Hello all,
we are using gpio24 to monitor the status of on/off pin.
At first we set gpio58 to keep the modem always on.
ON/OFF is high:
root@fx30s:~# cat /sys/class/gpio/gpio24/value
0
ON/OFF is Low
root@fx30s:~# cat /sys/class/gpio/gpio24/value
0
What is wrong?
Hi AE_1,
There is an inverter at GPIO24. Note, in Figure 3-4 of the User Manual, there is a bubble at GPIO24, though it’s not obvious. I’ll make a note to update the User Guide.
BR,
Chris
Hello Chris,
let me explain the problem of AE_1 more in detail.
Build up a configuration like in Figure 2-16 (41110030 Rev 4, Page 23).
Try to check the state of the switch by read GPIO24. The problem is,
cat /sys/class/gpio/gpio24/value
returns “0” independent of the state of the switch (opened or closed). Expected is to read a “1” in one case.
Have in mind that the internal pullup is activated.
Regards,
Saleh
Hi Saleh,
thanks for your explanation. That’s exactly what I mean.
cat /sys/class/gpio/gpio24/value returns “0” independent of the state of the switch (opened or closed).
This is for as big problem.
We’ve been able to reproduce the issue and are currently investigating further.
BR,
Chris
Hi cchenry,
when can a solution be expected?
Hi AE_1,
We’re trying to get R17 released, so I can’t promise a solution for this will be included.
BR,
Chris
GPIO24 always 0
4 years later, and this is still a problem? I’m running R15 on FX30.
Like the original post, the following command returns “0” whether or not I connect/disconnect power to PIN3.
cat /sys/class/gpio/gpio24/value
0
My intention was to include Legato code that monitored PIN24, to report “last-gasp” message when power went off. I spent hours writing the code, only to find PIN24 doesn’t actually change.
Cheers and thanks.
I will try that.
I was looking at a page that didn’t show that note.
