diff options
Diffstat (limited to 'drv_HD44780.c')
| -rw-r--r-- | drv_HD44780.c | 203 |
1 files changed, 150 insertions, 53 deletions
diff --git a/drv_HD44780.c b/drv_HD44780.c index 7bcaade..c3d776e 100644 --- a/drv_HD44780.c +++ b/drv_HD44780.c @@ -1,4 +1,4 @@ -/* $Id: drv_HD44780.c,v 1.7 2004/01/30 07:12:35 reinelt Exp $ +/* $Id: drv_HD44780.c,v 1.8 2004/02/01 08:05:12 reinelt Exp $ * * new style driver for HD44780-based displays * @@ -29,6 +29,11 @@ * * * $Log: drv_HD44780.c,v $ + * Revision 1.8 2004/02/01 08:05:12 reinelt + * Crystalfontz 633 extensions (CRC checking and stuff) + * Models table for HD44780 + * Noritake VFD BVrightness patch from Bill Paxton + * * Revision 1.7 2004/01/30 07:12:35 reinelt * HD44780 busy-flag support from Martin Hejl * loadavg() uClibc replacement from Martin Heyl @@ -93,6 +98,8 @@ static char Name[]="HD44780"; +static int Model; +static int Capabilities; /* low level communication timings [nanoseconds] * as these values differ from spec to spec, @@ -131,7 +138,7 @@ static unsigned char SIGNAL_GPO; /* maximum time to wait for the busy-flag (in usec) */ #define MAX_BUSYFLAG_WAIT 100000 -static int use_busy_flag = 0; +static int UseBusy = 0; // Fixme @@ -139,6 +146,23 @@ static int GPOS; // static int GPO=0; +typedef struct { + int type; + char *name; + int capabilities; +} MODEL; + +#define CAP_BRIGHTNESS (1<<0) +#define CAP_BUSY4BIT (1<<1) + +static MODEL Models[] = { + { 0x01, "generic", 0 }, + { 0x02, "Noritake", CAP_BRIGHTNESS }, + { 0x03, "Soekris", CAP_BUSY4BIT }, + { 0xff, "Unknown", 0 } +}; + + // **************************************** // *** hardware dependant functions *** // **************************************** @@ -321,7 +345,7 @@ static void drv_HD_command (unsigned char controller, unsigned char cmd, int del } // wait for command completion - if (!use_busy_flag) udelay(delay); + if (!UseBusy) udelay(delay); } @@ -333,7 +357,7 @@ static void drv_HD_data (unsigned char controller, char *string, int len, int de // sanity check if (len<=0) return; - if (use_busy_flag) wait_for_busy_flag(controller); + if (UseBusy) wait_for_busy_flag(controller); if (Bits==8) { @@ -345,7 +369,7 @@ static void drv_HD_data (unsigned char controller, char *string, int len, int de if (controller&0x01) enable|=SIGNAL_ENABLE; if (controller&0x02) enable|=SIGNAL_ENABLE2; - if (!use_busy_flag) { + if (!UseBusy) { // clear RW, set RS drv_generic_parport_control (SIGNAL_RW | SIGNAL_RS, SIGNAL_RS); // Address set-up time @@ -354,7 +378,7 @@ static void drv_HD_data (unsigned char controller, char *string, int len, int de while (len--) { - if (use_busy_flag) { + if (UseBusy) { wait_for_busy_flag(controller); // clear RW, set RS drv_generic_parport_control (SIGNAL_RW | SIGNAL_RS, SIGNAL_RS); @@ -369,19 +393,19 @@ static void drv_HD_data (unsigned char controller, char *string, int len, int de drv_generic_parport_toggle (enable, 1, T_PW); // wait for command completion - if (!use_busy_flag) udelay(delay); + if (!UseBusy) udelay(delay); } } else { // 4 bit mode while (len--) { - if (use_busy_flag) wait_for_busy_flag(controller); + if (UseBusy) wait_for_busy_flag(controller); // send data with RS enabled drv_HD_byte (controller, *(string++), SIGNAL_RS); // wait for command completion - if (!use_busy_flag) udelay(delay); + if (!UseBusy) udelay(delay); } } } @@ -416,11 +440,81 @@ static void drv_HD_goto (int row, int col) } +static void drv_HD_write (char *string, int len) +{ + drv_HD_data (currController, string, len, T_EXEC); +} + + +static void drv_HD_defchar (int ascii, char *buffer) +{ + // define chars on *both* controllers! + drv_HD_command (allControllers, 0x40|8*ascii, T_EXEC); + drv_HD_data (allControllers, buffer, 8, T_WRCG); +} + + +static int drv_HD_brightness (int brightness) +{ + char cmd; + + if (!(Capabilities & CAP_BRIGHTNESS)) return -1; + + if (brightness<0) brightness=0; + if (brightness>3) brightness=3; + + cmd='0'+brightness; + + drv_HD_command (allControllers, 0x38, T_EXEC); // enable function + drv_HD_data (allControllers, &cmd, 1, T_WRCG); // set brightness + + return brightness; +} + + +// Fixme +#if 0 +static void drv_HD_setGPO (int bits) +{ + if (Lcd.gpos>0) { + + // put data on DB1..DB8 + drv_generic_parport_data (bits); + + // 74HCT573 set-up time + ndelay(20); + + // send data + // 74HCT573 enable pulse width = 24ns + drv_generic_parport_toggle (SIGNAL_GPO, 1, 230); + } +} +#endif + + static int drv_HD_start (char *section) { + char *model, *s; int rows=-1, cols=-1, gpos=-1; - char *s; + model=cfg_get(section, "Model", NULL); + if (model!=NULL && *model!='\0') { + int i; + for (i=0; Models[i].type!=0xff; i++) { + if (strcasecmp(Models[i].name, model)==0) break; + } + if (Models[i].type==0xff) { + error ("%s: %s.Model '%s' is unknown from %s", Name, section, model, cfg_source()); + return -1; + } + Model=i; + Capabilities=Models[Model].capabilities; + info ("%s: using model '%s'", Name, Models[Model].name); + } else { + error ("%s: no '%s.Model' entry from %s", Name, section, cfg_source()); + return -1; + } + s=cfg_get(section, "Size", NULL); if (s==NULL || *s=='\0') { error ("%s: no '%s.Size' entry from %s", Name, section, cfg_source()); @@ -499,59 +593,42 @@ static int drv_HD_start (char *section) drv_HD_command (allControllers, 0x08, T_EXEC); // Display off, cursor off, blink off drv_HD_command (allControllers, 0x0c, T_CLEAR); // Display on, cursor off, blink off, wait 1.64 ms drv_HD_command (allControllers, 0x06, T_EXEC); // curser moves to right, no shift + + // maybe use busy-flag from now on + // (we can't use the busy flag during the init sequence) + cfg_number(section, "UseBusy", 0, 0, 1, &UseBusy); + + // make sure we don't use the busy flag with RW wired to GND + if (UseBusy && SIGNAL_RW) { + error("%s: Busyflag is to be used, but RW is wired to GND", Name); + UseBusy=0; + } - // Save it in a local variable, until init is complete (for init, we can't use the busy flag) - if (cfg_number(section, "UseBusy", 0, 0, 1, &use_busy_flag)<0) return -1; - - // Make sure we don't use the busy flag, if it's set to GND - if (SIGNAL_RW == 0 && use_busy_flag != 0 ) { - debug("HD44780: Busyflag is to be used, but wiring set RW to GND. Disabling busy-flag"); - use_busy_flag=0; + // make shure the display supports busy-flag checking in 4-Bit-Mode + // at the moment this is inly possible with martin Hejl's gpio driver, + // which allows to use 4 bits as input and 4 bits as output + if (UseBusy && Bits==4 && !(Capabilities&CAP_BUSY4BIT)) { + error("%s: Model '%s' does not support busy-flag checking in 4-bit-mode", Name, Models[Model].name); + UseBusy=0; } - info("HD44780: %susing Busyflag", use_busy_flag?"":"not "); + info("%s: %susing busy-flag checking", Name, UseBusy?"":"not "); drv_HD_command (allControllers, 0x01, T_CLEAR); // clear *both* displays drv_HD_command (allControllers, 0x03, T_CLEAR); // return home + + // maybe set brightness + if (Capabilities & CAP_BRIGHTNESS) { + int brightness; + if (cfg_number(section, "Brightness", 0, 0, 3, &brightness)==0) { + drv_HD_brightness(brightness); + } + } - return 0; } -static void drv_HD_write (char *string, int len) -{ - drv_HD_data (currController, string, len, T_EXEC); -} - - -static void drv_HD_defchar (int ascii, char *buffer) -{ - // define chars on *both* controllers! - drv_HD_command (allControllers, 0x40|8*ascii, T_EXEC); - drv_HD_data (allControllers, buffer, 8, T_WRCG); -} - - -// Fixme -#if 0 -static void drv_HD_setGPO (int bits) -{ - if (Lcd.gpos>0) { - - // put data on DB1..DB8 - drv_generic_parport_data (bits); - - // 74HCT573 set-up time - ndelay(20); - - // send data - // 74HCT573 enable pulse width = 24ns - drv_generic_parport_toggle (SIGNAL_GPO, 1, 230); - } -} -#endif - // **************************************** // *** plugins *** // **************************************** @@ -575,7 +652,11 @@ static void drv_HD_setGPO (int bits) // list models int drv_HD_list (void) { - printf ("any"); + int i; + + for (i=0; Models[i].type!=0xff; i++) { + printf ("%s ", Models[i].name); + } return 0; } @@ -665,3 +746,19 @@ DRIVER drv_HD44780 = { quit: drv_HD_quit, }; + +#if 0 ++ ++// Change Noritake CU series VFD brightness level ++ char tmpbuffer[2]; ++ int cu_vfd_brightness; ++ if (cfg_number("CU_VFD_Brightness", 0, 0, 3, &cu_vfd_brightness)<0) return -1; ++ if (cu_vfd_brightness) { + + snprintf (tmpbuffer, 2, "\%o", cu_vfd_brightness); + + HD_command (0x03, 0x38, T_EXEC); // enable function + + HD_write (0x03, tmpbuffer, 1, T_WRCG); // set brightness + + info ("HD44780: Noritake CU VFD detected. Brightness = %d (0-3)", cu_vfd_brightness); + + info (" Settings: 0=100\%, 1=75\%, 2=50\%, 3=25\%"); + + } + +#endif |