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22 November 2014 02:37 AM

MaximumTrainer Sr. Member

Total Posts: 123

Joined 2013-10-07

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Hi guys,

Currently trying to implement battery status warning for all sensors (HR, CAD, SPD, PWR)
-For power, it's good with the new page that handles this well (GLOBAL_PAGE_82)

-For Heart Rate, I used the max time of battery life as the battery warning threshold

if (stPage1Data.ulOperatingTime > 33554432 && !alreadyShownBatteryWarning) {
                qDebug() << "Emit signal batterylow";
                emit batteryLow(tr("Heart Rate"), 1);
                alreadyShownBatteryWarning = true;
            } 

-For Cadence and Speed however, in the documentation it mentions a page "Data Page 4 – Battery Status" that is supposed to handle that. I checked the "antplus_bike_speed_and_cadence_v1.3.0" source code and it doesn't seem the code there handle theses messages. Would be nice to update it if you guys have the code to save some time decoding theses messages.

Thanks a lot!
Max

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25 November 2014 11:54 AM #1

usamak Sr. Member

Total Posts: 156

Joined 2013-01-07

PM

Hi,

We don't have plans to update the reference designs in the near future.

The HandleDataMessages() method provides examples on decoding data pages 1 - 3. Using the data page definition from the device profile, it should be simple to create a data structure with the fields you require, and use the data page format to decode the received message.

25 November 2014 12:40 PM #2

MaximumTrainer Sr. Member

Total Posts: 123

Joined 2013-10-07

PM

Hi thanks for your reply.

To be honest, I think it's the C style programming that is giving me problem (not used to UCHAR and bit shifting..)

Here is the code I started :

case BSC_PAGE_3:
        {
            stPage3Data.ucHwVersion   = (ULONG)stMessage.aucData[ucDataOffset+1];
            stPage3Data.ucSwVersion   = (ULONG)stMessage.aucData[ucDataOffset+2];
            stPage3Data.ucModelNumber = (ULONG)stMessage.aucData[ucDataOffset+3];
            break;
        } 
        case BSC_PAGE_4:  //Battery Status
        {
            ULONG ucBatteryStatus;
            
            ucBatteryStatus   = (ULONG)stMessage.aucData[ucDataOffset+2];
            
            //battery status is bit 4-6 of ucBatteryStatus
            //The coarse battery voltage can be found easily by using the bit mask of 0x0F on byte 7 as it requires no bit shifting.
//TODO
            
            if (ucBatteryStatus == 4) {
                qDebug() << "Battery status low!";
            }
            else if (ucBatteryStatus == 5) {
                qDebug() << "Battery status critical!";
            }
            break;
        } 

I will try some trial and error until I get it I guess, thanks!

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