ESP-WROOM-32 and extending the flash

sorenhl
Posts: 20
Joined: Sun Jun 03, 2018 9:34 pm

ESP-WROOM-32 and extending the flash

Postby sorenhl » Sun Jun 17, 2018 7:23 am

Hi,

I a am quite new to this, so I apologize if my question seems to be common knowledge.

I am currently in the making of a project, but I discovered that I had too little storage available for the application thus I want to run the program from an external flash and burn the efuses.

As I still want to use JTAG, I am planning to boot from VSPI, are there any downsides when doing this?

I have found the 16MB flash chip named W25Q128FV, can anybody confirm that this is suitable? And I read there are different flash modes, does this support qio?

If you recommend any other type of chip please let me know as I am really inexperienced in this area :)

/Søren

sorenhl
Posts: 20
Joined: Sun Jun 03, 2018 9:34 pm

Re: ESP-WROOM-32 and extending the flash

Postby sorenhl » Wed Jun 20, 2018 7:59 pm

Still waiting for the flash chips to arrive, but reading their documentation they seem to be doing quo just fine.

Now if anybody have any experience with this flash, especially regarding stability, downsides, etc., I would really love to hear it.

Otherwise I will ofcourse be updating this thread with my findings when I get to play with it.

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loboris
Posts: 467
Joined: Wed Dec 21, 2016 7:40 pm

Re: ESP-WROOM-32 and extending the flash

Postby loboris » Thu Jun 21, 2018 8:07 am

I have replaced the original Flash chip with W25Q128FV on several ESP-WROM-32 modules and it works without any issue (QIO mode/80 MHz).
I don't see any reason why it shouldn't work as external Flash also.

By the way, it is easy to add the SPI-RAM to.
Image

ESP-WROOM-32 modules with 8 MB and 16 MB Flash are now available (as well as ESP32-Wrover modules), so there is not much need for adding the external flash chip.

dmaxben
Posts: 30
Joined: Thu Nov 16, 2017 6:04 pm

Re: ESP-WROOM-32 and extending the flash

Postby dmaxben » Thu Jun 21, 2018 7:02 pm

loboris wrote: ESP-WROOM-32 modules with 8 MB and 16 MB Flash are now available (as well as ESP32-Wrover modules), so there is not much need for adding the external flash chip.
Very cool! Ive been waiting for someone to make custom WROOM32 with 16MB of flash, that is also FCC certified with the metal RF shield.

AnalogLamb has had the 16MB WROOM32 modules for a little while, but they did not have the metal RF shield or the FCC compliance marking.

Any tips on re-configuring the Arduino IDE to recognize/utilize the larger 16MB flash? Once you have made the changes in the appropriate files, can you still flash right from the Arduino IDE? Or do you have to flash from the ESP python script due to the extra flash memory?

Deouss
Posts: 278
Joined: Tue Mar 20, 2018 11:36 am

Re: ESP-WROOM-32 and extending the flash

Postby Deouss » Sun Jun 24, 2018 11:32 am

loboris wrote:
ESP-WROOM-32 modules with 8 MB and 16 MB Flash are now available (as well as ESP32-Wrover modules), so there is not much need for adding the external flash chip.
How about WROVER pcbs to mount the modules?
Best would be with uart bridge.
Where can I get them cheap?

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loboris
Posts: 467
Joined: Wed Dec 21, 2016 7:40 pm

Re: ESP-WROOM-32 and extending the flash

Postby loboris » Sun Jun 24, 2018 3:25 pm

AnalogLamb has ESP32-WROVER Breakout Board for 1.99 US$, but without USB2UART chip, and ESP32 Fixer Board for ESP32-WROVER, but it is not cheap (18.88 US$).

sorenhl
Posts: 20
Joined: Sun Jun 03, 2018 9:34 pm

Re: ESP-WROOM-32 and extending the flash

Postby sorenhl » Tue Jun 26, 2018 8:52 pm

Thank you all for the great responses, both regarding the confirmation of W25Q128FV and the tip about purchasing with custom flash size.

Decision:
I have decided upon configuring the flash externally as intended initially, simply because I need to be sure that I can obtain the ESP-WROOM-32 and the flash for the factory and I do not have a large enough production to order 5000+ pcs directly from espressif, so I do not want to rely my whole production line on custom built modules (even through it is proberly quite safe). I am not creating that small of a product either, so adding the flash to the PCB was not an issue.

Testing:
I have now received my flash and it simply just works :)

I first tried to flash it using the argument "--spi-connection 18,19,23,4,5" for VSPI which detects the 16MB and flashes the chip but it did not boot on it. I used this to confirm my pins and flash worked as intended.

I then burned the efuses which did so it now boots perfectly with the 16MB:

Code: Select all

./espefuse.py --port /dev/ttyS2 burn_efuse SPI_PAD_CONFIG_CLK 18
./espefuse.py --port /dev/ttyS2 burn_efuse SPI_PAD_CONFIG_Q 19
./espefuse.py --port /dev/ttyS2 burn_efuse SPI_PAD_CONFIG_D 23
./espefuse.py --port /dev/ttyS2 burn_efuse SPI_PAD_CONFIG_HD 4
./espefuse.py --port /dev/ttyS2 burn_efuse SPI_PAD_CONFIG_CS0 5
Finally i increased the sizes of my partitions and everything is running smoothly :)

/Søren

japsvilla
Posts: 2
Joined: Thu Aug 30, 2018 10:38 am

Re: ESP-WROOM-32 and extending the flash

Postby japsvilla » Thu Aug 30, 2018 10:56 am

Hi sorenhl, sorry for asking but I have some problems to implement your solution,
I burned the efuses to 18,19,23,21,5 for VSPI (4 for SPIHD is not for HSPI?) and now I can flash in DIO mode
(I flashed the hello world example), but in QIO I get an error message after flashing:

rst:0x3 (SW_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 353727698, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3fff0018,len:4
load:0x3fff001c,len:6368
ho 0 tail 12 room 4
load:0x40078000,len:10116
load:0x40080400,len:6840
entry 0x40080768

I (31) boot: ESP-IDF v3.2-dev-518-g020ade65 2nd stage bootloader
I (31) boot: compile time 11:25:36
I (31) boot: Enabling RNG early entropy source...
I (37) qio_mode: Enabling QIO for flash chip ISSI
I (43) boot: SPI Speed : 40MHz
I (47) boot: SPI Mode : QOUT
I (51) boot: SPI Flash Size : 16MB
E (55) flash_parts: partition 0 invalid magic number 0x10ee
E (61) boot: Failed to verify partition table
E (66) boot: load partition table error!

And then reboots again and again

How did you flashed it? I changed the WP pin option in make menuconfig menu to "22"
but I dont know if i'm doing it wrong or something.

Thank you all.

PD: My flash is an IS25WP128F

markwj
Posts: 84
Joined: Tue Mar 08, 2016 5:03 am

Re: ESP-WROOM-32 and extending the flash

Postby markwj » Fri Aug 31, 2018 12:19 am

We wasted about a year with external flash. It works ok on WROOM32 (in DIO mode), but just too much trouble on WROVER32 (due to no spare 1.8v GPIO for CS, 1.8v not exposed externally, level shifting, hard-coded firmware not supporting it, etc).

My recommendation is to use modules with 16MB flash already onboard. They are generally available from several sources now. We've had zero problems with this since we moved to 16MB onboard WROVER32 modules.

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