zephyr

History

Keith Packard 0b90fd5adf samples, tests, boards: Switch main return type from void to int As both C and C++ standards require applications running under an OS to return 'int', adapt that for Zephyr to align with those standard. This also eliminates errors when building with clang when not using -ffreestanding, and reduces the need for compiler flags to silence warnings for both clang and gcc. Most of these changes were automated using coccinelle with the following script: @@ @@ - void + int main(...) { ... - return; + return 0; ... } Approximately 40 files had to be edited by hand as coccinelle was unable to fix them. Signed-off-by: Keith Packard <keithp@keithp.com>		2023-04-14 07:49:41 +09:00
..
boards
src	samples, tests, boards: Switch main return type from void to int	2023-04-14 07:49:41 +09:00
CMakeLists.txt
prj.conf
README.rst
sample.yaml

README.rst

.. _memc:

MEMC Driver Sample
##################

Overview
********

This sample can be used with any memory controller driver that
memory maps external RAM. It is intended to demonstrate
the ability to read and write from the memory mapped region.

Note that the chosen region (set by ``sram-ext`` dt alias node) should not
overlap with memory used for XIP or SRAM by the application, as the sample
would overwrite this data


Building and Running
********************

This application can be built and executed on an RT595 EVK as follows:

.. zephyr-app-commands::
   :zephyr-app: samples/drivers/memc
   :host-os: unix
   :board: mimxrt595_evk_cm33
   :goals: run
   :compact:

To build for another board, change "mimxrt595_evk_cm33" above to that
board's name.

Sample Output
=============

.. code-block:: console

*** Booting Zephyr OS build zephyr-v3.2.0-2686-gd52d828c2bdc ***
Writing to memory region with base 0x38000000, size 0x800000

First 1KB of Data in memory:
\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=\=
00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f
10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f
20 21 22 23 24 25 26 27 28 29 2a 2b 2c 2d 2e 2f
....

Read data matches written data