User`s manual

CHAPTER 4 PROGRAMMING TECBNIQUES

4.6. Interrupt Handling

10 'FILE NAME : EXAMPLE.6

20 'Program Example : INTERRUPT HANDLING

30 '

40 'Purpose : This program measures 100 voltage readings and

50 'displays them. It also goes to service

60 'subroutines when interrupts happen.

70 '

80 'Remark : The interrupt handing is for the Advanced BASIC

90 'Version A3.00 and higher only. For other BASIC

100 'Version, this may ont work because of the

110 'different memory arrangement.

120 'This program is written for the HP3478A DVM. If

130 'other models of voltmeters are used, please

140 'check the operating manual and make necessary ;

150 'modification to this program.

160 In this example, the program only shows when the

170 'interrupt happens. You can add more actions to

180 'the service routine to response to an interrupt.

190 '

200 'Initialization

210 '

220 CLS

230 DEF SEG=&HD000 240 ABORT%=9 : ENTER%=6 : OUTPUT%=3 :

STATUS%=42 : TRIGGER%=48 250 SPOLL%=39 : DEVCLR%=15

260 INIT%=0

270 IOPORT%=&H2B8 : MYADDR%=21 E

280 SETTING%=&HE1C ‘ Enable Bus Error, Timeout & select IRQ7

290 'for SRQ interrupt

300 CALL INIT%(IOPORT%,MYADDR%,SETTING%)

310 '

320

330 'Set the DVM & UNMASK Front Panel SRQ bit

340 '

350 ADDR%=23

360 CALL DEVCLR%(ADDR%)

370 FOR II=1 TO 1000 : NEXT II

380 D$=”KM20FlT3RAN5"

390 CALL OUTPUT%(ADDR%,DS) ‘ Send instrument setting string .

400 '

410 ON ERROR GOTO 580

420 ON KEY(l9) GOSUB 700 : KEY(l9) ON

430 ON KEY(20) GOSUB 770 : KEY(20) ON

440

450