mangavalk/lcdproc
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

HD44780 update:

Browse Source 
- 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
Download Patch File Download Diff File Expand all files Collapse all files
server/drivers/hd44780-serialLpt.c
+62 -59
View File
@@ -36,6 +36,7 @@
* Q4 (7) Y3
* Q5 (14) Y4
* Q6 (13) Y5
* Q7 (12) Y6
* The 'output' of the keys should be connected to the following LPT pins:
* nACK (10) X0
* BUSY (11) X1
@@ -59,9 +60,9 @@
// Hardware specific functions
void lcdserLpt_HD44780_senddata (unsigned char displayID, unsigned char flags, unsigned char ch);
unsigned char lcdserLpt_HD44780_readkeypad (unsigned int YData);
void lcdserLpt_HD44780_backlight (unsigned char state);
static char lcdserLpt_HD44780_getkey (void); // old keypad code
unsigned char lcdserLpt_HD44780_scankeypad ();
void rawshift (unsigned char r);
void shiftreg (unsigned char displayID, unsigned char r);
@@ -72,9 +73,6 @@ void shiftreg (unsigned char displayID, unsigned char r);
#define EN2 32
static unsigned int lptPort;
static char stuckinputs = 0; // if an input line is stuck, it will be ignored
static char lastkey = 0; // currently not in use, old keypad code
// Initialisation
int
@@ -89,11 +87,9 @@ hd_init_serialLpt (HD44780_functions * hd44780_functions, lcd_logical_driver * d
port_access(lptPort+2);
hd44780_functions->senddata = lcdserLpt_HD44780_senddata;
hd44780_functions->readkeypad = lcdserLpt_HD44780_readkeypad;
hd44780_functions->backlight = lcdserLpt_HD44780_backlight;
hd44780_functions->scankeypad = lcdserLpt_HD44780_scankeypad;
if (have_keypad) {
driver->getkey = lcdserLpt_HD44780_getkey;
}
// Clear the shiftregister
rawshift (0);
@@ -114,17 +110,6 @@ hd_init_serialLpt (HD44780_functions * hd44780_functions, lcd_logical_driver * d
common_init ();
/*
// set display type functions
lcdserLpt_HD44780_senddata (0, RS_INSTR, FUNCSET | IF_4BIT | TWOLINE | SMALLCHAR);
// clear
lcdserLpt_HD44780_senddata (0, RS_INSTR, CLEAR);
hd44780_functions->uPause (1600);
// Now turn on the display
lcdserLpt_HD44780_senddata (displayID, RS_INSTR, ONOFFCTRL | DISPON | CURSOROFF | CURSORNOBLINK);
hd44780_functions->uPause (1600);
*/
return 0;
}
@@ -149,47 +134,67 @@ lcdserLpt_HD44780_senddata (unsigned char displayID, unsigned char flags, unsign
shiftreg (enableLines, portControl | h);
shiftreg (enableLines, portControl | l);
/* TODO: instead of delay read keys here */
}
char
lcdserLpt_HD44780_getkey ()
void
lcdserLpt_HD44780_backlight (unsigned char state)
{
// TODO: a keypad scan that does not use shift register
// define a key table
char keytr[] = "ABCDEFGH";
int n;
}
// disabled now !
return 0;
unsigned char lcdserLpt_HD44780_scankeypad ()
{
// Unfortunately just bit shifting does not work with the 2 IC version...
rawshift (0); //send all line on shift register low
hd44780_functions->uPause (1);
if ((port_in (lptPort + 1) & 32) == 0) //test if line back is low - if not return(0)
{ //else
//start walking a single zero across the eight lines
for (n = 7; n >= 0; n--) {
rawshift (255 - (1 << n));
hd44780_functions->uPause (1);
unsigned char keybits;
unsigned int shiftcount;
unsigned int shiftingbit;
unsigned char readval, inputs_zero, r;
int i;
unsigned int scancode = 0;
if ((port_in (lptPort + 1) & 32) == 0) // check if line back is low if yes debounce
{
if (lastkey == keytr[n])
return (0);
// printf("key is %c %d\n",keytr[n],n);
lastkey = keytr[n];
return (keytr[n]); //return correct key code.
r = 0xFF; // This command will set the cursor position, so it's harmless
readval = ~ port_in (lptPort + 1) ^ INMASK;
inputs_zero = ( (readval >> 4 & 0x03) | (readval >> 5 & 0x04) | (readval >> 3 & 0x08) | (readval << 1 & 0x10) );
if( inputs_zero == 0 ) {
return 0;
}
// Scan the keypad while sending the first half of the command (high nibble)
for (i = 7; i >= 0; i--) { /* MSB first */
port_out (lptPort, ((r >> i) & 1) * LCDDATA); /*set up data */
port_out (lptPort, (((r >> i) & 1) * LCDDATA) | LCDCLOCK); /*rising edge of clock */
hd44780_functions->uPause (2);
// Do keyscan too !
if( !scancode ) {
// Read input line(s)
readval = ~ port_in (lptPort + 1) ^ INMASK;
keybits = ( (readval >> 4 & 0x03) | (readval >> 5 & 0x04) | (readval >> 3 & 0x08) | (readval << 1 & 0x10) );
if( keybits != inputs_zero ) {
shiftingbit = 1;
for (shiftcount=0; shiftcount<KEYPAD_MAXX && !scancode; shiftcount++) {
if ( (keybits ^ inputs_zero ) & shiftingbit) {
// Found !
scancode = ((8-i)<<4) | (shiftcount+1);
}
shiftingbit <<= 1;
}
}
}
} //else fall out and return(0) [too transient a keypress]
lastkey = 0;
return (0);
}
}
unsigned char lcdserLpt_HD44780_readkeypad (unsigned int YData)
{
return 0;
hd44780_functions->uPause (4);
// And again for the second half of the command (low nibble)
rawshift (r);
hd44780_functions->uPause (4);
return scancode;
}
/* this function sends r out onto the shift register */
@@ -197,6 +202,8 @@ void
rawshift (unsigned char r)
{
int i;
// r |= 0x80; // just to make sure ...
for (i = 7; i >= 0; i--) { /* MSB first */
port_out (lptPort, ((r >> i) & 1) * LCDDATA); /*set up data */
port_out (lptPort, (((r >> i) & 1) * LCDDATA) | LCDCLOCK); /*rising edge of clock */
@@ -207,13 +214,9 @@ rawshift (unsigned char r)
void
shiftreg (unsigned char enableLines, unsigned char r)
{
//unsigned char mr;
//mr = (r & 0xF0) | ((r<<3) & 0x0F) | ((r<<1) & 0x04) |
// ((r>>1) & 0x02) | ((r>>3) & 0x01);
rawshift (r | 0x80); // highest bit always set to 1 for Clear
port_out (lptPort, enableLines); //latch it, to correct display
rawshift (r | 0x80); // highest bit always set to 1 for Clear for wiring with 2 ICs
port_out (lptPort, enableLines); // latch it, to correct display
hd44780_functions->uPause (1);
port_out (lptPort, 0);
port_out (lptPort, 0); // for wiring with 1 IC
hd44780_functions->uPause (3);
}