Echelon NodeBuilder Errors 3120 User Manual download pdf (Page 55)

NodeBuilder Errors Guide 5-35

NCC# Description

251

Assignment operator at top level of conditional expression

[NCC#251]

This warning is issued by the Neuron C compiler when it detects a

use of the assignment operator = in the top level of a conditional

expression, for example, in an if statement.

int a, b;

if (a = b) // This is an assignment

Although such a code construct is legal and useful in C (it assigns the

value of 'b' to 'a' and tests that value for nonzero, simultaneously), it

is also one of the most common coding errors in C programs for

novice and experienced programmers alike. Almost all C

programmers find themselves occasionally making this error when

an equality operator == is actually intended.

The purpose of this warning is to assist programmers in finding

programming errors. The warning may be silenced by recoding the

conditional expression for an explicit test against zero. The Neuron

C compiler's optimizer will produce identical code with or without the

explicit test, due to special optimization logic for this case, thus the

explicit test will not decrease program efficiency.

if ((a = b)!= 0)

252

Use of 'snvt_si_eecode' and 'snvt_si_ramcode' are exclusive

[NCC#252]

The compiler directives #pragma snvt_si_eecode and #pragma

snvt_si_ramcode are mutually exclusive, since the two directives

cause the compiler to force the placement of the SNVT/Self-

Identification information in mutually exclusive areas of memory.

253

Triac level I/O object cannot use the 'clockedge(+-)' option

[NCC#253]

The triac I/O object in level mode can only use the clockedge(+) or

clockedge(-) option.

254

Triac I/O object declaration defaults to triac 'pulse' object

[NCC#254]

Either pulse or level mode can be selected explicitly using the

appropriate keyword in the I/O declaration for a triac object. A

declaration without an explicit keyword will default to using pulse

mode. To silence the warning, modify the declaration to explicitly

specify the triac object's mode of operation.

255

One or more unterminated #if/#ifdef/#ifndef directives

[NCC#255]

The preprocessor directives controlling conditional compilation must

always exist in matching pairs, similar to the open brace { and close

brace } in a C program. The pairs #ifdef and #endif must match, for

example, with an optional #else contained in between.

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