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+--- Thread: C++ GPIO seg fault on Rock64 using Pine64-CPP (/showthread.php?tid=7126)
C++ GPIO seg fault on Rock64 using Pine64-CPP - Jeff R - 02-04-2019
I'm trying to run the example.cpp that comes with Pine64-CPP from https://github.com/databit/Pine64-CPP
I am throwing segmentation faults when I run.
Initializationsucceeds:
The man-setup() call initialzes the board. I traced the success path to the following if statement in the setup() function in gpio.cpp
if((uint64_t)gpio_mem % PAGE_SIZE)
And I also traced the successful "this->gpioMap =" statement to the one that uses SUNXI_GPIO_BASE
In the example code, I initialize the pin with
man->pinMode (PI_GPIO_24, OUTPUT);
The pinMode function in gpio.cpp, launches _setPullupdn with gpio=78 and pud = 1. As expected
Inside _setPullupdn, the following is set
bank= 2
index = 0
offset = 28
The segmentation fault seems to come from this line in gpio.c
regval = *(&pio->PULL[0] + index);
I have a 4 GB Rock64 running armbian bionic desktop from https://www.armbian.com/rock64/
sudo cat /sys/kernel/debug/gpio gives me
GPIOs 0-31, platform/pinctrl, gpio0:
gpio-0 ( |vcc_host_5v ) out hi
gpio-2 ( |? ) out lo
gpio-30 ( |vcc_sd ) out lo
GPIOs 32-63, platform/pinctrl, gpio1:
gpio-50 ( |mdio-reset ) out hi
GPIOs 64-95, platform/pinctrl, gpio2:
GPIOs 96-127, platform/pinctrl, gpio3:
GPIOs 510-511, platform/rk8xx-gpio, rk8xx-gpio, can sleep:
gpio-510 ( |? ) out lo
gpio-511 ( |? ) out lo
Anyone have any thoughts?
Thanks.
RE: C++ GPIO seg fault on Rock64 using Pine64-CPP - Jeff R - 02-06-2019
So, I never resolved the problems with the Pine64-CPP library but I found an alternate.
First, I used bash scripts to make sure the Rock64 was working, and I had the right pin addresses.
https://github.com/Leapo/Rock64-BashGPIO
I used the table table from this website to correctly identify the gpio indices.
https://github.com/Leapo/Rock64-R64.GPIO...GPIO-Modes
I used the items from the column lableled GPIO# (ROCK)
Lastly, I used the GPIO Class from the following.
Even though it is was created for the Raspberry Pi, I found that it correctly manipulated the files in /sys/class/gpio on my Rock64.
https://github.com/halherta/RaspberryPi-GPIOClass-v2
Note: I have only tested the GPIO read function, since that is what I'm trying to do for my project.
Edit 2/20/19
The GPIO Class approach only worked in C++. For a C version, I used the sysfs code from this site:
https://elinux.org/RPi_GPIO_Code_Samples
However, to use the Rock64 GPIO assignments from 100 to 103, I needed to change #define BUFFER_MAX 3 to #define BUFFER_MAX 4.
This may break things for two digit GPIO assignments. I didn't really test that