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Nucleo F746 ADC DMA noise on the second half transfer!!!

Question asked by qiyong.mu.001 on Oct 7, 2016
Latest reply on Oct 10, 2016 by FTITI.Walid
I tied the ADC in to GND, make the ADC DMA work normal mode, what ever I change the transfer size, the nois is big different just in the middle.
Crazzy!!!
ADC_Sample.jpg
Data shows in the figure is 16bit AD1,AD2,AD1,AD2.....
/*ADC configed multi-mode*/


    multimode.Mode = ADC_DUALMODE_REGSIMULT;
    multimode.DMAAccessMode = ADC_DMAACCESSMODE_2;
    multimode.TwoSamplingDelay = ADC_TWOSAMPLINGDELAY_5CYCLES;
    HAL_ADCEx_MultiModeConfigChannel(&Adc1Handle, &multimode);
    HAL_ADCEx_MultiModeConfigChannel(&Adc2Handle, &multimode);

 

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