Arduino: no support for external flash?

[fredericplante]

It's very nice to have SPIFFS library to access the "internal flash" but it would be nice to have support external flash chip also.

[igrr]

You mean this library? https://github.com/PaulStoffregen/SerialFlash

[fredericplante]

Yeah there is this guy, how ever, it's not compatible with the ESP. this guy work for teensy and a little bit for arduino board, but only work for AVR and not ARM structure.

Basically seem to have incompatibility with the SPI library and something about 16bit transfer.

I can send you all the error message, if you want.

[fredericplante]

Using the CopyfromSD example

Arduino: 1.6.5 (Windows XP), Board: "Generic ESP8266 Module, 80 MHz, 40MHz, DIO, 115200, 512K (64K SPIFFS), ck, Disabled, None"

Build options changed, rebuilding all

C:\Documents and Settings\gust\My Documents\Arduino\libraries\SerialFlash\SerialFlashChip.cpp: In static member function 'static void SerialFlashChip::read(uint32_t, void*, uint32_t)':
C:\Documents and Settings\gust\My Documents\Arduino\libraries\SerialFlash\SerialFlashChip.cpp:169:28: error: no matching function for call to 'SPIClass::transfer(uint8_t*&, uint32_t&)'
   SPIPORT.transfer(p, rdlen);
                            ^
C:\Documents and Settings\gust\My Documents\Arduino\libraries\SerialFlash\SerialFlashChip.cpp:169:28: note: candidate is:
In file included from C:\Documents and Settings\gust\My Documents\Arduino\libraries\SerialFlash\SerialFlash.h:32:0,
                 from C:\Documents and Settings\gust\My Documents\Arduino\libraries\SerialFlash\SerialFlashChip.cpp:28:
C:\Documents and Settings\gust\Application Data\Arduino15\packages\esp8266\hardware\esp8266\2.3.0-rc1\libraries\SPI/SPI.h:64:11: note: uint8_t SPIClass::transfer(uint8_t)
   uint8_t transfer(uint8_t data);
           ^
C:\Documents and Settings\gust\Application Data\Arduino15\packages\esp8266\hardware\esp8266\2.3.0-rc1\libraries\SPI/SPI.h:64:11: note:   candidate expects 1 argument, 2 provided


Error compiling.

  This report would have more information with
  "Show verbose output during compilation"
  enabled in File > Preferences.

[igrr]

1st error — change type of rdlen from unsigned long to unsigned or uint32_t. This is a bug in the example, function argument is declared as uint32_t and this is not the same as unsigned long (size is the same, types are different).

2nd error — add one line to esp8266/libraries/SPI/SPI.h:

void transfer(void *_buf, size_t count) { writeBytes((uint8_t*) _buf, (size_t) count); }

[fredericplante]

It did the trick. Thank you. :)

Sketch uses 236,941 bytes (54%) of program storage space. Maximum is 434,160 bytes.
Global variables use 32,712 bytes (39%) of dynamic memory, leaving 49,208 bytes for local variables. Maximum is 81,920 bytes.

[fredericplante]

I don't want to be annoying :D But the lisfile example return this:

ListFiles.ino: In function 'void setup()':
ListFiles:31: error: no matching function for call to 'SerialFlashChip::readdir(char [64], unsigned int, long unsigned int&)'
ListFiles.ino:31:65: note: candidate is:
In file included from ListFiles.ino:1:0:
C:\Documents and Settings\gust\My Documents\Arduino\libraries\SerialFlash/SerialFlash.h:67:14: note: static bool SerialFlashChip::readdir(char*, uint32_t, uint32_t&)
static bool readdir(char *filename, uint32_t strsize, uint32_t &filesize);
^
C:\Documents and Settings\gust\My Documents\Arduino\libraries\SerialFlash/SerialFlash.h:67:14: note: no known conversion for argument 3 from 'long unsigned int' to 'uint32_t& {aka unsigned int&}'

I guess this library will be fully compatible once this is settle. Except for the MP3 part, but hey!

[fredericplante]

Forget about it, All is good, I updated your esp platform, and I forgot to fix the SPI.h thing, so it made problem in the other example listfile thing..

Thank you!