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-rw-r--r--drv_HD44780.c101
-rw-r--r--lcd4linux.conf.sample2
-rw-r--r--timer.c9
3 files changed, 81 insertions, 31 deletions
diff --git a/drv_HD44780.c b/drv_HD44780.c
index fff9f5a..5af3162 100644
--- a/drv_HD44780.c
+++ b/drv_HD44780.c
@@ -1,4 +1,4 @@
-/* $Id: drv_HD44780.c,v 1.37 2004/09/18 15:58:57 reinelt Exp $
+/* $Id: drv_HD44780.c,v 1.38 2004/09/19 09:31:19 reinelt Exp $
*
* new style driver for HD44780-based displays
*
@@ -29,6 +29,9 @@
*
*
* $Log: drv_HD44780.c,v $
+ * Revision 1.38 2004/09/19 09:31:19 reinelt
+ * HD44780 busy flag checking improved: fall back to busy-waiting if too many errors occur
+ *
* Revision 1.37 2004/09/18 15:58:57 reinelt
* even more HD44780 cleanups, hardwiring for LCM-162
*
@@ -214,6 +217,7 @@
#include "cfg.h"
#include "udelay.h"
#include "qprintf.h"
+#include "timer.h"
#include "plugin.h"
#include "widget.h"
#include "widget_text.h"
@@ -266,7 +270,12 @@ static unsigned char SIGNAL_ENABLE2;
static unsigned char SIGNAL_GPO;
/* maximum time to wait for the busy-flag (in usec) */
-#define MAX_BUSYFLAG_WAIT 100000
+#define MAX_BUSYFLAG_WAIT 10000
+
+/* maximum busy flag errors before falling back to busy-waiting */
+#define MAX_BUSYFLAG_ERRORS 20
+
+/* flag for busy-waiting vs. busy flag checking */
static int UseBusy = 0;
@@ -308,7 +317,7 @@ static MODEL Models[] = {
/*** generic functions ***/
/****************************************/
-static int (*drv_HD_load) (const char *section);
+static int (*drv_HD_load) (const char *section);
static void (*drv_HD_command) (const unsigned char controller, const unsigned char cmd, const int delay);
static void (*drv_HD_data) (const unsigned char controller, const char *string, const int len, const int delay);
static void (*drv_HD_stop) (void);
@@ -319,27 +328,35 @@ static void (*drv_HD_stop) (void);
/*** parport dependant functions ***/
/****************************************/
-static void drv_HD_PP_busy(int controller)
+static void drv_HD_PP_busy(const int controller)
{
+ static unsigned int errors = 0;
+
unsigned char enable;
- unsigned int counter;
unsigned char data=0xFF;
- unsigned char busymask=0;
-
+ unsigned char busymask;
+ unsigned char ctrlmask;
+ unsigned int counter;
+
if (Bits==8) {
busymask = 0x80;
} else {
/* Since in 4-Bit mode DB0 on the parport is mapped to DB4 on the LCD
- (and consequently, DB3 on the partport is mapped to DB7 on the LCD)
- we need to listen for DB3 on the parport to go low
- */
- busymask = 0x8;
+ * (and consequently, DB3 on the partport is mapped to DB7 on the LCD)
+ * we need to listen for DB3 on the parport to go low
+ */
+ busymask = 0x08;
}
- enable=SIGNAL_ENABLE;
+ ctrlmask = 0x02;
+ while (ctrlmask > 0 ) {
+
+ if (controller & ctrlmask) {
- while (controller > 0) {
- if (controller&0x01 && enable!=0) {
+ enable = 0;
+ if (ctrlmask & 0x01) enable = SIGNAL_ENABLE;
+ else if (ctrlmask & 0x02) enable = SIGNAL_ENABLE2;
+
/* set data-lines to input*/
drv_generic_parport_direction(1);
@@ -364,7 +381,10 @@ static void drv_HD_PP_busy(int controller)
while (1) {
/* read the busy flag */
data = drv_generic_parport_read();
- if ((data&busymask)==0) break;
+ if ((data & busymask) == 0) {
+ errors = 0;
+ break;
+ }
/* make sure we don't wait forever
- but only check after 5 iterations
@@ -378,25 +398,28 @@ static void drv_HD_PP_busy(int controller)
if (counter == 5) {
/* determine the time when the timeout has expired */
gettimeofday (&end, NULL);
- end.tv_usec+=MAX_BUSYFLAG_WAIT;
- while (end.tv_usec>1000000) {
- end.tv_usec-=1000000;
+ end.tv_usec += MAX_BUSYFLAG_WAIT;
+ while (end.tv_usec > 1000000) {
+ end.tv_usec -= 1000000;
end.tv_sec++;
}
}
/* get the current time */
gettimeofday(&now, NULL);
- if (now.tv_sec==end.tv_sec?now.tv_usec>=end.tv_usec:now.tv_sec>=end.tv_sec) {
- error ("%s: timeout waiting for busy flag on controller %x (%x)", Name, controller, data);
+ if (now.tv_sec == end.tv_sec ? now.tv_usec >= end.tv_usec : now.tv_sec >= end.tv_sec) {
+ error ("%s: timeout waiting for busy flag on controller %x (%x)", Name, ctrlmask, data);
+ if (++errors >= MAX_BUSYFLAG_ERRORS) {
+ error ("%s: too many busy flag failures, turning off busy flag checking.", Name);
+ UseBusy = 0;
+ }
break;
-
}
}
}
/* RS=low, RW=low, EN=low */
- if (Bits==8) {
+ if (Bits == 8) {
/* Lower EN */
drv_generic_parport_control(enable,0);
@@ -414,8 +437,7 @@ static void drv_HD_PP_busy(int controller)
/* set data-lines to output*/
drv_generic_parport_direction(0);
}
- enable=SIGNAL_ENABLE2;
- controller=controller >> 1;
+ ctrlmask >>= 1;
}
}
@@ -820,15 +842,35 @@ static void drv_HD_setGPO (const int bits)
#endif
-static int drv_HD_LCM162_keypad (void)
+static void drv_HD_LCM162_timer (void __attribute__((unused)) *notused)
{
static unsigned char data = 0x00;
+
+ /* Bit 3+5 : key number */
+ /* Bit 6 : key press/release */
+ unsigned char mask3 = 1<<3;
+ unsigned char mask5 = 1<<5;
+ unsigned char mask6 = 1<<6;
+ unsigned char mask = mask3 | mask5 | mask6;
+
+ int keynum;
+ int updown;
- if (!(Capabilities & CAP_LCM162)) return -1;
+ unsigned char temp;
+ temp = drv_generic_parport_status() & mask;
+
+ if (data != temp) {
+ data = temp;
+
+ keynum = (data & mask3 ? 1 : 0) + (data & mask5 ? 2 : 0);
+ updown = (data & mask6 ? 1 : 0);
+
+ debug ("key %d press %d", keynum, updown);
+ }
}
-
+
static int drv_HD_start (const char *section, const int quiet)
{
char *model, *size, *bus;
@@ -951,6 +993,11 @@ static int drv_HD_start (const char *section, const int quiet)
}
}
+ /* install keypad polling timer for LCM-162 */
+ if (Capabilities & CAP_LCM162) {
+ timer_add (drv_HD_LCM162_timer, NULL, 10, 0);
+ }
+
if (!quiet) {
char buffer[40];
qprintf(buffer, sizeof(buffer), "%s %dx%d", Name, DCOLS, DROWS);
diff --git a/lcd4linux.conf.sample b/lcd4linux.conf.sample
index c4fb5d1..644a780 100644
--- a/lcd4linux.conf.sample
+++ b/lcd4linux.conf.sample
@@ -96,7 +96,7 @@ Display SC1602D {
Display LCM-162 {
Driver 'HD44780'
Model 'LCM-162'
- Bus 'parport'
+# Bus 'parport'
Port '/dev/parports/0'
Size '16x2'
UseBusy 1
diff --git a/timer.c b/timer.c
index 54c9351..6b65574 100644
--- a/timer.c
+++ b/timer.c
@@ -1,4 +1,4 @@
-/* $Id: timer.c,v 1.10 2004/06/26 12:05:00 reinelt Exp $
+/* $Id: timer.c,v 1.11 2004/09/19 09:31:19 reinelt Exp $
*
* generic timer handling
*
@@ -21,6 +21,9 @@
*
*
* $Log: timer.c,v $
+ * Revision 1.11 2004/09/19 09:31:19 reinelt
+ * HD44780 busy flag checking improved: fall back to busy-waiting if too many errors occur
+ *
* Revision 1.10 2004/06/26 12:05:00 reinelt
*
* uh-oh... the last CVS log message messed up things a lot...
@@ -130,8 +133,6 @@ int timer_add (void (*callback)(void *data), void *data, const int interval, con
int i;
struct timeval now;
- gettimeofday(&now, NULL);
-
/* find a free slot */
for (i=0; i<nTimers; i++) {
if (Timers[i].active==0) break;
@@ -143,6 +144,8 @@ int timer_add (void (*callback)(void *data), void *data, const int interval, con
Timers=realloc(Timers, nTimers*sizeof(*Timers));
}
+ gettimeofday(&now, NULL);
+
/* fill slot */
Timers[i].callback = callback;
Timers[i].data = data;