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authorreinelt <>2003-08-16 07:31:35 +0000
committerreinelt <>2003-08-16 07:31:35 +0000
commita8d642c8c2dcb10ebaf878b7b97c7da8f8c3062d (patch)
treeb96e57eecc9c13dbd925ef913e4fb19a9c39c13e /Cwlinux.c
parent42e23909e0118d73b2657f9d4423cffd1a0ea3a0 (diff)
downloadlcd4linux-a8d642c8c2dcb10ebaf878b7b97c7da8f8c3062d.tar.gz
[lcd4linux @ 2003-08-16 07:31:35 by reinelt]
double buffering in all drivers
Diffstat (limited to 'Cwlinux.c')
-rw-r--r--Cwlinux.c71
1 files changed, 49 insertions, 22 deletions
diff --git a/Cwlinux.c b/Cwlinux.c
index 6320a72..4866a61 100644
--- a/Cwlinux.c
+++ b/Cwlinux.c
@@ -1,4 +1,4 @@
-/* $Id: Cwlinux.c,v 1.10 2003/08/01 05:15:42 reinelt Exp $
+/* $Id: Cwlinux.c,v 1.11 2003/08/16 07:31:35 reinelt Exp $
*
* driver for Cwlinux serial display modules
*
@@ -20,6 +20,9 @@
*
*
* $Log: Cwlinux.c,v $
+ * Revision 1.11 2003/08/16 07:31:35 reinelt
+ * double buffering in all drivers
+ *
* Revision 1.10 2003/08/01 05:15:42 reinelt
* last cleanups for 0.9.9
*
@@ -81,7 +84,8 @@ static char *Port = NULL;
static speed_t Speed;
static int Device = -1;
-static char Txt[4][20];
+static char *FrameBuffer1=NULL;
+static char *FrameBuffer2=NULL;
static int CW_open(void)
@@ -162,7 +166,7 @@ static int CW_read(char *string, int len)
static void CW_Goto(int row, int col)
{
- char cmd[5]="\376Gxy\375";
+ char cmd[6]="\376Gxy\375";
cmd[2]=(char)col;
cmd[3]=(char)row;
CW_write(cmd,5);
@@ -208,17 +212,12 @@ static void CW1602_define_char (int ascii, char *buffer)
int CW_clear(int full)
{
- int row, col;
-
- for (row = 0; row < Lcd.rows; row++) {
- for (col = 0; col < Lcd.cols; col++) {
- Txt[row][col] = '\t';
- }
- }
+ memset (FrameBuffer1, ' ', Lcd.rows*Lcd.cols*sizeof(char));
bar_clear();
if (full) {
+ memset (FrameBuffer2, ' ', Lcd.rows*Lcd.cols*sizeof(char));
#if 0
CW_write("\376X\375",3);
#else
@@ -271,6 +270,14 @@ int CW_init(LCD * Self)
Lcd = *Self;
+ // Init the framebuffers
+ FrameBuffer1 = (char*)malloc(Lcd.cols*Lcd.rows*sizeof(char));
+ FrameBuffer2 = (char*)malloc(Lcd.cols*Lcd.rows*sizeof(char));
+ if (FrameBuffer1==NULL || FrameBuffer2==NULL) {
+ error ("Cwlinux: framebuffer could not be allocated: malloc() failed");
+ return -1;
+ }
+
if (Port) {
free(Port);
Port = NULL;
@@ -344,7 +351,7 @@ int CW_init(LCD * Self)
int CW_put(int row, int col, char *text)
{
- char *p = &Txt[row][col];
+ char *p=FrameBuffer1+row*Lcd.cols+col;
char *t = text;
while (*t && col++ <= Lcd.cols) {
@@ -362,30 +369,36 @@ int CW_bar(int type, int row, int col, int max, int len1, int len2)
int CW_flush(void)
{
- char buffer[256];
- char *p;
- int c, row, col;
+ int row, col, pos1, pos2;
+ int c, equal;
for (row = 0; row < Lcd.rows; row++) {
for (col = 0; col < Lcd.cols; col++) {
c=bar_peek(row, col);
if (c!=-1) {
if (c!=32) c++; //blank
- Txt[row][col]=(char)c;
+ FrameBuffer1[row*Lcd.cols+col]=(char)c;
}
}
for (col = 0; col < Lcd.cols; col++) {
- if (Txt[row][col] == '\t')
- continue;
+ if (FrameBuffer1[row*Lcd.cols+col]==FrameBuffer2[row*Lcd.cols+col]) continue;
CW_Goto(row, col);
- for (p = buffer; col < Lcd.cols; col++, p++) {
- if (Txt[row][col] == '\t')
- break;
- *p = Txt[row][col];
+ for (pos1=col++, pos2=pos1, equal=0; col<Lcd.cols; col++) {
+ if (FrameBuffer1[row*Lcd.cols+col]==FrameBuffer2[row*Lcd.cols+col]) {
+ // If we find just one equal byte, we don't break, because this
+ // would require a goto, which takes one byte, too.
+ if (++equal>6) break;
+ } else {
+ pos2=col;
+ equal=0;
+ }
}
- CW_write(buffer, p - buffer);
+ CW_write (FrameBuffer1+row*Lcd.cols+pos1, pos2-pos1+1);
}
}
+
+ memcpy (FrameBuffer2, FrameBuffer1, Lcd.rows*Lcd.cols*sizeof(char));
+
return 0;
}
@@ -404,9 +417,23 @@ int CW1602_flush(void)
int CW_quit(void)
{
+ info("Cwlinux: shutting down.");
+
debug("closing port %s", Port);
close(Device);
unlock_port(Port);
+
+
+ if (FrameBuffer1) {
+ free(FrameBuffer1);
+ FrameBuffer1=NULL;
+ }
+
+ if (FrameBuffer2) {
+ free(FrameBuffer2);
+ FrameBuffer2=NULL;
+ }
+
return (0);
}