aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorreinelt <>2002-08-18 08:11:11 +0000
committerreinelt <>2002-08-18 08:11:11 +0000
commitd9d3e35a7b8ebe1f2aab0b8c010b5030f1c3e9df (patch)
tree784789e298b17e8262daaaebd0fb59ba049211ba
parentc83e3395fdfe759255c037109604463ef034bb15 (diff)
downloadlcd4linux-d9d3e35a7b8ebe1f2aab0b8c010b5030f1c3e9df.tar.gz
[lcd4linux @ 2002-08-18 08:11:11 by reinelt]
USBLCD buffered I/O
Diffstat (limited to '')
-rw-r--r--USBLCD.c54
1 files changed, 28 insertions, 26 deletions
diff --git a/USBLCD.c b/USBLCD.c
index 696316b..4f22f69 100644
--- a/USBLCD.c
+++ b/USBLCD.c
@@ -1,4 +1,4 @@
-/* $Id: USBLCD.c,v 1.2 2002/08/17 14:14:21 reinelt Exp $
+/* $Id: USBLCD.c,v 1.3 2002/08/18 08:11:11 reinelt Exp $
*
* Driver for USBLCD ( see http://www.usblcd.de )
* This Driver is based on HD44780.c
@@ -22,6 +22,9 @@
*
*
* $Log: USBLCD.c,v $
+ * Revision 1.3 2002/08/18 08:11:11 reinelt
+ * USBLCD buffered I/O
+ *
* Revision 1.2 2002/08/17 14:14:21 reinelt
*
* USBLCD fixes
@@ -99,42 +102,36 @@ static SEGMENT Segment[128] = {{ len1:0, len2:0, type:255, used:0, ascii:32
{ len1:255, len2:255, type:255, used:0, ascii:255 }};
-static void USBLCD_command (unsigned char cmd)
+static unsigned char Buffer[1024];
+static unsigned char *BufPtr;
+
+static void USBLCD_send ()
{
- char a=0;
-
struct timeval now, end;
gettimeofday (&now, NULL);
-
- write(usblcd_file,&a,1);
- write(usblcd_file,&cmd,1);
+
+ write(usblcd_file,Buffer,BufPtr-Buffer);
gettimeofday (&end, NULL);
+ debug ("send %d: %d usec (%d usec/byte)", BufPtr-Buffer, 1000000*(end.tv_sec-now.tv_sec)+end.tv_usec-now.tv_usec, (1000000*(end.tv_sec-now.tv_sec)+end.tv_usec-now.tv_usec)/(BufPtr-Buffer));
+
+ BufPtr=Buffer;
- debug ("command %x: %d usec", cmd, 1000000*(end.tv_sec-now.tv_sec)+end.tv_usec-now.tv_usec);
+}
+
+
+static void USBLCD_command (unsigned char cmd)
+{
+ *BufPtr++='\0';
+ *BufPtr++=cmd;
}
static void USBLCD_write (char *string, int len)
{
- int len0=len;
- int dur;
- struct timeval now, end;
- gettimeofday (&now, NULL);
-
-#if 0
while (len--) {
- char a=*string++;
- if(a==0) write(usblcd_file,&a,1);
- write(usblcd_file,&a,1);
+ if(*string==0) *BufPtr++=*string;
+ *BufPtr++=*string++;
}
-#else
- write(usblcd_file,string,len);
-
-#endif
- gettimeofday (&end, NULL);
- dur=1000000*(end.tv_sec-now.tv_sec)+end.tv_usec-now.tv_usec;
- debug ("write (%d): %d usec (%d usec/byte)", len0, dur, dur/len0);
-
}
@@ -187,6 +184,8 @@ static int USBLCD_open (void)
return -4;
}
+ BufPtr=Buffer;
+
USBLCD_command (0x29); // 8 Bit mode, 1/16 duty cycle, 5x8 font
USBLCD_command (0x08); // Display off, cursor off, blink off
USBLCD_command (0x0c); // Display on, cursor off, blink off
@@ -419,7 +418,8 @@ int USBLCD_init (LCD *Self)
return -1;
USBLCD_clear();
-
+ USBLCD_send();
+
return 0;
}
@@ -544,12 +544,14 @@ int USBLCD_flush (void)
}
}
+ USBLCD_send();
return 0;
}
int USBLCD_quit (void)
{
+ USBLCD_send();
debug ("closing port %s", Port);
close(usblcd_file);
return 0;