Marjan Hanc / LCD_DOGM204

Library for the I2C connected LCD display EA DOGM204.

Example use of the LCD library.

main.cpp

include "mbed.h"
#include "lcd_DOGM204_i2c.h"

DOGM204I2C  lcd(P0_0, P0_1, 0, 100000);

int main() {

    lcd.init();  // Initialize display
    lcd.cls();   // Clear display

    lcd.display_set(DOGM204I2C::LCD_DISPLAY_ON);  // optional | LCD_CURSOR_ON | LCD_BLINK_ON

    lcd.set_pos(DOGM204I2C::LCD_LINE1);
    lcd.write((char *)"*** Hello world *** ");

    lcd.set_pos(DOGM204I2C::LCD_LINE2);
    lcd.write((char *)"01234567890123456789");

    lcd.set_pos(DOGM204I2C::LCD_LINE3);
    lcd.write((char *)"ABCDEFGHIJKLMNOPQRST");

    lcd.set_pos(DOGM204I2C::LCD_LINE4);
    lcd.write((char *)"abcdefghijklmnopqrst");

}

Diff: lcd_DOGM204_i2c.h

Revision:
0:ee339d42b34d
diff -r 000000000000 -r ee339d42b34d lcd_DOGM204_i2c.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lcd_DOGM204_i2c.h	Thu Jan 02 16:20:12 2020 +0000
@@ -0,0 +1,96 @@
+/** EA DOGM204 LCD header file
+ *
+ * Provides access to the I2C connected Electronic Assembly DOGM204 LCD display
+ * with SSD1803A controller (www.lcd-module.de)
+ *
+ * Version: 1.00.000
+ * Date :   02.01.2020
+ * Author:  Marjan Hanc, www.m-hub.eu
+ *
+ * Note: This library does not support SPI and 4/8-Bit I/O modes of display.
+ *      It is assumed, that the RS address selection pin is statically connected
+ *      either to the GND (SA0=0) or VCC (SA0=1).
+ **/
+
+#ifndef MBED_LCD_DOGM204
+#define MBED_LCD_DOGM204
+
+#include "mbed.h"
+
+class DOGM204I2C {
+
+    public:
+
+        enum LCD_Commands {
+            LCD_ADR    = 0x78,  // SA0=0, 0x7A when SA0=1
+            LCD_CLEAR  = 0x00,  // Clear Display
+            LCD_RTHOME = 0x02   // Return home
+        };
+
+        enum LCD_Status {
+            LCD_STATUS = 0x00,
+            LCD_DATA   = 0x40,
+            LCD_BUSY   = 0x80
+        };
+
+        enum LCD_Charset {
+            LCD_ROMA = 0x00,
+            LCD_ROMB = 0x04,
+            LCD_ROMC = 0x0C
+        };
+
+        enum LCD_Mode {
+            LCD_CURSOR_LINE  = 0x00,
+            LCD_CURSOR_BLOCK = 0x02,
+            LCD_TOPVIEW      = 0x05,
+            LCD_BOTVIEW      = 0x06,
+            LCD_2LINE_MODE   = 0x08, // Base setting for 1 & 2 line mode
+            LCD_4LINE_MODE   = 0x09, // Base setting for 3 & 4 line mode
+            LCD_FONT_5DOT    = 0x00,
+            LCD_FONT_6DOT    = 0x04
+        };
+
+        enum LCD_Settings {
+            LCD_DISPLAY_ON  = 0x04,
+            LCD_DISPLAY_OFF = 0x03,
+            LCD_CURSOR_ON   = 0x02,
+            LCD_CURSOR_OFF  = 0x05,
+            LCD_BLINK_ON    = 0x01,
+            LCD_BLINK_OFF   = 0x06
+        };
+
+        enum LCD_Positions {
+            LCD_HOME  = 0x80,
+            LCD_LINE1 = 0x00,
+            LCD_LINE2 = 0x20,
+            LCD_LINE3 = 0x40,
+            LCD_LINE4 = 0x60
+        };
+
+        enum Frequency {
+            Frequency_100KHz = 100000,
+            Frequency_400KHz = 400000
+        };
+
+        DOGM204I2C(PinName sda, PinName scl, char SA, int frequency);
+
+        void display_set(char mode);
+        void set_pos(char pos);
+        void write_char(char line, char pos, char ch);
+        void write(char *s);
+        void cls();
+        void init();
+
+    private:
+        char _baseAdr;  // LCD base address (0x78 or 0x7A, depends on SA0)
+
+        I2C  i2c;  // I2C interface
+
+        bool lcd_i2c_write(char cmd, char dta);
+        char lcd_i2c_read(char cmd);
+        bool lcd_write_cmd(char data);
+        bool lcd_write_data(char data);
+};
+
+
+#endif