vsergeev
Support for Raspberry Pi 5
I'm having trouble getting this library to work on a Raspberry Pi 5. My understanding is that GPIO support has a few breaking changes on the Pi 5; this may or may not be related to my issue.
I've installed lua-periphery with luarocks and am using Lua 5.1. I'm on Bookworm and Linux kernel 6.6.
When using the sysfs GPIO mode I get the following error:
Opening GPIO: writing 'export': Invalid argument [errno 22]
When attempting to use the character device GPIO mode (to target /dev/gpiochip4), I get the following error.
c-periphery library built without character device GPIO support.
Let me know if there's any further information I can provide or any additional tests to run. Thanks for the help!
Hmm, strange that it wasn't built with character device GPIO support. It could be a bug with the GPIO cdev support tests in the c-periphery Makefile. Do you happen to have a log of the LuaRocks build?
I ended up trying with different Lua versions to no avail. The following log is with Lua 5.4.
LuaRocks log
Installing https://luarocks.org/lua-periphery-2.4.2-1.src.rock
lua-periphery 2.4.2-1 depends on luarocks-fetch-gitrec >= 0.2 (0.2-2 installed: success)
lua-periphery 2.4.2-1 depends on lua >= 5.1 (5.4-1 provided by VM: success)
Warning: variable CFLAGS was not passed in build_variables
cd c-periphery; make
make[1]: Entering directory '/tmp/luarocks_lua-periphery-2.4.2-1-5101674/lua-periphery/c-periphery'
mkdir obj
gcc -std=gnu99 -pedantic -O3 -Wall -Wextra -Wno-stringop-truncation -fPIC -DPERIPHERY_VERSION_COMMIT=\"\" -DPERIPHERY_GPIO_CDEV_SUPPORT=0 -c src/gpio.c -o obj/gpio.o
gcc -std=gnu99 -pedantic -O3 -Wall -Wextra -Wno-stringop-truncation -fPIC -DPERIPHERY_VERSION_COMMIT=\"\" -DPERIPHERY_GPIO_CDEV_SUPPORT=0 -c src/gpio_cdev_v2.c -o obj/gpio_cdev_v2.o
gcc -std=gnu99 -pedantic -O3 -Wall -Wextra -Wno-stringop-truncation -fPIC -DPERIPHERY_VERSION_COMMIT=\"\" -DPERIPHERY_GPIO_CDEV_SUPPORT=0 -c src/gpio_cdev_v1.c -o obj/gpio_cdev_v1.o
gcc -std=gnu99 -pedantic -O3 -Wall -Wextra -Wno-stringop-truncation -fPIC -DPERIPHERY_VERSION_COMMIT=\"\" -DPERIPHERY_GPIO_CDEV_SUPPORT=0 -c src/gpio_sysfs.c -o obj/gpio_sysfs.o
gcc -std=gnu99 -pedantic -O3 -Wall -Wextra -Wno-stringop-truncation -fPIC -DPERIPHERY_VERSION_COMMIT=\"\" -DPERIPHERY_GPIO_CDEV_SUPPORT=0 -c src/led.c -o obj/led.o
gcc -std=gnu99 -pedantic -O3 -Wall -Wextra -Wno-stringop-truncation -fPIC -DPERIPHERY_VERSION_COMMIT=\"\" -DPERIPHERY_GPIO_CDEV_SUPPORT=0 -c src/pwm.c -o obj/pwm.o
gcc -std=gnu99 -pedantic -O3 -Wall -Wextra -Wno-stringop-truncation -fPIC -DPERIPHERY_VERSION_COMMIT=\"\" -DPERIPHERY_GPIO_CDEV_SUPPORT=0 -c src/spi.c -o obj/spi.o
gcc -std=gnu99 -pedantic -O3 -Wall -Wextra -Wno-stringop-truncation -fPIC -DPERIPHERY_VERSION_COMMIT=\"\" -DPERIPHERY_GPIO_CDEV_SUPPORT=0 -c src/i2c.c -o obj/i2c.o
gcc -std=gnu99 -pedantic -O3 -Wall -Wextra -Wno-stringop-truncation -fPIC -DPERIPHERY_VERSION_COMMIT=\"\" -DPERIPHERY_GPIO_CDEV_SUPPORT=0 -c src/mmio.c -o obj/mmio.o
gcc -std=gnu99 -pedantic -O3 -Wall -Wextra -Wno-stringop-truncation -fPIC -DPERIPHERY_VERSION_COMMIT=\"\" -DPERIPHERY_GPIO_CDEV_SUPPORT=0 -c src/serial.c -o obj/serial.o
gcc -std=gnu99 -pedantic -O3 -Wall -Wextra -Wno-stringop-truncation -fPIC -DPERIPHERY_VERSION_COMMIT=\"\" -DPERIPHERY_GPIO_CDEV_SUPPORT=0 -c src/version.c -o obj/version.o
ar rcs periphery.a obj/gpio.o obj/gpio_cdev_v2.o obj/gpio_cdev_v1.o obj/gpio_sysfs.o obj/led.o obj/pwm.o obj/spi.o obj/i2c.o obj/mmio.o obj/serial.o obj/version.o
make[1]: Leaving directory '/tmp/luarocks_lua-periphery-2.4.2-1-5101674/lua-periphery/c-periphery'
gcc -std=c99 -pedantic -D_XOPEN_SOURCE=700 -Wall -Wextra -Wno-unused-parameter -fPIC -I. -I/usr/local/include -shared src/lua_periphery.c src/lua_mmio.c src/lua_gpio.c src/lua_led.c src/lua_pwm.c src/lua_spi.c src/lua_i2c.c src/lua_serial.c c-periphery/periphery.a -o periphery.so
mkdir -p /usr/local/lib/luarocks/rocks-5.4/lua-periphery/2.4.2-1/lib
cp periphery.so /usr/local/lib/luarocks/rocks-5.4/lua-periphery/2.4.2-1/lib/periphery.so
lua-periphery 2.4.2-1 is now installed in /usr/local (license: MIT/X11)
It's clear that DPERIPHERY_GPIO_CDEV_SUPPORT in the Makefile is evaluating to 0, but I'm not sure why. I do appear to have a gpio.h file in /usr/include/linux/ with the macro and enum that are being checked for.
I had the same issue on rpi zero 2
I fixed it by building lua-periphery from source and before building changing line 23 in lua-periphery/c-periphery/Makefile to :
CFLAGS += -DPERIPHERY_VERSION_COMMIT=\"$(COMMIT_ID)\" -DPERIPHERY_GPIO_CDEV_SUPPORT=1
