On 23/01/18 15:30, Dennis Lee Bieber wrote:
> On Tue, 23 Jan 2018 10:10:14 +0000, RobH  declaimed the
> following:
>
>> Thanks for the information about wiringPi, and yes it is already
>> installed on my Pi3. Interestingly when I do a gpio readall, it shows that:
>>
>> BCM 17
>> wPi 0
>> Name GPIO. 0
>> Mode OUT.
>> Physical 11
>>
>> All the other pins are shown as Mode IN.
>
>  Which implies that something executed a mode OUT setting...
>
>  But what does any of:
>
> gpio -g read 17
> gpio read 0
> gpio -1 read 11
>
> produce. Readall appears to merely report the direction, the chip pin, the
> header pin, and the WiringPI number&name. Unless the pin, in OUT mode,
> comes back as high (1) internally the physical pin will measure near GND
> level. If it does read back as high, and the physical pin is still near
> GND, you may have a bad chip -- in that the pin driver is not providing a
> signal... Double check by setting mode IN, jumpering pin first to ground
> and reading it (should be low/0), then jumper to 3.3V [DO NOT TOUCH 5V with
> the jumper] and again reading (should be high/1).
>
>  If I had physical access, I'd probably do a verification run by writing
> 0, measuring all pins relative to ground, then writing 1 and measuring all
> pins again -- looking for any pin that changed value. If a pin changes
> value -- stay on that pin with the meter and alternately command the system
> to 0 and 1 to see if the value follows the commanded writes.
>

All of the above commands return 0

I set the direction to IN then did gpio readall which shows the gpio17
pin as IN and 0 voltage.

Then I connected the positive jumper wire to the 3.3 volt pin, and then
measured th voltage across the positive and ground wires, which was 3.28
Volts.

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