diff options
| author | Andreas Klinger <ak@it-klinger.de> | 2017-01-31 21:03:45 +0300 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2017-02-04 15:19:20 +0300 |
| commit | feda2840040fcf87d826b0aec945a98222e656ba (patch) | |
| tree | f595e7b7a67b53e1c69516ad8594540263f219e4 /drivers/iio/proximity/Makefile | |
| parent | 2fb5904d92d42c88432cb29f567654d28f9d6411 (diff) | |
| download | linux-feda2840040fcf87d826b0aec945a98222e656ba.tar.xz | |
iio: distance: add devantech us ranger srf04
This patch adds support for the ultrasonic ranger srf04 of devantech.
This device is measuring the distance of objects in a range between 1 cm
and 3 meters and a theoretical resolution of 3 mm.
There are two GPIOs used:
- trigger: set as output to the device when the measurement should start
- echo: set by the device when the ultrasonic wave is sent out and reset
when the echo is recognized; this needs to be an interrupt input
The time between setting and resetting the echo pin is the time the
waveform needed for one round trip. This time is recorded in the interrupt
handler.
The distance is calculated in the read function by using the ultrasonic
speed at 20 degrees celsius which is about 343 m/s.
Signed-off-by: Andreas Klinger <ak@it-klinger.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/proximity/Makefile')
| -rw-r--r-- | drivers/iio/proximity/Makefile | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile index e914c2a5dd49..ed1b6f4cc209 100644 --- a/drivers/iio/proximity/Makefile +++ b/drivers/iio/proximity/Makefile @@ -5,5 +5,6 @@ # When adding new entries keep the list in alphabetical order obj-$(CONFIG_AS3935) += as3935.o obj-$(CONFIG_LIDAR_LITE_V2) += pulsedlight-lidar-lite-v2.o +obj-$(CONFIG_SRF04) += srf04.o obj-$(CONFIG_SRF08) += srf08.o obj-$(CONFIG_SX9500) += sx9500.o |