3.5.1. hd44780 — Dot matrix LCD¶
Source code: src/drivers/displays/hd44780.h, src/drivers/displays/hd44780.c
Example code: examples/drivers/displays/hd44780/main.c
Functions
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int
hd44780_module_init(void)¶ Initialize the driver module. This function must be called before calling any other function in this module.
The module will only be initialized once even if this function is called multiple times.
- Return
- zero(0) or negative error code.
-
int
hd44780_init(struct hd44780_driver_t *self_p, struct pin_device_t *rs_p, struct pin_device_t *enable_p, struct pin_device_t *data_4_p, struct pin_device_t *data_5_p, struct pin_device_t *data_6_p, struct pin_device_t *data_7_p, unsigned int number_of_rows, unsigned int number_of_columns)¶ Initialize driver object. The driver object will be used for a single display.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object to initialize.rs_p: RS pin device.enable_p: RS pin device.data_4_p: Data 4 pin device.data_5_p: Data 5 pin device.data_6_p: Data 6 pin device.data_7_p: Data 7 pin device.number_of_rows: Number of rows.number_of_columns: Number of columns.
-
int
hd44780_start(struct hd44780_driver_t *self_p)¶ Start the driver.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.
-
int
hd44780_stop(struct hd44780_driver_t *self_p)¶ Stop the driver.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.
-
int
hd44780_display(struct hd44780_driver_t *self_p, const char *text_p)¶ Display given text on the display.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.text_p: Text to display.
-
int
hd44780_write(struct hd44780_driver_t *self_p, const char *text_p)¶ Write given text to the display at current cursor position.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.text_p: Text to write to the display.
-
int
hd44780_put(struct hd44780_driver_t *self_p, char character)¶ Write given character to the display at current cursor position.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.character: Character to write to the display.
-
int
hd44780_clear(struct hd44780_driver_t *self_p)¶ Clear the display.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.
-
int
hd44780_cursor_move(struct hd44780_driver_t *self_p, unsigned int row, unsigned int column)¶ Move the cursor to given row and column, relative to the upper left-hand corner of the screen, which is (0, 0).
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.row: Row to move to.column: Colum to move to.
-
int
hd44780_cursor_show(struct hd44780_driver_t *self_p)¶ Show the cursor on the display.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.
-
int
hd44780_cursor_hide(struct hd44780_driver_t *self_p)¶ Do not show the cursor on the display.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.
-
int
hd44780_text_show(struct hd44780_driver_t *self_p)¶ Show the text on the display.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.
-
int
hd44780_text_hide(struct hd44780_driver_t *self_p)¶ Do not show the text on the display.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.
-
int
hd44780_scroll_left(struct hd44780_driver_t *self_p)¶ Scroll the text on the display one position to the left.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.
-
int
hd44780_scroll_right(struct hd44780_driver_t *self_p)¶ Scroll the text on the display one position to the right.
- Return
- zero(0) or negative error code.
- Parameters
self_p: Driver object.
-
struct
hd44780_driver_t¶ Public Members
-
struct pin_device_t *
rs_p¶
-
struct pin_device_t *
enable_p¶
-
struct pin_device_t *
data_4_p¶
-
struct pin_device_t *
data_5_p¶
-
struct pin_device_t *
data_6_p¶
-
struct pin_device_t *
data_7_p¶
-
unsigned int
number_of_rows¶
-
unsigned int
number_of_columns¶
-
unsigned int
row¶
-
unsigned int
column¶
-
struct hd44780_driver_t::@0 hd44780_driver_t::cursor
-
uint8_t
display_on_off_control¶
-
struct pin_device_t *