Spectrum M2i.3010, Hardware Manual

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64 M2i.30xx / M2i.30xx-exp Manual
Channel Selection Analog Inputs
Analog Inputs
Channel Selection
One key setting that influences all other possible settings is the channel enable register. A unique feature of the Spectrum cards 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 card family. However, your specific board may have less channels
depending on the card type that you have purchased and therefore does not allow you to set the maximum number of channels shown here.
The channel enable register is set as a bitmap. That means that 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 when your card has a maximum of 1 channel.
The following table shows all allowed settings for the channel enable register when your card has a maximum of 2 channels.
The following table shows all allowed settings for the channel enable register in case that you have a four channel card.
Any channel activation mask that is not shown here is not valid. If programming an other channel activation,
the driver will return with an error code ERR_VALUE.
To help user programs it is also possible to read out the number of activated channels that correspond to the currently programmed bitmap.
Reading out the channel enable information can be done directly after setting it or later like this:
Register Value Direction Description
SPC_CHENABLE 11000 read/write Sets the channel enable information for the next card run.
CHANNEL0 1 Activates channel 0
CHANNEL1 2 Activates channel 1
CHANNEL2 4 Activates channel 2
CHANNEL3 8 Activates channel 3
spcm_dwSetParam_i32 (hDrv, SPC_CHENABLE, CHANNEL0 | CHANNEL1 | CHANNEL2 | CHANNEL3);
Channels to activate
Ch0 Values to program Value as hex Value as decimal
X CHANNEL0 1h 1
Channels to activate
Ch0 Ch1 Values to program Value as hex Value as decimal
X CHANNEL0 1h 1
X CHANNEL1 2h 2
X X CHANNEL0 | CHANNEL1 3h 3
Channels to activate
Ch0 Ch1 Ch2 Ch3 Values to program Value as hex Value as decimal
X CHANNEL0 1h 1
X CHANNEL1 2h 2
X CHANNEL2 4h 4
X CHANNEL3 8h 8
X X CHANNEL0 | CHANNEL1 3h 3
X X CHANNEL0 | CHANNEL2 5h 5
X X CHANNEL0 | CHANNEL3 9h 9
X X CHANNEL1 | CHANNEL2 6h 6
X X CHANNEL1 | CHANNEL3 Ah 10
X X CHANNEL2 | CHANNEL3 Ch 12
X X X X CHANNEL0 | CHANNEL1 | CHANNEL2 | CHANNEL3 Fh 15
Register Value Direction Description
SPC_CHCOUNT 11001 read Reads back the number of currently activated channels.
spcm_dwSetParam_i32 (hDrv, SPC_CHENABLE, CHANNEL0 | CHANNEL1);
spcm_dwGetParam_i32 (hDrv, SPC_CHENABLE, &lActivatedChannels);
spcm_dwGetParam_i32 (hDrv, SPC_CHCOUNT, &lChCount);
printf ("Activated channels bitmask is: 0x%08x\n", lActivatedChannels);
printf ("Number of activated channels with this bitmask: %d\n", lChCount);