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docs: Added more detail to iio doc

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Signed-off-by: Henry Bruce <henry.bruce@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
Henry Bruce
2015-12-03 15:54:11 -08:00
committed by Brendan Le Foll
parent 7703634bc5
commit 5f01de1bf1
1 changed files with 20 additions and 10 deletions
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30
docs/iio.md
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@@ -1,13 +1,29 @@
iio {#iio} iio {#iio}
=== ===
IIO is the kernel's framework for supporting sensors.
IIO is the kernel's framework for supporting sensors. You may need to recompile ## Using dummy_iio driver
a kernel and add, this is from kernel 4.2: For platforms without IIO hardware the iio_dummy driver can be used. You can add the driver by either rebuilding the kernel with IIO component enabled or just building the IIO modules and load them.
You must add the following config fragment. Known to work for kernel 3.19 and later.
<pre><code>
CONFIG_IIO_DUMMY_EVGEN=m CONFIG_IIO_DUMMY_EVGEN=m
CONFIG_IIO_SIMPLE_DUMMY=m CONFIG_IIO_SIMPLE_DUMMY=m
CONFIG_IIO_SIMPLE_DUMMY_EVENTS=y CONFIG_IIO_SIMPLE_DUMMY_EVENTS=y
CONFIG_IIO_SIMPLE_DUMMY_BUFFER=y CONFIG_IIO_SIMPLE_DUMMY_BUFFER=y
</code></pre>
### Add driver to kernel
Boot with new kernel, then load modules
<pre><code>
$ modprobe iio_dummy
$ modprobe iio_dummy_evgen
</code></pre>
### Load kernel modules
Depending our your kernel config, some of these modules may already be loaded.
<pre><code>
$ insmod drivers/iio/industrialio.ko
$ insmod drivers/iio/kfifo_buf.ko
$ insmod drivers/staging/iio/iio_dummy_evgen.ko
$ insmod drivers/staging/iio/iio_dummy.ko
</code></pre>
## 'RAW' access ## 'RAW' access
Mraa supports raw access Mraa supports raw access
@@ -23,10 +39,4 @@ Mraa supports raw access
Activate the trigger in /sys/class/iio Activate the trigger in /sys/class/iio
$ echo 1 > trigger0/trigger_now $ echo 1 > trigger0/trigger_now
## Testing without hardware
Create a dummy iio device
$ modprobe iio_dummy
Create a dummy iio event generator
$ modprobe iio_dummy_evgen