SysFs接口.我无法在Xilinx的板上(Zybo等)导出gpio引脚 [英] SysFs interface. I can't export gpio pins in a Xilinx's Board (Zybo and other)

问题描述

使用此处所述的编译的Linux内核，我正在尝试在以下Wiki上导致LED闪烁: Linux GPIO驱动程序.我正在使用Xilinx的Zybo开发板.

Using a linux-kernel compiled as it is described here, I'm trying to make a led blinking following this wiki: Linux GPIO Driver. I'm working with a Zybo-board of Xilinx.

我启用了内核选项:

CONFIG_GPIO_SYSFS=y
CONFIG_SYSFS=y
CONFIG_GPIO_XILINX=y

我检查是否已将SysF安装在/sys中

I checked that I have mounted in /sys the SysFs

我想配置MIO端口的引脚7，因为它连接到板上的led LD4.所以我用了这个表达式:

I want to configure the pin 7 of the MIO port because it is attached to the led LD4 in the board. So I used this expression:

echo 7 > /sys/class/gpio/export

我总是会收到此错误:

export_store: invalid GPIO 7
ash: write error: Invalid argument

我也尝试导出值145 (138+7)，因为在这里找到了相应的解释: forum_link 和86，因为此人可以正常运行 basic_example .但是我总是遇到同样的错误.

I have also tried to export the values 145 (138+7) because of the explanation I found here: forum_link and 86 because this guy got the things working basic_example. But I always obtained the same error.

能给我一些帮助吗?也许我必须使用其他偏移量?还是与权限配置有关?

Could you give me some help? Maybe a I have to use other offset? Or is it more related with permission configuration??

推荐答案

我遇到了同样的问题.解决方案是添加906作为"address-gpio"的基础".例如，如果要管理连接到MIO 7的PS的引脚，则应执行以下操作:

I faced the same problem. The solution is to add 906 as a "base" of the "address-gpio". For example, if you want to manage the pin of the PS connected to MIO 7, you should do something like this:

zynq> echo 913 > /sys/class/gpio/export
zynq> echo out > /sys/class/gpio/gpio913/direction
zynq> echo 1 > /sys/class/gpio/gpio913/value

(当然906 + 7 = 913).

(where 906+7=913 of course).

或者，如果您想将其关闭:

Or, if you want to switch it off:

 zynq> echo 0 > /sys/class/gpio/gpio913/value

如何找到该值?好吧，就我而言，我很幸运:如果您查看

How do I find this value? Well, in my case I was just lucky: if you have a look in

ls /sys/class/gpio

您可以看到它已经存在gpiochip906.进入该目录，并查看文件base(例如，使用"less"):当然只有906值

you can see that it already exists gpiochip906. Go inside this directory and have a look inside the file base (using "less" for example): there is only the value 906 of course

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