diff options
Diffstat (limited to 'M50530.c')
| -rw-r--r-- | M50530.c | 68 |
1 files changed, 47 insertions, 21 deletions
@@ -1,4 +1,4 @@ -/* $Id: M50530.c,v 1.10 2003/08/15 07:54:07 reinelt Exp $ +/* $Id: M50530.c,v 1.11 2003/08/16 07:31:35 reinelt Exp $ * * driver for display modules based on the M50530 chip * @@ -20,6 +20,9 @@ * * * $Log: M50530.c,v $ + * Revision 1.11 2003/08/16 07:31:35 reinelt + * double buffering in all drivers + * * Revision 1.10 2003/08/15 07:54:07 reinelt * HD44780 4 bit mode implemented * @@ -81,10 +84,12 @@ #define CHARS 8 static LCD Lcd; - -static char Txt[8][40]; static int GPO=0; +static char *FrameBuffer1=NULL; +static char *FrameBuffer2=NULL; + + static unsigned char SIGNAL_EX; static unsigned char SIGNAL_IOC1; static unsigned char SIGNAL_IOC2; @@ -153,19 +158,13 @@ static void M5_define_char (int ascii, char *buffer) int M5_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(); - GPO=0; if (full) { + memset (FrameBuffer2, ' ', Lcd.rows*Lcd.cols*sizeof(char)); M5_command (0x0001, 1250); // clear display M5_setGPO (GPO); // All GPO's off } @@ -205,6 +204,14 @@ int M5_init (LCD *Self) Self->gpos=gpos; 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 ("HD44780: framebuffer could not be allocated: malloc() failed"); + return -1; + } + if ((SIGNAL_EX = parport_wire_ctrl ("EX", "STROBE"))==0xff) return -1; if ((SIGNAL_IOC1 = parport_wire_ctrl ("IOC1", "SELECT"))==0xff) return -1; if ((SIGNAL_IOC2 = parport_wire_ctrl ("IOC2", "AUTOFD"))==0xff) return -1; @@ -245,7 +252,7 @@ void M5_goto (int row, int col) int M5_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) { @@ -277,9 +284,8 @@ int M5_gpo (int num, int val) int M5_flush (void) { - unsigned char buffer[256]; - unsigned char *p; - int c, row, col; + int row, col, pos1, pos2; + int c, equal; bar_process(M5_define_char); @@ -288,19 +294,27 @@ int M5_flush (void) c=bar_peek(row, col); if (c!=-1) { if (c!=32) c+=248; //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; M5_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>2) break; + } else { + pos2=col; + equal=0; + } } - M5_write (buffer, p-buffer); + M5_write (FrameBuffer1+row*Lcd.cols+pos1, pos2-pos1+1); } } + + memcpy (FrameBuffer2, FrameBuffer1, Lcd.rows*Lcd.cols*sizeof(char)); M5_setGPO(GPO); @@ -310,6 +324,18 @@ int M5_flush (void) int M5_quit (void) { + info("M50530: shutting down."); + + if (FrameBuffer1) { + free(FrameBuffer1); + FrameBuffer1=NULL; + } + + if (FrameBuffer2) { + free(FrameBuffer2); + FrameBuffer2=NULL; + } + return parport_close(); } |