diff options
Diffstat (limited to '')
| -rw-r--r-- | HD44780.c | 195 |
1 files changed, 167 insertions, 28 deletions
@@ -1,4 +1,4 @@ -/* $Id: HD44780.c,v 1.14 2001/03/12 13:44:58 reinelt Exp $ +/* $Id: HD44780.c,v 1.15 2001/03/14 15:14:59 reinelt Exp $ * * driver for display modules based on the HD44780 chip * @@ -20,6 +20,9 @@ * * * $Log: HD44780.c,v $ + * Revision 1.15 2001/03/14 15:14:59 reinelt + * added ppdev parallel port access + * * Revision 1.14 2001/03/12 13:44:58 reinelt * * new udelay() using Time Stamp Counters @@ -109,18 +112,32 @@ #include <stdio.h> #include <string.h> #include <unistd.h> +#include <fcntl.h> #include <time.h> #include <errno.h> +#include <sys/ioctl.h> + #ifdef HAVE_SYS_IO_H #include <sys/io.h> +#define WITH_OUTB #else #ifdef HAVE_ASM_IO_H #include <asm/io.h> -#else -#error "neither sys/io.h nor asm/io.h found!" +#define WITH_OUTB #endif #endif +#if defined (HAVE_LINUX_PARPORT_H) && defined (HAVE_LINUX_PPDEV_H) +#define WITH_PPDEV +#include <linux/parport.h> +#include <linux/ppdev.h> +#endif + +#if !defined(WITH_OUTB) && !defined(WITH_PPDEV) +#error neither outb() nor ppdev() possible +#error cannot compile HD44780 driver +#endif + #include "debug.h" #include "cfg.h" #include "display.h" @@ -147,7 +164,16 @@ typedef struct { } SEGMENT; static LCD Lcd; + + +#ifdef WITH_OUTB static unsigned short Port=0; +#endif + +#ifdef WITH_PPDEV +static char *PPdev=NULL; +static int PPfd=-1; +#endif static char Txt[4][40]; static BAR Bar[4][40]; @@ -157,43 +183,142 @@ static int nSegment=2; 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 HD_command (unsigned char cmd, int delay) +#ifdef WITH_PPDEV +static void HD_toggle (int bit) { - outb (cmd, Port); // put data on DB1..DB8 - outb (0x02, Port+2); // set Enable = bit 0 invertet - udelay (1); - outb (0x03, Port+2); // clear Enable - udelay (delay); + struct ppdev_frob_struct frob; + + frob.mask=bit; + frob.val=0; // rise (inverted!) + ioctl (PPfd, PPFCONTROL, &frob); + udelay(1); + frob.val=bit; // lower (inverted!) + ioctl (PPfd, PPFCONTROL, &frob); } +#endif -static void HD_write (char *string, int len, int delay) +static void HD_command (unsigned char cmd, int delay) { - while (len--) { - outb (*string++, Port); // put data on DB1..DB8 - outb (0x00, Port+2); // set Enable = bit 0 invertet + if (PPdev) { + +#ifdef WITH_PPDEV + struct ppdev_frob_struct frob; + + // clear RS (inverted) + frob.mask=PARPORT_CONTROL_AUTOFD; + frob.val=PARPORT_CONTROL_AUTOFD; + ioctl (PPfd, PPFCONTROL, &frob); + + // put data on DB1..DB8 + ioctl(PPfd, PPWDATA, &cmd); + + // send command + HD_toggle(PARPORT_CONTROL_STROBE); + + // wait + udelay(delay); +#endif + + } else { + +#ifdef WITH_OUTB + outb (cmd, Port); // put data on DB1..DB8 + outb (0x02, Port+2); // set Enable = bit 0 invertet udelay (1); - outb (0x01, Port+2); // clear Enable + outb (0x03, Port+2); // clear Enable udelay (delay); +#endif + } } +static void HD_write (char *string, int len, int delay) +{ + if (PPdev) { + + struct ppdev_frob_struct frob; + + // set RS (inverted) + frob.mask=PARPORT_CONTROL_AUTOFD; + frob.val=0; + ioctl (PPfd, PPFCONTROL, &frob); + + while (len--) { + + // put data on DB1..DB8 + ioctl(PPfd, PPWDATA, string++); + + udelay(1); + // send command + HD_toggle(PARPORT_CONTROL_STROBE); + + // wait + udelay(delay); + } + + } else { + + while (len--) { + outb (*string++, Port); // put data on DB1..DB8 + outb (0x00, Port+2); // set Enable = bit 0 invertet + udelay (1); + outb (0x01, Port+2); // clear Enable + udelay (delay); + } + + } +} static void HD_setGPO (int bits) { + if (Lcd.gpos>0) { - outb (bits, Port); // put data on DB1..DB8 - outb (0x05, Port+2); // set INIT = bit 2 invertet - udelay (1); - outb (0x03, Port+2); // clear INIT - udelay (1); + + if (PPdev) { + + // put data on DB1..DB8 + ioctl(PPfd, PPWDATA, &bits); + + // toggle INIT + HD_toggle(PARPORT_CONTROL_INIT); + + } else { + outb (bits, Port); // put data on DB1..DB8 + outb (0x05, Port+2); // set INIT = bit 2 invertet + udelay (1); + outb (0x03, Port+2); // clear INIT + udelay (1); + } } } static int HD_open (void) { - debug ("using port 0x%x", Port); - if (ioperm(Port, 3, 1)!=0) { - error ("HD44780: ioperm(0x%x) failed: %s", Port, strerror(errno)); - return -1; + + if (PPdev) { + debug ("using ppdev %s", PPdev); + PPfd=open(PPdev, O_RDWR); + if (PPfd==-1) { + error ("open(%s) failed: %s", PPdev, strerror(errno)); + return -1; + } +#if 0 + if (ioctl(PPfd, PPEXCL)) { + error ("ioctl(%s, PPEXCL) failed: %s", PPdev, strerror(errno)); + return -1; + } +#endif + if (ioctl(PPfd, PPCLAIM)) { + error ("ioctl(%s, PPCLAIM) failed: %s", PPdev, strerror(errno)); + return -1; + } + } else { + + debug ("using raw port 0x%x", Port); + if (ioperm(Port, 3, 1)!=0) { + error ("HD44780: ioperm(0x%x) failed: %s", Port, strerror(errno)); + return -1; + } + } HD_command (0x30, 4100); // 8 Bit mode, wait 4.1 ms @@ -402,11 +527,17 @@ int HD_init (LCD *Self) error ("HD44780: no 'Port' entry in %s", cfg_file()); return -1; } + PPdev=NULL; if ((Port=strtol(s, &e, 0))==0 || *e!='\0') { +#if 0 error ("HD44780: bad port '%s' in %s", s, cfg_file()); return -1; +#endif + // use PPdev + Port=0; + PPdev=s; } - + #ifdef USE_OLD_UDELAY s=cfg_get ("Delay"); if (s==NULL || *s=='\0') { @@ -598,10 +729,18 @@ int HD_flush (void) int HD_quit (void) { - debug ("closing port 0x%x", Port); - if (ioperm(Port, 3, 0)!=0) { - error ("HD44780: ioperm(0x%x) failed: %s", Port, strerror(errno)); - return -1; + if (PPdev) { + debug ("closing ppdev %s", PPdev); + if (close(PPfd)==-1) { + error ("close(%s) failed: %s", PPdev, strerror(errno)); + return -1; + } + } else { + debug ("closing raw port 0x%x", Port); + if (ioperm(Port, 3, 0)!=0) { + error ("HD44780: ioperm(0x%x) failed: %s", Port, strerror(errno)); + return -1; + } } return 0; } |