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1. PI ARDUINO I2C EXAMPLE TWO WAY DATA WIRINGPI HOW TO
2. PI ARDUINO I2C EXAMPLE TWO WAY DATA WIRINGPI SERIAL
3. PI ARDUINO I2C EXAMPLE TWO WAY DATA WIRINGPI CODE

You cannot access the hardware from normal user-space programs, you need to go through kernel APIs and drivers. I think there might be some unfortunate expectations at play here: It's not as well integrated as Arduino's neat little IDE and library infrastructure, but it's not a huge deal to get some simple stuff working. It's been several years since I touched any of this, but I expect I found it by reading the main Pi forums and following links to the docs by the guy that did it. So it looks like the wiringPi stuff is what you need to talk to the Pi specific hardware. Gcc -g -lstdc++ -lwiringPi -o hih Read-hih-6130.o Here's the makefile: hih : Read-hih-6130.o

PI ARDUINO I2C EXAMPLE TWO WAY DATA WIRINGPI CODE

Looking at the C++ code for that Temperature/Humidity collection on the Pi, I see these headers: #include I used to collect temp/humidity data on an Arduino but when I upgraded my router, my old WiFi card couldn't manage the new security protocols so I transferred it to a Pi. It worked pretty well but it took several days to figure out all the GUI stuff. Actually, I think you can from Genie too, but I didn't. It's nicer than Genie (though rather more complex) and I can call the compiler from within it. I needed to write some GUI stuff and decided to use C# as a learning exercise so I installed VSCode. Until recently, I used Genie for all my editing and cc at the command line for compilation. When I want to write Linux code I generally use Perl for text stuff, C++ for heavier computation or GUI work and Python (although I loathe it) if someone else has already done 90% of what I'm looking for.

PI ARDUINO I2C EXAMPLE TWO WAY DATA WIRINGPI SERIAL

There are a few caveats and limitations because you are in a mutitasking environment and the timings are not guaranteed as if your processor were alone to do the job.*īut if I want to run a few analog measurements, a bit if PWM control, a few computations and show that on a I2C display, beside the other tasks that i'm already doing with Linux, why not do it on a side job of the Pi instead of running an extra Arduino hardware for it + serial interfacing with the Pi? But that does not mean that you cannot code a simple hardware-related app like you would with a microcontroller. Of course in a Linux-environment you have a whole new universe of possibilities and their related rules to lean.

PI ARDUINO I2C EXAMPLE TWO WAY DATA WIRINGPI HOW TO

My question is whether I'm missing something glaringly obvious (I'm relatively new to C and Arduino), and/or if I can get some pointers on how to troubleshoot this more looks like it is totally unsuitable because Linux is completely different and vastly more complex and powerful. The exact same effect happens if I pass in 511 or for that matter, any number as the data in the call. The problem is, is that the second byte is 0. However, in the second call to that function, I do get the correct output for the register (first byte as 0x01 = 1), but the second byte is zero, and the third byte has what appears to be the correct remainder (255 = one byte, + 1). The third byte ( 0) is meaningless from what I can tell (as I'm only sending in one byte as data).

In the first call to wiringPiI2CWriteReg16(), I expect the first byte in the output to be zero ( 0x00) as that's the register address I'm requesting. word, I receive the following on my Arduino's serial output: bytes in: 3 Nonetheless, I have this C code (requires wiringPi v2.36+ to be installed): // word.cĬompiled like this: gcc -o word word.c -lwiringPi I would think that Wire.read() would break things apart at the byte boundary, but that's not occurring in my case. Int data = Wire.read() // tried char, uint8_t etc On my Arduino (both an Uno R3 and a Trinket Pro), I am running this pared-down sketch: #include

There are notes within the wiringPiI2C.c file that state it resembles Linux's SMBus code, if that helps. This is the declaration for the function: extern int wiringPiI2CWriteReg16 (int fd, int reg, int data)

I'm experiencing unexpected results using wiringPi's wiringPiI2CWriteReg16() function, and I'm not sure if it's due to incorrect usage, or something else.