ADC Scan MODe

[ezrab]

Posted on November 25, 2010 at 15:38

hi.

i have aquestion.

if i use the scan mode to measure sevrel channels at the end of the list of channel to measure how can i collect all the data from all the channels?

or do i have collect the data after every measre?

thanks for your help.

[STM32 hobbyist]

Posted on November 25, 2010 at 17:36

You can refer to AN3116: ''STM32's ADC modes and their applications''. It shows you how to use the ADC its different modes with correspendant example.

[ezrab]

Posted on November 28, 2010 at 07:01

hi.

thanks for the replay the document was good but only explainas the general option not how.

my question still remains how can i collect all the sampelling data after ''Multichannel (scan), single conversion mode''

where will it be stored?

is there an exampe to ''Multichannel (scan), single conversion mode''?

thanks

[ezrab]

Posted on November 28, 2010 at 07:19

as far as i can understand this can be done with DMA to transfer the result of the conversion to the RAM but the DMA has only 7 channels what if i need more like 9 conversion?

is there away to do it?

thanks.

[Tesla DeLorean]

Posted on November 28, 2010 at 16:07

as far as i can understand this can be done with DMA to transfer the result of the conversion to the RAM but the DMA has only 7 channels what if i need more like 9 conversion?

 

 

is there away to do it?

 

 

And of those 7 DMA channels, exactly how many are connected to the ADC(s)? There is a diagram and table in the TRM that would be worth reviewing.

I haven't dug into this, but surely it would use a SINGLE DMA channel, and interleave/sequence the readings? And use a large linear, or circular buffer.

[ezrab]

Posted on November 29, 2010 at 07:54

''use a SINGLE DMA channel, and interleave/sequence the readings? And use a large linear, or circular buffer.''

 

 

sounds great but where can i find how to do that?

thanks.

[ezrab]

Posted on November 29, 2010 at 08:02

never mind i found it here AN3116

at scan ScanContinuous example.

thanks.