National Instruments Corporation GPIB-1014P User Manual page 128

Sample Programs
68000 Code
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READ: movb cmdbuf.L,cmdbuf.L+2 | Put Untalk and Unlisten commands before
movb #UNT,cmdbuf.L
movb #UNL,cmdbuf.L+1
addw #2,cmdct.L
bsr CMD
movb #LTN,AUXMR.L
movb #GTS,AUXMR.L
movw #datct,d0
movl #datbuf,a0
bsr RCV
movb TCS,AUXMR.L
READ1: btst#NATN,ADSR
bne READ1
subw #1,cmdct
bsr CMD
movb #LUN,AUXMR.L
rts
GPIB-1014P User Manual
|
| Comments
|
| Talker address in the buffer
|
|
| Command routine will address the Talker
| Program GPIB-1014P to be a Listener
| so it can take control synchronously
| later; then go to standby and drop ATN
| Take control
| Preset d0 register with byte count
| Preset a0 register with buffer address
| Receive routine will read data
|
|
| Wait for ATN, indefinitely
|
|
| Prepare to unaddress all Talkers and Listeners
| using CMD
|
| Send Local Unlisten command
|
|
C-12
Appendix C
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