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spi_flash_write_encrypted: Allow 16-byte aligned block writes

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As each 32 byte write has two identical 16 byte AES blocks, it's
possible to write them separately.
This commit is contained in:
Angus Gratton
2017-01-04 17:53:15 +11:00
committed by Ivan Grokhotkov
parent 36ccdee6ec
commit adc590ff69
3 changed files with 140 additions and 19 deletions
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14
components/spi_flash/include/esp_spi_flash.h
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@@ -92,14 +92,16 @@ esp_err_t spi_flash_write(size_t dest_addr, const void *src, size_t size);
*
* @note Flash encryption must be enabled for this function to work.
*
* @note Address in flash, dest, has to be 32-byte aligned.
* @note Destination flash address and length must be 16-byte
* aligned. Due to hardware limitations, this function is more
* efficient if both these arguments are 32-byte aligned. This is
* because the encryption engine natively deals with 32-byte rows of
* two AES blocks. Writing half a row (16 bytes) requires reading out
* the other 16 bytes and re-encrypting them back to the same value.
*
* @note If source address is in DROM, this function will return
* ESP_ERR_INVALID_ARG.
*
* @param dest_addr destination address in Flash. Must be a multiple of 32 bytes.
* @param dest_addr destination address in Flash. Must be a multiple of 16 bytes.
* @param src pointer to the source buffer.
* @param size length of data, in bytes. Must be a multiple of 32 bytes.
* @param size length of data, in bytes. Must be a multiple of 16 bytes.
*
* @return esp_err_t
*/