OSError on large files

[maholli]

I've been using miniesptool with files on an SD card (too large for internal flash).

It usually works, but I've ran into:

Traceback (most recent call last):
  File "main.py", line 74, in <module>
  File "adafruit_miniesptool.py", line 423, in flash_file
  File "adafruit_miniesptool.py", line 410, in flash_file
OSError: [Errno 5] Input/output error

when the file is greater than ~1.5MB. The OSError: [Errno 5] appears to be generic. Line 410 where the error occurs is when CP tries to read file contents (after opening).

I've found that reducing the FLASH_WRITE_SIZE from 0x400 to 0x200 on

Adafruit_CircuitPython_miniesptool/adafruit_miniesptool.py

Line 104 in 0362c36

FLASH_WRITE_SIZE = 0x400

resolves my issue. I also tried adding a gc.collect() prior to the file.read() call, but that didn't seem to help.

[ladyada]

@maholli yeah this is a bug in the SD card library but im ok fixing it here for now - can you submit a PR?

[evaherrada]

@ladyada I'm not sure if this is still wanted, but since it was a really quick fix, I made a PR using the code that @maholli wrote.

[ladyada]

oh yeah that makes sense. thx!