# Holding the logic 'high' state for a certain time **URL:** \ **Category:** Open AT\ **Created:** [September 25, 2009, 4:30am UTC](https://forum.sierrawireless.com/t/holding-the-logic-high-state-for-a-certain-time/3667 "2009-09-25T04:30:49Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Shafeer](https://avatars.discourse-cdn.com/v4/letter/s/e36b37/32.png) [@Shafeer](https://forum.sierrawireless.com/u/Shafeer)\ **Post date:** [September 25, 2009, 4:30am UTC](https://forum.sierrawireless.com/t/holding-the-logic-high-state-for-a-certain-time/3667/1 "2009-09-25T04:30:49Z")
I have a fastrack supreme 10 modem, using adl is it possible to instruct the GPIO to hold a ‘high’ state(high bit) for a amount of time(eg. 5mins) Thanks Shafeer ---
**Author:** ![davidc](https://avatars.discourse-cdn.com/v4/letter/d/a183cd/32.png) [@davidc](https://forum.sierrawireless.com/u/davidc)\ **Post date:** [September 25, 2009, 5:24am UTC](https://forum.sierrawireless.com/t/holding-the-logic-high-state-for-a-certain-time/3667/2 "2009-09-25T05:24:45Z")
Hiya, Are you writing your own application, or relying on the internal AT commands? If you are writing your own application, you can use a timer or calendar alarm event to generate pretty much any time you want. If you’re relying on the internal AT commands, I don’t think that there’s anything there…so you might (probably) have to write a simple application to do this. Have a look at : adl\_tmrXXXX() functions, adl\_rtcXXXX() functions, adl\_gpioXXXX() fucntions and the AT+CALA command. This should give you a good starting point… ciao, Dave ---
**Author:** ![Shafeer](https://avatars.discourse-cdn.com/v4/letter/s/e36b37/32.png) [@Shafeer](https://forum.sierrawireless.com/u/Shafeer)\ **Post date:** [September 25, 2009, 6:43am UTC](https://forum.sierrawireless.com/t/holding-the-logic-high-state-for-a-certain-time/3667/3 "2009-09-25T06:43:28Z")
Thanks for your reply I will be using adl\_tmrsubscribe, but i want to know if adl\_tmrsubscribe has maximum time? in other words,using this hello world code as a reference ```auto void adl_main ( adl_InitType_e InitType ) { TRACE (( 1, "Embedded : Appli Init" )); /* Set 1s cyclic timer */ adl_tmrSubscribe ( TRUE, 10, ADL_TMR_TYPE_100MS, HelloWorld_TimerHandler ); } ``` can i modify it to wait for around 20 mins? In this way… ```auto /* Set 20mins(1200s) cyclic timer */ adl_tmrSubscribe ( TRUE, 12000, ADL_TMR_TYPE_100MS, HelloWorld_TimerHandler ); ``` ---
**Author:** ![davidc](https://avatars.discourse-cdn.com/v4/letter/d/a183cd/32.png) [@davidc](https://forum.sierrawireless.com/u/davidc)\ **Post date:** [September 25, 2009, 6:59am UTC](https://forum.sierrawireless.com/t/holding-the-logic-high-state-for-a-certain-time/3667/4 "2009-09-25T06:59:42Z")
Hiya, > [@Shafeer](#): > > I will be using adl\_tmrsubscribe, but i want to know if adl\_tmrsubscribe has maximum time? Sure does. Look in the ADL guide for the value of ADL\_TMR\_100MS\_MAX\_VALUE (Section 3.4.3.1 in the ADL R7.4 version). According to the guide, the max period for the timer is around 7 days. For long duration events, you might be better to read the real-time clock (using adl\_rtcXXX()), and subscribe to the +CALA unsolicited event, and then set an alarm sometime in the future using a call to AT+CALA. It’s a bit messy (some ADL calls, some AT commands) though. ciao, Dave ---
**Author:** ![Madouc](https://avatars.discourse-cdn.com/v4/letter/m/b782af/32.png) [@Madouc](https://forum.sierrawireless.com/u/Madouc)\ **Post date:** [September 25, 2009, 7:00am UTC](https://forum.sierrawireless.com/t/holding-the-logic-high-state-for-a-certain-time/3667/5 "2009-09-25T07:00:21Z")
> [@Shafeer](#): > > Thanks for your reply > I will be using adl\_tmrsubscribe, but i want to know if adl\_tmrsubscribe has maximum time? > > in other words,using this hello world code as a reference > > ```auto > void adl_main ( adl_InitType_e InitType ) > { > TRACE (( 1, "Embedded : Appli Init" )); > /* Set 1s cyclic timer */ > adl_tmrSubscribe ( TRUE, 10, ADL_TMR_TYPE_100MS, HelloWorld_TimerHandler ); > } > ``` > > can i modify it to wait for around 20 mins? > In this way… > > ```auto > /* Set 20mins(1200s) cyclic timer */ > adl_tmrSubscribe ( TRUE, 12000, ADL_TMR_TYPE_100MS, HelloWorld_TimerHandler ); > ``` if you would look at the documentation you will find that: > [@ADL user guide](#): > > 3.4.3.1 ADL\_TMR\_100MS\_MAX\_VALUE > ADL\_TMR \_100MS\_MAX\_VALUE defines the maximal value that can be set for a timer with a > granularity of 100 ms. Refer to the TimerValue parameter in adl\_tmrSubscribe > function (see section 3.4.7) and adl\_tmrSubscribeExt function ( see section 3.4.8 ). The > maximal period of the timer is about 7 days. > • Code > #define ADL\_TMR\_100MS\_MAX\_VALUE 0x5E9000 > • Description > ADL\_TMR\_100MS\_MAX\_VALUE : Max value for 100ms-timer ---
**Author:** ![Shafeer](https://avatars.discourse-cdn.com/v4/letter/s/e36b37/32.png) [@Shafeer](https://forum.sierrawireless.com/u/Shafeer)\ **Post date:** [September 25, 2009, 9:14am UTC](https://forum.sierrawireless.com/t/holding-the-logic-high-state-for-a-certain-time/3667/6 "2009-09-25T09:14:27Z")
great thanks for prompt replies i wont be needing 7 days long timer…max a few hours only just another thing, my (one-shot timer)timer is gonna activate everytime a sms is recieved According to the user guide: ```auto adl_tmr_t *tt void Timer_Handler(u8 Id, void * Context) { adl_atsendResponse... //Timer is not unsubscribed since it expires "naturally" } bool SMS_AUTO_Handler(ascii *SmsTel, ascii *SmsTimeOrLength, ascii *SmsText) { tt = adl_tmrSubscribe ( FALSE, 12000, ADL_TMR_TYPE_100MS, Timer_Handler); } ``` Since the one shot timer is not unsubscribed, whenever a new message is recieved, will it overwrite the old subscription? ---
**Author:** ![awneil](https://avatars.discourse-cdn.com/v4/letter/a/49beb7/32.png) [@awneil](https://forum.sierrawireless.com/u/awneil)\ **Post date:** [September 25, 2009, 10:04am UTC](https://forum.sierrawireless.com/t/holding-the-logic-high-state-for-a-certain-time/3667/7 "2009-09-25T10:04:45Z")
> [@ADL User Guide](#): > > Note: > Once a “one shot” (non cyclic) timer has expired and the handler is called, there is no need to unsubscribe from the Timer service: such a timer is automatically unsubscribed once elapsed.