá¢Ä£ê½
- ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;//ὸö2éÑù½×¶ÎÖ®¼äμÄÑó3ù5¸öê±Öó
- ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_1;
- ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div4;//Ô¤·ÖÆμ4·ÖÆμ¡£ADCCLK=PCLK2/4=84/4=21Mhz,ADCê±Öó×îoÃ2»òa3¬1y36Mhz
- ADC_CommonInit(&ADC_CommonInitStructure);//3õê¼»ˉ
-
- ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;//12λÄ£ê½
- ADC_InitStructure.ADC_ScanConvMode = ENABLE;
- ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
- ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;//½ûÖ1′¥·¢¼ì2a£¬ê1óÃèí¼t′¥·¢
- ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;//óò¶ÔÆë
- ADC_InitStructure.ADC_NbrOfConversion = 4;
- ADC_Init(ADC1, &ADC_InitStructure);//ADC3õê¼»ˉ
-
- ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_480Cycles ); //ADC1,ADCí¨μà,480¸öÖüÆú,ìá¸ß2éÑùê±¼ä¿éòÔìá¸ß¾«è·¶è
- ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_480Cycles );
- ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 3, ADC_SampleTime_480Cycles );
- ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 4, ADC_SampleTime_480Cycles );
-
-
- ADC_Cmd(ADC1, ENABLE);
- ADC_SoftwareStartConv(ADC1);
- ADC_DMARequestAfterLastTransferCmd(ADC1,ENABLE);
- ADC_DMACmd(ADC1,ENABLE);
-
- }
- DMA程序
- void MYDMA_Config(DMA_Stream_TypeDef *DMA_Streamx,u32 par,u32 mar)
- {
-
- DMA_InitTypeDef DMA_InitStructure;
-
- if((u32)DMA_Streamx>(u32)DMA2)//μÃμ½μ±Ç°streamêÇêôóúDMA2»1êÇDMA1
- {
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);//DMA2ê±Öóê1Äü
-
- }else
- {
- RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);//DMA1ê±Öóê1Äü
- }
- DMA_DeInit(DMA_Streamx);
-
- while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){}//μè′yDMA¿éÅäÖÃ
-
- /* ÅäÖÃ DMA Stream */
- DMA_InitStructure.DMA_Channel = DMA_Channel_0; //í¨μàÑ¡Ôñ
- DMA_InitStructure.DMA_PeripheralBaseAddr = par;//DMAíaéèμØÖ·
- DMA_InitStructure.DMA_Memory0BaseAddr = mar;//DMA ′æ′¢Æ÷0μØÖ·
- DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//íaéèμ½′æ′¢Æ÷
- DMA_InitStructure.DMA_BufferSize = 100;//êy¾Y′«êäá¿
- DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//íaéè·ÇÔöá¿Ä£ê½
- DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//′æ′¢Æ÷Ôöá¿Ä£ê½
- DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;//íaéèêy¾Y3¤¶è:16λ
- DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;//′æ′¢Æ÷êy¾Y3¤¶è:16λ
- DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;//Ñ-»·Ä£ê½
- DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//ÖDμèóÅÏ輶
- DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
- DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
- DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//′æ′¢Æ÷í»·¢μ¥′Î′«êä
- DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//íaéèí»·¢μ¥′Î′«êä
- DMA_Init(DMA_Streamx, &DMA_InitStructure);//3õê¼»ˉDMA Stream
- DMA_Cmd(DMA_Streamx, ENABLE); //¿aÆôDMA′«êä
-
- }
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