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Unaligned access support for pgm_read_word/dword (#5692)

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* Unaligned access support for pgm_read_word/dword

* Fix pgm_read_ptr_aligned() per #5735

* Allow users to use aligned-only via a #define

Adding -DPGM_READ_UNALIGNED=0 or #define PGM_READ_UNALIGNED 0 will
change the default at compile-time to only aligned (faster, but less
compatible) macro implementations.

Default is still to allow unaligned accesses.
This commit is contained in:
Earle F. Philhower, III
2019-04-11 22:24:49 +03:00
committed by GitHub
parent 882d5ba422
commit 885276e75c
2 changed files with 51 additions and 10 deletions
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4
tests/host/sys/pgmspace.h
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@ -31,13 +31,13 @@
#define pgm_read_word(addr) (*reinterpret_cast<const uint16_t*>(addr))
#define pgm_read_dword(addr) (*reinterpret_cast<const uint32_t*>(addr))
#define pgm_read_float(addr) (*reinterpret_cast<const float>(addr))
#define pgm_read_ptr(addr) (*reinterpret_cast<const void const *>(addr))
#define pgm_read_ptr(addr) (*reinterpret_cast<const void* const *>(addr))
#else
#define pgm_read_byte(addr) (*(const uint8_t*)(addr))
#define pgm_read_word(addr) (*(const uint16_t*)(addr))
#define pgm_read_dword(addr) (*(const uint32_t*)(addr))
#define pgm_read_float(addr) (*(const float)(addr))
#define pgm_read_ptr(addr) (*(const void const *)(addr))
#define pgm_read_ptr(addr) (*(const void* const *)(addr))
#endif
#define pgm_read_byte_near(addr) pgm_read_byte(addr)