#include <avr/pgmspace.h>
Go to the source code of this file.
Defines | |
#define | HD44780_PORT PORTB |
The data port the display is attached to. | |
#define | HD44780_DDR DDRB |
The data direction register of the display port. | |
#define | HD44780_PIN PINB |
The input register of the display port. | |
#define | HD44780_BIT_ENABLE 5 |
The port bit to use for the enable signal. | |
#define | HD44780_BIT_RW 6 |
The port bit to use for the r/w signal. | |
#define | HD44780_BIT_RS 7 |
The port bit to use for the rs (register select) signal. | |
#define | HD44780_DATA sbi(HD44780_PORT, HD44780_BIT_RS); |
This macro sets the display to data mode. | |
#define | HD44780_INSTR cbi(HD44780_PORT, HD44780_BIT_RS); |
Set the display to instruction mode. | |
#define | HD44780_FIRST_ROW 0x80 |
Command to position the cursor in the first line. | |
#define | HD44780_SECOND_ROW 0xc0 |
As HD44780_FIRST_ROW but positions the cursor in the second row. | |
#define | HD44780_CMD_CLEAR 0x01 |
Command to clear the display contents. | |
Functions | |
void | hd44780_init (void) |
Initialize the electrical interface to the display. | |
void | hd44780_putchar (char c) |
Send one byte to the display. | |
char | hd44780_getchar (void) |
Read a character from the display. | |
void | hd44780_reset (void) |
Reset the display. | |
void | hd44780_put_pgm_str (PGM_P data) |
Print a string out of program memory on the display. | |
void | hd44780_put_str (char *data) |
Print a string out of ram on the display. |
The display is used in 4 bit mode. The port the display is attached to can be defined in this file. The default electrical setup is as follows:
function | rs | rw | e | - | d7 | d6 | d5 | d4 bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0
As you can see bit 4 of the port is not used, so is is also possible to used a seven bit wide port, e.g. PORTA on AT90S2313.
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This macro sets the display to data mode. After calling this macro all data written to the display is written to the data memory i.e. is displayed. |
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Command to position the cursor in the first line. Add the number of characters the cursor should be moved to the right inside this line but not more than the line length |
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Set the display to instruction mode. After calling this macro you can send commands to the display, e.g. for clearing the display, position the cursor, etc. |
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Read a character from the display. Use HD44780_INSTR or HD44780_DATA before calling. |
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Initialize the electrical interface to the display. This method should be called once before the display is used the first time |
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Print a string out of program memory on the display. The display is set to data mode (as HD44780_DATA does) automatically.
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Print a string out of ram on the display. The display is set to data mode (as HD44780_DATA does) automatically.
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Send one byte to the display. Calling HD44780_DATA or HD44780_INSTR before calling this method determines if the data is written as data to display or as a command to execute.
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Reset the display. The display gets cleared, is set two 5x7 pixel mode, 2 lines, etc. This should be called directly after hd44780_init(). |