DAP Technology 1394, Руководство по эксплуатации

Страница: 189 / 458

Scriptor
189 Copyright © DapTechnology B.V., 2005-2019 - All Rights Reserved., 5/20/2019
if tcode == TCODE_READREQ
int q1 = getPacketHeaderField ( req, 1 , 16 , 16 )
int q2 = getPacketHeaderQuadlet ( req, 2 )
if q1 == 0xFFFF && ( q2 & 0xFFFFFC00 )== 0xF0000400
int addr = ( q2 & 0x3FF )>> 2
setPacketHeaderFields ( resp, RESPCODE_COMPLETE )
setPacketHeaderField ( resp, 1 , 16 , 4 ,
RESPCODE_COMPLETE )
writePacketHeader ( resp, 3 ,DATA_ID_1_FIRST ,addr, 1 )
sendPacket ( resp )
cnt = cnt +
1
setControlValue ( 1 ,cnt )
if addr == 3
setControlValue ( 10 , 1 )
else
setPacketHeaderFields ( resp, RESPCODE_ADDR_ERROR )
setPacketHeaderField ( resp, 1 , 16 , 4 ,
RESPCODE_ADDR_ERROR )
sendPacket ( resp )
cnt_addr_errors = cnt_addr_
1
setControlValue ( 2 ,cnt_addr_errors )
else
if tcode >= 0
setPacketHeaderFields ( resp, RESPCODE_TYPE_ERROR )
setPacketHeaderField ( resp, 1 , 16 , 4 ,
RESPCODE_TYPE_ERROR )
sendPacket ( resp )
cnt_type_errors = cnt_type_
1
setControlValue ( 3 ,cnt_type_errors )
11.6.2.2. Details
This script contains one data definition as can be seen by the only child of the "Data defines" node at the
top. The script again contains one function called main. This function starts by defining a couple of
constants by using "#define" statements. Then it declares and initializes a couple of integer variables of
which "req" and "resp" are initialized to id numbers of new packets. This is done with the "newPacket" API
function.
Now that two packets are setup, their header fields are set to some initial values by a couple of API calls.
(setPacketHeaderSize, setPacketHeaderQuadlet and setPacketHeaderField).
Then a couple of calls to the API function "setControlValue" are made to give the controls their initial
values. The control panel the controls belong to can be seen in the picture below.