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HD44780 update: reporting fixed, serialLpt behaviour improved.

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This commit is contained in:
robijn
2002-05-26 19:22:50 +00:00
parent 3168d4cafc
commit 7e478dc7da
2 changed files with 43 additions and 26 deletions
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server/drivers/hd44780-serialLpt.c
+36 -17
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@@ -161,10 +161,18 @@ unsigned char lcdserLpt_HD44780_scankeypad (PrivateData *p)
unsigned int scancode = 0;
// While scanning the keypad, the 2-wire version will place the
// character 0xFF on the current cursor position. Therefor we fisrt
// set the cursor position to -1, so it's harmless.
// character 0xFF on the current cursor position. Therefor we first
// set the cursor position to home, do the keypad reading and
// afterwards restore the first character (on all connected displays).
//
// I could not prevent this, while staying compatible with both
// wiring versions.
// wiring versions. Joris.
//
// (Positioning the cursor out of screen does not work either :( )
// Set cursor position
p->hd44780_functions->senddata (p, 0, RS_INSTR, POSITION | 0 );
p->hd44780_functions->uPause (p, 40);
// Clear the shiftregister, needed for 3-wire version
rawshift(p, 0);
@@ -173,11 +181,11 @@ unsigned char lcdserLpt_HD44780_scankeypad (PrivateData *p)
readval = ~ port_in (p->port + 1) ^ INMASK;
// And convert value back (MSB first).
inputs_zero = (((readval & FAULT) / FAULT <<4) | /* pin 15 */
((readval & SELIN) / SELIN <<3) | /* pin 13 */
((readval & PAPEREND) / PAPEREND <<2) | /* pin 12 */
((readval & BUSY) / BUSY <<1) | /* pin 11 */
((readval & ACK) / ACK )); /* pin 10 */
inputs_zero = (((readval & FAULT) / FAULT <<4) | /* pin 15 */
((readval & SELIN) / SELIN <<3) | /* pin 13 */
((readval & PAPEREND) / PAPEREND <<2) | /* pin 12 */
((readval & BUSY) / BUSY <<1) | /* pin 11 */
((readval & ACK) / ACK )); /* pin 10 */
if( inputs_zero == 0 ) {
@@ -188,16 +196,12 @@ unsigned char lcdserLpt_HD44780_scankeypad (PrivateData *p)
return 0;
}
// Set cursor position to -1
p->hd44780_functions->senddata (p, 0, RS_INSTR, POSITION | 127);
p->hd44780_functions->uPause (p, 40);
// Scan the keypad while sending the first half of the command (high nibble)
for (i = 7; i >= 0; i--) { /* MSB first */
port_out (p->port, LCDDATA); /*set up data */
port_out (p->port, LCDDATA | LCDCLOCK); /*rising edge of clock */
p->hd44780_functions->uPause (p, 2);
p->hd44780_functions->uPause (p, 1);
if( !scancode ) {
// Read input line(s)
@@ -230,11 +234,26 @@ unsigned char lcdserLpt_HD44780_scankeypad (PrivateData *p)
// Needed for 2-wire version.
rawshift (p, 0xFF);
// Wait for 2-wire version to clear the latch...
p->hd44780_functions->uPause (p, 6);
// Wait 6us for 2-wire version to clear the latch and wait for
// the data to be processed
p->hd44780_functions->uPause (p, 40);
// Restore line status for backlight.
port_out (p->port, p->backlight_bit );
// Restore the screen state
// Move back to home cursor position
p->hd44780_functions->senddata (p, 0, RS_INSTR, POSITION | 0 );
p->hd44780_functions->uPause (p, 40);
// Output the corect byte
p->hd44780_functions->senddata (p, 1, RS_DATA,
p->framebuf[0] );
// ... and second display if connected ...
if (p->numDisplays>1) {
p->hd44780_functions->senddata (p, 2, RS_DATA,
p->framebuf[ p->width * p->dispVOffset[2-1] ] );
}
p->hd44780_functions->uPause (p, 40);
// No need to restore the line for backlight, already done by senddata.
return scancode;
}