Diff: lcd_P4bit.cpp

Revision:

0:b3e41ec91adf

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lcd_P4bit.cpp	Thu Aug 28 07:09:42 2014 +0000
@@ -0,0 +1,76 @@
+//
+// HD44780 type 4bit parallel LCD control
+//
+#include "mbed.h"
+
+DigitalOut LCDRS(P0_3);     // LCD module Register Select
+DigitalOut LCDE(P0_1);      // LCD module Enable
+DigitalOut LCDD4(P1_19);     // LCD data lines(4bit)
+DigitalOut LCDD5(P0_5);
+DigitalOut LCDD6(P0_4);
+DigitalOut LCDD7(P1_15);
+
+void enable( void )
+{
+  wait_us( 1 );
+  LCDE = 1;
+  wait_us( 1 );
+  LCDE = 0;
+  wait_us( 1 );
+}
+
+void lcd_set4bit( unsigned char d )
+{
+  LCDD4 = d & 0x01;
+  LCDD5 = d & 0x02;
+  LCDD6 = d & 0x04;
+  LCDD7 = d & 0x08;
+}
+
+void lcd_write4bit( unsigned char d )
+{
+  lcd_set4bit( d );
+  enable();
+}
+
+void LCD_cmd( char c )
+{
+  LCDRS = 0;
+  lcd_write4bit( c / 16 );
+  lcd_write4bit( c & 0x0f );
+  wait_us( 30 );
+}
+
+void LCD_data( char d )
+{
+  LCDRS = 1;
+  lcd_write4bit( d / 16 );
+  lcd_write4bit( d & 0x0f );
+  wait_us( 30 );
+}
+
+void LCD_puts( char *s )
+{
+  while( *s ) LCD_data( *s++ );
+}
+
+void LCD_iniz( void )
+{
+  LCDE = 0;
+  LCDRS = 0;
+  wait_ms( 40 );    // wait 40mS
+  lcd_write4bit( 0x03 );
+  wait_ms( 5 );
+  lcd_write4bit( 0x03 );
+  wait_ms( 2 );
+  lcd_write4bit( 0x03 );
+  wait_ms( 2 );
+  lcd_write4bit( 0x02 );    // 4bit interface select
+  LCD_cmd( 0x28 );      // 2 lines 5x8 chr.
+  LCD_cmd( 0x08 );      // display off
+  LCD_cmd( 0x01 );      // display clear
+  wait_ms( 2 );
+  LCD_cmd( 0x06 );      // entry mode
+  LCD_cmd( 0x0C );      // display on
+}
+