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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-winamp.c
+37 -28
View File
@@ -29,6 +29,9 @@
* INIT (16) RS (4)
* nSEL (17) EN2 (6 - LCD 2) (optional)
*
* Backlight
* SEL (17) backlight (optional, see documentation)
*
* Keypad connection (optional):
* Some diodes and resistors are needed, see further documentation.
* printer port keypad
@@ -64,32 +67,33 @@
#include <string.h>
#include <errno.h>
#include "port.h"
// Generally, any function that accesses the LCD control lines needs to be
// implemented separately for each HW design. This is typically (but not
// restricted to):
// HD44780_senddata
// HD44780_readkeypad
void lcdwinamp_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned char ch);
void lcdwinamp_HD44780_backlight (unsigned char state);
unsigned char lcdwinamp_HD44780_readkeypad (unsigned int YData);
#define EN1 STRB
#define EN2 SEL
#define EN3 LF
#define RS INIT
#define EN1 STRB
#define EN2 SEL
#define EN3 LF
#define RW LF
#define RS INIT
#define BL SEL
static unsigned char EnMask[] = { EN1, EN2, EN3 };
static int EnMaskSize = sizeof (EnMask) / sizeof (unsigned char);
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; // default to low to enable two displays
// initialise the driver
int
hd_init_winamp (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;
// Reserve the port registers
lptPort = port;
port_access(lptPort);
@@ -97,16 +101,9 @@ hd_init_winamp (HD44780_functions * hd44780_functions, lcd_logical_driver * driv
port_access(lptPort+2);
hd44780_functions->senddata = lcdwinamp_HD44780_senddata;
hd44780_functions->backlight = lcdwinamp_HD44780_backlight;
hd44780_functions->readkeypad = lcdwinamp_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;
}
// setup the lcd in 8 bit mode
hd44780_functions->senddata (0, RS_INSTR, FUNCSET | IF_8BIT);
hd44780_functions->uPause (4100);
@@ -123,7 +120,7 @@ hd_init_winamp (HD44780_functions * hd44780_functions, lcd_logical_driver * driv
void
lcdwinamp_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned char ch)
{
unsigned char dispID = 0, portControl;
unsigned char enableLines = 0, portControl;
if (flags == RS_DATA)
portControl = RS;
@@ -131,29 +128,36 @@ lcdwinamp_HD44780_senddata (unsigned char displayID, unsigned char flags, unsign
portControl = 0;
if (displayID == 0)
dispID = EnMask[0] | EnMask[1] | ((extIF) ? EnMask[2] : 0);
enableLines = EnMask[0] | EnMask[1] | ((extIF) ? EnMask[2] : 0);
else
dispID = EnMask[displayID - 1];
enableLines = EnMask[displayID - 1];
// 40 nS setup time for RS valid to EN high, so set RS
port_out (lptPort + 2, portControl ^ OUTMASK);
port_out (lptPort + 2, (portControl|backlight_bit) ^ OUTMASK);
// Output the actual data
port_out (lptPort, ch);
// then set EN high
port_out (lptPort + 2, (dispID | portControl) ^ OUTMASK);
port_out (lptPort + 2, (enableLines|portControl|backlight_bit) ^ OUTMASK);
// 80 nS setup from valid data to EN low will be met without any delay
// unless you are running a REALLY FAST ISA bus (like 75 MHZ!)
// 230 nS minimum E high time provided by ISA bus delays as well...
// Set EN low and we're done...
port_out (lptPort + 2, portControl ^ OUTMASK);
port_out (lptPort + 2, (portControl|backlight_bit) ^ OUTMASK);
// 10 nS data hold time provided by the length of ISA write for EN
}
void lcdwinamp_HD44780_backlight (unsigned char state)
{
backlight_bit = (state?0:nSEL);
port_out (lptPort + 2, backlight_bit ^ OUTMASK);
}
unsigned char lcdwinamp_HD44780_readkeypad (unsigned int YData)
{
unsigned char readval;
@@ -163,7 +167,12 @@ unsigned char lcdwinamp_HD44780_readkeypad (unsigned int YData)
port_out (lptPort, ~YData & 0x00FF );
port_out (lptPort + 2, ( ((~YData & 0x0100) >> 7) | ((~YData & 0x0200) >> 7 )) ^ OUTMASK);
// And convert it back.
// Read inputs
readval = ~ port_in (lptPort + 1) ^ INMASK;
// Set output back to idle state for backlight
port_out (lptPort + 2, backlight_bit ^ INMASK );
// And convert value back.
return ( (readval >> 4 & 0x03) | (readval >> 5 & 0x04) | (readval >> 3 & 0x08) | (readval << 1 & 0x10) ) & ~stuckinputs;
}