# Push Button ( gptio pin 14 ) not permited **URL:** \ **Category:** Uncategorized\ **Created:** [October 21, 2020, 1:30pm UTC](https://mangoh.discourse.group/t/push-button-gptio-pin-14-not-permited/5455 "2020-10-21T13:30:56Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![philippesurbayrole](https://avatars.discourse-cdn.com/v4/letter/p/a9adbd/32.png) [@philippesurbayrole](https://mangoh.discourse.group/u/philippesurbayrole)\ **Post date:** [October 21, 2020, 1:30pm UTC](https://mangoh.discourse.group/t/push-button-gptio-pin-14-not-permited/5455/1 "2020-10-21T13:30:56Z")
I try to find how handle push button to implement some action. After search on legato and mangoh forum, i’ve never found a correct response. So i’ve make some test from [gpioCf3Demo](https://github.com/legatoproject/legato-af/tree/master/apps/sample/gpioCf3Demo). but when i run my application, i’ve this message: ```auto gpioSysfsUtils.c ExportGpio() 151 | Failed to export GPIO 14. Error Operation not permitted ``` I’ve try to read the gpio available on my 7702 with the AT command ```auto at+wiocfg? +WIOCFG: 2,16,0,0,1,0,0 +WIOCFG: 4,3,0,0,1,0,0 +WIOCFG: 6,0,0,0,1,0,0 +WIOCFG: 7,16,0,0,1,0,0 +WIOCFG: 8,16,0,0,1,0,0 +WIOCFG: 13,16,0,0,1,0,0 +WIOCFG: 21,16,0,0,1,0,0 +WIOCFG: 22,16,0,0,1,0,0 +WIOCFG: 23,16,0,0,1,0,0 +WIOCFG: 24,16,0,0,1,0,0 +WIOCFG: 25,16,0,0,1,0,0 +WIOCFG: 28,16,0,0,1,0,0 +WIOCFG: 29,16,0,0,1,0,0 +WIOCFG: 30,16,0,0,1,0,0 +WIOCFG: 31,16,0,0,1,0,0 +WIOCFG: 32,16,0,0,1,0,0 +WIOCFG: 33,16,0,0,1,0,0 +WIOCFG: 35,16,0,0,1,0,0 +WIOCFG: 42,16,0,0,1,0,0 ``` But no gpio 14 (push button) not available ! So, how i can use the push button ? Currently my configuration is: legato 19.11.2 Firmware Version: SWI9X06Y\_02.35.02.00 5208b3 jenkins 2020/06/10 00:30:12 Bootloader Version: SWI9X06Y\_02.35.02.00 5208b3 jenkins 2020/06/10 00:30:12 ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 21, 2020, 2:09pm UTC](https://mangoh.discourse.group/t/push-button-gptio-pin-14-not-permited/5455/2 "2020-10-21T14:09:02Z")
I don’t see there is gpio14 in wp77 product technical specification ---
**Author:** ![philippesurbayrole](https://avatars.discourse-cdn.com/v4/letter/p/a9adbd/32.png) [@philippesurbayrole](https://mangoh.discourse.group/u/philippesurbayrole)\ **Post date:** [October 22, 2020, 10:02am UTC](https://mangoh.discourse.group/t/push-button-gptio-pin-14-not-permited/5455/3 "2020-10-22T10:02:45Z")
But in the mangoh red spécification, the push button is on the gpio 14 ! ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 22, 2020, 10:11am UTC](https://mangoh.discourse.group/t/push-button-gptio-pin-14-not-permited/5455/4 "2020-10-22T10:11:17Z")
it is the io14 of the gpio expander sx1509biultrt!!! ---
**Author:** ![philippesurbayrole](https://avatars.discourse-cdn.com/v4/letter/p/a9adbd/32.png) [@philippesurbayrole](https://mangoh.discourse.group/u/philippesurbayrole)\ **Post date:** [October 22, 2020, 12:15pm UTC](https://mangoh.discourse.group/t/push-button-gptio-pin-14-not-permited/5455/5 "2020-10-22T12:15:51Z")
Great ! But that doesn’t answer my initial question. > [@philippesurbayrole](#): > > So, how i can use the push button ? ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 22, 2020, 12:49pm UTC](https://mangoh.discourse.group/t/push-button-gptio-pin-14-not-permited/5455/6 "2020-10-22T12:49:37Z")
I never used before, but here has an example for reference > [@gpioExpanderService with MangOH Red](https://mangoh.discourse.group/t/gpioexpanderservice-with-mangoh-red/1626): > > Hello, I would like to use the gpioExpanderService with the MangOH RED. In the MangOH.sdef I can see the gpioExpanderService is removed from build with this explanation. Is it possible to use it or not ? Thanks /\* \* There is a conflict between the following software components: \* - sx1509 Linux kernel driver \* - mangOH GPIO expander service \* - gpioexp command line program \* All of these components attempt to control the sx1509 GPIO expander on mangOH Red. The sx1509 \* driver is re… ---
**Author:** ![philippesurbayrole](https://avatars.discourse-cdn.com/v4/letter/p/a9adbd/32.png) [@philippesurbayrole](https://mangoh.discourse.group/u/philippesurbayrole)\ **Post date:** [October 22, 2020, 3:46pm UTC](https://mangoh.discourse.group/t/push-button-gptio-pin-14-not-permited/5455/7 "2020-10-22T15:46:12Z")
Yes, i’ve tested but there is some conflic with the led ! The GPIO of the led give correct response, but but the led does not light up ! ---
**Author:** ![jyijyi](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/jyijyi/32/997_2.png) [@jyijyi](https://mangoh.discourse.group/u/jyijyi)\ **Post date:** [October 23, 2020, 2:23am UTC](https://mangoh.discourse.group/t/push-button-gptio-pin-14-not-permited/5455/8 "2020-10-23T02:23:40Z")
Here I have tried to control the SD\_SEL pin, it is working fine for me on mangoh red board. gpioexp 1 1 enable //To switch SDIO\_SEL to SD CARD: gpioexp 1 9 output normal high \>/dev/null //To switch SDIO\_SEL to IOT0 slot: gpioexp 1 9 output normal low \>/dev/null Also I have tried the following to read the push button value and it works for me: gpioexp 1 14 input value