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Can this board be used with java?

Former Member — Tue, 05 Aug 2014 17:35:43 GMT

Hi,

I am currently trying to write a little program in java which would display information from the sensors on the board, but I am struggling with how i would do this in java compared to the python scripts provided which use the sensor.so file to communicate with the board.

Many thanks

RE: Can this board be used with java?

Former Member — Tue, 22 Mar 2016 13:32:43 GMT

The difference between a language like java (or c#) and a lower level language like c or c++ is the fact that they have a virtual machine. This has many advantages, like making the application platform-independent. But it also means that each platform has to have the vm for it.Now, microcontrollers are not uniform and vary in power, memory, and many other features. So adopting the JVM (java's virtual machine) for them is not easy even when possible. Most of the time its just impossible - most of the uc have very low memory capacity (part of what makes them cheap) - this would make fitting any general-purpose JVM there impossible, not to mention also with the application code.I am aware of some partial-implementations of java for microcontrollers. For example "java-based" sim cards (which have a very small controller inside) are there, but they have a very limited version of java.

The memory usage shown is virtual memory used, not real memory... JVM just allocates a bunch when it starts.

RE: Can this board be used with java?

Former Member — Mon, 07 Sep 2015 12:51:40 GMT

Hi, i'm sorry to bother you after a year, but did you figure out how to use the MEMS Sensor Evaluation board in java?

Would be great if you could share some knowledge

RE: Can this board be used with java?

Former Member — Thu, 03 Sep 2015 20:44:21 GMT

Probably figured it out by now, but for anyone else that stumbles on the same question I suggest taking a look at Using Eclipse to Write HelloWorld in Java for the Overo - Gumstix User Wiki

Project Demo MED-SPO2 - AN4327 Freescale

Former Member — Fri, 08 May 2015 04:07:31 GMT

Hello everyone. I have just bought MED-SPO2 kit with TWR-K53N512 TOWER SYSTEM. But I can't find the project and GUI in AN4327 document.

Can you send it to me? I need it.

Thank you very much.!

Reverse-engineered sensor.so with source

Former Member — Sat, 13 Sep 2014 07:30:13 GMT

I have reverse engineered the sensor.so so that it can be compiled for V1.0 (and V2.0) Raspberry Pi Boards.

The source is available here: https://github.com/larsch/rpi-mems-sensor

I found that sensor.so is based on the bcm2835 library (bcm2835: C library for Broadcom BCM 2835 as used in Raspberry Pi), and is actually in full GPL violation. The sensor-specific function are quite simple though and mostly consist of the register numbers and bus addresses needed to talk to the chip. This could be implemented from scratch using the datasheet. The chips don't really require a "driver" when done this way, as the program basically talks on the I2C bus directly via the bcm2835 library.

I've kept it so that everything works the same as the original sensor.so and it is fully compatible with the original Python Scripts (get them from http://git.oschina.net/embest/rpi_sensor_board.git). It is working perfectly on my V1.0 board with all three sensors here, but note that the bcm2835 library needs to be compiled specifically for the V1.0 board.

RE: Reverse-engineered sensor.so with source

cyph3rpunk — Tue, 05 May 2015 16:31:26 GMT

Does anyone have an idea how to get the scripts working with Raspberry Pi 2? Even though the BCM2835 library should work with the Pi2 the resulting sensor.so makes the scripts hang - just like the included one :/

Wieso funktioniert der Quicklink für die Datei sensorboard/sensor_board_1128.zip nicht?

Former Member — Sat, 13 Sep 2014 19:11:28 GMT

Why doesn't work the Quicklink for downloading the sensorboard/sensor_board_1128.zip file?