ANT Forum

I am developing an application with Qt to use an ANT+ usb dongle. I am using the ANT API to access and control the dongle. Until today this has been fine. All of sudden whenever I call "ANT_Init" I get returned a false indicating that something has gone wrong in the initialization. I know that my system recognizes that the dongle is connected and I can still access and control the dongle through AntWareII. In AntWareII I am explicitly releasing the dongle to make sure it is not tied up. I have removed and inserted the dongle several times and I have reset my computer a couple of times - neither of these helped. I also tried initializing using a different channel number (originally I was using 0) but this did not change the behavior. Any insight would be appreciated.      

Are you using a USB1 or USB2?

To be able to connect to USB1, you need to make sure that the DSI* DLLs included in the library package are in the working path of your application.      

alejandra - 09 April 2013 08:49 AM

Are you using a USB1 or USB2?

To be able to connect to USB1, you need to make sure that the DSI* DLLs included in the library package are in the working path of your application.

1. I believe I am using USB2. The computer is relatively new and I do not get the "Your device could perform faster" message when I plug in USB devices. I also checked in the device manager and checked both of my USB hubs and both are listed as operating at high speed which I interpret as using USB2.0.

2. I have not moved the DSI* DLLs. This is issue perplexes me because it started occurring all of a sudden. I made no significant changes to the application. I will try placing the DSI* DLLs in my debug directory to see if that helps.

Thanks.      

alejandra - 09 April 2013 08:49 AM

Are you using a USB1 or USB2?

To be able to connect to USB1, you need to make sure that the DSI* DLLs included in the library package are in the working path of your application.

I deleted my build directory and did a fresh build plus I copied the DSI* DLLs to my build directory (two of them, DSI_CP210xManufacturing_3_1 and DSI_SiUBXp_3_1). The one USB stick that was not working previously appeared to get a little further. The dongle was recognized but after setting the network key (ANT_SetNetworkKey) things seemed to freeze (i.e. the dongle did not start pinging). The other dongle I have continues to work fine.      

You can recognize the type of USB stick by the markings on the plastic. Since the DSI DLLs were needed to connect to it, you most likely have a USB1. Please be aware that USB1 only supports max baud rate of 50000 - make sure you are configuring your code correctly to connect at that baud rate (the demo code has some comments regarding this).      

alejandra - 10 April 2013 10:53 AM

You can recognize the type of USB stick by the markings on the plastic. Since the DSI DLLs were needed to connect to it, you most likely have a USB1. Please be aware that USB1 only supports max baud rate of 50000 - make sure you are configuring your code correctly to connect at that baud rate (the demo code has some comments regarding this).

Okay, I think that worked. I do have a mix of USB1 and USB2 sticks. I tried both on AntWareII and realized that the baud rate was being changed for each type of stick. I could have sworn that I had been using the USB1 stick for a while and that it stopped working all of a sudden. I must have switched sticks and not realized it.

Is there a way to poll the stick to determine what baud rate to use? I assume there must be since AntWareII can detect the rate.

Thanks.      

Corey - 11 April 2013 07:03 AM

Is there a way to poll the stick to determine what baud rate to use? I assume there must be since AntWareII can detect the rate.

Thanks.

I just saw in the Ant DLL the ANT_GetDeviceUSBInfo command but did not see it in the Ant Protocol and Message guide. This seems like it is the function I should use. Is there documentation on this?

Thanks.      

No, it is not possible to poll the USB stick for its Baud Rate.

The automatic detection code in ANTware basically tries to connect at one baud rate, attempts to send a command to ANT to see if serial communication is functional, and if it fails, it tries a different baud rate.      

alejandra - 11 April 2013 08:36 AM

No, it is not possible to poll the USB stick for its Baud Rate.

The automatic detection code in ANTware basically tries to connect at one baud rate, attempts to send a command to ANT to see if serial communication is functional, and if it fails, it tries a different baud rate.

Got it. I will give it a try. Thanks for getting me on the right path.