On Monday, June 23, 2014 4:57 AM, Ian Abbott wrote: > 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. Ugh.. My bad. I misread the tables. Greg, Please drop this patch. Thanks, Hartley _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
