Diff: LCD.cpp

Revision:

0:4fbfa76a5bdb

Child:

1:707fccd6c949

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LCD.cpp	Sun Feb 28 03:26:28 2021 +0000
@@ -0,0 +1,87 @@
+#include "mbed.h"
+#include "LCD.h"
+#include <string>
+
+//Code for Newhaven NHD‐0216K3Z‐FL‐GBW LCD interfaced to FRDM-K64F via I2C
+LCD::LCD() : i2c(PIN_SCL, PIN_SDA){
+    LCD_init();
+}
+
+void LCD::LCD_init(void) {
+    
+    //LCD Initiations---------------------------------------
+
+    i2c.frequency(LCD_FREQ); //Corresponds to 50KHz    
+    
+    char cmd[3]; 
+  
+    cmd[0] = 0xFE; //For all cases
+        
+        cmd[1] = 0x52;
+        cmd[2] = 40;        //contrast 1 - 50 
+        i2c.write(addr, cmd, 3);
+        
+        cmd[1] = 0x53;
+        cmd[2] = 8;        //Backlight 1-8
+        i2c.write(addr, cmd, 3);
+               
+        cmd[1] = 0x48;
+        i2c.write(addr, cmd, 2); //Underline cursor off
+        
+        cmd[1] = 0x46;
+        i2c.write(addr, cmd, 2); //Cursor Home 
+    
+} //END LCD_init
+
+
+void LCD::clearLCD(void) {
+    
+    char cmd[3];
+    cmd[0] = 0xFE;
+    wait_us(100);
+    
+    cmd[1] = 0x51;
+    i2c.write(addr, cmd, 2); //clear current display 
+    
+    cmd[1] = 0x46;
+    i2c.write(addr, cmd, 2); //Cursor Home 
+     
+} //END clearLCD
+
+
+void LCD::LCD_display(string topLine, string bottomLine) {
+    
+    char cmd[] = "                "; //Long enough to send a complete line of text
+
+
+    clearLCD(); //Clear before display
+
+    wait_us(LCD_DELAY); //Short Delay 
+
+    int i;
+  
+    for(i=0;(i<16 && i < topLine.length());i++) { //Display top line
+        cmd[i]=topLine[i];
+    }
+    i2c.write(addr,cmd,16);
+       
+    cmd[0] = 0xFE; //Since it was overwritten above    
+    cmd[1] = 0x45;
+    cmd[2] = 0x40;        //LCD Cursor to next line 
+    i2c.write(addr, cmd, 3);
+       
+    wait_us(LCD_DELAY); //Delay between writing lines
+        
+    for(i=0;(i<16 && i < topLine.length());i++) { //Display bottom line
+        cmd[i]=bottomLine[i];
+    }
+    i2c.write(addr,cmd,16);  
+    cmd[0] = 0xFE; //Since it was overwritten above  
+   
+ } //END LCD_display  
+
+ 
+     
+ 
+     
+