aboutsummaryrefslogtreecommitdiff
path: root/3rd-party/LCDHD44780.c
diff options
context:
space:
mode:
Diffstat (limited to '3rd-party/LCDHD44780.c')
-rw-r--r--3rd-party/LCDHD44780.c381
1 files changed, 0 insertions, 381 deletions
diff --git a/3rd-party/LCDHD44780.c b/3rd-party/LCDHD44780.c
deleted file mode 100644
index 8a01a20..0000000
--- a/3rd-party/LCDHD44780.c
+++ /dev/null
@@ -1,381 +0,0 @@
-/*##############################################################*/
-/* Author: Marcus Nasarek */
-/* File: LCDH44780.c */
-/* Compile with: */
-/* gcc -Wall -c LCDHD44780.c -o LCDHD44780.o */
-/* License: */
-/* */
-/* This program is free software; you can redistribute it */
-/* and/or modify it under the terms of the GNU General */
-/* Public License as published by the Free Software */
-/* Foundation; either version 3 of the License, or */
-/* (at your option) any later version. */
-/* */
-/* This program is distributed in the hope that it will */
-/* be useful, but WITHOUT ANY WARRANTY; without even the */
-/* implied warranty of MERCHANTABILITY or */
-/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General */
-/* Public License for more details. */
-/* */
-/* You should have received a copy of the GNU General */
-/* Public License along with this program; if not, */
-/* see <http://www.gnu.org/licenses/>. */
-/* */
-/*##############################################################*/
-
-#include "LCDHD44780.h"
-
-void init_gpio(void)
-{
- // Set all pins to output
- bcm2835_gpio_fsel(LCD_RS, BCM2835_GPIO_FSEL_OUTP);
- bcm2835_gpio_fsel(LCD_D4, BCM2835_GPIO_FSEL_OUTP);
- bcm2835_gpio_fsel(LCD_D5, BCM2835_GPIO_FSEL_OUTP);
- bcm2835_gpio_fsel(LCD_D6, BCM2835_GPIO_FSEL_OUTP);
- bcm2835_gpio_fsel(LCD_D7, BCM2835_GPIO_FSEL_OUTP);
- bcm2835_gpio_fsel(LCD_E, BCM2835_GPIO_FSEL_OUTP);
-
- bcm2835_delayMicroseconds(C_DELAY);
-
- // Set all pins to LOW
- bcm2835_gpio_clr(LCD_RS);
- bcm2835_gpio_clr(LCD_D4);
- bcm2835_gpio_clr(LCD_D5);
- bcm2835_gpio_clr(LCD_D5);
- bcm2835_gpio_clr(LCD_D7);
- bcm2835_gpio_clr(LCD_E);
-
-}
-
-void pulse_e(void)
-{
- // Toogle ENABLE pin in us
- // bcm2835_gpio_fsel(LCD_E, BCM2835_GPIO_FSEL_OUTP);
- bcm2835_delayMicroseconds(E_DELAY);
- bcm2835_gpio_set(LCD_E);
- bcm2835_delayMicroseconds(E_DATA_PULSE);
- bcm2835_gpio_clr(LCD_E);
- (LCD_DATA) ? bcm2835_delayMicroseconds(E_DATA_PULSE) :bcm2835_delayMicroseconds(E_CMD_PULSE);
-}
-
-void init_lcd(void)
-{
- init_gpio();
-
- /*
- The busy flag (BF) is kept in the busy state
- until the initialization ends (BF = 1). The
- busy state lasts for 10 ms after VCC rises to 4.5 V
- */
-
- /*
- --- symbols:
- I/D = 1: Increment
- I/D = 0: Decrement
- S = 1: Accompanies display shift
- S/C = 1: Display shift
- S/C = 0: Cursor move
- R/L = 1: Shift to the right
- R/L = 0: Shift to the left
- DL = 1: 8 bits, DL = 0: 4 bits
- N = 1: 2 lines, N = 0: 1 line
- F = 1: 5
- ×
- 10 dots, F = 0: 5
- ×
- 8 dots
- BF = 1: Internally operating
- BF = 0: Instructions acceptable
- */
-
- /*
- --- Display init after turn on:
- 1. Display clear
- 2. Function set:
- DL = 1; 8-bit interface data
- N = 0; 1-line display
- F = 0; 5×8 dot character font
- 3. Display on/off control:
- D = 0; Display off
- C = 0; Cursor off
- B = 0; Blinking off
- 4. Entry mode set:
- I/D = 1; Increment by 1
- S = 0; No shift
- */
-
- // begin of "warming up"
- // see fig 24 on page 46 of datasheet
-
- // Function set -
- // Sets interface data length
- // (DL), number of display lines
- // (N), and character font (F).
- // RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 0 0 1 DL N F - -
- // DL = 0 --> 4 bit data length (1 = 8 bit)
- // N = 1 --> 2 line display (0 = 1 line)
- // F = 0 --> 5x8 dot character font
- // 0x33 =
- // 0 0 0 0 1 1 0 0 1 1
- // --> ?
- write_to_lcd(0x33, LCD_CMD);
- bcm2835_delayMicroseconds(100);
-
- // Function set -
- // Sets interface data length
- // (DL), number of display lines
- // (N), and character font (F).
- // RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 0 0 1 DL N F - -
- // DL = 0 --> 4 bit data length (1 = 8 bit)
- // N = 1 --> 2 line display (0 = 1 line)
- // F = 0 --> 5x8 dot character font
- // 0x32 =
- // 0 0 0 0 1 1 0 0 1 0
- // --> ?
- write_to_lcd(0x32, LCD_CMD);
- bcm2835_delayMicroseconds(R_EXEC_TIME);
-
- // end of "warming up"
-
- lcd_function_set(TWO_LINES);
-
- lcd_control(DISPLAY_ON);
-
- lcd_entry_mode(ADDR_INCREMENT);
-
- clear_lcd();
-
-}
-
-void lcd_function_set(uint8_t control_flags)
-{
- // Function set -
- // Sets interface data length
- // (DL), number of display lines
- // (N), and character font (F).
- // RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 0 0 1 DL N F - -
- // DL = 0 --> 4 bit data length (1 = 8 bit)
- // N = 1 --> 2 line display (0 = 1 line)
- // F = 0 --> 5x8 dot character font
- // F = 1 --> 5x10 dot character font
- // 0x28 =
- // 0 0 0 0 1 0 1 0 0 0
- write_to_lcd(LCD_FUNCTION_SET | control_flags, LCD_CMD);
- bcm2835_delayMicroseconds(R_EXEC_TIME);
-}
-
-void lcd_control(uint8_t control_flags)
-{
- // Display on/off control -
- // Sets entire display (D) on/off,
- // cursor on/off (C), and
- // blinking of cursor position
- // character (B).
- // RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 0 0 0 0 1 D C B
- // D = 1 --> display on
- // C = 0 --> cursor off
- // B = 0 --> blinking off
- write_to_lcd(LCD_CONTROL | control_flags, LCD_CMD);
- bcm2835_delayMicroseconds(R_EXEC_TIME);
-}
-
-void lcd_shift_control(uint8_t control_flags)
-{
- // Cursor or display shift -
- // Moves the cursor and shifts
- // display without chaning
- // DDRAM contents.
- // Execution time 37us
- // RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 0 0 0 1 S/C R/L - -
- // S/C = cursor/display shift
- // S/C = 0 --> cursor shift
- // R/L = shift direction
- // R/L = 1 --> shift to right
- write_to_lcd(CURSOR_DISPLAY_SHIFT | control_flags, LCD_CMD);
- bcm2835_delayMicroseconds(R_EXEC_TIME);
-}
-
-void lcd_entry_mode(uint8_t control_flags)
-{
- // Entry mode set -
- // Sets cursor move direction
- // and specifies display shift.
- // These operations are
- // performed during data write
- // and read.
- // Execution time 37us
- // RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 0 0 0 0 0 1 I/D S
- // I/D = increment/decrement address pointer
- // I/D = 1 --> increment
- // S = 0 --> no shift
- write_to_lcd(LCD_ENTRY_MODE | control_flags, LCD_CMD);
- bcm2835_delayMicroseconds(R_EXEC_TIME);
-}
-
-void clear_lcd(void) {
- // Clear display -
- // Clears entire display and
- // sets DDRAM address 0 in
- // address counter:
- // RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 0 0 0 0 0 0 0 1
- write_to_lcd(0x01, LCD_CMD);
- bcm2835_delayMicroseconds(R_EXEC_TIME);
-}
-
-void return_home(void)
-{
- // Return home -
- // Sets DDRAM address to 0
- // in address counter. Also
- // returns display from being
- // shifted to original position
- // DDRAM contents remains unchanged
- // RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 0 0 0 0 0 0 1 -
- write_to_lcd(0x02, LCD_CMD);
- bcm2835_delayMicroseconds(R_EXEC_TIME);
-}
-
-
-void display_off(void)
-{
- lcd_control(DISPLAY_OFF);
-}
-
-void show_cursor(bool on)
-{
- uint8_t cursor_flag;
- cursor_flag = ( on ? CURSOR_ON : 0x00);
- lcd_control(DISPLAY_ON | cursor_flag);
-}
-
-void cursor_blinking(bool on)
-{
- uint8_t blinking_flag;
- blinking_flag = ( on ? BLINKING_ON : 0x00);
- lcd_control(DISPLAY_ON | blinking_flag);
-}
-
-void set_cursor(uint8_t addr)
-{
- // Set DDRAM address
- // RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
- // 0 0 1 ADD ADD ADD ADD ADD ADD ADD
- write_to_lcd(addr, LCD_CMD);
- bcm2835_delayMicroseconds(R_EXEC_TIME);
- // fprintf(stdout,"cursor on addr: 0x%0x\n", addr);
-}
-
-void shift_cursor(uint8_t direction)
-{
- lcd_shift_control(CURSOR_SHIFT | direction);
-}
-
-void shift_display(uint8_t direction)
-{
- lcd_shift_control(DISPLAY_SHIFT | direction);
-}
-
-void write_to_lcd(uint8_t byte, uint8_t mode)
-{
- switch (mode) {
- case LCD_CMD:
- bcm2835_gpio_clr(LCD_RS);
- // fprintf(stdout, "Set RS to cmd mode\n");
- break;
- case LCD_DATA:
- bcm2835_gpio_set(LCD_RS);
- // fprintf(stdout, "Set RS to data mode for '%c'\n", byte);
- break;
- default:
- // fprintf(stderr, "mode for setting GPIO pin unknown: %i\n", mode);
- exit(EXIT_FAILURE);
- }
-
- // write high bits
- bcm2835_gpio_clr(LCD_D4);
- bcm2835_gpio_clr(LCD_D5);
- bcm2835_gpio_clr(LCD_D6);
- bcm2835_gpio_clr(LCD_D7);
-
- if ((byte & 0x10) == 0x10) {
- bcm2835_gpio_set(LCD_D4);
- }
- if ((byte & 0x20) == 0x20) {
- bcm2835_gpio_set(LCD_D5);
- }
- if ((byte & 0x40) == 0x40) {
- bcm2835_gpio_set(LCD_D6);
- }
- if ((byte & 0x80) == 0x80) {
- bcm2835_gpio_set(LCD_D7);
- }
-
- // Toogle ENABLE pin in us
- pulse_e();
-
- // write low bits
- bcm2835_gpio_clr(LCD_D4);
- bcm2835_gpio_clr(LCD_D5);
- bcm2835_gpio_clr(LCD_D6);
- bcm2835_gpio_clr(LCD_D7);
-
- if ((byte & 0x01) == 0x01) {
- bcm2835_gpio_set(LCD_D4);
- }
- if ((byte & 0x02) == 0x02) {
- bcm2835_gpio_set(LCD_D5);
- }
- if ((byte & 0x04) == 0x04) {
- bcm2835_gpio_set(LCD_D6);
- }
- if ((byte & 0x08) == 0x08) {
- bcm2835_gpio_set(LCD_D7);
- }
-
- pulse_e();
-
-}
-
-void write_string(char *str)
-{
- uint16_t i;
- uint8_t len = 0;
-
- len = (strlen(str) > LCD_WIDTH ? LCD_WIDTH : strlen(str));
-
- for (i=0; i<len;i++) {
- write_to_lcd(str[i], LCD_DATA);
- }
-}
-
-void gpio_reset(void)
-{
- // bcm2835_gpio_fsel(LCD_RS, BCM2835_GPIO_PUD_OFF);
- // bcm2835_gpio_fsel(LCD_E, BCM2835_GPIO_PUD_OFF);
- // bcm2835_gpio_fsel(LCD_D4, BCM2835_GPIO_PUD_OFF);
- // bcm2835_gpio_fsel(LCD_D5, BCM2835_GPIO_PUD_OFF);
- // bcm2835_gpio_fsel(LCD_D6, BCM2835_GPIO_PUD_OFF);
- // bcm2835_gpio_fsel(LCD_D7, BCM2835_GPIO_PUD_OFF);
-
- // bcm2835_gpio_fsel(LCD_RS, BCM2835_GPIO_FSEL_INPT);
- // bcm2835_gpio_fsel(LCD_E, BCM2835_GPIO_FSEL_INPT);
- // bcm2835_gpio_fsel(LCD_D4, BCM2835_GPIO_FSEL_INPT);
- // bcm2835_gpio_fsel(LCD_D5, BCM2835_GPIO_FSEL_INPT);
- // bcm2835_gpio_fsel(LCD_D6, BCM2835_GPIO_FSEL_INPT);
- // bcm2835_gpio_fsel(LCD_D7, BCM2835_GPIO_FSEL_INPT);
-
- bcm2835_gpio_clr(LCD_RS);
- bcm2835_gpio_clr(LCD_E);
- bcm2835_gpio_clr(LCD_D4);
- bcm2835_gpio_clr(LCD_D5);
- bcm2835_gpio_clr(LCD_D6);
- bcm2835_gpio_clr(LCD_D7);
-}
generated by cgit v1.3.1 (git 2.54.0) at 2026-08-30 22:34:18 +0000