Diff: Display1602/Display1602.cpp

Revision:

0:a5367bd4e404

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Display1602/Display1602.cpp	Tue May 20 15:11:16 2014 +0000
@@ -0,0 +1,91 @@
+
+#include "Display1602.h"
+
+ Display1602::Display1602(PinName registerSelect,PinName readWriteSelect,PinName readWriteEnable,PinName d0,PinName d1,PinName d2,PinName d3,PinName d4,PinName d5,PinName d6,PinName d7) 
+        : rs(registerSelect), rw(readWriteSelect), e(readWriteEnable), data(d0,d1,d2,d3,d4,d5,d6,d7)
+{
+    //To ensure we have waited 15ms after power up and VDD > 4.5v (don't know how to test VDD)
+    wait_ms(20);
+    
+    //The init commands always sent using the 4bit interface.
+    e = true;
+    
+    //Set interface to 8 bit mode
+    SendCommand(0x38);
+    wait_ms(1); 
+    
+    //Display off
+    SendCommand(0x08);
+    wait_ms(1); 
+    
+    Clear();
+    
+    //Set the display to 2 line and 5x11 font.
+    SendCommand(0x06);
+    wait_ms(1); 
+    
+    //Init done, turn display on.
+    SendCommand(0x0c); //No with no cursor.
+    wait_ms(10);   
+}
+
+void Display1602::Clear()
+{
+    SendCommand(0x01);
+    wait_ms(2);//Docs say have to wait more than 1.53 milliseconds after clearing display.
+}
+
+void Display1602::Print(const char *text)
+{
+    int n = 16;
+    while (*text && n--)
+    {
+        SendChar(*text);
+        text++;
+    }
+}
+
+void Display1602::printf(const char *format,...)
+{
+    va_list args;
+    char buf[17];
+
+    va_start(args, format);
+    vsnprintf(buf,17,format, args);
+    va_end(args);
+    
+    Print(buf);        
+}
+
+void Display1602::SetXY(int x,int y)
+{
+    if (y == 0)
+    {
+        SendCommand (0x80 | x);
+    }
+    else
+    {
+        SendCommand (0xC0 | x);
+    }
+}
+    
+void Display1602::SendCommand(int cmd)
+{
+    rs = false;//read register
+    rw = false;//Write mode
+    e = true;
+    data = cmd;
+    wait_us(40);//Have to wait this time before we then drop the e line. Data sent on rising edge so has to be dropped.
+    e = false;
+}
+
+void Display1602::SendChar(char c)
+{
+    rs = true;//Writing data.
+    rw = false;//Write mode
+    e = true;
+    data = c;
+    wait_us(40);//Have to wait this time before we then drop the e line. Data sent on rising edge so has to be dropped.
+    e = false;
+}
+    
\ No newline at end of file