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README
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Arduino Si4737 I2C Library, adapted from Radu - Eosif Mihailescu (https://github.com/csdexter/Si4735).
See below for more details.
This code is for the Si4737 breakout board made by Alex_K (http://forum.arduino.cc/index.php?topic=145187.msg1420076#msg1420076) of Arudino forums
I could not get the Si4735 library to work with my board, so I figured I'd start from blank. Anything and everything concerning SPI has been removed. An example is available.
=== Hardware Notes ===
* Quick connection reference:
I2C Mode, Si4735 -> Arduino:
SDIO -> SDA (Arduino bidirectional)
SCLK -> SCL (Arduino output)
#RESET -> D9 (Arduino output)
I don't know what those are:
#SEN -> tied high or low, tell the code which one with
SI4735_PIN_SEN_HW*
GPO1 -> left floating
GPO2/#INT -> D2/INT0 (Arduino input)
or (left floating or tied high, if not using interrupts)
Original README:
Arduino Si4735 (and family) Library
Written by Ryan Owens for SparkFun Electronics on 5/17/2011
Altered by Wagner Sartori Junior <[email protected]> on 9/13/2011
Actively being developed by Jon Carrier <[email protected]>
Refactoring, cosmetic changes and I2C mode by Radu - Eosif Mihailescu <[email protected]> 3/29/2012
Painstaking hardware testing by Todd Scott Canaday <[email protected]> 4/03/2012
I2C bug fixes pointed out by Ray Dees 4/03/2012
Bug spotting in begin() -> setMode() interaction by Albert Tejera 5/24/2012
This library is intended for use with the SparkFun Si4735 Shield or Breakout
Board, however it should work with most Si47xx chips that share the same command
language. At the time of this writing, the list includes: Si4700->Si4713,
Si4720, Si4721, Si4730, Si4731, Si4734->Si4749, Si4784 and Si4785.
Originally released under the 'Buy Me a Beer' license (if we ever meet, you
buy me a beer).
To the furthest extent that this is legally possible, the fork maintained by
Radu - Eosif Mihailescu and published here https://github.com/csdexter/Si4735
is hereby released under the LGPL version 3.
To the furthest extent that this is legally enforceable, the copyright remains
with the authors listed above.
See the example sketches to learn how to use the library in your code.
HARDWARE NOTES:
* The Si4735 is a 3.3V I/O chip whereas the Arduino Uno/Mega are 5V I/O. This
means you will need to use logic level shifters if you are trying to use
the Breakout Board version with the latter.
If you're using the Shield, you should be ok save for a few fatal design
mistakes SparkFun introduced. There are various hacks around to work around
those, my personal recommendation is that you go for a real level shifter.
Please note that BOB-08745 is cheaper than BOB-10403 mainly because it's a
lot slower. For casual applications speed shouldn't matter, but if you need
to push the SPI interface to its limit, go for the expensive version if you
need to translate between a 5V I/O Arduino and the Si4735.
* If you're using the Breakout Board, make sure you tell the code whether or
not you connected a 32768Hz oscillator to the RCLK and DCLK pins. See the
schematic for the Shield for reference.
* Quick connection reference:
SPI Mode, Si4735 -> Arduino:
SDIO -> MOSI (Arduino output)
GPO1 -> MISO (Arduino input)
SCLK -> SCK (Arduino output)
#SEN -> SS (Arduino output)
#RESET -> D9 (Arduino output)
GPO2/#INT -> D2/INT0 (Arduino bidirectional)
I2C Mode, Si4735 -> Arduino:
SDIO -> SDA (Arduino bidirectional)
SCLK -> SCL (Arduino output)
#SEN -> tied high or low, tell the code which one with
SI4735_PIN_SEN_HW*
#RESET -> D9 (Arduino output)
GPO1 -> left floating
GPO2/#INT -> D2/INT0 (Arduino input)
or (left floating or tied high, if not using interrupts)
For general questions and updates on this library please contact the fork
maintainer at <[email protected]>.