Low power mode management by the STM8TL5x STMTouch Library

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Doc ID 018847 Rev 3

step is almost identical to the previous example in Section 7.2.1: Low power management

with all acquisition banks.

Entry into Proximity detection mode is conditioned by the value of the “proxy_mode” variable

which is managed in a user function. This mode is exited by checking the state of the

POWER touchkey.

The response time depends on the scanning frequency but, also on the debounce value

which is defined by the CounterDebProx parameter in the touchkey TSL_TouchKeyParam_T

structure. If needed, this variable can be modified by the user application when entering

Proximity detection mode and it can be restored when exiting it (this variable is not modified

in the example given below).

Code example 2

// Executive low power loop, runs continually till POWER key detects a proximity

AWU_Init(AWU_Timebase_512ms);

ECS_last_tick = 40;

while (proxy_mode)

{

TSL_user_Action_LowPower();

if (MyTKeys[POWER].p_Data->StateId == TSL_STATEID_DEB_PROX)

{

AWU_Init(AWU_Timebase_16ms); //reduce the period between acquisition in order

to have a faster response time.

}

else

{

if (TEST_PROX(POWER))

{

proxy_mode = FALSE;

POWER_LED = 1;

LED_ManageLighting();

}

else

{

AWU_Init(AWU_Timebase_512ms);

}

}

disablePXS();

// Prepare AWU