National Instruments Corporation GPIB-1014P User Manual page 134

Sample Programs
|
68000 Code
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CMD: movb #TCA,AUXMR.L
movl
movw
bsr
rts
GPIB-1014P User Manual
|
* * * * * * * * * * * * * * **
| * COMMAND - CMD*
| * * * * * * * * * * * * * * *
|
| Summary:
| - Send GPIB interface or command messages
|
| Assumptions on entry:
| - The GPIB-1014P is Controller-In-Charge
| - The commands to be sent are in cmdbuf
| - The variable cmdct contains the number of
| commands to be sent, which must be less than 256
| - Interruption of any data transfer in progress is
| acceptable
|
| Actions:
| - Issue TCA command to assert ATN in case the
| GPIB-1014P is at standby
| - Load the d0 register with the address of cmdbuf
| - Load a0 with the number of commands
| - Call CSEND to transmit the bytes
|
| Status on return:
| - GPIB-1014P is Active Controller
| - GPIB devices are programmed as implied by
| command bytes
|
|
| Comments
|
| Take control in case at standby
#cmdbuf,a0
#cmdct,d0
CSEND
|
C-18
*
| Set up registers for CSEND call
|
|
© National Instruments Corporation
Appendix C