ESP8266 Developer Zone The Official ESP8266 Forum 2015-10-14T17:24:04+08:00 https://bbs.espressif.com:443/feed.php?f=6&t=1191 2015-10-14T17:24:04+08:00 2015-10-14T17:24:04+08:00 https://bbs.espressif.com:443/viewtopic.php?t=1191&p=4106#p4106 <![CDATA[Re: Bad FLASH allocation ?]]>
Please be noted that external spi flash is connected to ESP8266EX through SPI interface, not SDIO interface.
Thus, there is no correspondence as the name of the pin indicated.
The right relation between flash and ESP8266EX is as shown below.
1.png


Any more questions, please let us know.

Thanks.

Statistics: Posted by Espressif_Kelly — Wed Oct 14, 2015 5:24 pm

]]> 2015-10-05T21:24:47+08:00 2015-10-05T21:24:47+08:00 https://bbs.espressif.com:443/viewtopic.php?t=1191&p=3989#p3989 <![CDATA[Bad FLASH allocation ?]]>
I have the kit of development olimex and I have a question as regards the pinout between the ESP8266 and the flash memory.
They use QUAD SPI protocol.

Here we have schematic :

http://www.google.fr/imgres?imgurl=http%3A%2F%2F41j.com%2Fblog%2Fwp-content%2Fuploads%2F2015%2F01%2Folimex_esp8266.png&imgrefurl=http%3A%2F%2F41j.com%2Fblog%2F2015%2F01%2Folimex-esp8266-pcb-schematicslayout%2F&h=596&w=891&tbnid=Gd-xlClXjs8O0M%3A&docid=CtNF_N8QF_yGwM&ei=n3cSVtjpKIqzUd-FjtgD&tbm=isch&iact=rc&uact=3&dur=1270&page=1&start=0&ndsp=23&ved=0CCcQrQMwAmoVChMImLXAzrSryAIVilkUCh3fggM7

If we get back the datasheet of the flash memory W25Q16, we notice, for SQI protocol the pinout is the following one:

Pin 5: IO0 data input / output 0
pin 2: IO1 data input / output 1
pin 3: IO2 data input / output 2
pin 7: IO3 data input / output 3

We observe not at all this allowance on evaluation kit and I do not understand how we can FLASH with this allowance (D0 (uC) == > D1 (flash); D1 (uC) == > D0 (Flash); D2 (uC) == > D3 (flash); D3 (Uc) == > D2 (flash) ....) It's rubbish not?

Thank you in advance for clarification on this point

Statistics: Posted by David.M — Mon Oct 05, 2015 9:24 pm

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