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Correct settings example for hd44780/ftdi in 4bit mode (by L. Colangiuli)

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This commit is contained in:
mmdolze
2011-10-06 20:29:29 +00:00
parent 377aa5d9f8
commit 72dff35234
2 changed files with 10 additions and 7 deletions
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docs/lcdproc-user/drivers/hd44780.docbook
+2 -2
View File
@@ -1964,9 +1964,9 @@ channel FTDI FIFO chip:
[hd44780] [hd44780]
ConnectionType=ftdi ConnectionType=ftdi
ftdi_mode=4 ftdi_mode=4
ftdi_line_RS=0x40
ftdi_line_RW=0x20
ftdi_line_EN=0x10 ftdi_line_EN=0x10
ftdi_line_RS=0x20
ftdi_line_RW=0x40
]]> ]]>
</screen> </screen>
</example> </example>
server/drivers/hd44780-ftdi.c
+8 -5
View File
@@ -2,16 +2,18 @@
* \c ftdi connection type of \c hd44780 driver for Hitachi HD44780 based LCD displays. * \c ftdi connection type of \c hd44780 driver for Hitachi HD44780 based LCD displays.
* *
\verbatim \verbatim
info for 4bit mode (ftdi_mode == 4): Info for 4bit mode (ftdi_mode == 4):
wiring example: wiring example:
FTDI chip: D0 D1 D2 D3 D4 D5 D6 D7 FTDI chip: D0 D1 D2 D3 D4 D5 D6 D7
| | | | | | | | | | | | | | | |
HD44780: D4 D5 D6 D7 EN RS RW n/c HD44780: D4 D5 D6 D7 EN RS RW n/c
in LCDd.conf we then need to define in LCDd.conf we then need to define
ftdi_line_RS=0x40
ftdi_line_RW=0x20
ftdi_line_EN=0x10 ftdi_line_EN=0x10
ftdi_line_RS=0x20
ftdi_line_RW=0x40
RW of your display can either be connected to D6 or GND.
\endverbatim \endverbatim
*/ */
@@ -81,6 +83,7 @@ hd_init_ftdi(Driver *drvthis)
p->ftdi_line_RW = drvthis->config_get_int(drvthis->name, "ftdi_line_RW", 0, 0x02); p->ftdi_line_RW = drvthis->config_get_int(drvthis->name, "ftdi_line_RW", 0, 0x02);
p->ftdi_line_EN = drvthis->config_get_int(drvthis->name, "ftdi_line_EN", 0, 0x04); p->ftdi_line_EN = drvthis->config_get_int(drvthis->name, "ftdi_line_EN", 0, 0x04);
p->ftdi_line_backlight = drvthis->config_get_int(drvthis->name, "ftdi_line_backlight", 0, 0x08); p->ftdi_line_backlight = drvthis->config_get_int(drvthis->name, "ftdi_line_backlight", 0, 0x08);
p->backlight_bit = 0;
/* some foolproof check */ /* some foolproof check */
if (p->ftdi_mode != 4 && p->ftdi_mode != 8) { if (p->ftdi_mode != 4 && p->ftdi_mode != 8) {
@@ -166,7 +169,7 @@ ftdi_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char fla
exit(-1); exit(-1);
} }
/* Setup RS and R/W and EN */ /* Setup RS and R/W and EN on second channel */
ch = p->ftdi_line_EN | p->backlight_bit; ch = p->ftdi_line_EN | p->backlight_bit;
if (flags == RS_DATA) { if (flags == RS_DATA) {
ch |= p->ftdi_line_RS; ch |= p->ftdi_line_RS;
@@ -178,7 +181,7 @@ ftdi_HD44780_senddata(PrivateData *p, unsigned char displayID, unsigned char fla
exit(-1); exit(-1);
} }
/* Disable E */ /* Disable EN */
ch = 0x00 | p->backlight_bit; ch = 0x00 | p->backlight_bit;
if (flags == RS_DATA) { if (flags == RS_DATA) {
ch |= p->ftdi_line_RS; ch |= p->ftdi_line_RS;