CC2540: timeAppHdlCache[timeAppEndHdlIdx] = BUILD_UINT16(p[0], p[1]) - 1;

zhiyi Xiang

Part Number: CC2540

"End handle is one less than handle of characteristic declaration", what this words mean exactly? Can somebody explain MORE detail about it, I'm very confused about this and I such a big fool! Thank you advance.

The code is extracted from BloodPressure provide by Ti, in.../ble/BloodPressure/Source/timeapp_discovery.c

static uint8 TimeAppDiscCurrTime( uint8 state, gattMsgEvent_t *pMsg )
{
...
case DISC_CURR_TIME_CHAR:
...
// If looking for end handle
if ( timeAppEndHdlIdx != 0 )
{
// End handle is one less than handle of characteristic declaration
timeAppHdlCache[timeAppEndHdlIdx] = BUILD_UINT16(p[0], p[1]) - 1;

timeAppEndHdlIdx = 0;
}
...
}

over 8 years ago

0 Fredrik K over 8 years ago

TI__Guru** 106705 points

HI Zhiyi,

In this case some assumptions are made about the characteristic declaration such that we can calculate the end handle simply by subtracting 1 form the declaration.

Cheers,
Fredrik

0 zhiyi Xiang over 8 years ago in reply to Fredrik K

Prodigy 150 points

Thank to Fredrik! from your hint ,I understood at last ,the program told us that the NEXT TURN going into the function ,the declare's handle will be +1, so CURRENT TURN will -1. for short, next turn close the previous trun

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CC2540: timeAppHdlCache[timeAppEndHdlIdx] = BUILD_UINT16(p[0], p[1]) - 1;