diff options
| -rw-r--r-- | drv_HD44780.c | 130 | ||||
| -rw-r--r-- | drv_generic_parport.h | 28 | ||||
| -rw-r--r-- | lcd4linux.conf.sample | 19 |
3 files changed, 155 insertions, 22 deletions
diff --git a/drv_HD44780.c b/drv_HD44780.c index 5af3162..b3c6422 100644 --- a/drv_HD44780.c +++ b/drv_HD44780.c @@ -1,4 +1,4 @@ -/* $Id: drv_HD44780.c,v 1.38 2004/09/19 09:31:19 reinelt Exp $ +/* $Id: drv_HD44780.c,v 1.39 2004/10/17 09:24:31 reinelt Exp $ * * new style driver for HD44780-based displays * @@ -29,6 +29,9 @@ * * * $Log: drv_HD44780.c,v $ + * Revision 1.39 2004/10/17 09:24:31 reinelt + * I2C support for HD44780 displays by Luis (does not work by now) + * * Revision 1.38 2004/09/19 09:31:19 reinelt * HD44780 busy flag checking improved: fall back to busy-waiting if too many errors occur * @@ -212,6 +215,13 @@ #include <termios.h> #include <fcntl.h> #include <sys/time.h> +#include <sys/ioctl.h> + +// I2C support does not compile +#if 0 +#include <linux/i2c.h> +#include <linux/i2c-dev.h> +#endif #include "debug.h" #include "cfg.h" @@ -312,6 +322,10 @@ static MODEL Models[] = { }; +/* handle for I2C device */ +static int i2c_device; + + /****************************************/ /*** generic functions ***/ @@ -701,42 +715,138 @@ static void drv_HD_PP_stop (void) /****************************************/ -static void drv_HD_I2C_command (const unsigned char controller, const unsigned char cmd, const int delay) +static void drv_HD_I2C_nibble (const unsigned char controller, const unsigned char nibble) +{ +// I2C support does not compile +#if 0 + /* clear ENABLE */ + /* put data on DB1..DB4 */ + /* nibble already contains RS bit! */ + i2c_smbus_write_byte_data(i2c_device, 0, nibble); + + /* Address set-up time */ + ndelay(T_AS); + + /* rise ENABLE */ + i2c_smbus_write_byte_data(i2c_device, 0, nibble | SIGNAL_ENABLE); + + /* Enable pulse width */ + ndelay(T_PW); + + /* lower ENABLE */ + i2c_smbus_write_byte_data(i2c_device, 0, nibble); + + /* Address hold time */ + ndelay(T_H); +#endif +} + + +static void drv_HD_I2C_byte (const unsigned char controller, const unsigned char data) { /* send data with RS disabled */ - // drv_HD_I2C_byte (controller, cmd, 0); + /* send high nibble of the data */ + drv_HD_I2C_nibble (controller, ((data>>4)&0x0f)|SIGNAL_RS); + + /* Make sure we honour T_CYCLE */ + ndelay(T_CYCLE-T_AS-T_PW); + + /* send low nibble of the data */ + drv_HD_I2C_nibble(controller, (data&0x0f)|SIGNAL_RS); } +static void drv_HD_I2C_command (const unsigned char controller, const unsigned char cmd, const int delay) +{ + /* send data with RS disabled */ + drv_HD_I2C_byte (controller, cmd); + + /* wait for command completion */ + udelay(delay); +} + static void drv_HD_I2C_data (const unsigned char controller, const char *string, const int len, const int delay) { int l = len; - unsigned char enable; - + /* sanity check */ if (len<=0) return; - + while (l--) { /* send data with RS enabled */ - // drv_HD_I2C_byte (controller, *(string++), SIGNAL_RS); + drv_HD_I2C_byte (controller, *(string++)); + + /* wait for command completion */ + udelay(delay); } } static int drv_HD_I2C_load (const char *section) { + int dev; + char *bus,*device; + + bus = cfg_get(section, "Port", NULL); + device = cfg_get(section, "Device", NULL); + dev = 0x70; + + info("%s: initializing I2C bus %s",Name,bus); + if ((i2c_device = open(bus,O_RDWR)) < 0) { + error("%s: I2C bus %s open failed !\n",Name,bus); + return -1; + } + + info("%s: initializing I2C slave device 0x%x",Name,dev); +// I2C support does not compile +#if 0 + if (ioctl(i2c_device,I2C_SLAVE, (dev>>1) ) < 0) { + error("%s: error initializing device 0x%x\n",Name,dev); + close(i2c_device); + return -1; + } +#endif + + info("%s: detecting I2C device 0x%x on bus %s ",Name,dev,bus); +// I2C support does not compile +#if 0 + if (i2c_smbus_write_quick(i2c_device,I2C_SMBUS_WRITE) < 0) { + error("%s: i2c slave-device 0x%x not found!\n",Name,dev); + close(i2c_device); + return -1; + } +#endif + + if (cfg_number(section, "Bits", 8, 4, 8, &Bits)<0) return -1; + if (Bits!=4) { + error ("%s: bad %s.Bits '%d' from %s, should be '4' ", Name, section, Bits, cfg_source()); + return -1; + } + + info ("%s: using %d bit mode", Name, Bits); + + /* initialize *both* displays */ + drv_HD_I2C_nibble (allControllers, 0x03); udelay(T_INIT1); /* 4 Bit mode, wait 4.1 ms */ + drv_HD_I2C_nibble (allControllers, 0x03); udelay(T_INIT2); /* 4 Bit mode, wait 100 us */ + drv_HD_I2C_nibble (allControllers, 0x03); udelay(T_INIT1); /* 4 Bit mode, wait 4.1 ms */ + drv_HD_I2C_nibble (allControllers, 0x02); udelay(T_INIT2); /* 4 Bit mode, wait 100 us */ + drv_HD_I2C_command (allControllers, 0x28, T_EXEC); /* 4 Bit mode, 1/16 duty cycle, 5x8 font */ + + info("%s: I2C initialization done", Name); + return 0; } -static void drv_HD_I2C_stop (void) +static void drv_HD_I2C_stop (void) { /* clear all signals */ // drv_generic_i2c_data (0); - /* slose port */ + /* close port */ // drv_generic_i2c_close(); -} + close(i2c_device); +} /****************************************/ diff --git a/drv_generic_parport.h b/drv_generic_parport.h index 2edf044..1eea335 100644 --- a/drv_generic_parport.h +++ b/drv_generic_parport.h @@ -1,4 +1,4 @@ -/* $Id: drv_generic_parport.h,v 1.7 2004/09/18 15:58:57 reinelt Exp $ +/* $Id: drv_generic_parport.h,v 1.8 2004/10/17 09:24:31 reinelt Exp $ * * generic driver helper for parallel port displays * @@ -23,6 +23,9 @@ * * * $Log: drv_generic_parport.h,v $ + * Revision 1.8 2004/10/17 09:24:31 reinelt + * I2C support for HD44780 displays by Luis (does not work by now) + * * Revision 1.7 2004/09/18 15:58:57 reinelt * even more HD44780 cleanups, hardwiring for LCM-162 * @@ -107,16 +110,17 @@ #ifndef _DRV_GENERIC_PARPORT_H_ #define _DRV_GENERIC_PARPORT_H_ -int drv_generic_parport_open (const char *section, const char *driver); -int drv_generic_parport_close (void); -unsigned char drv_generic_parport_wire_ctrl (const char *name, const char *deflt); -unsigned char drv_generic_parport_wire_data (const char *name, const char *deflt); -void drv_generic_parport_direction (const int direction); -unsigned char drv_generic_parport_status (void); -void drv_generic_parport_control (const unsigned char mask, const unsigned char value); -void drv_generic_parport_toggle (const unsigned char bit, const int level, const int delay); -void drv_generic_parport_data (const unsigned char data); -unsigned char drv_generic_parport_read (void); -void drv_generic_parport_debug (void); +int drv_generic_parport_open (const char *section, const char *driver); +int drv_generic_parport_close (void); +unsigned char drv_generic_parport_wire_ctrl (const char *name, const char *deflt); +unsigned char drv_generic_parport_hardwire_ctrl (const char *name, const char *deflt); +unsigned char drv_generic_parport_wire_data (const char *name, const char *deflt); +void drv_generic_parport_direction (const int direction); +unsigned char drv_generic_parport_status (void); +void drv_generic_parport_control (const unsigned char mask, const unsigned char value); +void drv_generic_parport_toggle (const unsigned char bit, const int level, const int delay); +void drv_generic_parport_data (const unsigned char data); +unsigned char drv_generic_parport_read (void); +void drv_generic_parport_debug (void); #endif diff --git a/lcd4linux.conf.sample b/lcd4linux.conf.sample index cabd335..06e84f6 100644 --- a/lcd4linux.conf.sample +++ b/lcd4linux.conf.sample @@ -105,6 +105,25 @@ Display LCM-162 { } +Display HD44780-I2C { + Driver 'HD44780' + Model 'WRAP1C-PCF8574' + Bus 'i2c' + Port '/dev/i2c-0' + Device '70' + Bits '4' + Size '20x4' + asc255bug 0 + Icons 1 + Wire { + RW 'DB5' + RS 'DB4' + ENABLE 'DB6' + GPO 'GND' + } +} + + Display M50530-24x8 { Driver 'M50530' Port '/dev/parports/0' |