brickOS Kernel Developer v0.9.0
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Internal Interface: LCD control and constants. More...
Go to the source code of this file.
Macros | |
#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. | |
Internal Interface: LCD control and constants.
Definition in file lcd.h.
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extern |
initialize LCD driver
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, I2C_WRITE, lcd_byte_counter, LCD_DEV_ID, LCD_LONG_CMD, lcd_power_on(), lcd_refresh_counter, lcd_shadow, LCD_SHORT_CMD, memset(), PORT6_DDR, rom_port6_ddr, SCL, and SDA.
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power off LCD display
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_DISABLE, LCD_MODE_SET, lcd_refresh(), lcd_shadow, LCD_SHORT_CMD, lcd_write_data(), SCL, and SDA.
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power on LCD display, also called from lcd_init()
power on LCD display, also called from lcd_init()
the LCD controller is enabled.
Definition at line 266 of file lcd.c.
References LCD_ENABLE, LCD_MODE_SET, lcd_shadow, LCD_SHORT_CMD, and lcd_write_data().
Referenced by lcd_init().
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show LCD display contents to the world
display updates are realized exclusively by calling this function.
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_DATA_OFFSET, LCD_DATA_SIZE, LCD_LONG_CMD, lcd_shadow, and lcd_write_data().
Referenced by lcd_power_off(), show_off(), and show_on().
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extern |
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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extern |
LCD display data buffer.
Referenced by lcd_refresh(), and lcd_refresh_next_byte_core().