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Analog Inputs Channel Selection
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Analog Inputs
Channel Selection
One key setting that influences all other possible settings is the channel enable register. An unique feature of the Spectrum boards is the
possibility to program the number of channels you want to use. All on-board memory can then be used by these activated channels.
This description shows you the channel enable register for the complete board family. However your specific board may have less channels
depending on the board type you purchased and did not allow you to set the maximum number of channels shown here.
The channel enable register is set as a bitmap. That means one bit of the value corresponds to one channel to be activated. To activate more
than one channel the values have to be combined by a bitwise OR.
Example showing how to activate 4 channels:
The following table shows all allowed settings for the channel enable register.
Any channel activation mask that is not shown here is not valid. If programming another channel activation
the driver automatically remaps this to the best matching activation mask. You can read out the channel en-
able register to see what channel activation mask the driver has set.
Reading out the channel enable register can be done directely after setting it or later like this:
Important note on channels selection
As some of the manuals passages are used in more than one hardware manual most of the registers and
channel settings throughout this handbook are described for the maximum number of possible channels that
are available on one board of the actual series. There can be less channels on your actual type of board or
bus-system. Please refer to the table above to get the actual number of available channels.
Register Value Direction Description
SPC_CHENABLE 11000 r/w Sets the channel enable information for the next board run.
CHANNEL0 1 Activates channel 0
CHANNEL1 2 Activates channel 1
CHANNEL2 4 Activates channel 2
CHANNEL3 8 Activates channel 3
SpcSetParam (hDrv, SPC_CHENABLE, CHANNEL0 | CHANNEL1 | CHANNEL2 | CHANNEL3);
Channels to activate
Ch0 Ch1 Ch2 Ch3 Values to program Value as hex Value as decimal
X CHANNEL0 1h 1
X X CHANNEL0 | CHANNEL1 3h 3
X X CHANNEL0 | CHANNEL2 5h 5
X X X X CHANNEL0 | CHANNEL1 | CHANNEL2 | CHANNEL3 Fh 15
SpcGetParam (hDrv, SPC_CHENABLE, &lActivatedChannels);
printf ("Activated channels are: %ld \n", lActivatedChannels);