samples: gpio: lcd: sample app for HD44780 LCD controller
Display text strings on parallel interfacing HD44780 based
generic LCD controller using GPIO pins to interface with
Arduino Due(SAM3). HD44780 is a popular controller and an
example can help using gpio pins in parallel with it. I
have tested it on JHD20x4 LCD panel for 4Bits & 8Bits
configuration. The code has been made generic so that user
can modify quite a few options.
Datasheets:
http://lcd-linux.sourceforge.net/pdfdocs/hd44780.pdf
Signed-off-by: Milind Deore <tomdeore@gmail.com>
Change-Id: If2809222466b462fa2f4c42b14a514828530f082
This commit is contained in:
Milind Deore
Anas Nashif
parent
34f63de901
commit
7254f1d168
4 changed files with 620 additions and 0 deletions
5
samples/drivers/lcd_hd44780/Makefile
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5
samples/drivers/lcd_hd44780/Makefile
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KERNEL_TYPE = nano
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BOARD = arduino_due
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CONF_FILE = prj.conf
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include ${ZEPHYR_BASE}/Makefile.inc
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3
samples/drivers/lcd_hd44780/prj.conf
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3
samples/drivers/lcd_hd44780/prj.conf
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CONFIG_GPIO=y
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CONFIG_NANO_TIMERS=y
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CONFIG_NANO_TIMEOUTS=y
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1
samples/drivers/lcd_hd44780/src/Makefile
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1
samples/drivers/lcd_hd44780/src/Makefile
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@ -0,0 +1 @@
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obj-y = main.o
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611
samples/drivers/lcd_hd44780/src/main.c
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611
samples/drivers/lcd_hd44780/src/main.c
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@ -0,0 +1,611 @@
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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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* @file Display text strings on HD44780 based 20x4 LCD controller
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* using GPIO for parallel interface on Arduino Due.
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*
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* Datasheet: http://lcd-linux.sourceforge.net/pdfdocs/hd44780.pdf
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*
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* LCD Wiring
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* ----------
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*
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* The wiring for the LCD is as follows:
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* 1 : GND
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* 2 : 5V
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* 3 : Contrast (0-5V)*
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* 4 : RS (Register Select)
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* 5 : R/W (Read Write) - GROUND THIS PIN
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* 6 : Enable or Strobe
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* 7 : Data Bit 0 - NOT USED
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* 8 : Data Bit 1 - NOT USED
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* 9 : Data Bit 2 - NOT USED
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* 10: Data Bit 3 - NOT USED
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* 11: Data Bit 4
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* 12: Data Bit 5
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* 13: Data Bit 6
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* 14: Data Bit 7
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* 15: LCD Backlight +5V**
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* 16: LCD Backlight GND
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*
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*
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* Arduino Due
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* -----------
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*
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* On Arduino Due:
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* 1. IO_3 is PC28
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* 2. IO_5 is PC25
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* 3. IO_6 is PC24
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* 4. IO_7 is PC23
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* 5. IO_8 is PC22
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* 6. IO_9 is PC21
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*
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* The gpio_atmel_sam3 driver is being used.
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*
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* This sample app display text strings per line & page wise.
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*
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* Every 3 second you should see this repeatedly
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* on display:
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* "
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* *********************
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* Arduino Due
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* 20x4 LCD Display
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* *********************
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*
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* ------------------
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* - Zephyr Rocks!
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* - My super RTOS
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* ------------------
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*
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* --------HOME--------
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* I am home!
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*
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* --------------------
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*/
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#include <zephyr.h>
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#include <misc/printk.h>
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#include <gpio.h>
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#include <sys_clock.h>
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#include <string.h>
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#if defined(CONFIG_GPIO_ATMEL_SAM3)
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#define GPIO_DRV_NAME CONFIG_GPIO_ATMEL_SAM3_PORTC_DEV_NAME
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#else
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#error "Unsupported GPIO driver"
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#endif
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#if defined(CONFIG_SOC_ATMEL_SAM3)
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/* Define GPIO OUT to LCD */
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#define GPIO_PIN_PC12_D0 12 /* PC12 - pin 51 */
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#define GPIO_PIN_PC13_D1 13 /* PC13 - pin 50 */
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#define GPIO_PIN_PC14_D2 14 /* PC14 - pin 49 */
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#define GPIO_PIN_PC15_D3 15 /* PC15 - pin 48 */
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#define GPIO_PIN_PC24_D4 24 /* PC24 - pin 6 */
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#define GPIO_PIN_PC23_D5 23 /* PC23 - pin 7 */
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#define GPIO_PIN_PC22_D6 22 /* PC22 - pin 8 */
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#define GPIO_PIN_PC21_D7 21 /* PC21 - pin 9 */
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#define GPIO_PIN_PC28_RS 28 /* PC28 - pin 3 */
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#define GPIO_PIN_PC25_E 25 /* PC25 - pin 5 */
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#define GPIO_NAME "GPIO_"
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#endif
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/* Commands */
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#define LCD_CLEAR_DISPLAY 0x01
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#define LCD_RETURN_HOME 0x02
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#define LCD_ENTRY_MODE_SET 0x04
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#define LCD_DISPLAY_CONTROL 0x08
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#define LCD_CURSOR_SHIFT 0x10
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#define LCD_FUNCTION_SET 0x20
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#define LCD_SET_CGRAM_ADDR 0x40
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#define LCD_SET_DDRAM_ADDR 0x80
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/* Display entry mode */
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#define LCD_ENTRY_RIGHT 0x00
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#define LCD_ENTRY_LEFT 0x02
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#define LCD_ENTRY_SHIFT_INCREMENT 0x01
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#define LCD_ENTRY_SHIFT_DECREMENT 0x00
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/* Display on/off control */
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#define LCD_DISPLAY_ON 0x04
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#define LCD_DISPLAY_OFF 0x00
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#define LCD_CURSOR_ON 0x02
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#define LCD_CURSOR_OFF 0x00
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#define LCD_BLINK_ON 0x01
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#define LCD_BLINK_OFF 0x00
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/* Display/cursor shift */
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#define LCD_DISPLAY_MOVE 0x08
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#define LCD_CURSOR_MOVE 0x00
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#define LCD_MOVE_RIGHT 0x04
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#define LCD_MOVE_LEFT 0x00
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/* Function set */
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#define LCD_8BIT_MODE 0x10
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#define LCD_4BIT_MODE 0x00
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#define LCD_2_LINE 0x08
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#define LCD_1_LINE 0x00
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#define LCD_5x10_DOTS 0x04
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#define LCD_5x8_DOTS 0x00
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/* Define some device constants */
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#define LCD_WIDTH 20 /* Max char per line */
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#define HIGH 1
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#define LOW 0
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#define ENABLE_DELAY 0.0100
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#define GPIO_PIN_WR(dev, pin, bit) \
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do { \
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if (gpio_pin_write((dev), (pin), (bit))) { \
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printk("Err set " GPIO_NAME "%d! %x\n", (pin), (bit)); \
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} \
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} while (0) \
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#define GPIO_PIN_CFG(dev, pin, dir) \
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do { \
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if (gpio_pin_configure((dev), (pin), (dir))) { \
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printk("Err cfg " GPIO_NAME "%d! %x\n", (pin), (dir)); \
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} \
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} while (0)
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struct pi_lcd_data {
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uint8_t disp_func; /* Display Function */
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uint8_t disp_cntl; /* Display Control */
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uint8_t disp_mode; /* Display Mode */
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uint8_t cfg_rows;
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uint8_t row_offsets[4];
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};
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/* Default Configuration - User can update */
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struct pi_lcd_data lcd_data = {
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.disp_func = LCD_4BIT_MODE | LCD_1_LINE | LCD_5x8_DOTS,
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.disp_cntl = 0,
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.disp_mode = 0,
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.cfg_rows = 0,
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.row_offsets = {0x00, 0x00, 0x00, 0x00}
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};
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void _set_row_offsets(int8_t row0, int8_t row1, int8_t row2, int8_t row3)
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{
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lcd_data.row_offsets[0] = row0;
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lcd_data.row_offsets[1] = row1;
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lcd_data.row_offsets[2] = row2;
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lcd_data.row_offsets[3] = row3;
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}
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void _pi_lcd_toggle_enable(struct device *gpio_dev)
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{
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC25_E, LOW);
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task_sleep(SECONDS(ENABLE_DELAY));
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC25_E, HIGH);
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task_sleep(SECONDS(ENABLE_DELAY));
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC25_E, LOW);
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task_sleep(SECONDS(ENABLE_DELAY));
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}
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void _pi_lcd_4bits_wr(struct device *gpio_dev, uint8_t bits)
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{
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/* High bits */
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC24_D4, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC23_D5, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC22_D6, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC21_D7, LOW);
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if ((bits & BIT(4)) == BIT(4)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC24_D4, HIGH);
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}
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if ((bits & BIT(5)) == BIT(5)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC23_D5, HIGH);
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}
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if ((bits & BIT(6)) == BIT(6)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC22_D6, HIGH);
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}
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if ((bits & BIT(7)) == BIT(7)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC21_D7, HIGH);
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}
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/* Toggle 'Enable' pin */
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_pi_lcd_toggle_enable(gpio_dev);
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/* Low bits */
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC24_D4, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC23_D5, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC22_D6, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC21_D7, LOW);
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if ((bits & BIT(0)) == BIT(0)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC24_D4, HIGH);
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}
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if ((bits & BIT(1)) == BIT(1)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC23_D5, HIGH);
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}
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if ((bits & BIT(2)) == BIT(2)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC22_D6, HIGH);
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}
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if ((bits & BIT(3)) == BIT(3)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC21_D7, HIGH);
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}
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/* Toggle 'Enable' pin */
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_pi_lcd_toggle_enable(gpio_dev);
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}
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void _pi_lcd_8bits_wr(struct device *gpio_dev, uint8_t bits)
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{
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/* High bits */
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC21_D7, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC22_D6, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC23_D5, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC24_D4, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC15_D3, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC14_D2, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC13_D1, LOW);
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC12_D0, LOW);
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/* Low bits */
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if ((bits & BIT(0)) == BIT(0)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC12_D0, HIGH);
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}
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if ((bits & BIT(1)) == BIT(1)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC13_D1, HIGH);
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}
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if ((bits & BIT(2)) == BIT(2)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC14_D2, HIGH);
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}
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if ((bits & BIT(3)) == BIT(3)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC15_D3, HIGH);
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}
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if ((bits & BIT(4)) == BIT(4)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC24_D4, HIGH);
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}
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if ((bits & BIT(5)) == BIT(5)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC23_D5, HIGH);
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}
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if ((bits & BIT(6)) == BIT(6)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC22_D6, HIGH);
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}
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if ((bits & BIT(7)) == BIT(7)) {
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC21_D7, HIGH);
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}
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/* Toggle 'Enable' pin */
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_pi_lcd_toggle_enable(gpio_dev);
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}
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void _pi_lcd_data(struct device *gpio_dev, uint8_t bits)
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{
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if (lcd_data.disp_func & LCD_8BIT_MODE) {
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_pi_lcd_8bits_wr(gpio_dev, bits);
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} else {
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_pi_lcd_4bits_wr(gpio_dev, bits);
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}
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}
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void _pi_lcd_command(struct device *gpio_dev, uint8_t bits)
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{
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/* mode = False for command */
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC28_RS, LOW);
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_pi_lcd_data(gpio_dev, bits);
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}
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void _pi_lcd_write(struct device *gpio_dev, uint8_t bits)
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{
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/* mode = True for character */
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GPIO_PIN_WR(gpio_dev, GPIO_PIN_PC28_RS, HIGH);
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_pi_lcd_data(gpio_dev, bits);
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}
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/*************************
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* USER can use these APIs
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*************************/
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/** Home */
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void pi_lcd_home(struct device *gpio_dev)
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{
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_pi_lcd_command(gpio_dev, LCD_RETURN_HOME);
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task_sleep(USEC(2000)); /* wait for 4.1ms */
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}
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/** Set curson position */
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void pi_lcd_set_cursor(struct device *gpio_dev, uint8_t col, uint8_t row)
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{
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size_t max_lines;
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max_lines = (sizeof(lcd_data.row_offsets) / sizeof(*lcd_data.row_offsets));
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if (row >= max_lines) {
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row = max_lines - 1; /* Count rows starting w/0 */
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}
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if (row >= lcd_data.cfg_rows) {
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row = lcd_data.cfg_rows - 1; /* Count rows starting w/0 */
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}
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_pi_lcd_command(gpio_dev, (LCD_SET_DDRAM_ADDR | (col + lcd_data.row_offsets[row])));
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}
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/** Clear display */
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void pi_lcd_clear(struct device *gpio_dev)
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{
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_pi_lcd_command(gpio_dev, LCD_CLEAR_DISPLAY);
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task_sleep(USEC(2000)); /* wait for 4.1ms */
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}
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/** Display ON */
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void pi_lcd_display_on(struct device *gpio_dev)
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{
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lcd_data.disp_cntl |= LCD_DISPLAY_ON;
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_pi_lcd_command(gpio_dev,
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LCD_DISPLAY_CONTROL | lcd_data.disp_cntl);
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}
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/** Display OFF */
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void pi_lcd_display_off(struct device *gpio_dev)
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{
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lcd_data.disp_cntl &= ~LCD_DISPLAY_ON;
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_pi_lcd_command(gpio_dev,
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LCD_DISPLAY_CONTROL | lcd_data.disp_cntl);
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}
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/** Turns cursor off */
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void pi_lcd_cursor_off(struct device *gpio_dev)
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{
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lcd_data.disp_cntl &= ~LCD_CURSOR_ON;
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_pi_lcd_command(gpio_dev,
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LCD_DISPLAY_CONTROL | lcd_data.disp_cntl);
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}
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/** Turn cursor on */
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void pi_lcd_cursor_on(struct device *gpio_dev)
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{
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lcd_data.disp_cntl |= LCD_CURSOR_ON;
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_pi_lcd_command(gpio_dev,
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LCD_DISPLAY_CONTROL | lcd_data.disp_cntl);
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}
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/** Turn off the blinking cursor */
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void pi_lcd_blink_off(struct device *gpio_dev)
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{
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lcd_data.disp_cntl &= ~LCD_BLINK_ON;
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_pi_lcd_command(gpio_dev,
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LCD_DISPLAY_CONTROL | lcd_data.disp_cntl);
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}
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/** Turn on the blinking cursor */
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void pi_lcd_blink_on(struct device *gpio_dev)
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{
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lcd_data.disp_cntl |= LCD_BLINK_ON;
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_pi_lcd_command(gpio_dev,
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LCD_DISPLAY_CONTROL | lcd_data.disp_cntl);
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}
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/** Scroll the display left without changing the RAM */
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void pi_lcd_scroll_left(struct device *gpio_dev)
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{
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_pi_lcd_command(gpio_dev, LCD_CURSOR_SHIFT |
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LCD_DISPLAY_MOVE | LCD_MOVE_LEFT);
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}
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/** Scroll the display right without changing the RAM */
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void pi_lcd_scroll_right(struct device *gpio_dev)
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{
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_pi_lcd_command(gpio_dev, LCD_CURSOR_SHIFT |
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LCD_DISPLAY_MOVE | LCD_MOVE_RIGHT);
|
||||
}
|
||||
|
||||
/** Text that flows from left to right */
|
||||
void pi_lcd_left_to_right(struct device *gpio_dev)
|
||||
{
|
||||
lcd_data.disp_mode |= LCD_ENTRY_LEFT;
|
||||
_pi_lcd_command(gpio_dev,
|
||||
LCD_ENTRY_MODE_SET | lcd_data.disp_cntl);
|
||||
}
|
||||
|
||||
/** Text that flows from right to left */
|
||||
void pi_lcd_right_to_left(struct device *gpio_dev)
|
||||
{
|
||||
lcd_data.disp_mode &= ~LCD_ENTRY_LEFT;
|
||||
_pi_lcd_command(gpio_dev,
|
||||
LCD_ENTRY_MODE_SET | lcd_data.disp_cntl);
|
||||
}
|
||||
|
||||
/** Right justify text from the cursor location */
|
||||
void pi_lcd_auto_scroll_right(struct device *gpio_dev)
|
||||
{
|
||||
lcd_data.disp_mode |= LCD_ENTRY_SHIFT_INCREMENT;
|
||||
_pi_lcd_command(gpio_dev,
|
||||
LCD_ENTRY_MODE_SET | lcd_data.disp_cntl);
|
||||
}
|
||||
|
||||
/** Left justify text from the cursor location */
|
||||
void pi_lcd_auto_scroll_left(struct device *gpio_dev)
|
||||
{
|
||||
lcd_data.disp_mode &= ~LCD_ENTRY_SHIFT_INCREMENT;
|
||||
_pi_lcd_command(gpio_dev,
|
||||
LCD_ENTRY_MODE_SET | lcd_data.disp_cntl);
|
||||
}
|
||||
|
||||
void pi_lcd_string(struct device *gpio_dev, char *msg)
|
||||
{
|
||||
int i;
|
||||
int len = 0;
|
||||
uint8_t data;
|
||||
|
||||
len = strlen(msg);
|
||||
if (len > LCD_WIDTH) {
|
||||
printk("Too long message! len %d %s\n", len, msg);
|
||||
}
|
||||
|
||||
for (i = 0; i < len; i++) {
|
||||
data = msg[i];
|
||||
_pi_lcd_write(gpio_dev, data);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/** LCD initialization function */
|
||||
void pi_lcd_init(struct device *gpio_dev, uint8_t cols, uint8_t rows, uint8_t dotsize)
|
||||
{
|
||||
if (rows > 1) {
|
||||
lcd_data.disp_func |= LCD_2_LINE;
|
||||
}
|
||||
lcd_data.cfg_rows = rows;
|
||||
|
||||
_set_row_offsets(0x00, 0x40, 0x00 + cols, 0x40 + cols);
|
||||
|
||||
/* For 1 line displays, a 10 pixel high font looks OK */
|
||||
if ((dotsize != LCD_5x8_DOTS) && (rows == 1)) {
|
||||
lcd_data.disp_func |= LCD_5x10_DOTS;
|
||||
}
|
||||
|
||||
/* SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
|
||||
* according to datasheet, we need at least 40ms after power rises
|
||||
* above 2.7V before sending commands. Arduino can turn on way
|
||||
* before 4.5V so we'll wait 50
|
||||
*/
|
||||
task_sleep(USEC(50000));
|
||||
|
||||
/* this is according to the hitachi HD44780 datasheet
|
||||
* figure 23/24, pg 45/46 try to set 4/8 bits mode
|
||||
*/
|
||||
if (lcd_data.disp_func & LCD_8BIT_MODE) {
|
||||
/* 1st try */
|
||||
_pi_lcd_command(gpio_dev, 0x30);
|
||||
task_sleep(USEC(4500)); /* wait for 4.1ms */
|
||||
|
||||
/* 2nd try */
|
||||
_pi_lcd_command(gpio_dev, 0x30);
|
||||
task_sleep(USEC(4500)); /* wait for 4.1ms */
|
||||
|
||||
/* 3rd try */
|
||||
_pi_lcd_command(gpio_dev, 0x30);
|
||||
task_sleep(USEC(150)); /* wait for 100us */
|
||||
|
||||
/* Set 4bit interface */
|
||||
_pi_lcd_command(gpio_dev, 0x30);
|
||||
} else {
|
||||
/* 1st try */
|
||||
_pi_lcd_command(gpio_dev, 0x03);
|
||||
task_sleep(USEC(4500)); /* wait for 4.1ms */
|
||||
|
||||
/* 2nd try */
|
||||
_pi_lcd_command(gpio_dev, 0x03);
|
||||
task_sleep(USEC(4500)); /* wait for 4.1ms */
|
||||
|
||||
/* 3rd try */
|
||||
_pi_lcd_command(gpio_dev, 0x03);
|
||||
task_sleep(USEC(150)); /* wait for 100us */
|
||||
|
||||
/* Set 4bit interface */
|
||||
_pi_lcd_command(gpio_dev, 0x02);
|
||||
}
|
||||
|
||||
/* finally, set # lines, font size, etc. */
|
||||
_pi_lcd_command(gpio_dev, (LCD_FUNCTION_SET | lcd_data.disp_func));
|
||||
|
||||
/* turn the display on with no cursor or blinking default */
|
||||
lcd_data.disp_cntl = LCD_DISPLAY_ON | LCD_CURSOR_OFF | LCD_BLINK_OFF;
|
||||
pi_lcd_display_on(gpio_dev);
|
||||
|
||||
/* clear it off */
|
||||
pi_lcd_clear(gpio_dev);
|
||||
|
||||
/* Initialize to default text direction */
|
||||
lcd_data.disp_mode = LCD_ENTRY_LEFT | LCD_ENTRY_SHIFT_DECREMENT;
|
||||
/* set the entry mode */
|
||||
_pi_lcd_command(gpio_dev, LCD_ENTRY_MODE_SET | lcd_data.disp_mode);
|
||||
}
|
||||
|
||||
void main(void)
|
||||
{
|
||||
struct device *gpio_dev;
|
||||
|
||||
gpio_dev = device_get_binding(GPIO_DRV_NAME);
|
||||
if (!gpio_dev) {
|
||||
printk("Cannot find %s!\n", GPIO_DRV_NAME);
|
||||
}
|
||||
|
||||
/* Setup GPIO output */
|
||||
GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC25_E, GPIO_DIR_OUT);
|
||||
GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC28_RS, GPIO_DIR_OUT);
|
||||
GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC12_D0, GPIO_DIR_OUT);
|
||||
GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC13_D1, GPIO_DIR_OUT);
|
||||
GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC14_D2, GPIO_DIR_OUT);
|
||||
GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC15_D3, GPIO_DIR_OUT);
|
||||
GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC24_D4, GPIO_DIR_OUT);
|
||||
GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC23_D5, GPIO_DIR_OUT);
|
||||
GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC22_D6, GPIO_DIR_OUT);
|
||||
GPIO_PIN_CFG(gpio_dev, GPIO_PIN_PC21_D7, GPIO_DIR_OUT);
|
||||
|
||||
printk("LCD Init\n");
|
||||
pi_lcd_init(gpio_dev, 20, 4, LCD_5x8_DOTS);
|
||||
|
||||
/* Clear display */
|
||||
pi_lcd_clear(gpio_dev);
|
||||
|
||||
while (1) {
|
||||
printk("Page 1: message\n");
|
||||
|
||||
pi_lcd_string(gpio_dev, "********************");
|
||||
pi_lcd_set_cursor(gpio_dev, 0, 1);
|
||||
pi_lcd_string(gpio_dev, "Arduino Due");
|
||||
pi_lcd_right_to_left(gpio_dev);
|
||||
pi_lcd_set_cursor(gpio_dev, 15, 2);
|
||||
pi_lcd_string(gpio_dev, "yalpsiD DCL 4x02");
|
||||
pi_lcd_set_cursor(gpio_dev, 19, 3);
|
||||
pi_lcd_left_to_right(gpio_dev);
|
||||
pi_lcd_string(gpio_dev, "********************");
|
||||
task_sleep(SECONDS(3));
|
||||
|
||||
/* Clear display */
|
||||
pi_lcd_clear(gpio_dev);
|
||||
|
||||
printk("Page 2: message\n");
|
||||
|
||||
pi_lcd_scroll_right(gpio_dev);
|
||||
pi_lcd_string(gpio_dev, "-------------------");
|
||||
pi_lcd_set_cursor(gpio_dev, 0, 1);
|
||||
pi_lcd_scroll_right(gpio_dev);
|
||||
pi_lcd_string(gpio_dev, "Zephyr Rocks!");
|
||||
pi_lcd_set_cursor(gpio_dev, 0, 2);
|
||||
pi_lcd_string(gpio_dev, "My super RTOS");
|
||||
pi_lcd_set_cursor(gpio_dev, 0, 3);
|
||||
pi_lcd_string(gpio_dev, "-------------------");
|
||||
task_sleep(SECONDS(3));
|
||||
|
||||
/* Clear display */
|
||||
pi_lcd_clear(gpio_dev);
|
||||
|
||||
printk("Page 3: message\n");
|
||||
|
||||
pi_lcd_set_cursor(gpio_dev, 0, 3);
|
||||
pi_lcd_string(gpio_dev, "--------------------");
|
||||
pi_lcd_home(gpio_dev);
|
||||
pi_lcd_string(gpio_dev, "--------HOME--------");
|
||||
pi_lcd_set_cursor(gpio_dev, 0, 1);
|
||||
pi_lcd_string(gpio_dev, "I am home!");
|
||||
pi_lcd_set_cursor(gpio_dev, 0, 2);
|
||||
pi_lcd_string(gpio_dev, "");
|
||||
task_sleep(SECONDS(3));
|
||||
|
||||
/* Clear display */
|
||||
pi_lcd_clear(gpio_dev);
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue