zephyr/samples/drivers/i2s/litex
Tomasz Bursztyka e18fcbba5a device: Const-ify all device driver instance pointers
Now that device_api attribute is unmodified at runtime, as well as all
the other attributes, it is possible to switch all device driver
instance to be constant.

A coccinelle rule is used for this:

@r_const_dev_1
  disable optional_qualifier
@
@@
-struct device *
+const struct device *

@r_const_dev_2
 disable optional_qualifier
@
@@
-struct device * const
+const struct device *

Fixes #27399

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
2020-09-02 13:48:13 +02:00
..
src device: Const-ify all device driver instance pointers 2020-09-02 13:48:13 +02:00
CMakeLists.txt
README.rst
prj.conf
sample.yaml

README.rst

.. _i2s_litex_example:

#####################
I2S example
#####################

Overview
********

This is a simple I2S audio transceiver example. You can plug any source of music and listen to it.

Audio Format
************

The driver requires and provides Audio data with the following parameters:

* 44100 kHz sample rate
* Signed 24 bit PCM
* Stereo
* Little endian

Building
********

.. code-block::

   mkdir build && cd build
   cmake -DBOARD=litex_vexriscv ..
   make

Known issues
************

It seems that after a few minutes some music delay occurs, this is because the sound driver is not able to send data as fast as it receives it.