Hi, sorry for my late answer - I was busy programming the DSP. I ran a few tests and realized that it is always the right channel then left chennel. How ever - I don't know why it is right - left here and not left-right but it seams to run stable that way. Maybe I can change the FSR polarity in the ADCs - then I would be left first - then right channel. Knowing that it is always right-left is great for me. Thanks so far, Alex dbaudiopro wrote: > > Alex, > > If you initialize the DMA properly and avoid all DMA related errata it > should guarantee that information is always brought in left channel > then right channel. I've have some simple audio passthru code I've used > for years based on DMA and never noticed a channel swap (though I will > admit I've not spend any time specifically testing for it)... >

Alex, If you initialize the DMA properly and avoid all DMA related errata it should guarantee that information is always brought in left channel then right channel. I've have some simple audio passthru code I've used for years based on DMA and never noticed a channel swap (though I will admit I've not spend any time specifically testing for it)... -- dB --- Alexander Trica <moto@moto...> wrote: > Hi @ all, > > I have a question concerning the ESAI data transfer using a DMA > channel. > > I configured the DMA0 channel to transfer the ESAI data (ADC data, > i2s mode) from the RX0 register to the X memory space. Since there is > > no other DMA trigger source I am using the mode 01011 as DMA request > source which is "ESAI receive data" (RDF=1). For my application it is > > important to know which channel (left or right) of the ADC I am > receiving. Since there is only one DMA request source (RDF=1) how can > > I distinguish between right an left channel data? > > Using interrupts to get the data from the ESAI receiver it is no > problem to differ between left an right channel ADC data. Using the > odd and even data interrupts or checking the REDF or RODF bits in > the ISR is working fine for me. > > How can I differ between left and right channel data using DMA > transfers? > > Best Regards > Alex > -- > K&S Mechatronik GmbH > Tel.: +49 3677 668 489 > Fax: +49 3677 20 33 77 > http://www.ks-mechatronik.de > > __________________________________________________

Hi @ all, I have a question concerning the ESAI data transfer using a DMA channel. I configured the DMA0 channel to transfer the ESAI data (ADC data, i2s mode) from the RX0 register to the X memory space. Since there is no other DMA trigger source I am using the mode 01011 as DMA request source which is "ESAI receive data" (RDF=1). For my application it is important to know which channel (left or right) of the ADC I am receiving. Since there is only one DMA request source (RDF=1) how can I distinguish between right an left channel data? Using interrupts to get the data from the ESAI receiver it is no problem to differ between left an right channel ADC data. Using the odd and even data interrupts or checking the REDF or RODF bits in the ISR is working fine for me. How can I differ between left and right channel data using DMA transfers? Best Regards Alex -- K&S Mechatronik GmbH Tel.: +49 3677 668 489 Fax: +49 3677 20 33 77 http://www.ks-mechatronik.de