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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/hd44780-4bit.c
+62 -49
View File
@@ -20,7 +20,11 @@
* D6 (8) EN (6)
* D7 (9) EN2 (LCD2 - 6) (optional)
*
* Backlight
* D5 (7) backlight (optional, see documentation)
*
* Extended interface (including LCD3 above)
* D5 (7) EN3
* STR (1) EN4
* LF (14) EN5
* INIT (16) EN6
@@ -66,34 +70,37 @@
#include <errno.h>
// Generally, any function that accesses the LCD control lines needs to be
// implemented separately for each HW design. This is typically just
// HD44780_senddata and HD44780_readkeypad
// implemented separately for each HW design. This is typically (but not
// restricted to):
// HD44780_senddata
// HD44780_readkeypad
void lcdstat_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned char ch);
void lcdstat_HD44780_backlight (unsigned char state);
unsigned char lcdstat_HD44780_readkeypad (unsigned int YData);
#define RS 0x10
#define RW 0x20
#define EN1 0x40
#define EN2 0x80
#define EN3 0x20
#define RS 0x10
#define RW 0x20
#define EN1 0x40
#define EN2 0x80
#define EN3 0x20
#define BL 0x20
// note that the above bits are all meant for the data port of LPT
static unsigned char EnMask[] = { EN1, EN2, EN3, STRB, LF, INIT, SEL };
static int EnMaskSize = sizeof (EnMask) / sizeof (unsigned char);
static int extIF = 0; // non-zero if extended interface
#define ALLEXT (STRB|LF|INIT|SEL)
// The above bits are on the control port of LPT
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; // default to low to enable three displays
// initialisation function
int
hd_init_4bit (HD44780_functions * hd44780_functions, lcd_logical_driver * driver, char *args, unsigned int port)
{
// TODO: remove magic numbers below
char *argv[64];
int argc;
int i;
int displayID = EN1 | EN2;
int enableLines = EN1 | EN2;
// Reserve the port registers
lptPort = port;
@@ -102,44 +109,36 @@ hd_init_4bit (HD44780_functions * hd44780_functions, lcd_logical_driver * driver
port_access(lptPort+2);
hd44780_functions->senddata = lcdstat_HD44780_senddata;
hd44780_functions->backlight = lcdstat_HD44780_backlight;
hd44780_functions->readkeypad = lcdstat_HD44780_readkeypad;
// parse command-line arguments
argc = get_args (argv, args, 64);
for (i = 0; i < argc; ++i) {
if (strcmp (argv[i], "-e") == 0 || strcmp (argv[i], "--extended") == 0) {
extIF = 1;
}
}
// powerup the lcd now
if (extIF) {
displayID |= EN3;
enableLines |= EN3;
port_out (lptPort + 2, 0 ^ OUTMASK);
}
port_out (lptPort, displayID | 0x03);
port_out (lptPort, enableLines | 0x03);
if (extIF)
port_out (lptPort + 2, (EnMask[3] | EnMask[4] | EnMask[5] | EnMask[6]) ^ OUTMASK);
port_out (lptPort + 2, ALLEXT ^ OUTMASK);
hd44780_functions->uPause (1);
port_out (lptPort, 0x03);
if (extIF)
port_out (lptPort + 2, 0 ^ OUTMASK);
hd44780_functions->uPause (4100);
port_out (lptPort, displayID | 0x03);
port_out (lptPort, enableLines | 0x03);
if (extIF)
port_out (lptPort + 2, (EnMask[3] | EnMask[4] | EnMask[5] | EnMask[6]) ^ OUTMASK);
port_out (lptPort + 2, ALLEXT ^ OUTMASK);
hd44780_functions->uPause (1);
port_out (lptPort, 0x03);
if (extIF)
port_out (lptPort + 2, 0 ^ OUTMASK);
hd44780_functions->uPause (100);
port_out (lptPort, displayID | 0x03);
port_out (lptPort, enableLines | 0x03);
if (extIF)
port_out (lptPort + 2, (EnMask[3] | EnMask[4] | EnMask[5] | EnMask[6]) ^ OUTMASK);
port_out (lptPort + 2, ALLEXT ^ OUTMASK);
hd44780_functions->uPause (1);
port_out (lptPort, 0x03);
if (extIF)
@@ -147,9 +146,9 @@ hd_init_4bit (HD44780_functions * hd44780_functions, lcd_logical_driver * driver
hd44780_functions->uPause (40);
// now in 8-bit mode... set 4-bit mode
port_out (lptPort, displayID | 0x02);
port_out (lptPort, enableLines | 0x02);
if (extIF)
port_out (lptPort + 2, (EnMask[3] | EnMask[4] | EnMask[5] | EnMask[6]) ^ OUTMASK);
port_out (lptPort + 2, ALLEXT ^ OUTMASK);
hd44780_functions->uPause (1);
port_out (lptPort, 0x02);
if (extIF)
@@ -168,16 +167,18 @@ hd_init_4bit (HD44780_functions * hd44780_functions, lcd_logical_driver * driver
// lcdstat_HD44780_senddata
void
lcdstat_HD44780_senddata (unsigned char displayID, unsigned char iflags, unsigned char ch)
lcdstat_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned char ch)
{
unsigned char enableLines = 0, flags = 0;
unsigned char enableLines = 0, portControl = 0;
unsigned char h = (ch >> 4) & 0x0f; // high and low nibbles
unsigned char l = ch & 0x0f;
if (iflags == RS_INSTR)
flags = 0;
else //if (iflags == RS_DATA)
flags = RS;
if (flags == RS_INSTR)
portControl = 0;
else //if (flags == RS_DATA)
portControl = RS;
portControl |= backlight_bit;
if (displayID <= 3) {
if (displayID == 0)
@@ -185,36 +186,43 @@ lcdstat_HD44780_senddata (unsigned char displayID, unsigned char iflags, unsigne
else
enableLines = EnMask[displayID - 1];
port_out (lptPort, flags | h);
port_out (lptPort, portControl | h);
hd44780_functions->uPause (2);
port_out (lptPort, enableLines | flags | h);
port_out (lptPort, enableLines | portControl | h);
hd44780_functions->uPause (4);
port_out (lptPort, flags | h);
port_out (lptPort, portControl | h);
port_out (lptPort, enableLines | flags | l);
port_out (lptPort, enableLines | portControl | l);
hd44780_functions->uPause (4);
port_out (lptPort, flags | l);
port_out (lptPort, portControl | l);
}
if (extIF && (displayID == 0 || displayID >= 4)) {
if (displayID == 0)
enableLines = EnMask[3] | EnMask[4] | EnMask[5] | EnMask[6];
enableLines = ALLEXT;
else
enableLines = EnMask[(displayID - 1) % EnMaskSize];
enableLines = EnMask[(displayID - 1)];
port_out (lptPort, flags | h);
port_out (lptPort, portControl | h);
hd44780_functions->uPause (2);
port_out (lptPort + 2, enableLines ^ OUTMASK);
hd44780_functions->uPause (4);
port_out (lptPort + 2, 0 ^ OUTMASK);
port_out (lptPort, flags | l);
port_out (lptPort, portControl | l);
port_out (lptPort + 2, enableLines ^ OUTMASK);
hd44780_functions->uPause (4);
port_out (lptPort + 2, 0 ^ OUTMASK);
}
}
void lcdstat_HD44780_backlight (unsigned char state)
{
backlight_bit = (state?0:0x20); // D5 line
port_out (lptPort, backlight_bit);
}
unsigned char lcdstat_HD44780_readkeypad (unsigned int YData)
{
unsigned char readval;
@@ -226,7 +234,12 @@ unsigned char lcdstat_HD44780_readkeypad (unsigned int YData)
port_out (lptPort + 2, ( ((~YData & 0x03C0) << 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);
// And convert value back.
return ( (readval >> 4 & 0x03) | (readval >> 5 & 0x04) | (readval >> 3 & 0x08) | (readval << 1 & 0x10) ) & ~stuckinputs;
}