Re: Get Battery Voltage

[Daniel McCarty]

Ramel Levin wrote:
> 
> This is true for Palm OS 3.x, but for Palm OS 2 getting the percentage is
> not that simple... any ideas?

   This code is from GadgetHack and should work on any version of the OS.
(Pardon the tabs.)

Regards,
Daniel.

#define MaxVoltage   300   // 2 batteries * 150 increments (1.5v)

void GetVoltage(UIntPtr voltage, BytePtr percent) {
        UInt warning;
        DWord romVersion;

        // we have to correctly calculate the current voltage on a PalmPilot,
        // PalmIII, PalmIIIx and PalmV...and in the future, PalmVII.
        FtrGet(sysFtrCreator, sysFtrNumROMVersion, &romVersion);
        if (sysGetROMVerMajor(romVersion) < 3) {
                *voltage = SysBatteryInfoV20(false, /*set*/
                        &warning,
                        NULL, /*criticalThresholdP*/
                        NULL, /*maxTicksP*/
                        NULL, /*kindP*/
                        NULL /*pluggedIn*/);
                // calculate the current percentage using pseudo-floats
                // instead of doubles and their corresponding 3.5k FPL
                *percent = (*voltage - warning) * 100 / (MaxVoltage - warning);
        } else
                *voltage = SysBatteryInfo(false, /*set*/
                        NULL, /*warnThresholdP*/
                        NULL, /*criticalThresholdP*/
                        NULL, /*maxTicksP*/
                        NULL, /*kindP*/
                        NULL, /*pluggedIn*/
                        percent);
}