<div dir="ltr">Simon,<div style>In my experience, there is no single place to get all of the information you need, especially for specific device driver development. In addition, it has taken me a while to feel comfortable navigating the RTEMS source tree and being able to quickly locate BSPs, drivers, and libraries. </div>
<div style><br></div><div style>Here are the docs that I know of:</div><div style>Starting point: <a href="http://www.rtems.org/onlinedocs.html">http://www.rtems.org/onlinedocs.html</a><br></div><div style><br></div><div style>
Manuals for developing RTEMS applications:</div><div style><a href="http://rtems.org/onlinedocs/doc-current/share/rtems/html/">http://rtems.org/onlinedocs/doc-current/share/rtems/html/</a><br></div><div style><br></div><div style>
Doxygen for the cpukit ( but why is that directory called cpukit? )</div><div style><a href="http://www.rtems.org/onlinedocs/doxygen/cpukit/html/">http://www.rtems.org/onlinedocs/doxygen/cpukit/html/</a><br></div><div style>
<br></div><div style>For the Raspberry Pi: I was hoping to start with the I2C driver shortly. It seems there are two options:</div><div style>1. A standalone I2C driver similar to the one in the arm/lpc32xx BSP:</div><div style>
<a href="http://git.rtems.org/rtems/tree/c/src/lib/libbsp/arm/lpc32xx/misc/i2c.c">http://git.rtems.org/rtems/tree/c/src/lib/libbsp/arm/lpc32xx/misc/i2c.c</a><br></div><div style><br></div><div style>2. A driver for libi2c similar to the one in the arm/lpc24xx BSP:</div>
<div style><a href="http://git.rtems.org/rtems/tree/c/src/lib/libbsp/arm/lpc24xx/i2c">http://git.rtems.org/rtems/tree/c/src/lib/libbsp/arm/lpc24xx/i2c</a><br></div><div style><br></div><div style>This readme file gives a pretty good overview of libi2c:</div>
<div style><a href="http://git.rtems.org/rtems/tree/cpukit/libi2c/README_libi2c">http://git.rtems.org/rtems/tree/cpukit/libi2c/README_libi2c</a><br></div><div style><br></div><div style>I was going to start with a simple i2c driver for the Rpi, then try to implement a libi2c driver when I had a little more experience with it.</div>
<div style><br></div><div style>Same with the SPI/SD card access: I'm pretty sure I saw a good example of using the SPI bus to access a SD card , but I can't find it right now ( exactly your point! ) </div><div style>
<br></div><div style>Also, here is another GPIO driver for the Raspberry Pi. I was able to use this for reading button states and lighting multiple LEDs. </div><div style><a href="https://github.com/pficheux/raspberry_pi">https://github.com/pficheux/raspberry_pi</a><br>
</div><div style><br></div><div style>But feel free to ask more questions: I would like to help with the I2c implementation. </div><div style><br></div><div style>Alan</div><div style><br></div><div style><br></div><div style>
<br></div><div style><br></div><div style><br></div><div style><br></div><div style><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Sep 9, 2013 at 5:20 AM, Simon Williams <span dir="ltr"><<a href="mailto:williamssimonp@gmail.com" target="_blank">williamssimonp@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>I have made some progress with the work I have been doing for the Raspberry Pi, but I am finding that progress is being held up due to lack of information about RTEMS. Is there a repository of information I am not aware of?</div>
<div><br></div><div>I have a GPIO driver which allows me to have an RTEMS task that switches an external LED on and off. The is based on the description of the discrete driver in the BSP and Device Driver Development Guide, but that description is almost non-existent! There also does not appear to be any sample implementation anywhere. I have one specific issue with my implementation, which is that stat() does not return anything useful and so I have to use the deprecated RTEMS specific call to get information about the devices. This leads me to believe that I have not got it quite right! </div>
<div><br></div><div>My next targets are I2C, followed by a driver to put the console on an <span style="color:rgb(68,68,68);font-family:arial,sans-serif;line-height:16px">HD44780 compatible display and keyboard attached to the I2C bus. After that, I will be looking at an SD card filesystem and other I2C devices I need for my application. I would be extremely grateful if anyone could point me towards some well documented examples of these sort of drivers for other boards, I would be grateful. The problem with most of the examples I have found in the repository is that any documentation that they contain assumes that the reader has a good knowledge of RTEMS and it's requirements and it is that knowledge that I am trying to gain!</span></div>
<div><span style="color:rgb(68,68,68);font-family:arial,sans-serif;line-height:16px"><br></span></div><div><span style="color:rgb(68,68,68);font-family:arial,sans-serif;line-height:16px">I would also be interested to know if there is any documentation I have not been able to find on using the C++ class library as my application level code will be written in C++.</span></div>
<div><span style="color:rgb(68,68,68);font-family:arial,sans-serif;line-height:16px"><br></span></div><div><span style="color:rgb(68,68,68);font-family:arial,sans-serif;line-height:16px">Thanks in advance for your help.</span></div>
<div><br></div></div>
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