Spectrum Brands MI.20xx - Manual (Page 62)

62 MI.20xx Manual
Channel Trigger Trigger modes and appendant registers
Channel Trigger
Overview of the channel trigger registers
The channel trigger modes are the most common modes, compared to external equipment like oscilloscopes. The 17 different channel trigger
modes enable you to observe nearly any part of the analog signal. This chapter is about to explain the different modes in detail. To enable
the channel trigger, you have to set the triggermode register accordingly. Therefore you have to choose, if you either want only one channel
to be the trigger source, or if you want to combine two or more channels to a logical OR trigger. The following table shows the according
registers for the two general channel trigger modes.
If you have set the general triggermode to channel trigger you must set the all of the channels to their modes according to the following table.
So even if you use TM_CHANNEL and only want to observe one channel, you need to deactivate all other
channels. You can do this by setting the channel specific register to the value TM_CHXOFF.
The tables lists the maximum of the available channel mode registers for your card’s series. So it can be that you have less channels installed
on your specific card and therefore have less valid channel mode registers. If you try to set a channel, that is not installed on your specific
card, a error message will be returned.
So if you want to set up a four channel board to detect only a positive edge on channel0, you would have to setup the board like the following
example. Both of the examples either for the TM_CHANNEL and the TM_CHOR triggermode do not include the necessary settigs for the
triggerlevels. These settings are detailed described in the following paragraphs.
If you want to set up a four channel board to detect a triggerevent on either a positive edge on channel1 or a negative edge on channel3
you would have to set up your board as the following example shows.
Register Value Direction Description
SPC_TRIGGERMODE 40000 r/w Sets the triggermode for the board.
TM_CHANNEL 20040 Enables the channel trigger mode so that only one channel can be a trigger source.
TM_CHOR 35000 Enables the channel trigger mode so that more than one channel can be a trigger source.
Register Value Direction Description
SPC_TRIGGERMODE0 40200 r/w Sets the trigger mode for channel0. Channeltrigger must be activated with SPC_TRIGGERMODE.
SPC_TRIGGERMODE1 40201 r/w Sets the trigger mode for channel1. Channeltrigger must be activated with SPC_TRIGGERMODE.
SPC_TRIGGERMODE2 40202 r/w Sets thetrigger mode for channel2. Channeltrigger must be activated with SPC_TRIGGERMODE.
SPC_TRIGGERMODE3 40203 r/w Sets the trigger mode for channel3. Channeltrigger must be activated with SPC_TRIGGERMODE.
TM_CHXOFF 10020 Channel is not used for trigger detection.
TM_CHXPOS 10000 Enables the trigger detection for positive edges
TM_CHXNEG 10010 Enables the trigger detection for negative edges
TM_CHXBOTH 10030 Enables the trigger detection for positive and negative edges
TM_CHXPOS_LP 10001 Enables the pulsewidth trigger detection for long positive pulses
TM_CHXNEG_LP 10011 Enables the pulsewidth trigger detection for long negative pulses
TM_CHXPOS_SP 10002 Enables the pulsewidth trigger detection for short positive pulses
TM_CHXNEG_SP 10012 Enables the pulsewidth trigger detection for short negative pulses
TM_CHXPOS_GS 10003 Enables the steepness trigger detection for flat positive pulses
TM_CHXNEG_GS 10013 Enables the steepness trigger detection for flat negative pulses
TM_CHXPOS_SS 10004 Enables the steepness trigger detection for steep positive pulses
TM_CHXNEG_SS 10014 Enables the steepness trigger detection for steep negative pulses
TM_CHXWINENTER 10040 Enables the window trigger for entering signals
TM_CHXWINLEAVE 10050 Enables the window trigger for leaving signals
TM_CHXWINENTER_LP 10041 Enables the window trigger for long inner signals
TM_CHXWINLEAVE_LP 10051 Enables the window trigger for long outer signals
TM_CHXWINENTER_SP 10042 Enables the window trigger for short inner signals
TM_CHXWINLEAVE_SP 10052 Enables the window trigger for short outer signals
SpcSetParam (hDrv, SPC_TRIGGERMODE , TM_CHANNEL); // Enable channel trigger mode
SpcSetParam (hDrv, SPC_TRIGGERMODE0, TM_CHXPOS ); // Set triggermode of channel0 to positive edge trigger
SpcSetParam (hDrv, SPC_TRIGGERMODE1, TM_CHXOFF ); // Disable channel1 concerning trigger detection
SpcSetParam (hDrv, SPC_TRIGGERMODE2, TM_CHXOFF ); // Disable channel2 concerning trigger detection
SpcSetParam (hDrv, SPC_TRIGGERMODE3, TM_CHXOFF ); // Disable channel3 concerning trigger detection
SpcSetParam (hDrv, SPC_TRIGGERMODE , TM_CHOR ); // Enable channel OR trigger mode
SpcSetParam (hDrv, SPC_TRIGGERMODE0, TM_CHXOFF); // Disable channel0 concerning trigger detection
SpcSetParam (hDrv, SPC_TRIGGERMODE1, TM_CHXPOS); // Set triggermode of channel1 to positive edge trigger
SpcSetParam (hDrv, SPC_TRIGGERMODE2, TM_CHXOFF); // Disable channel2 concerning trigger detection
SpcSetParam (hDrv, SPC_TRIGGERMODE3, TM_CHXNEG); // Set triggermode of channel3 to positive edge trigger