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HD44780 update:

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- supports new API
- major clean up, more consistent code
- uses configfile options
- serialLpt works also with only 2 output lines
- serialLpt can now use keypad
This commit is contained in:
robijn
2001-11-01 00:37:12 +00:00
parent 0619f03774
commit faa4861eb3
9 changed files with 786 additions and 494 deletions
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server/drivers/hd44780-ext8bit.c
+46 -24
View File
@@ -16,11 +16,13 @@
* D5 (7) D5 (12)
* D6 (8) D6 (13)
* D7 (9) D7 (14)
* nSEL (17) -
* nSTRB (1) RS (4)
* nLF (14) RW (5) (LCD2 - 6) (optional - pull all LCD RW low)
* INIT (16) EN (6)
*
* Backlight
* SEL (17) backlight (optional, see documentation)
*
* Keypad connection (optional):
* Some diodes and resistors are needed, see further documentation.
* printer port keypad
@@ -65,20 +67,17 @@
// HD44780_readkeypad
void lcdtime_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned char ch);
void lcdtime_HD44780_backlight (unsigned char state);
unsigned char lcdtime_HD44780_readkeypad (unsigned int YData);
#define nRS nSTRB
#define nRW nLF
#define EN1 INIT
#define METER_OFF nSEL
#define RS STRB
#define RW LF
#define EN1 INIT
#define BL SEL
#define SETUPLCD (METER_OFF | nRS)
#define CTRL (nRW | METER_OFF | nRS)
#define CHAR (nRW | METER_OFF)
static int extIF = 0; // non-zero if extended interface
static unsigned int lptPort;
static char stuckinputs = 0; // if an input line is stuck, it will be ignored
static char stuckinputs = 0; // if an input line is stuck, it will be ignored
static char backlight_bit = 0;
static int semid;
@@ -95,6 +94,7 @@ hd_init_ext8bit (HD44780_functions * hd44780_functions, lcd_logical_driver * dri
port_access(lptPort+2);
hd44780_functions->senddata = lcdtime_HD44780_senddata;
hd44780_functions->backlight = lcdtime_HD44780_backlight;
hd44780_functions->readkeypad = lcdtime_HD44780_readkeypad;
// setup the lcd in 8 bit mode
@@ -106,6 +106,11 @@ hd_init_ext8bit (HD44780_functions * hd44780_functions, lcd_logical_driver * dri
hd44780_functions->uPause (40);
common_init ();
if (have_keypad) {
// Remember which input lines are stuck
stuckinputs = lcdtime_HD44780_readkeypad (0);
}
return 0;
}
@@ -113,31 +118,42 @@ hd_init_ext8bit (HD44780_functions * hd44780_functions, lcd_logical_driver * dri
void
lcdtime_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned char ch)
{
unsigned char dispID = 0, portControl;
unsigned char enableLines = 0, portControl;
if (displayID == 1)
dispID |= EN1;
else //if (displayID == 0)
dispID |= EN1;
// Only one controller is supported
enableLines = EN1;
if (flags == RS_DATA)
portControl = CHAR;
else
portControl = CTRL;
if (flags == RS_INSTR)
portControl = 0;
else //if (iflags == RS_DATA)
portControl = RS;
portControl |= backlight_bit;
sem_wait (semid);
port_out (lptPort + 2, SETUPLCD);
port_out (lptPort + 2, portControl ^ OUTMASK);
port_out (lptPort, ch);
port_out (lptPort + 2, dispID | portControl);
port_out (lptPort + 2, (enableLines|portControl) ^ OUTMASK);
hd44780_functions->uPause (1);
port_out (lptPort + 2, portControl);
port_out (lptPort + 2, portControl ^ OUTMASK);
sem_signal (semid);
}
void lcdtime_HD44780_backlight (unsigned char state)
{
backlight_bit = (state?0:SEL);
// Semaphores not needed because backlight will not go together with
// the bacrgraph anyway...
port_out (lptPort + 2, backlight_bit ^ OUTMASK);
}
unsigned char lcdtime_HD44780_readkeypad (unsigned int YData)
{
unsigned char readval;
sem_wait (semid);
// 10 bits output
// Convert the positive logic to the negative logic on the LPT port
port_out (lptPort, ~YData & 0x00FF );
@@ -145,7 +161,13 @@ unsigned char lcdtime_HD44780_readkeypad (unsigned int YData)
port_out (lptPort + 2, ( ((~YData & 0x0100) >> 8) | ((~YData & 0x0200) >> 6)) ^ OUTMASK);
}
// And convert it back.
// Read inputs
readval = ~ port_in (lptPort + 1) ^ INMASK;
// Put port back into idle state for backlight
port_out (lptPort, backlight_bit ^ OUTMASK);
sem_signal (semid);
// And convert value back.
return ( (readval >> 4 & 0x03) | (readval >> 5 & 0x04) | (readval >> 3 & 0x08) | (readval << 1 & 0x10) ) & ~stuckinputs;
}