National Instruments Corporation GPIB-1014P User Manual page 129

Appendix C
© National Instruments Corporation
|
| * * * * * * * * * * * * * * * * * * *
| * DATA SEND - DSEND*
| * * * * * * * * * * * * * * * * * * *
|
| Summary:
| - Called by WRITE to transmit data messages if the
| GPIB-1014P is Controller-In-Charge
| - Called directly from the main program if the
| GPIB-1014P is not CIC
|
| Assumptions on entry:
| - The GPIB-1014P is Standby or Idle Controller
| - GPIB-1014P is or will be addressed to talk
| - If the GPIB-1014P is Idle Controller, the current CIC
| will go to standby
| - The d0 register contains the byte count
| - The a0 register contains the address of the data
| buffer
| - The user specified variable veoi has been set
| properly
|
| Actions:
| - Copy byte count to d1
| - Wait until the CDOR is empty
| - Decrement d1
| - If last byte, assert EOI if in use
| - Write a byte
| - Check for a GPIB error
| - Loop until all bytes are transferred
| - On an error, set d0 to -1
|
| Status on return:
| - The d0 register contains the number of bytes
| transferred or a -1 to indicate an error
C-13
Sample Programs
GPIB-1014P User Manual