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#if define string comparison for preprocessor directive
Difference between InvariantCulture and Ordinal string comparisonWhy is 'this' a pointer and not a reference?Improve INSERT-per-second performance of SQLite?Concatenate int to string using C PreprocessorWhen to use references vs. pointersGLSL preprocessorWhy does the C preprocessor interpret the word “linux” as the constant “1”?C/C++ preprocessor directive for handing compilation errorsHow does the C preprocessor handle circular dependencies?Get options used for compilation with preprocessor directives
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I'm trying to define an array with preprocessor directives to have variable size. This array is filled depending of #define :
#define PORTA (*(PORT_t *) 0x0400)
#define EXP_GPIO0_PORT PORTA
#define EXP_GPIO0_PIN 0
I want to fill the array with :
const uint8_t PortAGpiosPortpinUsed[] =
#if EXP_GPIO0_PORT == PORTA
EXP_GPIO0_PIN,
#endif
As PORTA is a pointer, the compiler (GCC) doesn't allow this preprocessor syntax. Is there any solution to get it working ?
Thanks
Syl
c pointers directive string-comparison preprocessor
asked Mar 28 at 20:11
WormzyWormzy
91 bronze badge
add a comment
|
I'm trying to define an array with preprocessor directives to have variable size. This array is filled depending of #define :
#define PORTA (*(PORT_t *) 0x0400)
#define EXP_GPIO0_PORT PORTA
#define EXP_GPIO0_PIN 0
I want to fill the array with :
const uint8_t PortAGpiosPortpinUsed[] =
#if EXP_GPIO0_PORT == PORTA
EXP_GPIO0_PIN,
#endif
As PORTA is a pointer, the compiler (GCC) doesn't allow this preprocessor syntax. Is there any solution to get it working ?
Thanks
Syl
c pointers directive string-comparison preprocessor
asked Mar 28 at 20:11
WormzyWormzy
91 bronze badge
1
Not sure what you are trying to do, but you should understand that preprocessor work is done before compilation or run time, so no compile or run time information is available to it.
– Eugene Sh.
Mar 28 at 20:14
1
The preprocessor doesn't work like that. Either have another macro (#define EXP_GPIO0_PORT_IS_PORTA 1, otherwise undefiend) or do it at runtime
– Artyer
Mar 28 at 20:14
ifPORTAis defined by another macro as an integer it works... preprocessor can only compare integers.
– Jean-François Fabre♦
Mar 28 at 20:24
can't compare two constants that are equal in preprocessor ? all expressions are constants. "PORTA" in that case is just a constant address. Both sides are same expression. Can't be at runtime, I need to optimize it as much as possible and preferably scalable...
– Wormzy
Mar 28 at 20:26
add a comment
|
I'm trying to define an array with preprocessor directives to have variable size. This array is filled depending of #define :
#define PORTA (*(PORT_t *) 0x0400)
#define EXP_GPIO0_PORT PORTA
#define EXP_GPIO0_PIN 0
I want to fill the array with :
const uint8_t PortAGpiosPortpinUsed[] =
#if EXP_GPIO0_PORT == PORTA
EXP_GPIO0_PIN,
#endif
As PORTA is a pointer, the compiler (GCC) doesn't allow this preprocessor syntax. Is there any solution to get it working ?
Thanks
Syl
c pointers directive string-comparison preprocessor
asked Mar 28 at 20:11
WormzyWormzy
91 bronze badge
I'm trying to define an array with preprocessor directives to have variable size. This array is filled depending of #define :
#define PORTA (*(PORT_t *) 0x0400)
#define EXP_GPIO0_PORT PORTA
#define EXP_GPIO0_PIN 0
I want to fill the array with :
const uint8_t PortAGpiosPortpinUsed[] =
#if EXP_GPIO0_PORT == PORTA
EXP_GPIO0_PIN,
#endif
As PORTA is a pointer, the compiler (GCC) doesn't allow this preprocessor syntax. Is there any solution to get it working ?
Thanks
Syl
c pointers directive string-comparison preprocessor
c pointers directive string-comparison preprocessor
asked Mar 28 at 20:11
WormzyWormzy
91 bronze badge
asked Mar 28 at 20:11
WormzyWormzy
91 bronze badge
asked Mar 28 at 20:11
WormzyWormzy
91 bronze badge
asked Mar 28 at 20:11
WormzyWormzy
91 bronze badge
asked Mar 28 at 20:11
WormzyWormzy
91 bronze badge
91 bronze badge
1
Not sure what you are trying to do, but you should understand that preprocessor work is done before compilation or run time, so no compile or run time information is available to it.
– Eugene Sh.
Mar 28 at 20:14
1
The preprocessor doesn't work like that. Either have another macro (#define EXP_GPIO0_PORT_IS_PORTA 1, otherwise undefiend) or do it at runtime
– Artyer
Mar 28 at 20:14
ifPORTAis defined by another macro as an integer it works... preprocessor can only compare integers.
– Jean-François Fabre♦
Mar 28 at 20:24
can't compare two constants that are equal in preprocessor ? all expressions are constants. "PORTA" in that case is just a constant address. Both sides are same expression. Can't be at runtime, I need to optimize it as much as possible and preferably scalable...
– Wormzy
Mar 28 at 20:26
add a comment
|
1
Not sure what you are trying to do, but you should understand that preprocessor work is done before compilation or run time, so no compile or run time information is available to it.
– Eugene Sh.
Mar 28 at 20:14
1
The preprocessor doesn't work like that. Either have another macro (#define EXP_GPIO0_PORT_IS_PORTA 1, otherwise undefiend) or do it at runtime
– Artyer
Mar 28 at 20:14
ifPORTAis defined by another macro as an integer it works... preprocessor can only compare integers.
– Jean-François Fabre♦
Mar 28 at 20:24
can't compare two constants that are equal in preprocessor ? all expressions are constants. "PORTA" in that case is just a constant address. Both sides are same expression. Can't be at runtime, I need to optimize it as much as possible and preferably scalable...
– Wormzy
Mar 28 at 20:26
1
1
Not sure what you are trying to do, but you should understand that preprocessor work is done before compilation or run time, so no compile or run time information is available to it.
– Eugene Sh.
Mar 28 at 20:14
Not sure what you are trying to do, but you should understand that preprocessor work is done before compilation or run time, so no compile or run time information is available to it.
– Eugene Sh.
Mar 28 at 20:14
1
1
The preprocessor doesn't work like that. Either have another macro (
#define EXP_GPIO0_PORT_IS_PORTA 1, otherwise undefiend) or do it at runtime– Artyer
Mar 28 at 20:14
The preprocessor doesn't work like that. Either have another macro (
#define EXP_GPIO0_PORT_IS_PORTA 1, otherwise undefiend) or do it at runtime– Artyer
Mar 28 at 20:14
if
PORTA is defined by another macro as an integer it works... preprocessor can only compare integers.– Jean-François Fabre♦
Mar 28 at 20:24
if
PORTA is defined by another macro as an integer it works... preprocessor can only compare integers.– Jean-François Fabre♦
Mar 28 at 20:24
can't compare two constants that are equal in preprocessor ? all expressions are constants. "PORTA" in that case is just a constant address. Both sides are same expression. Can't be at runtime, I need to optimize it as much as possible and preferably scalable...
– Wormzy
Mar 28 at 20:26
can't compare two constants that are equal in preprocessor ? all expressions are constants. "PORTA" in that case is just a constant address. Both sides are same expression. Can't be at runtime, I need to optimize it as much as possible and preferably scalable...
– Wormzy
Mar 28 at 20:26
add a comment
|
1 Answer
1
active
oldest
votes
Perhaps something like this would work:
#ifdef PORTA
#define ADDRESS (*(PORT_t *) 0x0400)
#define EXP_GPIO0_PORT ADDRESS
#define EXP_GPIO0_PIN 0
#endif
const uint8_t PortAGpiosPortpinUsed[] =
#ifdef PORTA
EXP_GPIO0_PIN,
#endif
Of course this expects that PORTA is previously defined
answered Mar 28 at 21:02
user3629249user3629249
12.2k1 gold badge11 silver badges16 bronze badges
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1 Answer
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Perhaps something like this would work:
#ifdef PORTA
#define ADDRESS (*(PORT_t *) 0x0400)
#define EXP_GPIO0_PORT ADDRESS
#define EXP_GPIO0_PIN 0
#endif
const uint8_t PortAGpiosPortpinUsed[] =
#ifdef PORTA
EXP_GPIO0_PIN,
#endif
Of course this expects that PORTA is previously defined
answered Mar 28 at 21:02
user3629249user3629249
12.2k1 gold badge11 silver badges16 bronze badges
add a comment
|
Perhaps something like this would work:
#ifdef PORTA
#define ADDRESS (*(PORT_t *) 0x0400)
#define EXP_GPIO0_PORT ADDRESS
#define EXP_GPIO0_PIN 0
#endif
const uint8_t PortAGpiosPortpinUsed[] =
#ifdef PORTA
EXP_GPIO0_PIN,
#endif
Of course this expects that PORTA is previously defined
answered Mar 28 at 21:02
user3629249user3629249
12.2k1 gold badge11 silver badges16 bronze badges
add a comment
|
Perhaps something like this would work:
#ifdef PORTA
#define ADDRESS (*(PORT_t *) 0x0400)
#define EXP_GPIO0_PORT ADDRESS
#define EXP_GPIO0_PIN 0
#endif
const uint8_t PortAGpiosPortpinUsed[] =
#ifdef PORTA
EXP_GPIO0_PIN,
#endif
Of course this expects that PORTA is previously defined
answered Mar 28 at 21:02
user3629249user3629249
12.2k1 gold badge11 silver badges16 bronze badges
Perhaps something like this would work:
#ifdef PORTA
#define ADDRESS (*(PORT_t *) 0x0400)
#define EXP_GPIO0_PORT ADDRESS
#define EXP_GPIO0_PIN 0
#endif
const uint8_t PortAGpiosPortpinUsed[] =
#ifdef PORTA
EXP_GPIO0_PIN,
#endif
Of course this expects that PORTA is previously defined
answered Mar 28 at 21:02
user3629249user3629249
12.2k1 gold badge11 silver badges16 bronze badges
answered Mar 28 at 21:02
user3629249user3629249
12.2k1 gold badge11 silver badges16 bronze badges
answered Mar 28 at 21:02
user3629249user3629249
12.2k1 gold badge11 silver badges16 bronze badges
answered Mar 28 at 21:02
user3629249user3629249
12.2k1 gold badge11 silver badges16 bronze badges
12.2k1 gold badge11 silver badges16 bronze badges
add a comment
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add a comment
|
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1
Not sure what you are trying to do, but you should understand that preprocessor work is done before compilation or run time, so no compile or run time information is available to it.
– Eugene Sh.
Mar 28 at 20:14
1
The preprocessor doesn't work like that. Either have another macro (
#define EXP_GPIO0_PORT_IS_PORTA 1, otherwise undefiend) or do it at runtime– Artyer
Mar 28 at 20:14
if
PORTAis defined by another macro as an integer it works... preprocessor can only compare integers.– Jean-François Fabre♦
Mar 28 at 20:24
can't compare two constants that are equal in preprocessor ? all expressions are constants. "PORTA" in that case is just a constant address. Both sides are same expression. Can't be at runtime, I need to optimize it as much as possible and preferably scalable...
– Wormzy
Mar 28 at 20:26