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STM32F417 ADC DMA synchronization

Question asked by ml.michal on Apr 24, 2014
Latest reply on Apr 24, 2014 by ml.michal
Hi All, 

i'm running ADC example from STM's examples, and i'm having repeated values on 100kHz sinusoidal signal , probably it's not possible to sample it to have good resolution but it's only test for repeating , if i set 3cycles measuring i got only 1 repeated values 
this is the output from 15cycles instead of 3cycles measuring, 
please somebody could redirect me to the right discussion ? or somebody could help me to configure something to correct configuration ? 

ADC2 High : ADC1 Low: 088f0869 
ADC1 High : ADC3 Low: 092a08c4 
ADC3 High : ADC2 Low: 0a5809a8 

ADC2 High : ADC1 Low: 0a5809a8 
ADC1 High : ADC3 Low: 0a5809a8 
ADC3 High : ADC2 Low: 0a5809a8 

ADC2 High : ADC1 Low: 0a5809a8 
ADC1 High : ADC3 Low: 0a5809a8 
ADC3 High : ADC2 Low: 0a5809a8 

ADC2 High : ADC1 Low: 0a5809a8 
ADC1 High : ADC3 Low: 0a5809a8 
ADC3 High : ADC2 Low: 0a5809a8 

ADC2 High : ADC1 Low: 0bbd0b14 
ADC1 High : ADC3 Low: 0c9c0c42 
ADC3 High : ADC2 Low: 0cce0cc9 

ADC2 High : ADC1 Low: 0cce0cc9 
ADC1 High : ADC3 Low: 0cce0cc9 
ADC3 High : ADC2 Low: 0cce0cc9 

ADC2 High : ADC1 Low: 0cce0cc9 
ADC1 High : ADC3 Low: 0cce0cc9 
ADC3 High : ADC2 Low: 0cce0cc9 

ADC2 High : ADC1 Low: 0cce0cc9 
ADC1 High : ADC3 Low: 0cce0cc9 
ADC3 High : ADC2 Low: 0cce0cc9 

ADC2 High : ADC1 Low: 0c870cb7 
ADC1 High : ADC3 Low: 0bf60c4c 
ADC3 High : ADC2 Low: 0af30b7b 

ADC2 High : ADC1 Low: 0af30b7b 
ADC1 High : ADC3 Low: 0af30b7b 
ADC3 High : ADC2 Low: 0af30b7b 

ADC2 High : ADC1 Low: 0af30b7b 
ADC1 High : ADC3 Low: 0af30b7b 
ADC3 High : ADC2 Low: 0af30b7b 

ADC2 High : ADC1 Low: 0af30b7b 
ADC1 High : ADC3 Low: 0af30b7b 
ADC3 High : ADC2 Low: 0af30b7b 

ADC2 High : ADC1 Low: 09a20a50 
ADC1 High : ADC3 Low: 08840900 
ADC3 High : ADC2 Low: 083c0845 

ADC2 High : ADC1 Low: 083c0845 
ADC1 High : ADC3 Low: 083c0845 
ADC3 High : ADC2 Low: 083c0845 

ADC2 High : ADC1 Low: 083c0845 
ADC1 High : ADC3 Low: 083c0845 
ADC3 High : ADC2 Low: 083c0845 

ADC2 High : ADC1 Low: 083c0845 
ADC1 High : ADC3 Low: 083c0845 
ADC3 High : ADC2 Low: 083c0845 

ADC2 High : ADC1 Low: 08780847 
ADC1 High : ADC3 Low: 08fc08b7 
ADC3 High : ADC2 Low: 09d30959 

ADC2 High : ADC1 Low: 09d30959 
ADC1 High : ADC3 Low: 09d30959 
ADC3 High : ADC2 Low: 09d30959 

ADC2 High : ADC1 Low: 09d30959 
ADC1 High : ADC3 Low: 09d30959 
ADC3 High : ADC2 Low: 09d30959 

ADC2 High : ADC1 Low: 09d30959 
ADC1 High : ADC3 Low: 09d30959 
ADC3 High : ADC2 Low: 09d30959 

ADC2 High : ADC1 Low: 0b300a76 
ADC1 High : ADC3 Low: 0c620bda 
ADC3 High : ADC2 Low: 0cdd0cb8 

ADC2 High : ADC1 Low: 0cdd0cb8 
ADC1 High : ADC3 Low: 0cdd0cb8 
ADC3 High : ADC2 Low: 0cdd0cb8 

ADC2 High : ADC1 Low: 0cdd0cb8 
ADC1 High : ADC3 Low: 0cdd0cb8 
ADC3 High : ADC2 Low: 0cdd0cb8 

ADC2 High : ADC1 Low: 0cdd0cb8 
ADC1 High : ADC3 Low: 0cdd0cb8 
ADC3 High : ADC2 Low: 0cdd0cb8 


Thanks for all replies ... 

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