ANT Forum

Hi,
we want to build a HRM Sensor with a Microchip PIC.
The PIC is a SPI Slave to the nRF24 AP2.
1. Which commands are necessary to establish a radio connection?
We see a lot of commands in the manual, but which is the minimum?

2. What ANT+ Pages are mandatory??

Thanks for your help:)      

Hello,

In response to your first question, I have posted a couple of links to the ANT General Questions forum on how to get started with ANT development in embedded systems, and how to get started with development of ANT + Enabled Applications:
http://www.thisisant.com/component/option,com_fireboard/Itemid,146/func,view/catid,25/id,1391/
http://www.thisisant.com/component/option,com_fireboard/Itemid,146/func,view/catid,25/id,1169/

You will also want to read the ANT Message Protocol and Usage document, available in the Developer's Zone:

http://www.thisisant.com/pages/developer-zone/ant-protocol-and-usage

And the HRM device profile available in the ANT+ Adopter Zone:

http://www.thisisant.com/pages/ant/ant-device-profiles

The mandatory pages for the HRM are pages 2 and 3 and either one or both of 0 and 4.

Hope this helps!      

Thanks, for the help.
We have a garmin HR belt. With the display simulator we
see the device and the value but since now we could not
establish a connection with ANTware II.
We set for display slave, rf channel 57, id=0.
Maybe you have more information      

did you set the network key to ANT+?      

Yes we did.
After powerup we receive a startup message ID 0x6F
Then we set as described in your doc profile_HRM the
messages
ANT_SetNetworkKey(ucNetNum, aucNetKey);

ANT_AssignChannel(ucChanNum, ucChanType, ucNetNum);

ANT_SetChannelId(ucChanNum, usDeviceNum, ucDeviceType, ucTransType);

ANT_SetChannelPeriod(ucChanNum, usMessagePeriod);

ANT_SetChannelRFFreq(ucChanNum, ucRF);

ANT_OpenChannel(ucChanNum);

How does the ack message look like and what is the maximum
and typical response time?
Thanks      

Meanwhile I found the ACK message,
but I still don't know the typical response time for
the ack meassage?

Are the commands above enough to work for a typical
HRM communication?

Thanks      

HRM does not use the ack message type. Please read the HR device profile and ANT Message Protocol and Usage documents:

http://www.thisisant.com/pages/ant/ant-device-profiles

http://www.thisisant.com/pages/developer-zone/ant-protocol-and-usage


Also refer to the ANT+ simulator tool source code.

http://www.thisisant.com/pages/ant/ant-simulator-tools      

thanks again.
A hardware resetline should be enough for the AP2 chip without
snych sequence on the byte sinchronous interface.
I couldn't find any detailed timing diagram for this situation?
I just have found the synch on byte synchronous app.

Does the AP2 chip also send the startup message after powerup and
resetpin??      

Please refer to the Interfacing with ANT General Purpose Chipsets and Modules document at the below link:

http://www.thisisant.com/pages/developer-zone/ant-protocol-and-usage

For general ANT questions please post on the "ANT General Questions" forum.