On 06/04/16 19:06, H Hartley Sweeten wrote:
The "hc" type boards have 64 analog input channels with a 64 entry queue. All the others have 16 channels and a 256 entry queue. Currently the boardinfo 'qram_len' is used to initialize the subdevice 'n_chan' and 'len_chanlist'. This works for the 64 channel boards but sets the 'n_chan' wrong for the 16 channel boards.
I think the 256 QRAM positions is to allow use with a set of EXP-1800 boards, each of which can multiplex one of the single-ended inputs of the DAS-1800 series into 16 channels. According to the user's guide, they can be daisy chained to provide up to 256 channels.
Datasheet: http://www.tek.com/sites/tek.com/files/media/media/resources/exp-1800_ds.pdf User's Guide download page (need to fill in contact info!): http://www.tek.com/manual/exp-1800-users-guide-92160b-manual So it's probably best to leave the number of channels alone. -- -=( Ian Abbott @ MEV Ltd. E-mail: <abbotti@xxxxxxxxx> )=- -=( Web: http://www.mev.co.uk/ )=- _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
