Lluis Nadal / Mbed 2 deprecated Lcd_Custom_Char

Loads eight custom characters to LCD

Dependencies:   mbed

Files at this revision

API Documentation at this revision

Revision 0:639529b48adf, committed 2010-10-15

Comitter:
lnadal
Date:
Fri Oct 15 19:14:01 2010 +0000
Commit message:

Changed in this revision

TextLCD.lib Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file
mbed.bld Show annotated file Show diff for this revision Revisions of this file 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD.lib	Fri Oct 15 19:14:01 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/simon/code/TextLCD/#44f34c09bd37

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Oct 15 19:14:01 2010 +0000
@@ -0,0 +1,97 @@
+
+/* Lcd_Custom_Char
+
+Author: Lluis Nadal.
+Date: 15th October 2010.
+
+Up to 8 characters can be programmed in CGRAM, but because CGRAM is a RAM, characters are lost
+on power off and must be reloaded on power on.
+Assuming 2x16 LCD with HD44780 Hitachi controller compatible.
+
+*/
+
+#include "mbed.h"
+#include "TextLCD.h"
+
+
+// Defines LCD connections.
+TextLCD lcd(p24, p26, p27, p28, p29, p30); // rs, e, d4, d5, d6, d7
+
+// Defines 8 custom characters.
+char custom_char[8][8] = {
+    {0x07,0x08,0x1F,0x08,0x1F,0x08,0x07,0x00}, // Euro sign.
+    {0x00,0x0E,0x11,0x11,0x11,0x0A,0x1B,0x00}, // Ohm sign.
+    {0x00,0x00,0x00,0x12,0x12,0x12,0x1C,0x10}, // Micro sign.
+    {0x00,0x00,0x1F,0x0A,0x0A,0x0A,0x0A,0x00}, // Pi sign.
+    {0x0C,0x12,0x12,0x0C,0x00,0x00,0x00,0x00}, // Degree sign.
+    {0x0E,0x04,0x0E,0x15,0x015,0x0E,0x04,0x0E},// Phi sign.
+    {0x04,0x0E,0x15,0x04,0x04,0x04,0x04,0x04}, // Arrow up.
+    {0x04,0x04,0x04,0x04,0x04,0x15,0x0E,0x04}  // Arrow down.
+};
+
+
+// Defines LCD bus to write data.
+BusOut Lcd_pins(p27, p28, p29, p30); // d4, d5, d6, d7
+
+DigitalOut rs_pin(p24); // LCD pin rs (register select.)
+DigitalOut e_pin(p26);  // LCD pin e (enable).
+
+
+// Because we use 4 bit LCD, data must be sent in two steps.
+void writePort(int value) {
+
+    Lcd_pins = value >> 4;  // Shifts 4 bit right.
+    wait(0.000040f); // Wait 40us.
+    e_pin = 0;
+    wait(0.000040f);
+    e_pin = 1;
+    Lcd_pins = value;
+    wait(0.000040f);
+    e_pin = 0;
+    wait(0.000040f);
+    e_pin = 1;
+}
+
+
+
+int main() {
+
+
+    lcd.cls();
+    lcd.printf("Loading...");
+    wait(2);
+
+
+    for (int j=0; j<8; j++) {
+
+        rs_pin = 0; // We send a command.
+
+        /* 0X40 is the initial CGRAM address. Because each character needs a total amount of 8 memory 
+        locations, we increment addres in 8 units after each character.
+        */
+        writePort(0x40+8*j);
+
+
+// Writes data.
+        rs_pin = 1; // We send data.
+
+
+        for (int i=0; i<8; i++) {
+            writePort(custom_char[j][i]);
+        }
+    }
+
+
+
+    lcd.cls();
+    wait(0.010);
+
+    lcd.printf("Custom character");
+    lcd.locate(0,1);
+
+// Prints loaded custom characters. ASCII codes 0 to 7.
+    for (int j=0; j<8; j++) {
+        lcd.putc(j);
+    }
+
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Fri Oct 15 19:14:01 2010 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e