Spectrum M2p.59 Series, Hardware Manual, Page: 128 / 190

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Additional I/O lines with Option -DigSMB and -DigFX2 Multi Purpose I/O Lines
Asynchronous I/O
To use asynchronous I/O on the multi purpose I/O lines it is first necessary to switch these lines to the desired asynchronous mode by pro -
gramming the above explained mode registers. As a special feature asynchronous input can also be read if the mode is set to trigger input
or digital input.
Example of asynchronous write and read. We write a high pulse on output X4 and wait for a high level answer on input X19:
Synchronous digital inputs
The cards of the M2p series allow a very detailed setup on how to optionally record synchronous digital channels along with analog acqui -
sition. The SPC_DIGMODEx register allows the setup separately for every analog channel. The table below shows the related registers and
the values that correspond with the different possibilities. The mask and mode and mode values have to properly be combined. This is shown
in the example below the tables:
Register Value Direction Description
SPCM_XX_ASYNCIO 47220 read/write Connector X4 is linked to bit 4 of the register, connector X5 is linked to bit 5 and so on until X19 on
bit 19. Data is written/read immediately without any relation to the currently used sampling rate or
mode. If a line is programmed to output, reading this line asynchronously will return the current out -
put level.
spcm_dwSetParam_i32 (hDrv, SPCM_X19_MODE, SPCM_XMODE_ASYNCIN); // X1 set to asynchronous input
spcm_dwSetParam_i32 (hDrv, SPCM_X4_MODE, SPCM_XMODE_ASYNCOUT); // X2 set to asynchronous output
spcm_dwSetParam_i32 (hDrv, SPCM_XX_ASYNCIO, 0x00); // programming a high pulse on output X4
spcm_dwSetParam_i32 (hDrv, SPCM_XX_ASYNCIO, 0x10);
spcm_dwSetParam_i32 (hDrv, SPCM_XX_ASYNCIO, 0x00);
do {
spcm_dwGetParam_i32 (hDrv, SPCM_XX_ASYNCIO, &lAsyncIn); // read input in a loop
} while ((lAsyncIn & 0x10000) == 0); // until X19 is going to high level
Table 76: Spectrum API: registers for synchronous digital inputs
Register Value Direction Description
SPC_DIGMODE0 47250 read/write Set the digital input sources for channel 0.
SPC_DIGMODE1 47251 read/write Set the digital input sources for channel 1.
SPC_DIGMODE2 47252 read/write Set the digital input sources for channel 2.
SPC_DIGMODE3 47253 read/write Set the digital input sources for channel 3.
SPC_DIGMODE4 47254 read/write Set the digital input sources for channel 4.
SPC_DIGMODE5 47255 read/write Set the digital input sources for channel 5.
SPC_DIGMODE6 47256 read/write Set the digital input sources for channel 6.
SPC_DIGMODE7 47257 read/write Set the digital input sources for channel 7.
SPCM_DIGMODE_OFF 00000000h Disable acquisition of digital data for the masked analog bit (see masks below).
SPCM_DIGMODE_CHREPLACE FFBBCFFFh Convenient AND/OR combination of all the below SPCM_DIGMODEx and DIGMODEMASK_BITx bits to completely
replace all the Bits of an analog channel with the sixteen bits (X19...X4) provided by the -DigDMB or -DigFX2 option.
SPCM_DIGMODE_X4 84210001h Enable acquisition of multi-purpose input X4 for the masked analog bit (see masks below).
SPCM_DIGMODE_X5 8C631002h Enable acquisition of multi-purpose input X5 for the masked analog bit (see masks below).
SPCM_DIGMODE_X6 94A52004h Enable acquisition of multi-purpose input X6 for the masked analog bit (see masks below).
SPCM_DIGMODE_X7 9CE73008h Enable acquisition of multi-purpose input X7 for the masked analog bit (see masks below).
SPCM_DIGMODE_X8 A5294010h Enable acquisition of multi-purpose input X8 for the masked analog bit (see masks below).
SPCM_DIGMODE_X9 AD6B5020h Enable acquisition of multi-purpose input X9 for the masked analog bit (see masks below).
SPCM_DIGMODE_X10 B5AD6040h Enable acquisition of multi-purpose input X10 for the masked analog bit (see masks below).
SPCM_DIGMODE_X11 BDEF7080h Enable acquisition of multi-purpose input X11 for the masked analog bit (see masks below).
SPCM_DIGMODE_X12 C6318100h Enable acquisition of multi-purpose input X12 for the masked analog bit (see masks below).
SPCM_DIGMODE_X13 CE739200h Enable acquisition of multi-purpose input X13 for the masked analog bit (see masks below).
SPCM_DIGMODE_X14 D6B5A400h Enable acquisition of multi-purpose input X14 for the masked analog bit (see masks below).
SPCM_DIGMODE_X15 DEF7B800h Enable acquisition of multi-purpose input X15 for the masked analog bit (see masks below).
SPCM_DIGMODE_X16 E739C000h Enable acquisition of multi-purpose input X16 for the masked analog bit (see masks below).
SPCM_DIGMODE_X17 EF7BD000h Enable acquisition of multi-purpose input X17 for the masked analog bit (see masks below).
SPCM_DIGMODE_X18 F7BDE000h Enable acquisition of multi-purpose input X18 for the masked analog bit (see masks below).
SPCM_DIGMODE_X19 FFFFF000h Enable acquisition of multi-purpose input X19 for the masked analog bit (see masks below).
DIGMODEMASK_BIT15 F8000000h Enable acquisition of a digital source (sources see above) into bit15 of the analog sample. Any X-Input allowed.
DIGMODEMASK_BIT14 07C00000h Enable acquisition of a digital source (sources see above) into bit14 of the analog sample. Any X-Input allowed.
DIGMODEMASK_BIT13 003E0000h Enable acquisition of a digital source (sources see above) into bit13 of the analog sample. Any X-Input allowed.
DIGMODEMASK_BIT12 0001F000h Enable acquisition of a digital source (sources see above) into bit12 of the analog sample. Any X-Input allowed.
DIGMODEMASK_BIT11 00000800h Enable acquisition of X15 into bit11 of the analog sample.
DIGMODEMASK_BIT10 00000400h Enable acquisition of X14 into bit10 of the analog sample.