On 2014-06-20 20:01, H Hartley Sweeten wrote:
On the PCI-1720 board, bipolar analog output ranges use two's complement data. Use comedi_offset_munge() to munge the comedi offset binary values before writing them to the hardware.
Which manual are you looking at? According to Table 4.7 in the PCI-1720U manual from Advantech, this should not be done as 0 corresponds to -Vref output, 0x800 corresponds to 0V output, and 0xFFF corresponds to +Vref output, which is what Comedi expects.
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