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01 April 2015 02:31 PM

MaximumTrainer Sr. Member

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Joined 2013-10-07

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Is there really a maximum/recommended max number of channel that can be opened at the same time?

I see the documentation says 8 for USB2 Stick.
But I found that the channel number is a UCHAR so I could possibly open 255 channels on 1 Stick. (seen other software do more than 8 also)
What is the recommended max number before there is too much interference?

Looking to find this because I want multiple rider in my software, and people don't want to buy multiple USB Stick

Thank you!
Max

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02 April 2015 02:21 AM #1

old_man_biking Sr. Member

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Did you TRY to open more than 8 channels?
If I remember right, I got errors when trying to exceed the maximum number of 8 open channels.

Cheers,
OMB

02 April 2015 07:05 AM #2

MaximumTrainer Sr. Member

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Thanks OMB,

You are right I should have tried it, got exited before coding

Will try to find an alternate way to use more than 8 devices on 1 Stick, a friend mentioned more than 1 device on the same channel could be possible?

openChannel(Channel, DeviceType, DeviceNum, RadioFreq, ChannelPeriod, TransType, SearchTimeout); //0
    openChannel(1, DeviceType, DeviceNum, RadioFreq, ChannelPeriod, TransType, SearchTimeout);
    openChannel(2, DeviceType, DeviceNum, RadioFreq, ChannelPeriod, TransType, SearchTimeout);
    openChannel(3, DeviceType, DeviceNum, RadioFreq, ChannelPeriod, TransType, SearchTimeout);
    openChannel(4, DeviceType, DeviceNum, RadioFreq, ChannelPeriod, TransType, SearchTimeout);
    openChannel(5, DeviceType, DeviceNum, RadioFreq, ChannelPeriod, TransType, SearchTimeout);
    openChannel(6, DeviceType, DeviceNum, RadioFreq, ChannelPeriod, TransType, SearchTimeout);
    openChannel(7, DeviceType, DeviceNum, RadioFreq, ChannelPeriod, TransType, SearchTimeout);
    openChannel(8, DeviceType, DeviceNum, RadioFreq, ChannelPeriod, TransType, SearchTimeout); //error trigger here after trying to open more than 8 channel (error AssignChannel) 

Also another small problem, on OSX, using the ANT lib, opening multiple channels one after the other cause problem (unlike Windows).
I had to use this bit of code to wait for last channel to be opened before trying to open a new one..

#ifdef Q_OS_MAC
        //Only need this with ANT_LIB compiled for MacOS, bug channel open too fast, causes crashes
        QTimer timer;
        timer.setSingleShot(true);
        timer.start(5000); // Wait for previous channel to be opened, or 5sec max
        QEventLoop loop;
        QObject::connect(this, SIGNAL(lastChannelOppened()), &loop;, SLOT(quit()) );
        QObject::connect(&timer;, SIGNAL(timeout()), &loop;, SLOT(quit()));
        loop.exec();
#endif 

Again thanks for the great support, <3 ANT

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02 April 2015 11:08 AM #3

MaximumTrainer Sr. Member

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Joined 2013-10-07

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old_man_biking - 02 April 2015 02:21 AM
Did you TRY to open more than 8 channels?
If I remember right, I got errors when trying to exceed the maximum number of 8 open channels.
Cheers,
OMB

Been reading on "Continuous Scanning Mode",
D00000652_ANT_Message_Protocol_and_Usage_Rev_5.1.pdf - p28
Would it be possible to use more than one device on the same channel using this mode?
Is that the recommended way to get more than 8 device? Just looking for a little advice to head in the good direction.. thanks

bStatus = pclMessageObject->SetNetworkKey(USER_NETWORK_NUM, ucNetKey, MESSAGE_TIMEOUT);
bStatus = pclMessageObject->AssignChannel(Channel, 0x00, USER_NETWORK_NUM, MESSAGE_TIMEOUT);  //Bidirectional Slave Channel = 2way
bStatus = pclMessageObject->SetChannelID(Channel, DeviceNum, DeviceType, TransType, MESSAGE_TIMEOUT);
... 

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08 April 2015 08:25 AM #4

old_man_biking Sr. Member

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If I remember right, there are some threads in this forum concerning Continuous Scanning Mode and the Dynastream staff in this forum have recommended CSM for picking up multiple devices.
You could try and search the forum, there should be relevant posts with answers.

Cheers,
OMB

08 April 2015 09:38 AM #5

MaximumTrainer Sr. Member

Total Posts: 123

Joined 2013-10-07

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Oh thanks I wasn't using the good search box, seems like I have a few post to read

Have a great one!
Max

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30 July 2015 05:45 PM #6

MaximumTrainer Sr. Member

Total Posts: 123

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Edit:

Will create a new post for more questions on CSM, thanks

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14 August 2015 10:53 AM #7

Harrison Administrator

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Just for future reference as CSM should work fine for your application, the S210 V5.0 SoftDevice for the nRF51422 now supports up to 15 individual channels, up from 8.

Cheers

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