54 lines
2.0 KiB
Markdown
54 lines
2.0 KiB
Markdown
# Arduino IDE ESP8266 - library for SPI Serial SRam 23A1024/23LC1024 by Microchip Technology Inc.
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This Library provides the interface for a 1Mbit SRAM chip
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with ESP8266 through SPI connection.
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Microchip 23A1024/23LC1024 - [download datasheet here](http://ww1.microchip.com/downloads/en/DeviceDoc/20005142C.pdf)
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Application written by [Giancarlo Bacchio](bacchio.giancarlo@gmail.com)
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## Getting the code
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You can install SRam Library for your ESP8266 downloading the code that is hosted at https://github.com/Gianbacchio/ESP8266_Spiram.
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Selecting "Watch" box in the GitHub repository, you will be informed about the latest development updates of this library.
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## Installing the code
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The downloaded code in *.zip format can be included as a new library into the IDE, selecting the menù:
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Sketch / include Library / Add .Zip library
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## Usage
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The Hardware connection is done using the standard HSPI interface of the ESP8266.
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The chip is connected as per para 3.8 "SPI/SDI and SQI Pin designation" (see datasheet)
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Power supply is 3,3Vcc.
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Pin on RAM chip | functionality | Pin on ESP8266
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----------------|---------------|----------------
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pin1 | C/S | GPIO15
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pin2 | MISO | GPIO12
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pin3 | N/C | Gnd
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pin4 | Vss | Gnd
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pin5 | MOSI | GPIO13
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pin6 | SCK | GPIO14
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pin7 | HOLD | V+
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pin8 | Vcc | V+
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## Examples
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- ESP_spiram.ino : a basic example to understand how the library works. You can write and read a Byte in a given location of the SRAM
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## License
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You may copy, distribute and modify the software provided that modifications are described and licensed for free under [LGPL-3](http://www.gnu.org/licenses/lgpl-3.0.html). Derivatives works (including modifications or anything statically linked to the library) can only be redistributed under [LGPL-3](http://www.gnu.org/licenses/lgpl-3.0.html), but applications that use the library don't have to be.
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