Hello, how to use GPIO from python or shell?
shell ist described here:
maybe you have to use the kernel from github
Thanks, i used kernel from github, but GPIO from shell dosn’t work.
I have not tried yet…on which point is the problem (sysfile exists? Writable? Set but nothing happens?)
Have you read the comments below (some gpio not ready): For GPIO22/GPIO23/GPIO24, we need to set EINTx_BOND_DIS to 1.
Using that functions you must call:
mt_gpio_mode pin mode #no idea,what mode is,maybe pwm,digital or similar
mt_gpio_dir pin dir #dir seems to be in or out
And then write/read the pin with “mt_gpio_out pin value” / “mt_gpio_in pin”
@garywang is that right? Can you explain mode?
i use gpio scheme https://bananapi.gitbooks.io/banana-pi-bpi-r2-open-source-smart-router/content/bpi-r2-gpio-pin-define.html and i have enable gpio 23, but command echo “mode 23 1” > /sys/devices/platform/1000b000.pinctrl/mt_gpio not work, but work echo “mode 25 1” > /sys/devices/platform/1000b000.pinctrl/mt_gpio for pin 16
pin16 is gpio 23, see garys comment, i’ve posted (22-24 not ready yet)…please use another gpio, e.g. 17 (pin11) or 18 (pin 12)
tried with GPIO 18 = Pin12 (seems not working)
have an led with resistor on pin 12 and gnd next to it (pin 14) led stays off
root@bpi-iot-ros-ai:~# echo "dir 12 1">/sys/devices/platform/1000b000.pinctrl/mt_gpio root@bpi-iot-ros-ai:~# echo "out 12 1">/sys/devices/platform/1000b000.pinctrl/mt_gpio root@bpi-iot-ros-ai:~# cat /sys/devices/platform/1000b000.pinctrl/mt_gpio gpio base is 233, total num is 279 PIN: [MODE] [DIR] [DOUT] [DIN] [PULL_EN] [PULL_SEL] [IES] [SMT] [DRIVE] ( [R1] [R0] ) ... 12: 1 0 1 1-1-1-1-1 0 ...
As i see, dir will not be written…
Edit: currently dir is inverted… further debugging in https://github.com/BPI-SINOVOIP/BPI-R2-bsp/issues/17
all work fine! But i doesn’t detect press button on GPIO 200
You have changed direction to “in” instead of “out”?
Yes, but in kernel 4.4.70 GPIO200 not in list /sys/devices/platform/1000b000.pinctrl/mt_gpio
have you tried the mem-patch? else i have no idea (you can try also 4.14)…maybe @garywang
To get the Pin status, please run command echo “start 200" > /sys/devices/platform/1000b000.pinctrl/mt_gpio, and then cat /sys/devices/platform/1000b000.pinctrl/mt_gpio
cat /sys/devices/platform/1000b000.pinctrl/mt_gpio | grep 200 200: 0 1 0 0-1-1-1-1 0
if button pressed, values not changed
Whats the way to use GPIO 206 as PWM ? Can you write me the Commands for e.g. 50Hz/ 1KHz PWM´s please.
Thanks a lot, René
Please set the GPIO206 as PWM.
Please follow below command to configure PWM:
echo 3 >/sys/class/pwm/pwmchip0/export
echo 200000 >/sys/class/pwm/pwmchip0/pwm3/period
echo 100000 >/sys/class/pwm/pwmchip0/pwm3/duty_cycle
echo 1 >/sys/class/pwm/pwmchip0/pwm3/enable
Please refer to link: https://github.com/BPI-SINOVOIP/BPI-R2-bsp/issues/3
I’m not sure what happened on your board, Please make sure GPIO200 is as GPIO mode, and in input state. And maybe you need the command “pullsel 200 1” or “pullsel 200 0” to validate the PIN input state.
Remember the access to gpio in 4.14 is different to 4.4
You can download a 4.4 compiled kernel from my gdrive
i know … but is pwm also possible with 4.14 ?
Please say me what is right run GPIO mode on pin 200?