PaulS, SurferTim,

perhaps it will work without persistant connections. The protocol definition doesn't specifiy something like that, right. But it also says:

The server MUST differentiate all client sessions internally

The big question is: How does the SRCP client software interprets this (like RocRail, Android SRCP client, ...). Perhaps I will try it with non-persistant connections and see what happens. If it will not work I have to think about it again (perhaps using a Raspberry with multithreaded server and connect the Arduino to the Rapsi with I2C).

The project can be found at https://sourceforge.net/projects/maerklino/. The current state is: The first version of Jan Weller is working (see http://forum.rocrail.net/viewtopic.php?t=4583 but not very comfortable. I have done some changes but hadn't test them until now. Hopefully I can do this on weekend.

Thanks, Holger

 

PaulS,

thanks for the fast answer!

I have a sketch for driving Maerklin-Motorola-II model locomotives. Now I want to add support for SRCP (http://srcpd.sourceforge.net/srcp/srcp-084.pdf), so I can create a SRCP central station. For this I have to allow 1+n clients. Clients can be programs or other Arduinos which can talk SRCP. SRCP is TCP based...

Regards, Holger

Hi all,

is it possible to write a server sketch where I can accept more than one connection via TCP? I have only found many (working) example for just one connection...

Thanks, Holger

Just not tested, but if you check out the code of the Arduino MIDI library from the link mymaestro posted, I think there is already a Multi-MIDI(Serial) class in this library (also it seems there is a software MIDI implemented). If I have more time I will try this.

Regards, Holger

Ahhh, great! This would be a solution on a Mega. I think I have to buy one to test ist.

Thanks, Holger

Hi all,

I hope this will be the right forum for my question:
I want to build a MIDI-Router (3 MIDI-INs / 3 MIDI-OUTs). Perhaps I can use a Mega, but are the serial ports of the Mega buffered?
Is there another solution, perhaps with other Serial-UARTs which have a SPI-Bus (does anyone know which type can handle MIDI)?
Has anyone done such thing already and can give me some hints?

Thanks, Holger

Ok, I understand what my problem was.

Thanks for your help!

Holger

Hi all,

ok, I see, that my Uno is not a memory giant... and my class is not very small. But with MAX_FADE_ELEMENTS set to 10 the storage for one instance should be about 180 Bytes. I tried to use only _one_ instance and the Arduino freezes.

Nick Gammon's hint was the solution (not for everything, but now it works!): The constructor was "too big" - don't ask me why this is a problem. But when rewriting the constructor function to a DMX_RGB.begin() method it works! Also four instances are working! I took a look at http://www.arduino.cc/playground/Code/AvailableMemory and checked my free memory and there were about 300 bytes empty.

If anyone can explain why the constructor was the problem and why I should use a begin()-method for initialization I would be very glad!

Thanks for helping!

Holger
 

Hi all!

thanks for your hints. I wonder that one class instance would need so much memory. I will try your suggestions and write the solution to this thread as soon as possible.

Regards, Holger

Hi all,

I have a strange problem with my selfmade class. I want to use some DMX spots over WiFi, so I created a simple sketch for a client (Arduino+WiFi) and a sketch for a server  (Arduino+Ethernet). For the server I wrote a class called DMX_RGB (see attached). I need to create some instances (globaly)in DMXNet_Server.ino:

Code:

DMX_RGB Bar1("192.168.1.40",4711,10,11,12,9,8);

When I create such an instance, the sketch stops and nothing happens anymore. Also no debug output on the serial monitor...

If I comment out everything which is relating to the instance Bar1 (and of course the code above) the sketch works (also it is not doing what I want :-( )

I think it is a simple, stupid problem - but I cannot find where. Has anyone an idea?

Thanks a lot, Holger

Hi all,

thanks for your responses!

@MarkT: I hoped to find a way to avoid writing the interrupt driven code :-) but it seems that I have to write such library (which will take more time for me than I thaught). My problem is that I have no scope, so I have to do trial & error for the signal generation (that's a problem with all other solutions, too).

@Bill_Kerr: Yes, that's also a possibility to avoid the software signal generation code. But I know that there is a working(!) software implementation based on UARTs (http://srcpd.sourceforge.net/srcpd/index.html). I will keep in mind to change to the hardware signal generation when everything will fail.

@skyjumper: I will use the the Arduino UNO (328P). It seems that someone has made a Port from OpenDCC to the Arduino (http://developer.berlios.de/projects/microsrcp/) which is also based on UART output (like srcpd). But I hope to get arround the tricky timings when using the "right" bit rate to communicate with.

It seems that I have to write my own signal generation code with interrupts or I have to use the hardware encoder from Motorola...

Regards, Holger

Hi skyjumper,

no UART :-)
I need to generate a signal for driving digital modell locomotives (not DCC but Motorola-Märklin). So my other end of the communication is a decoder chip inside the locomotive. I have a rough manual how to generate the frames with a serial line at 19200 bit/s but you have to do some strange timing things to get the right signal. I thaught that it is better to generate the signal without that strange things but for this you "might" have to send the frames with a non-standard bit rate (s. http://modell-zug.com/Support/HowToArticles/DigCtrlSys/DigitalTransmission.htm). I read some documentation where they don't use exactly 4800 bit/s... but I'm not sure.

Regards, Holger

Hi all,

thanks for your answers!
I think I will try to patch NewSoftSerial or use the SPI library. After testing I will post my results here.

Have a nice weekend,

Holger

Hi all,

I am searching for a serial library which can use non-standard bit rates, e.g. 19304 bit/s on a digital port. In fact I just only need to send at this speed with no start and stop bits - just one byte after another. I am not new to programing but new to Arduino and microcontrollers, so I hope someone can give me a hint where I can find such a library or how to set up such functions (I think with timers an interrupts, or?)

Thanks, Holger