I have got Arduino MEGA 2560. What I would like to do is to send a signal to Arduino via serial port to light specified LED up. However, I cannot find any documentation about this. What steps should I follow?
I think first, I need to compile the driver of Arduino and add it to Linux kernel. Second, I have to find some header files to use them in module. Then, I have to find functions to start serial communication and to light LEDs up. However, these are just my thoughts.
Any advice will be appreciated.
The arduino-mega (the one with ATmega2560) documentation is here:
https://www.arduino.cc/en/Main/ArduinoBoardMega2560#documentation
The serial communication via UART:
https://www.arduino.cc/en/Reference/SoftwareSerial
Since there are other ways for serial communication with the ATmega please read the documentation [above] and compare that to your exercise sheet.
I think such a kernel module is already available - and used by the arduino-ide.
Related
I have a question linked to Linux and serial port.
I want to be able to receive and send messages to a dedicated serial port and to redirect it to another port (/dev/tty).
For the first part, I’m able to dialog with my hardware equipment without any problem, but I’m just wondering if it’s possible to intercept and redirect message coming from a serial port #1 to another port #2.
To give more context, I had used a GPS Antenna and NTP open source software for years.
Since 2018, the new GPS antenna protocol has modified the order of bytes in the message used by NTP to steer and now it’s not working anymore.
So my idea is to put a simple C program (middleware) which fixes this byte ordering; but I’m wondering if I have to build a kernel-specific module or if it can be done in another way. The NTP software uses the symbolic link to dialog.
Thanks for your help.
You can probably use a simple redirect, look here:
Pipe One Serial Port to Another in Linux
If the ports are in different rates you can use stty or perhaps screen to adjust: https://unix.stackexchange.com/a/117064
If you need it to be in c program to manipulate it you can use the following: https://stackoverflow.com/a/6947758/8901188
Using c it will need to run in an infinite loop so it can constantly read, manipulate and write the data.
I am taking Arduino Prototype code used for a DS3231 RTC and taking it to an embedded platform that does not directly support Arduino code (right now that is the Atmel Xplained Mini). Is there a way for me to create an equivalent program without writing an entire I2C protocol and the entire data communication from scratch? There must be an overlapping library/header/code block that I can adapt to my purpose.
As an example I am looking to make the code here work on the Atmel Xplained Board. The code should be pretty simple, what I need is for the DS3231 to tell the MCU the time when it asks for it. I can do the manipulation of the date/time myself, it is getting that information on a non-Arduino platform that is the road block for me.
Arduino has an existing wiring library that facilitates I2C communication, most professional development frameworks aren't quite so simple but are also more full-featured. I'm assuming you are using Atmel Studio, you'll want to look at the TWI (two-wire interface) documentation for doing I2C communication.
AVR315: Using the TWI Module as I2C Master
You can copy TWI_Master.c and TWI_Master.h to your project and use these for I2C communication. That is what I've typically done in the past.
The demo code that goes with this app note can be found here, main.c has an example of the usage of this I2C driver:
AVR315 Demo Code
I wish to read the EUI64 address from an AT24MAC602 memory chip interfaced to an Atmega128rfa1 MCU over the Two wire interface. I tried to modify the I2C master drivers which are available for other platforms to suit my need. However, I wasn't able to carry out these modifications successfully as the program stopped responding as soon as the slave address was written to the twi bus with Write flag set. I failed to uncover the underlying reasons for the same.
As Contiki OS is quite popular, i thought someone might have already come up with contiki specific libraries for reading writing over TWI interface for Atmega128rfa1 MCU. If so, please provide pointers to the twi drivers or documentation for the same, or suggest factors that should be considered for developing such drivers. Thank you.
If you don't have any luck finding/creating a driver for the TWI peripheral, you might consider emulating it by configuring the SDA/SCL pins as general I/O and then implementing the TWI protocol yourself. If you're just doing a one-time read of a chip ID then speed probably isn't a big concern, so this could work if you get desperate. Google should throw up a few examples of emulated TWI.
I am trying to send data from a Kamstrup Multical 601 to an Arduino Uno using the M-bus protocol.
I am considering trying to use the libmbus c libraries to do this. However, I do not have a lot of experience in c programming so was wondering if:
you think this is a realistic/achievable approach?
anyone could suggest an alternative/easier approach?
The main chip on the Arduino Uno is the Atmel Atmega382P-PU.
After getting the data to the Arduino I aim to perform some calculations and send data to an LCD (this I think I can do).
On the Arduino Website there is a short how-to about the use of external C-Libraries with Arduino.
Note that you cannot simply connect M-Bus with a RS-232 interface. There is a so called "level-shifter" device necessary inbetween to do the "electrical transition". See the EN 13757-2 standard doucment for what this device is exactly doing with the signal. Without such a device you won't get any word out of your M-Bus device.
The library you link to appears to be for Linux. The Arduino, of course, doesn't run Linux so a library won't compile for it directly.
You should probably try implementing the library yourself, but using the Arduino's standard libraries to access ports and so on.
Does anyone ever develop some application to control the spi device on OMAP3? I can load the spi driver "mcspi", but I don't know how to use it.
As of at least PSP 3.00.00.04, the mcspi driver is integrated with the Linux spi stack.
Turn on
CONFIG_SPI and CONFIG_SPI_OMAP24XX
in your kernel.
Here's how to use spi devices, in general.
There is also the spidev driver, which presents a char device to userspace, but it's experimental.
Ok So first I need to apologize for my previous shoot from the hip answer.
I too have now started looking into trying to get the McSPI's working and it has been some what painful. TI does not have lot of documentation, and I still haven;t been successful in getting any of the McSPI's to actually work, yet. But I thought I would post a link to the beagle board google discussion on the subject, as it appears they have been successful at getting at least McSPI3 working on the OMAP3530.
http://groups.google.com/group/beagleboard/browse_thread/thread/15d9488c1ec314ef/5ca06c67ff438106?q=mcspi3#5ca06c67ff438106