81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
#ifndef __INC_FL_PROGMEM_H
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#define __INC_FL_PROGMEM_H
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#include "FastLED.h"
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///@file fastled_progmem.h
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/// wrapper definitions to allow seamless use of PROGMEM in environmens that have it
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FASTLED_NAMESPACE_BEGIN
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// Compatibility layer for devices that do or don't
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// have "PROGMEM" and the associated pgm_ accessors.
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//
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// If a platform supports PROGMEM, it should define
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// "FASTLED_USE_PROGMEM" as 1, otherwise FastLED will
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// fall back to NOT using PROGMEM.
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//
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// Whether or not pgmspace.h is #included is separately
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// controllable by FASTLED_INCLUDE_PGMSPACE, if needed.
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// If FASTLED_USE_PROGMEM is 1, we'll map FL_PROGMEM
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// and the FL_PGM_* accessors to the Arduino equivalents.
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#if FASTLED_USE_PROGMEM == 1
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#ifndef FASTLED_INCLUDE_PGMSPACE
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#define FASTLED_INCLUDE_PGMSPACE 1
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#endif
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#if FASTLED_INCLUDE_PGMSPACE == 1
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#include <avr/pgmspace.h>
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#endif
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#define FL_PROGMEM PROGMEM
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// Note: only the 'near' memory wrappers are provided.
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// If you're using 'far' memory, you already have
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// portability issues to work through, but you could
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// add more support here if needed.
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#define FL_PGM_READ_BYTE_NEAR(x) (pgm_read_byte_near(x))
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#define FL_PGM_READ_WORD_NEAR(x) (pgm_read_word_near(x))
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#define FL_PGM_READ_DWORD_NEAR(x) (pgm_read_dword_near(x))
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// Workaround for http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34734
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#if __GNUC__ < 4 || (__GNUC__ == 4 && (__GNUC_MINOR__ < 6))
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#ifdef FASTLED_AVR
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#ifdef PROGMEM
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#undef PROGMEM
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#define PROGMEM __attribute__((section(".progmem.data")))
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#endif
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#endif
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#endif
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#else
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// If FASTLED_USE_PROGMEM is 0 or undefined,
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// we'll use regular memory (RAM) access.
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//empty PROGMEM simulation
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#define FL_PROGMEM
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#define FL_PGM_READ_BYTE_NEAR(x) (*((const uint8_t*)(x)))
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#define FL_PGM_READ_WORD_NEAR(x) (*((const uint16_t*)(x)))
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#define FL_PGM_READ_DWORD_NEAR(x) (*((const uint32_t*)(x)))
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#endif
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// On some platforms, most notably ARM M0, unaligned access
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// to 'PROGMEM' for multibyte values (eg read dword) is
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// not allowed and causes a crash. This macro can help
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// force 4-byte alignment as needed. The FastLED gradient
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// palette code uses 'read dword', and now uses this macro
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// to make sure that gradient palettes are 4-byte aligned.
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#ifdef FASTLED_ARM
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#define FL_ALIGN_PROGMEM __attribute__ ((aligned (4)))
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#else
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#define FL_ALIGN_PROGMEM
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#endif
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FASTLED_NAMESPACE_END
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#endif
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