Intel 80C188EC User Manual page 355

SERIAL COMMUNICATIONS UNIT
$mod186
name
;*******************************************************************
; FUNCTION: This function demonstrates how to implement the three
; master/slave routines (_slave_1, _select_slave, and _send_slave_command)
; in a typical setup.
;
; NOTE: It is assumed that the network is set up as shown in
; Figure 11-18, that the slave unit is running the
; _slave_1 code, and that the PCB is located in I/O space.
;
;*******************************************************************
Slave1 equ
Flash equ
Disc equ
False equ
lib_80186 segment public 'code'
extrn _select_slave:far
extrn _send_slave_cmd:far
lib_80186 ends
code segment public 'code'
assume cs:code
public _main
_main proc near
push Slave1
;send the address over the network
call far ptr _select_slave
add
cmp
je
push Flash
;send it
call far ptr _send_slave_cmd
add
;insert a delay routine to allow completion of last command
push Disc
;send it
call far ptr _send_slave_cmd
add
SlaveExit: ret
_main endp
code ends
end _main
Example 11-3. Master/Slave — Implementing the Master/Slave Routines
11-26
example_master_slave
01h ;address assigned to slave unit 1
01h ;command to flash EVAL board LEDs
0fh ;command to disconnect from network
00h
;declare external routines
;get slave unit 1 address
sp, 2 ;adjust sp
ax, false ;was slave 1 properly selected ?
SlaveExit ;no: then exit
;yes: then send Flash command
sp, 2 ;adjust sp
;prepare to disconnect slave
sp, 2 ;adjust sp