I am not quite clear at which point of the signal chain your question aims.
signal at pin:GND to VDDA
ADC in: depends on selected reference
ADC out to Filter: signed integer
Filter out: signed int32
Filter to... ??? sram?: still signed int32
The DMA channel will not look at a sign and will transfer 32bit entities.
My problem is due to DMA channels which send data from ADC delsig to Filter block. It's passing trought signed bit(adcdelsig) to unsigned bit(dma). A signal which is positive sign is not problem but converting negative sign become problem for me. I want to solve this.
DMA is transferring data and there is no conversion between signed and unsigned.
Yes you are right, I was looking the DAC output. Thats my wrong. Now everthing is clear for me. Thank you and sorry for blank topic.
The DAC is only 8 bits wide and is unsigned (uint8) to convert a signed int8 into a uint8 just add 128.