diff options
| author | Damien George <damien@micropython.org> | 2020-12-17 16:59:54 +1100 |
|---|---|---|
| committer | Damien George <damien@micropython.org> | 2020-12-18 13:39:32 +1100 |
| commit | e43a74a4db484ac1bfef191a8aa19b58b519efc6 (patch) | |
| tree | bc8176ff47db092ff8dd88a1e80c3c5df08a94ab /drivers | |
| parent | 061cb1a73a4ecbf69a4e036053664b4f84754b34 (diff) | |
drivers/memory/spiflash: Add MICROPY_HW_SPIFLASH_ENABLE_CACHE option.
This only needs to be enabled if a board uses FAT FS on external SPI flash.
When disabled (and using external SPI flash) 4k of RAM can be saved.
Signed-off-by: Damien George <damien@micropython.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/memory/spiflash.c | 4 | ||||
| -rw-r--r-- | drivers/memory/spiflash.h | 6 |
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/memory/spiflash.c b/drivers/memory/spiflash.c index e870d39f5..bb15bd625 100644 --- a/drivers/memory/spiflash.c +++ b/drivers/memory/spiflash.c @@ -287,6 +287,8 @@ int mp_spiflash_write(mp_spiflash_t *self, uint32_t addr, size_t len, const uint /******************************************************************************/ // Interface functions that use the cache +#if MICROPY_HW_SPIFLASH_ENABLE_CACHE + void mp_spiflash_cached_read(mp_spiflash_t *self, uint32_t addr, size_t len, uint8_t *dest) { if (len == 0) { return; @@ -509,3 +511,5 @@ int mp_spiflash_cached_write(mp_spiflash_t *self, uint32_t addr, size_t len, con mp_spiflash_release_bus(self); return 0; } + +#endif // MICROPY_HW_SPIFLASH_ENABLE_CACHE diff --git a/drivers/memory/spiflash.h b/drivers/memory/spiflash.h index 96dfdeeab..c4162ff21 100644 --- a/drivers/memory/spiflash.h +++ b/drivers/memory/spiflash.h @@ -38,6 +38,7 @@ enum { struct _mp_spiflash_t; +#if MICROPY_HW_SPIFLASH_ENABLE_CACHE // A cache must be provided by the user in the config struct. The same cache // struct can be shared by multiple SPI flash instances. typedef struct _mp_spiflash_cache_t { @@ -45,6 +46,7 @@ typedef struct _mp_spiflash_cache_t { struct _mp_spiflash_t *user; // current user of buf, for shared use uint32_t block; // current block stored in buf; 0xffffffff if invalid } mp_spiflash_cache_t; +#endif typedef struct _mp_spiflash_config_t { uint32_t bus_kind; @@ -59,7 +61,9 @@ typedef struct _mp_spiflash_config_t { const mp_qspi_proto_t *proto; } u_qspi; } bus; + #if MICROPY_HW_SPIFLASH_ENABLE_CACHE mp_spiflash_cache_t *cache; // can be NULL if cache functions not used + #endif } mp_spiflash_config_t; typedef struct _mp_spiflash_t { @@ -75,9 +79,11 @@ int mp_spiflash_erase_block(mp_spiflash_t *self, uint32_t addr); void mp_spiflash_read(mp_spiflash_t *self, uint32_t addr, size_t len, uint8_t *dest); int mp_spiflash_write(mp_spiflash_t *self, uint32_t addr, size_t len, const uint8_t *src); +#if MICROPY_HW_SPIFLASH_ENABLE_CACHE // These functions use the cache (which must already be configured) void mp_spiflash_cache_flush(mp_spiflash_t *self); void mp_spiflash_cached_read(mp_spiflash_t *self, uint32_t addr, size_t len, uint8_t *dest); int mp_spiflash_cached_write(mp_spiflash_t *self, uint32_t addr, size_t len, const uint8_t *src); +#endif #endif // MICROPY_INCLUDED_DRIVERS_MEMORY_SPIFLASH_H |