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Add a new macro PROGMEM_STRING that can be used to define a constant string in program memory.

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This is a partial workaround for not being able to use PSTR at global scope, e.g. in an argument to a constructor; it makes the intent of the otherwise somewhat bulky declaration of the string more obvious.

git-svn-id: https://arducopter.googlecode.com/svn/trunk@1464 f9c3cf11-9bcb-44bc-f272-b75c42450872
This commit is contained in:
DrZiplok@gmail.com 2011-01-10 01:42:59 +00:00
parent afc68ba45c
commit adb54428da
1 changed files with 9 additions and 0 deletions
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9
libraries/AP_Common/AP_Common.h
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@ -68,9 +68,18 @@
#endif
//@}
///
/// @name Macros
/// @{
/// Define a constant string in program memory. This is a little more obvious
/// and less error-prone than typing the declaration out by hand. It's required
/// when passing PROGMEM strings to static object constructors because the PSTR
/// hack can't be used at global scope.
///
#define PROGMEM_STRING(_v, _s) static const char _v[] PROGMEM = _s
#define ToRad(x) (x*0.01745329252) // *pi/180
#define ToDeg(x) (x*57.2957795131) // *180/pi
// @}