sample_gpio_driver.html

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  len = pflags_proc_output <span class="br0">&#40;</span>page<span class="br0">&#41;</span>;
  <span class="kw1">if</span> <span class="br0">&#40;</span>len &lt;= off + count<span class="br0">&#41;</span>
    *eof = <span class="nu0">1</span>;
  *start = page + off;
  len -= off;
  <span class="kw1">if</span> <span class="br0">&#40;</span>len &gt; count<span class="br0">&#41;</span>
    len = count;
  <span class="kw1">if</span> <span class="br0">&#40;</span>len &lt; <span class="nu0">0</span><span class="br0">&#41;</span>
    len = <span class="nu0">0</span>;
  <span class="kw1">return</span> len;
<span class="br0">&#125;</span>
&nbsp;
<span class="co1">// simpler vesion</span>
&nbsp;
<span class="kw4">static</span> <span class="kw4">int</span>
pflags_simper_read_proc <span class="br0">&#40;</span><span class="kw4">char</span> *page, <span class="kw4">char</span> **start, off_t off,
                  <span class="kw4">int</span> count, <span class="kw4">int</span> *eof, <span class="kw4">void</span> *data<span class="br0">&#41;</span>
<span class="br0">&#123;</span>
  <span class="kw4">int</span> len = <span class="nu0">0</span>;
  
  <span class="kw1">if</span> <span class="br0">&#40;</span> off == <span class="nu0">0</span> <span class="br0">&#41;</span> <span class="br0">&#123;</span>
      len = pflags_proc_output <span class="br0">&#40;</span>page<span class="br0">&#41;</span>;
  <span class="br0">&#125;</span>
&nbsp;
  <span class="kw1">return</span> len;
<span class="br0">&#125;</span>
&nbsp;
&nbsp;</pre>
<p>
 The code to write the data into the <strong>page</strong> buffer follows
</p>
<pre class="code c"><span class="kw4">static</span> <span class="kw4">int</span>
pflags_proc_output <span class="br0">&#40;</span><span class="kw4">char</span> *buf<span class="br0">&#41;</span>
<span class="br0">&#123;</span>
  <span class="kw4">char</span> *p;
 
 <span class="kw4">unsigned</span> <span class="kw4">short</span> i, data,dir,maska,maskb,polar,edge,inen,both;
&nbsp;
  p = buf;
&nbsp;
  data = *pFIO_FLAG_D;
  dir = *pFIO_DIR;
  maska = *pFIO_MASKA_D;
  maskb = *pFIO_MASKB_D;
  polar = *pFIO_POLAR;
  both = *pFIO_BOTH;
  edge = *pFIO_EDGE;
  inen = *pFIO_INEN;
&nbsp;
&nbsp;
  p += sprintf <span class="br0">&#40;</span>p, <span class="st0">"FIO_DIR <span class="es0">\t</span>: = 0x%X<span class="es0">\n</span>"</span>, dir<span class="br0">&#41;</span>;
  p += sprintf <span class="br0">&#40;</span>p, <span class="st0">"FIO_MASKA<span class="es0">\t</span>: = 0x%X<span class="es0">\n</span>"</span>, maska<span class="br0">&#41;</span>;
  p += sprintf <span class="br0">&#40;</span>p, <span class="st0">"FIO_MASKB<span class="es0">\t</span>: = 0x%X<span class="es0">\n</span>"</span>, maskb<span class="br0">&#41;</span>;
  p += sprintf <span class="br0">&#40;</span>p, <span class="st0">"FIO_POLAR<span class="es0">\t</span>: = 0x%X<span class="es0">\n</span>"</span>, polar<span class="br0">&#41;</span>;
  p += sprintf <span class="br0">&#40;</span>p, <span class="st0">"FIO_EDGE <span class="es0">\t</span>: = 0x%X<span class="es0">\n</span>"</span>, edge<span class="br0">&#41;</span>;
  p += sprintf <span class="br0">&#40;</span>p, <span class="st0">"FIO_INEN <span class="es0">\t</span>: = 0x%X<span class="es0">\n</span>"</span>, inen<span class="br0">&#41;</span>;
  p += sprintf <span class="br0">&#40;</span>p, <span class="st0">"FIO_BOTH <span class="es0">\t</span>: = 0x%X<span class="es0">\n</span>"</span>, both<span class="br0">&#41;</span>;
  p += sprintf <span class="br0">&#40;</span>p, <span class="st0">"FIO_FLAG_D<span class="es0">\t</span>: = 0x%X<span class="es0">\n</span>"</span>, data<span class="br0">&#41;</span>;
  p += sprintf <span class="br0">&#40;</span>p, <span class="st0">"PIN<span class="es0">\t</span>:DATA DIR INEN EDGE BOTH POLAR MASKA MASKB<span class="es0">\n</span>"</span><span class="br0">&#41;</span>;
  p += sprintf <span class="br0">&#40;</span>p, <span class="st0">"   <span class="es0">\t</span>:H/L  O/I D/E  E/L  B/S   L/H   S/C   S/C<span class="es0">\n</span>"</span><span class="br0">&#41;</span>;
&nbsp;
  <span class="kw1">for</span> <span class="br0">&#40;</span>i = <span class="nu0">0</span>; i &lt; <span class="nu0">16</span>; i++<span class="br0">&#41;</span>
    p += sprintf <span class="br0">&#40;</span>p, <span class="st0">"PF%d<span class="es0">\t</span>: %d....%d....%d....%d....%d....%d.....%d.....%d <span class="es0">\n</span>"</span>, 
                     i, 
                     <span class="br0">&#40;</span><span class="br0">&#40;</span>data &gt;&gt; i<span class="br0">&#41;</span> &amp; <span class="nu0">1</span><span class="br0">&#41;</span>, 
                     <span class="br0">&#40;</span><span class="br0">&#40;</span>dir &gt;&gt; i<span class="br0">&#41;</span> &amp; <span class="nu0">1</span><span class="br0">&#41;</span>,
                     <span class="br0">&#40;</span><span class="br0">&#40;</span>inen &gt;&gt; i<span class="br0">&#41;</span> &amp; <span class="nu0">1</span><span class="br0">&#41;</span>,
                     <span class="br0">&#40;</span><span class="br0">&#40;</span>edge &gt;&gt; i<span class="br0">&#41;</span> &amp; <span class="nu0">1</span><span class="br0">&#41;</span>,
                     <span class="br0">&#40;</span><span class="br0">&#40;</span>both &gt;&gt; i<span class="br0">&#41;</span> &amp; <span class="nu0">1</span><span class="br0">&#41;</span>,
                     <span class="br0">&#40;</span><span class="br0">&#40;</span>polar &gt;&gt; i<span class="br0">&#41;</span> &amp; <span class="nu0">1</span><span class="br0">&#41;</span>,
                     <span class="br0">&#40;</span><span class="br0">&#40;</span>maska &gt;&gt; i<span class="br0">&#41;</span> &amp; <span class="nu0">1</span><span class="br0">&#41;</span>,
                     <span class="br0">&#40;</span><span class="br0">&#40;</span>maskb &gt;&gt; i<span class="br0">&#41;</span> &amp; <span class="nu0">1</span><span class="br0">&#41;</span><span class="br0">&#41;</span>;
&nbsp;
&nbsp;
   <span class="kw1">return</span> p - buf;
<span class="br0">&#125;</span>
&nbsp;</pre>
</div>
<!-- SECTION [8125-10514] -->
<h3><a name="test_the_driver" id="test_the_driver">Test the Driver</a></h3>
<div class="level3">

<p>
There is an existing test program now. In order to successfully build and run the PFLAGS Test Application, following kernel and user space adjustments needs to be done.
</p>

<p>
1) In your uClinux-dist folder enter:
</p>

<p>
#make menuconfig 
</p>
<pre class="code">       [ ] Default all settings (lose changes)
       [*] Customize Kernel Settings (NEW)
       [*] Customize Vendor/User Settings (NEW)
       [ ] Update Default Vendor Settings</pre>

<p>
Check Customize Kernel Settings and Customize Vendor/User Settings, then save and exit During kernel configuration under &lsquo;Character devices&rsquo;, Blackfin BF533/2/1 Programmable Flags Driver&rsquo;. 
</p>
<pre class="code">           [ ] Blackfin BF533/2/1 SPI port support
           [ ] Blackfin BF533/2/1 ADSP SPI ADC support
           [*] Blackfin BF533/2/1 Programmable Flags Driver
           [ ] Virtual terminal
           [ ] Non-standard serial port support
               Serial drivers  ---&gt;
           [*] Unix98 PTY support
           [*] Legacy (BSD) PTY support
           (256) Maximum number of legacy PTY in use
           [ ] QIC-02 tape support
               IPMI  ---&gt;
               Watchdog Cards  ---&gt;
           [ ] Enhanced Real Time Clock Support
           [ ] Generic /dev/rtc emulation
           [*] Blackfin Real Time Clock Support
           [*] Blackfin Power Management support
           [ ] Double Talk PC internal speech card support
           [ ] Siemens R3964 line discipline
               Ftape, the floppy tape device driver  ---&gt;
           [ ] /dev/agpgart (AGP Support)
           [ ] Direct Rendering Manager (XFree86 4.1.0 and higher DRI support)
           [ ] RAW driver (/dev/raw/rawN) (OBSOLETE)</pre>

<p>
 Save and exit. We are now leaving kernel configuration and enter user space configuration. Here we need to enable &lsquo;PFLAGS test program&rsquo; under &lsquo;Blackfin test programs&rsquo;. 
</p>
<pre class="code">                         Core Applications  ---&gt;
                         Library Configuration  ---&gt;
                         Flash Tools  ---&gt;
                         Filesystem Applications  ---&gt;
                         Network Applications  ---&gt;
                         Miscellaneous Applications  ---&gt;
                         BusyBox  ---&gt;
                         Tinylogin  ---&gt;
                         MicroWindows  ---&gt;
                         Games  ---&gt;
                         Miscellaneous Configuration  ---&gt;
                         Debug Builds  ---&gt;
                         Blackfin test programs  ---&gt;
                         Blackfin app programs  ---&gt;</pre>
<pre class="code">                                      [ ] RTC test program
                                      [ ] DPMC test program
                                      [ ] AUDIO test program
                                      [ ] VIDEO test program
                                      [*] PFLAGS test program
                                      [ ] Still to write</pre>

<p>
 Save and exit
</p>

<p>
2) Recompile kernel and user space
</p>

<p>
3) Starting the Application: From the shell, input cmd :pflags_test 
</p>
<pre class="code"> root:~&gt; pflags_test</pre>

<p>
 ########################## PFLAGS TEST ############################### open success /dev/pf2 open success /dev/pf5
</p>

<p>
Press BTN1 to EXIT root:~&gt;
</p>

<p>
This will toggle STAMP board LED1 until Button1 is pressed.
</p>

<p>
4) Test PROC filesystem interface
</p>

<p>
From the shell type: cat /proc/driver/pflags
</p>

</div>
<!-- SECTION [10515-13904] -->
<h3><a name="sample_proc_output" id="sample_proc_output">Sample Proc Output</a></h3>
<div class="level3">

<p>
Here is an example of the <strong>/proc</strong> output
</p>
<pre class="code">
FIO_DIR         : = 0x1F
FIO_MASKA       : = 0x0
FIO_MASKB       : = 0x80
FIO_POLAR       : = 0x160
FIO_EDGE        : = 0x0
FIO_INEN        : = 0x1E0
FIO_BOTH        : = 0x0
FIO_FLAG_D      : = 0x1D
PIN     :DATA DIR INEN EDGE BOTH POLAR MASKA MASKB
        :H/L  O/I D/E  E/L  B/S   L/H   S/C   S/C
PF0     : 1....1....0....0....0....0.....0.....0
PF1     : 0....1....0....0....0....0.....0.....0
PF2     : 1....1....0....0....0....0.....0.....0
PF3     : 1....1....0....0....0....0.....0.....0
PF4     : 1....1....0....0....0....0.....0.....0
PF5     : 0....0....1....0....0....1.....0.....0
PF6     : 0....0....1....0....0....1.....0.....0
PF7     : 0....0....1....0....0....0.....0.....1
PF8     : 0....0....1....0....0....1.....0.....0
PF9     : 0....0....0....0....0....0.....0.....0
PF10    : 0....0....0....0....0....0.....0.....0
PF11    : 0....0....0....0....0....0.....0.....0
PF12    : 0....0....0....0....0....0.....0.....0
PF13    : 0....0....0....0....0....0.....0.....0
PF14    : 0....0....0....0....0....0.....0.....0
PF15    : 0....0....0....0....0....0.....0.....0

</pre>

</div>
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