National Instruments Corporation GPIB-1014P User Manual page 132

Sample Programs
68000 Code
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WRITE: movw #4,cmdct.L
movb #UNT,cmdbuf.L
movb #UNL,cmdbuf.L+1
movb #MA+100,cmdbuf.L+2 |
movb #ola,cmdbuf.L+3
bsr CMD
movb #GTS,AUXMR.L
movw #datct,d0
movl #datbuf,a0
bsr DSEND
WRITE1: btst #DO,ISR1.L
beq WRITE1
movb #TCA,AUXMR.L
subw #2,cmdct.L
bsr CMD
rts
GPIB-1014P User Manual
|
| Comments
|
| Put Untalk, Unlisten, MTA, and OLA
| commands in the buffer
|
|
| Call CMD to address GPIB devices
| Go to standby and drop ATN
| Preset d0 register with byte count
| Preset a0 register with address of buffer
| Source Handshake-Data will write data
| Wait until last byte has been sent
|
| Then take control
| Prepare to unaddress all Talkers and Listeners
|
|
C-16
Appendix C
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