Diff: 1wire_lcd.cpp

Revision:

0:9245c05647c9

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/1wire_lcd.cpp	Tue Feb 22 10:41:38 2011 +0000
@@ -0,0 +1,116 @@
+#include "1wire_lcd.h"
+#include "mbed.h"
+
+DigitalOut wire(p21);
+
+
+void one_wire(unsigned char data)
+{
+    char i;
+    wire=1;
+    for(i=0;i < 8;i++)
+    {
+        if((data<<(i))&0x80)
+        {
+            wire=0;
+            wire=1;
+        }
+        else
+        {
+            wire=0;
+            wait_us(15);
+            wire=1;
+            wait_us(30);
+        }
+    }
+    wire=0;
+    wait_us(210);
+    wire=1;
+    wait_us(300);
+}
+
+
+void lcd_putc(unsigned char c)
+{
+   unsigned char data;
+    data = 0x00;
+    data |=0x50;
+    one_wire(data);
+    data |= ((c & 0xF0)>>4);
+    one_wire(data);
+    data &= 0x1F;
+    one_wire(data);
+    wait_us(100);
+    
+    data = 0x00;
+    data |= 0x50;
+    one_wire(data);
+    data |= (((c & 0x0F) << 4) >> 4);
+    one_wire(data);
+    data &= 0x1F;
+    one_wire(data);
+    wait_us(100);
+
+}
+
+void lcd_command(unsigned char c)
+{
+   unsigned char data;
+    data = 0x00;
+    data |=0x40;
+    one_wire(data);
+    data |= ((c & 0xF0)>>4);
+    one_wire(data);
+    data &= 0x0F;
+    one_wire(data);
+    wait_us(100);
+    
+    data = 0x00;
+    data |= 0x40;
+    one_wire(data);
+    data |= (((c & 0x0F) << 4) >> 4);
+    one_wire(data);
+    data &= 0x0F;
+    one_wire(data);
+    wait_us(100);
+
+}
+
+void lcd_clear(void)
+{
+    lcd_command(0x1);
+    wait_ms(2);
+}
+
+void lcd_position(unsigned char x,unsigned char y)
+{
+    if(x==1)
+        lcd_command(0x80+((y-1)%20));
+    else
+        lcd_command(0xC0+((y-1)%20));
+}
+
+void lcd_printf(const char * a)
+{
+    wait_us(100);
+    while(*a)
+        lcd_putc(*a++);
+}
+
+void lcd_init()
+{
+    one_wire(0);
+    wait_ms(15);
+    lcd_command(0x02);
+    wait_ms(2);
+    lcd_command(40);    //2line 4bit
+    lcd_command(6);     //write right
+    lcd_command(12);    //pointer hidden
+    lcd_clear();
+
+
+    lcd_command(128);   //first line
+
+}
+
+