Can you break expressions up on multiple lines?
Yes, just end each line with a semi-colon. The following Signal gives an
example:
SET(V#1, MA / CL);
IF(V#1 > 0) THEN (SET(V#2, HI)) ELSE (SET(V#3, LO));
V#1 > 0
The actual true/false result of the signal will be the result of the
last line (V#1 > 0). The first two lines just server to manage
variables.
Can you nest if-then-else statements?
Currently, this doesn't work very reliably. However, in general, you can
use certain tricks to get around this limitation. For instance, assume
you wanted to do the following:
IF(CL > OP) THEN (IF(CL > OP.1) THEN (SET(V#5,
3)) ELSE (SET(V#5, 2)) ELSE (SET(V#5, 1));
While that expression won't parse properly, you could instead do the
following:
SET(V#5, (CL > OP) * ((CL > OP.1) * 3 + (CL
<= OP.1) * 2) + (CL <= OP) * 1);
Or you could just use two lines with:
IF(CL <= OP AND CL <= OP.1) THEN (SET(V#5,
1)) ELSE (SET(V#5, 2));
IF(CL > OP) THEN SET(V#5, 3);
How do you insert comments into RTL syntax?
Just enclose your comments like this: /* comment goes here */;
For example:
SET(V#1, MA / CL); /* Set V#1 to ration of MA
over CL */
IF(V#1 > 0) THEN (SET(V#2, HI)) ELSE (SET(V#3, LO));
V#1 > 0 /* return true if V#1 is above zero */
Anything within the /* comment brackets */ is purely for
documentation.
Can you include multiple statements within the scope of an
if/else/then if statement?
Yes. You can AND or OR together as many true/false expressions as you
like within the if statement:
IF(CL > CL.1 AND CL.1 > CL.2 AND CL > CL.3)
THEN (SET(V#1, HI));
And you can AND together as many statements as you like within the
THEN or ELSE:
IF(CL > CL.1) THEN (SET(V#1, CL) AND SET(V#2,
CL.1)) ELSE (SET(V#1, CL.1) AND SET(V#2, CL));
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