Hi,
I Have T2-oLinuXino-LIME-e8Gs16M-IND board. For a backwards compatibility I downloaded a20_Lime_debian_3.4.103_Jessie_2G_eMMC_release_9 image and installed it on emmc.
For a backwards compatibility I need to export gpio pi16 and pi17 but i can't.
This is what I exported:
ls /sys/class/gpio/
export gpio1_pg0 gpio2_pg1 gpio3_pg2 gpio4_pg3 gpio5_pg4
gpio10_pg9 gpio20_ph11 gpio30_ph23 gpio40_pb10 gpio50_pi2 gpio60_pi14
gpio11_pc7 gpio21_ph14 gpio31_ph24 gpio41_pb11 gpio51_pi3 gpio61_pi15
gpio12_pc17 gpio22_ph15 gpio32_ph25 gpio42_pb12 gpio52_pi4 gpio6_pg5
gpio13_pc18 gpio23_ph16 gpio33_ph26 gpio43_pb13 gpio53_pi5 gpio7_pg6
gpio14_pc23 gpio24_ph17 gpio34_ph27 gpio44_pb14 gpio54_pi6 gpio8_pg7
gpio15_pc24 gpio25_ph18 gpio35_pb3 gpio45_pb15 gpio55_pi7 gpio9_pg8
gpio16_ph0 gpio26_ph19 gpio36_pb4 gpio46_pb16 gpio56_pi8 gpiochip1
gpio17_ph2 gpio27_ph20 gpio37_pb5 gpio47_pb17 gpio57_pi9 unexport
gpio18_ph9 gpio28_ph21 gpio38_pb6 gpio48_pi0 gpio58_pi10
gpio19_ph10 gpio29_ph22 gpio39_pb7 gpio49_pi1 gpio59_pi11
If i try to export pi16 and pi17, this is the error:
echo 62 > /sys/class/gpio/export
bash: echo: write error: Invalid argument
How can I export these gpio?
How did you come with the number 62?
since the pi15 is the number 61 I assumed that the pi16 was the next and therefore the number 62. Am I doing something wrong?
gpioNumber = (Port Letter - 'A') * 32 + pinNumber
in this case ('I'-'A') = 8
8*32 + 15 = 271 is the corresponding number
61 is PB29 which do not exist:
https://raw.githubusercontent.com/allwinner-zh/documents/master/A20/A20_Datasheet_v1.5_20150510.pdf
With the number 271 gives the same error. I would like to point out that I am using kernel 3.14.
However I solved it by editing the script.fex file.
Thanks