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base-files: gpio switch: set output value with direction

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Use the "low" and "high" values to configure the GPIO as an output with
that initial value. It ensures that the gpio doesn't have a unwanted value
during the time the direction is set to ouput and the actual value is
applied.

We don't need to take care of the GPIO polarity for now, since our
exported GPIOs are always active low.

Signed-off-by: Mathias Kresin <dev@kresin.me>
This commit is contained in:
Mathias Kresin 2017-12-21 01:06:42 +01:00
parent ff874b656b
commit e66c47fb14
2 changed files with 3 additions and 4 deletions
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2
package/base-files/Makefile
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@ -12,7 +12,7 @@ include $(INCLUDE_DIR)/version.mk
include $(INCLUDE_DIR)/feeds.mk
PKG_NAME:=base-files
PKG_RELEASE:=181
PKG_RELEASE:=182
PKG_FLAGS:=nonshared
PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/

5
package/base-files/files/etc/init.d/gpio_switch
View file

@ -22,10 +22,9 @@ load_gpio_switch()
echo "$gpio_pin" >/sys/class/gpio/export
# we need to wait a bit until the GPIO appears
[ -d "$gpio_path" ] || sleep 1
echo out >"$gpio_path/direction"
}
# write 0 or 1 to the "value" field
{ [ "$value" = "0" ] && echo "0" || echo "1"; } >"$gpio_path/value"
# set the pin to output with high or low pin value
{ [ "$value" = "0" ] && echo "high" || echo "low"; } >"$gpio_path/direction"
}
service_triggers()