Lluis Nadal
Loads eight custom characters to LCD
Revision 0:639529b48adf, committed 2010-10-15
- Comitter:
- lnadal
- Date:
- Fri Oct 15 19:14:01 2010 +0000
- Commit message:
Changed in this revision
diff -r 000000000000 -r 639529b48adf TextLCD.lib --- /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
diff -r 000000000000 -r 639529b48adf main.cpp
--- /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
diff -r 000000000000 -r 639529b48adf mbed.bld --- /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