I²C stands for Inter-Integrated circuit, and is a data transferation system that allows connections between computers and low-level peripherals.
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Using the wiringPi I2C Library
I am trying to figure out how this library works (https://projects.drogon.net/raspberry-pi/wiringpi/i2c-library/) . Firstly, what is int fd that all the functions require. It is never stated. I can't ...
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How to get pin addresses on a MCP23017
Recently I purchased a few MCP23017. I've been reading up on them and I've gotten a few lights to turn on and such. I am having a problem trying to understand how to figure out the register address ...
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MMA8452 I2C module
I am working on Raspberry Pi Model B.
I am trying to interface this device over the I2C Bus on the Rpi.
My hardware Connections are:
RPi Accelerometer
Vcc P1_1 ...
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59 views
Detect version 1 or version 2 Pi
I'm writing a small application that could run on version one Pi ( mine ) or a version two ( co-workers ) that uses the I2C bus.
Since the I2C bus is different depending on the version, I was ...
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Converting two's complement hex values to binary using PHP
I'm reading x-axis accelerometer data from an IC via the I2C bus using I2C-Tools' ( specifically i2cget ) in Linux. Here is the code that is reading these values:
$OUT_X_L_A = shell_exec( 'i2cget -y ...
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How can I read and write data to a Character Device File in Linux with PHP?
I'm trying to read and write to modules on the I2C bus on a Raspberry Pi using PHP. I'm using fopen() and fskeek().
Below is the code I've been trying to use to read data coming in from the physical ...
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111 views
I2C: Raspberri pi as a Slave
I am trying to make two raspberry pi communicate through I2C protocol. I got little information that how I can code as a master in C using i2c-dev.h. So my question is how to make one of my raspberry ...
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Raspberry Pi on AVC-LAN / IEBus
I'm planning on using my Raspberry Pi in my car as an XBMC server. I'll be able to select songs/videos using the Android remote control app, but it occurred to me that it would be really neat if I ...
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Parallax L3G4200D reading from Pi
I am looking for information on how to setup the Parallax 3 axis Gyroscope with temperature module. I cant seem to find good documentation anywhere on how to get it working. The only thing I can find ...
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164 views
Connecting the HMC6352 compass module to a Raspi using I2C
I am trying to connect a HMC6352 compass module to my Raspberry Pi.
According to the datasheet I need to send an "A" for a read command. However, I am somewhat new to I2C and do not know how to ...
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129 views
Proven I2C sensors or expansion boards for RPI
Can someone point me to a good list of i2c sensors that will work with RPI - I am interested in pretty much any kind of them. Or perhaps there is an GPIO-mountable expansion board that I could use to ...
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I²C frequency changeable?
Is the I²C frequency meanwhile changeable? I read a few articles a while ago, that the frequency is not changeable.
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Couldnt get any value from accelerometer
I am using accelerometer MMA766 to read values. Used the following commands
root@raspberrypi:/home/pi# i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- ...
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Xenomai RTDM Skins for I2C, SPI
In another post I read that Xenomai could be used for real-time tasks like control loops.
I'd need to implement a real-time task which also talks to I2C and SPI. In this mailing list message I read ...
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246 views
PREEMPT_RT and RPi Drivers
I'm planning to do some realtime control loop tasks with the RPi. In this post PREEMPT_RT and Xenomai were proposed. I'm thinking about trying PREEMPT_RT, as I'd like to keep it as simple as possible.
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