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pios_flashfs_logfs: moved modified ARENA and SLOT enums to an F3 branch

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also added a detailed comment
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lilvinz 2012-12-13 13:54:08 +01:00 committed by Alessio Morale
parent b242f8b88c
commit d611207789
1 changed files with 36 additions and 4 deletions
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40
flight/PiOS/Common/pios_flashfs_logfs.c
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@ -79,10 +79,26 @@ static uintptr_t logfs_get_addr(uint8_t arena_id, uint16_t slot_id)
* of earlier ones in NOR flash without an erase cycle.
*/
enum arena_state {
#ifdef STM32F30X
/*
* The STM32F30X flash subsystem is only capable of
* writing words or halfwords. In this case we use halfwords.
* In addition to that it is only capable to write to erased
* cells (0xffff) or write a cell from anything to (0x0000).
* To cope with this, the F3 gets different enum values.
* For this to work the underlying flash driver has to
* check each halfword if it has changed before writing.
*/
ARENA_STATE_ERASED = 0xFFFFFFFF,
ARENA_STATE_RESERVED = 0x5555FFFF,
ARENA_STATE_ACTIVE = 0x0000FFFF,
ARENA_STATE_RESERVED = 0xE6E6FFFF,
ARENA_STATE_ACTIVE = 0xE6E66666,
ARENA_STATE_OBSOLETE = 0x00000000,
#else
ARENA_STATE_ERASED = 0xEEEEEEEE,
ARENA_STATE_RESERVED = 0xE6E6E6E6,
ARENA_STATE_ACTIVE = 0x66666666,
ARENA_STATE_OBSOLETE = 0x44444444,
#endif
};
struct arena_header {
@ -304,10 +320,26 @@ static int32_t logfs_find_active_arena()
* of earlier ones in NOR flash without an erase cycle.
*/
enum slot_state {
#ifdef STM32F30X
/*
* The STM32F30X flash subsystem is only capable of
* writing words or halfwords. In this case we use halfwords.
* In addition to that it is only capable to write to erased
* cells (0xffff) or write a cell from anything to (0x0000).
* To cope with this, the F3 gets different enum values.
* For this to work the underlying flash driver has to
* check each halfword if it has changed before writing.
*/
SLOT_STATE_EMPTY = 0xFFFFFFFF,
SLOT_STATE_RESERVED = 0xAAAAFFFF,
SLOT_STATE_ACTIVE = 0x0000FFFF,
SLOT_STATE_RESERVED = 0xFAFAFFFF,
SLOT_STATE_ACTIVE = 0xFAFAAAAA,
SLOT_STATE_OBSOLETE = 0x00000000,
#else
SLOT_STATE_EMPTY = 0xFFFFFFFF,
SLOT_STATE_RESERVED = 0xFAFAFAFA,
SLOT_STATE_ACTIVE = 0xAAAAAAAA,
SLOT_STATE_OBSOLETE = 0x88888888,
#endif
};
struct slot_header {