求助GPIOSET对先锋派GPIO口的控制

whtronyen

[root@LS2K0300-PI gpio]# echo 88 > /sys/class/gpio/export
[root@LS2K0300-PI gpio]# ls
export  gpio88  gpiochip0  unexport
[root@LS2K0300-PI gpio]# echo "out" > /sys/class/gpio/gpio88/direction
[root@LS2K0300-PI gpio]# echo 1 > /sys/class/gpio/gpio88/value
[root@LS2K0300-PI gpio]# cat gpio88/value
1
[root@LS2K0300-PI gpio]# echo 0 > /sys/class/gpio/gpio88/value
[root@LS2K0300-PI gpio]# cat gpio88/value
0
以上动作都能正常执行，但是我试图用GPIOSET对gpio88进行操控时，出现如下问题：
[root@LS2K0300-PI ~]# gpioset --help
Usage: gpioset [OPTIONS] <line=value>...

Set values of GPIO lines.

Lines are specified by name, or optionally by offset if the chip option
is provided.
Values may be '1' or '0', or equivalently 'active'/'inactive' or 'on'/'off'.

The line output state is maintained until the process exits, but after that
is not guaranteed.

Options:
      --banner          display a banner on successful startup
  -b, --bias <bias>     specify the line bias
                        Possible values: 'pull-down', 'pull-up', 'disabled'.
                        (default is to leave bias unchanged)
      --by-name         treat lines as names even if they would parse as an offset
  -c, --chip <chip>     restrict scope to a particular chip
  -C, --consumer <name> consumer name applied to requested lines (default is 'gpioset')
  -d, --drive <drive>   specify the line drive mode
                        Possible values: 'push-pull', 'open-drain', 'open-source'.
                        (default is 'push-pull')
  -h, --help            display this help and exit
  -l, --active-low      treat the line as active low
  -p, --hold-period <period>
                        the minimum time period to hold lines at the requested values
  -s, --strict          abort if requested line names are not unique
  -t, --toggle <period>[,period]...
                        toggle the line(s) after the specified period(s)
                        If the last period is non-zero then the sequence repeats.
      --unquoted        don't quote line names
  -v, --version         output version information and exit
  -z, --daemonize       set values then detach from the controlling terminal

Chips:
    A GPIO chip may be identified by number, name, or path.
    e.g. '0', 'gpiochip0', and '/dev/gpiochip0' all refer to the same chip.

Periods:
    Periods are taken as milliseconds unless units are specified. e.g. 10us.
    Supported units are 's', 'ms', and 'us'.

*Note*
    The state of a GPIO line controlled over the character device reverts to default
    when the last process referencing the file descriptor representing the device file exits.
    This means that it's wrong to run gpioset, have it exit and expect the line to continue
    being driven high or low. It may happen if given pin is floating but it must be interpreted
    as undefined behavior.
显示先锋派已经支持gpioset这个命令
[root@LS2K0300-PI ~]# gpioget gpiochip0 88
gpioget: cannot find line 'gpiochip0'
gpioget: cannot find line '88'
这个是什么原因导致？麻烦版主或者技术大佬帮忙解释一下。谢谢！

whtronyen

[root@LS2K0300-PI gpio]# gpioset gpiochip0 88=1
gpioset: invalid line value: 'gpiochip0'
明明前面采用echo命令都已经正常操作，采用gpioset命令时显示上述信息，不知何故？