On 23/01/18 09:15, Gordon Henderson wrote:
> In article , RobH  
wrote:
>> On 22/01/18 16:23, Andy Burns wrote:
>>> Dave Liquorice wrote:
>>>
>>>> gpio is a utilty supplied by WiringPi which I'm fairly sure isn't
>>>> included in the Raspbian distribution.
>>>
>>> I have a fresh Pi3 with raspian (not lite) installed via latest NOOBS,
>>> and wiringPi is included.
>>
>> How do I find out if it is installed or not, and if not, should I
>> install it.
>
> Open a terminal and type:
>
>    gpio -v
>
> It ought to read 2.44 (or greater) if wiringPi is installed. If it's not
> installed, then:
>
>    sudo apt-get install wiringpi
>
> will get it for you. (Assuming Raspbian or a Raspbian derived system)
>
> The command:
>
>    gpio readall
>
> will always give you a handy print out of the GPIO connector with the
> 3 different pin numbering schemes. wiringPi by default uses it's own
> numbering scheme, but with the -g flag to the gpio program it uses
> the native gpio pin numbers and with the -1 flag it uses the physical
> pin numbers (On the original Pi the connector was marked P1, hence the -1
flag)
>
> Pin numbering can be confusing, see this:
>
>    https://projects.drogon.net/wiringpi-pin-numbering/
>
> The best pin out site is the Pimoroni one at
>
>    https://pinout.xyz/
>
> A very simple way to get/test a pin with an LED is 'blink', see here:
>
>    https://projects.drogon.net/raspberry-pi/gpio-examples/blink/
>
> I would strongly suggest that newbies do not jump into code, nor that
> they try to use the sysfs interface either when starting out - it's just
> too much to do, learn and get wrong - this one command is all you need:
>
>    gpio -g blink 17
>
> to test an LED on BCM_GPIO pin 17, wiringPi pin 0, physical pin 11.
>
> Gordon
> (wiringPi author)
>

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.

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