lcd.h File Reference

Internal Interface: LCD control and constants. More...

#include <config.h>
#include <rom/lcd.h>

Go to the source code of this file.

Defines
#define	LCD_SHORT_CMD   0
#define	LCD_LONG_CMD   3
#define	LCD_DATA_OFFSET   5
#define	LCD_DATA_SIZE   9
#define	LCD_MODE_SET   0x40
#define	LCD_ENABLE   0x08
#define	LCD_DISABLE   0x00
#define	LCD_DEV_ID   0x7c
#define	I2C_WRITE   0
#define	I2C_READ   1
#define	SCL   5
#define	SDA   6
Functions
void	lcd_init (void)
	initialize LCD driver
void	lcd_power_on (void)
	power on LCD display, also called from lcd_init()
void	lcd_power_off (void)
	power off LCD display
void	lcd_refresh (void)
	show LCD display contents to the world
void	lcd_refresh_next_byte (void)
	show LCD display contents to the world
Variables
unsigned char	display_memory []
	LCD display data buffer.

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Detailed Description

Internal Interface: LCD control and constants.

Author:

Eddie C. Dost <ecd@skynet.be>

Definition in file lcd.h.

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Define Documentation

#define I2C_READ   1

Definition at line 61 of file lcd.h.

#define I2C_WRITE   0

Definition at line 60 of file lcd.h.

#define LCD_DATA_OFFSET   5

Definition at line 47 of file lcd.h.

#define LCD_DATA_SIZE   9

Definition at line 48 of file lcd.h.

#define LCD_DEV_ID   0x7c

Definition at line 58 of file lcd.h. Referenced by lcd_init().

#define LCD_DISABLE   0x00

Definition at line 54 of file lcd.h.

#define LCD_ENABLE   0x08

Definition at line 53 of file lcd.h.

#define LCD_LONG_CMD   3

Definition at line 46 of file lcd.h. Referenced by lcd_refresh().

#define LCD_MODE_SET   0x40

Definition at line 52 of file lcd.h. Referenced by lcd_power_off(), and lcd_power_on().

#define LCD_SHORT_CMD   0

Definition at line 45 of file lcd.h. Referenced by lcd_power_off(), and lcd_power_on().

#define SCL   5

Definition at line 63 of file lcd.h. Referenced by i2c_read_ack(), i2c_start(), i2c_stop(), i2c_write(), lcd_init(), and lcd_power_off().

#define SDA   6

Definition at line 64 of file lcd.h. Referenced by i2c_start(), i2c_stop(), i2c_write(), lcd_init(), and lcd_power_off().

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Function Documentation

void lcd_init (  void   )

initialize LCD driver output drivers are configured as outputs. the lcd_shadow buffer is cleared and initialized. the LCD controller is enabled. Definition at line 295 of file lcd.c. References clr, LCD_DEV_ID, lcd_power_on(), lcd_shadow, memset(), PORT6_DDR, rom_port6_ddr, SCL, and SDA. Referenced by kmain().

void lcd_power_off (  void   )

power off LCD display the LCD controller is put in low power mode and output drivers to the LCD controller are disabled. Note: without disabling the output drivers the CPU will not save power in sleep mode. Definition at line 279 of file lcd.c. References clr, LCD_MODE_SET, lcd_refresh(), lcd_shadow, LCD_SHORT_CMD, lcd_write_data(), SCL, and SDA. Referenced by kmain().

void lcd_power_on (  void   )

power on LCD display, also called from lcd_init() the LCD controller is enabled. Definition at line 266 of file lcd.c. References LCD_MODE_SET, lcd_shadow, LCD_SHORT_CMD, and lcd_write_data(). Referenced by lcd_init().

void lcd_refresh (  void   )

show LCD display contents to the world the entire 9 bytes of display_memory are written to the LCD controller unconditionally. lcd_shadow is updated to the new values. Definition at line 254 of file lcd.c. References display_memory, LCD_LONG_CMD, lcd_shadow, and lcd_write_data(). Referenced by kmain(), lcd_power_off(), show_off(), and show_on().

void lcd_refresh_next_byte (  void   )

show LCD display contents to the world display updates are realized on a byte basis by calling this function: the complete display will be updated after 9 calls.

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Variable Documentation

unsigned char display_memory[]

LCD display data buffer. Referenced by lcd_refresh().

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