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HD44780 update:

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- howto updated
- input pin readout reversed
- 4bit and serialLpt init timing modified
This commit is contained in:
robijn
2002-02-22 01:13:24 +00:00
parent fc92898174
commit b3e1506ffa
6 changed files with 73 additions and 31 deletions
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server/drivers/hd44780-serialLpt.c
+20 -3
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@@ -97,7 +97,10 @@ hd_init_serialLpt (Driver *drvthis)
hd44780_functions->uPause (p, 5000);
shiftreg (p, enableLines, 3);
hd44780_functions->uPause (p, 150);
hd44780_functions->uPause (p, 100);
shiftreg (p, enableLines, 3);
hd44780_functions->uPause (p, 100);
shiftreg (p, enableLines, 2);
hd44780_functions->uPause (p, 100);
@@ -168,7 +171,14 @@ unsigned char lcdserLpt_HD44780_scankeypad (PrivateData *p)
p->hd44780_functions->uPause (p, 1);
readval = ~ port_in (p->port + 1) ^ INMASK;
inputs_zero = ( (readval >> 4 & 0x03) | (readval >> 5 & 0x04) | (readval >> 3 & 0x08) | (readval << 1 & 0x10) );
// 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 */
if( inputs_zero == 0 ) {
// No keys were pressed
@@ -192,7 +202,14 @@ unsigned char lcdserLpt_HD44780_scankeypad (PrivateData *p)
if( !scancode ) {
// Read input line(s)
readval = ~ port_in (p->port + 1) ^ INMASK;
keybits = ( (readval >> 4 & 0x03) | (readval >> 5 & 0x04) | (readval >> 3 & 0x08) | (readval << 1 & 0x10) );
// And convert value back (MSB first).
keybits = (((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( keybits != inputs_zero ) {
shiftingbit = 1;
for (shiftcount=0; shiftcount<KEYPAD_MAXX && !scancode; shiftcount++) {