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* Automatically exclude the pin for switchable backlight from keypad scanning

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in the 4bit and 8bit wiring. This fixes problems with flickering backlight if
  a slow parallel port is used. IMPORTANT: This may require a hardware change!
* In code comments use the same line names as in the user's guide (Y1/X1
  instead of Y0/X0).
* Add documentation about hd44780-ftdi's 4bit mode.
This commit is contained in:
mmdolze
2010-01-18 22:24:59 +00:00
parent 6fba5cef68
commit 59f3cbdb45
6 changed files with 208 additions and 64 deletions
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docs/lcdproc-user/drivers/hd44780.docbook
+122 -2
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@@ -827,6 +827,7 @@ The optional keypad can be connected as follows:
<entry namest="lpt1" nameend="lpt2" align="center">printer port</entry>
<entry morerows="1">&lt;-&gt;</entry>
<entry align="center">keypad</entry>
<entry morerows="1">remarks</entry>
</row>
<row>
<entry>name</entry>
@@ -840,42 +841,49 @@ The optional keypad can be connected as follows:
<entry>2</entry>
<entry></entry>
<entry>Y<subscript>1</subscript></entry>
<entry></entry>
</row>
<row>
<entry>D1</entry>
<entry>3</entry>
<entry></entry>
<entry>Y<subscript>2</subscript></entry>
<entry></entry>
</row>
<row>
<entry>D2</entry>
<entry>4</entry>
<entry></entry>
<entry>Y<subscript>3</subscript></entry>
<entry></entry>
</row>
<row>
<entry>D3</entry>
<entry>5</entry>
<entry></entry>
<entry>Y<subscript>4</subscript></entry>
<entry></entry>
</row>
<row>
<entry>D4</entry>
<entry>6</entry>
<entry></entry>
<entry>Y<subscript>5</subscript></entry>
<entry></entry>
</row>
<row>
<entry>D5</entry>
<entry>7</entry>
<entry></entry>
<entry>Y<subscript>6</subscript></entry>
<entry>Only if not used for backlight or 3<superscript>rd</superscript> controller.</entry>
</row>
<row>
<entry>nSTRB</entry>
<entry>1</entry>
<entry></entry>
<entry>Y<subscript>7</subscript></entry>
<entry morerows="3">Only if not used for additional controllers.</entry>
</row>
<row>
<entry>nLF</entry>
@@ -900,30 +908,35 @@ The optional keypad can be connected as follows:
<entry>10</entry>
<entry></entry>
<entry>X<subscript>1</subscript></entry>
<entry></entry>
</row>
<row>
<entry>BUSY</entry>
<entry>11</entry>
<entry></entry>
<entry>X<subscript>2</subscript></entry>
<entry></entry>
</row>
<row>
<entry>PAPEREND</entry>
<entry>12</entry>
<entry></entry>
<entry>X<subscript>3</subscript></entry>
<entry></entry>
</row>
<row>
<entry>SELIN</entry>
<entry>13</entry>
<entry></entry>
<entry>X<subscript>4</subscript></entry>
<entry></entry>
</row>
<row>
<entry>nFAULT</entry>
<entry>15</entry>
<entry></entry>
<entry>X<subscript>5</subscript></entry>
<entry></entry>
</row>
</tbody>
</tgroup>
@@ -1407,7 +1420,7 @@ The optional keypad can be connected as follows:
<entry>nSEL</entry>
<entry>17</entry>
<entry></entry>
<entry>Y<subscript>10</subscript></entry>
<entry>Y<subscript>10</subscript> (only if not used for backlight)</entry>
</row>
<row>
<entry>nACK</entry>
@@ -1858,6 +1871,106 @@ The wiring of the control lines can optionally be reconfigured,
please look at the driver source if you really need that.
</para>
<para>
Alternatively you can use a single channel FTDI FT245BM USB &lt;-&gt; parallel
FIFO chip and use the display in its 4 bit mode.
</para>
<table id="hd44780-ftdi.4bit-mapping">
<title>HD44780: 4bit FTDI</title>
<tgroup cols="5" align="left">
<colspec colname="ftdi1"/>
<colspec colname="ftdi2" align="right"/>
<colspec colname="base" align="center"/>
<colspec colname="lcd1"/>
<colspec colname="lcd2"/>
<thead>
<row>
<entry namest="ftdi1" nameend="ftdi2" align="center">FTDI chip</entry>
<entry morerows="1">&lt;-&gt;</entry>
<entry namest="lcd1" nameend="lcd2" align="center">LCD</entry>
</row>
<row>
<entry>name</entry>
<entry>pin</entry>
<entry>name</entry>
<entry>pin</entry>
</row>
</thead>
<tbody>
<row>
<entry>D0</entry>
<entry>25</entry>
<entry></entry>
<entry>D4</entry>
<entry>11</entry>
</row>
<row>
<entry>D1</entry>
<entry>24</entry>
<entry></entry>
<entry>D5</entry>
<entry>12</entry>
</row>
<row>
<entry>D2</entry>
<entry>23</entry>
<entry></entry>
<entry>D6</entry>
<entry>13</entry>
</row>
<row>
<entry>D3</entry>
<entry>22</entry>
<entry></entry>
<entry>D7</entry>
<entry>14</entry>
</row>
<row>
<entry>D4</entry>
<entry>21</entry>
<entry></entry>
<entry>EN</entry>
<entry>6</entry>
</row>
<row>
<entry>D5</entry>
<entry>20</entry>
<entry></entry>
<entry>RS</entry>
<entry>4</entry>
</row>
<row>
<entry>D6</entry>
<entry>19</entry>
<entry></entry>
<entry>RW</entry>
<entry>5</entry>
</row>
</tbody>
</tgroup>
</table>
<para>
The following special configuration settings are required to use a single
channel FTDI FIFO chip:
</para>
<example id="hd44780-ftdi-4bit-config.example">
<title>HD44780: Configuration for FTDI 4bit</title>
<screen>
<![CDATA[
[hd44780]
ConnectionType=ftdi
ftdi_mode=4
ftdi_line_RS=0x40
ftdi_line_RW=0x20
ftdi_line_EN=0x10
]]>
</screen>
</example>
</sect3>
<sect3 id="hd44780-lis2">
@@ -2706,7 +2819,8 @@ This can be done by specifying <option>--enable-drivers=all</option> or by inclu
<emphasis><parameter><literal>hd44780_default</literal></parameter></emphasis> |
<parameter><literal>hd44780_euro</literal></parameter> |
<parameter><literal>ea_ks0073</literal></parameter> |
<parameter><literal>sed12780f_0b</literal></parameter>
<parameter><literal>sed12780f_0b</literal></parameter> |
<parameter><literal>none</literal></parameter>
}
</term>
<listitem><para>
@@ -2729,6 +2843,12 @@ This can be done by specifying <option>--enable-drivers=all</option> or by inclu
<listitem><para>
<literal>sed12780f_0b</literal> is for some SED 1278 displays.
</para></listitem>
<listitem><para>
The <literal>none</literal> charmap does not translate any characters.
It displays the characters the display controllers actually has
stored in its CGROM for that position instead. This setting is
intended for debugging purpose.
</para></listitem>
</itemizedlist>
You only need to set this parameter if you have a non-standard
HD44780 display.