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spi_flash: add configuration option to select flash write chunk size

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Flash write operation is broken down into smaller chunk writes. Size
of this chunk was previously set to 8K but that in-turn meant cache and
non-IRAM resident interrupts could stay disabled upto ~24msec for 8K flash
write operation. If chunk size is brought down to 256 (typical flash page size)
then it brings down cache and non-IRAM interrupts disable duration to ~1msec.

Fix here keeps defaults same but provides configuration option to tweak the
setting based on application requirement.
This commit is contained in:
Mahavir Jain
2020-06-04 14:51:34 +05:30
parent c1bbc94e9d
commit 05da91f0db
3 changed files with 20 additions and 0 deletions
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5
components/spi_flash/flash_ops.c
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@@ -53,7 +53,12 @@ esp_rom_spiflash_result_t IRAM_ATTR spi_flash_write_encrypted_chip(size_t dest_a
/* Limit number of bytes written/read in a single SPI operation,
as these operations disable all higher priority tasks from running.
*/
#ifdef CONFIG_SPI_FLASH_WRITE_CHUNK_SIZE
#define MAX_WRITE_CHUNK CONFIG_SPI_FLASH_WRITE_CHUNK_SIZE
#else
#define MAX_WRITE_CHUNK 8192
#endif // CONFIG_SPI_FLASH_WRITE_CHUNK_SIZE
#define MAX_READ_CHUNK 16384
static const char *TAG __attribute__((unused)) = "spi_flash";