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Can someone clear this GPIO thing?


Sp0T
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Hello Everyone,

 

I would like to play with my A20 board a bit and would like to use the GPIOs. I checked the forum but it's still not clear what to do and how. Can someone explain to me how to get for example pin 16 on the board?

 

This is the fex:

Spoiler

[gpio_para]
gpio_used = 1
gpio_num = 88
gpio_pin_1 = port:PB20<1><default><default><default>
gpio_pin_2 = port:PB21<1><default><default><default>
gpio_pin_3 = port:PB20<1><default><default><default>
gpio_pin_4 = port:PI03<1><default><default><default>
gpio_pin_5 = port:PB22<1><default><default><default>
gpio_pin_6 = port:PB23<1><default><default><default>
gpio_pin_7 = port:PI14<1><default><default><default>
gpio_pin_8 = port:PI10<1><default><default><default>
gpio_pin_9 = port:PI13<1><default><default><default>
gpio_pin_10 = port:PI12<1><default><default><default>
gpio_pin_11 = port:PI11<1><default><default><default>
gpio_pin_12 = port:PH05<1><default><default><default>
gpio_pin_13 = port:PH03<1><default><default><default>
gpio_pin_14 = port:PH00<1><default><default><default>
gpio_pin_15 = port:PH01<1><default><default><default>
gpio_pin_16 = port:PH01<1><default><default><default>
gpio_pin_17 = port:PI19<1><default><default><default>
gpio_pin_18 = port:PH02<1><default><default><default>
gpio_pin_19 = port:PH02<1><default><default><default>
gpio_pin_20 = port:PI20<1><default><default><default>
gpio_pin_21 = port:PI21<1><default><default><default>
gpio_pin_22 = port:PI17<1><default><default><default>
gpio_pin_23 = port:PH20<1><default><default><default>
gpio_pin_24 = port:PH21<1><default><default><default>
gpio_pin_25 = port:PI16<1><default><default><default>
gpio_pin_26 = port:PI16<1><default><default><default>
gpio_pin_27 = port:PI18<1><default><default><default>
gpio_pin_28 = port:PH05<1><default><default><default>
gpio_pin_29 = port:PI21<1><default><default><default>
gpio_pin_30 = port:PH03<1><default><default><default>
gpio_pin_31 = port:PI20<1><default><default><default>
gpio_pin_32 = port:PH17<1><default><default><default>
gpio_pin_33 = port:PB19<1><default><default><default>
gpio_pin_34 = port:PB18<1><default><default><default>
gpio_pin_35 = port:PH19<1><default><default><default>
gpio_pin_36 = port:PE00<1><default><default><default>
gpio_pin_37 = port:PH16<1><default><default><default>
gpio_pin_38 = port:PE01<1><default><default><default>
gpio_pin_39 = port:PH14<1><default><default><default>
gpio_pin_40 = port:PE03<1><default><default><default>
gpio_pin_41 = port:PE02<1><default><default><default>
gpio_pin_42 = port:PH18<1><default><default><default>
gpio_pin_43 = port:PH11<1><default><default><default>
gpio_pin_44 = port:PE04<1><default><default><default>
gpio_pin_45 = port:PE05<1><default><default><default>
gpio_pin_46 = port:PE06<1><default><default><default>
gpio_pin_47 = port:PE07<1><default><default><default>
gpio_pin_48 = port:PE08<1><default><default><default>
gpio_pin_49 = port:PE09<1><default><default><default>
gpio_pin_50 = port:PE10<1><default><default><default>
gpio_pin_51 = port:PE11<1><default><default><default>
gpio_pin_52 = port:PH13<1><default><default><default>
gpio_pin_53 = port:PI01<1><default><default><default>
gpio_pin_54 = port:PI00<1><default><default><default>
gpio_pin_55 = port:PH07<1><default><default><default>
gpio_pin_56 = port:PH08<1><default><default><default>
gpio_pin_57 = port:PB02<1><default><default><default>
gpio_pin_58 = port:PH09<1><default><default><default>
gpio_pin_59 = port:PD25<1><default><default><default>
gpio_pin_60 = port:PD27<1><default><default><default>
gpio_pin_61 = port:PD26<1><default><default><default>
gpio_pin_62 = port:PH06<1><default><default><default>
gpio_pin_63 = port:PD24<1><default><default><default>
gpio_pin_64 = port:PD23<1><default><default><default>
gpio_pin_65 = port:PD22<1><default><default><default>
gpio_pin_66 = port:PD21<1><default><default><default>
gpio_pin_67 = port:PD20<1><default><default><default>
gpio_pin_68 = port:PD19<1><default><default><default>
gpio_pin_69 = port:PD18<1><default><default><default>
gpio_pin_70 = port:PD17<1><default><default><default>
gpio_pin_71 = port:PD16<1><default><default><default>
gpio_pin_72 = port:PH12<1><default><default><default>
gpio_pin_73 = port:PD00<1><default><default><default>
gpio_pin_74 = port:PD01<1><default><default><default>
gpio_pin_75 = port:PD02<1><default><default><default>
gpio_pin_76 = port:PD03<1><default><default><default>
gpio_pin_77 = port:PD04<1><default><default><default>
gpio_pin_78 = port:PD05<1><default><default><default>
gpio_pin_79 = port:PD06<1><default><default><default>
gpio_pin_80 = port:PD07<1><default><default><default>
gpio_pin_81 = port:PD08<1><default><default><default>
gpio_pin_82 = port:PD09<1><default><default><default>
gpio_pin_83 = port:PD10<1><default><default><default>
gpio_pin_84 = port:PD11<1><default><default><default>
gpio_pin_85 = port:PD12<1><default><default><default>
gpio_pin_86 = port:PD13<1><default><default><default>
gpio_pin_87 = port:PD14<1><default><default><default>
gpio_pin_88 = port:PD15<1><default><default><default>

 

 

Thanks,

Sty

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Some future more information, my board is an Orange PI mini A20.

 

I tried to use the formla by xunxi :

(position of letter in alphabet - 1) * 32 + pin number

 

But all the numbers are over 88 and i'm not able to export them at all.

 

I try to calculate out 

gpio_pin_16 = port:PH01 but i don't really know it this port 1 or port 16 or none of them. 

it was (8 - 1) * 32 + 1 which is 225 but there are no 225 the max is 88

 

If anyone can help i would thanks that.

 

Regards,

Spot

 

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Hello,

 

From the script.bin file(linked in the first post)

 

[gpio_para]
gpio_used = 1
gpio_num = 88

 

Yes, i tried and i got error because there are only 88 ports declared into the script.bin file.

 

Regards,

Sp0T

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I'm not using Legacy, but always Mainline, so my previous post was wrong.

 

Zador was right, Legacy image still using the old numbering scheme.

 

So the commands would be more likely be for PH1 :

echo 16 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio16_ph1/direction
echo 1 > /sys/class/gpio/gpio16_ph1/value

 

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This one worked:

 

echo 16 > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio16/direction
echo 1 > /sys/class/gpio/gpio16/value

 

But i still don't know which physical port is this?

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