Dan East
TextLCD library for controlling various LCD panels based on the HD44780 4-bit interface. Includes support for custom character bitmaps.
Dependents: HD44780-LCD_with_Bluetooth
Fork of
TextLCD
by 
Simon Ford
Examples
Hello world in custom font
#include "mbed.h"
#include "TextLCD.h"
int main() {
lcd=new TextLCD(D8, D9, D4, D5, D6, D7);
char c_H[]={0x1b,0x1b,0x1b,0x1f,0x1b,0x1b,0x1b,0x1b};
char c_e[]={0x0,0x0,0xe,0x1b,0x1f,0x18,0x18,0xf};
char c_l[]={0x6,0x6,0x6,0x6,0x6,0x6,0x6,0x6};
char c_o[]={0x0,0x0,0xe,0x1b,0x1b,0x1b,0x1b,0xe};
char c_W[]={0x1b,0x1b,0x1b,0x1b,0x1f,0x1f,0x1f,0x1b};
char c_r[]={0x0,0x0,0xe,0x1b,0x18,0x18,0x18,0x18};
char c_d[]={0x3,0x3,0xf,0x1b,0x1b,0x1b,0x1b,0xf};
lcd->defineChar(1, c_H);
lcd->putc(1);
lcd->defineChar(2, c_e);
lcd->putc(2);
lcd->defineChar(3, c_l);
lcd->putc(3);
lcd->putc(3);
lcd->defineChar(4, c_o);
lcd->putc(4);
lcd->putc(32);
lcd->defineChar(5, c_W);
lcd->putc(5);
lcd->putc(4);
lcd->defineChar(6, c_r);
lcd->putc(6);
lcd->putc(3);
lcd->defineChar(7, c_d);
lcd->putc(7);
while (1) {
}
}
Animated busy indicator
This animation only uses 1 of the 8 custom character slots, and can be used like a regular character in the output and will automatically animate in-place. Any number of the animated characters can be displayed on the display at once using this animation technique.
#include "mbed.h"
#include "TextLCD.h"
int main() {
lcd=new TextLCD(D8, D9, D4, D5, D6, D7);
//The 7 animation characters
char spin[]={ 0x4,0x4,0x4,0x4,0x4,0x4,0x4,0x0,
0x2,0x2,0x2,0x4,0x8,0x8,0x8,0x0,
0x1,0x2,0x2,0x4,0x8,0x8,0x10,0x0,
0x0,0x0,0x3,0x4,0x18,0x0,0x0,0x0,
0x0,0x0,0x0,0x1f,0x0,0x0,0x0,0x0,
0x0,0x0,0x18,0x4,0x3,0x0,0x0,0x0,
0x10,0x8,0x8,0x4,0x2,0x2,0x01,0x0
};
//Output text.
lcd->printf("\1 Please wait \1");
//Animation loop
int frame=0;
while (1) {
lcd->defineChar(1, spin+frame*8);
frame=(frame+1)%(sizeof(spin)/8);
wait(.14);
}
main.cpp@1:ac48b187213c, 2010-05-27 (annotated)
- Committer:
- simon
- Date:
- Thu May 27 13:44:15 2010 +0000
- Revision:
- 1:ac48b187213c
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| simon | 1:ac48b187213c | 1 | // Write to all HD44780 TextLCD RAM locations, sford |
| simon | 1:ac48b187213c | 2 | // |
| simon | 1:ac48b187213c | 3 | // A quick hack to write to all the display RAM locations |
| simon | 1:ac48b187213c | 4 | // in an HD44780 display, to identify which location maps |
| simon | 1:ac48b187213c | 5 | // to which character. |
| simon | 1:ac48b187213c | 6 | // |
| simon | 1:ac48b187213c | 7 | // Instructions: |
| simon | 1:ac48b187213c | 8 | // - Change TextLCD pinout as appropriate so it works |
| simon | 1:ac48b187213c | 9 | // - Run, and it should fill the screen with characters |
| simon | 1:ac48b187213c | 10 | // - Identify what characters are at the start of each row |
| simon | 1:ac48b187213c | 11 | // |
| simon | 1:ac48b187213c | 12 | // To determine what address each line starts at, you subtract the |
| simon | 1:ac48b187213c | 13 | // ascii code for '0'(48) from the character at the start of each line |
| simon | 1:ac48b187213c | 14 | // - see http://www.asciitable.com/ |
| simon | 1:ac48b187213c | 15 | // |
| simon | 1:ac48b187213c | 16 | // e.g. |
| simon | 1:ac48b187213c | 17 | // +----------------+ |
| simon | 1:ac48b187213c | 18 | // |0123456789:;<=>?| first char = '0' (48) |
| simon | 1:ac48b187213c | 19 | // |XYZ.... | first char = 'X' (88) |
| simon | 1:ac48b187213c | 20 | // +----------------+ |
| simon | 1:ac48b187213c | 21 | // |
| simon | 1:ac48b187213c | 22 | // So in this case, the RAM offsets are 0 and 40 |
| simon | 1:ac48b187213c | 23 | |
| simon | 1:ac48b187213c | 24 | #include "mbed.h" |
| simon | 1:ac48b187213c | 25 | #include "TextLCD.h" |
| simon | 1:ac48b187213c | 26 | DigitalOut zero(p11); |
| simon | 1:ac48b187213c | 27 | TextLCD lcd(p10, p12, p15, p16, p29, p30, TextLCD::LCD16x2B); |
| simon | 1:ac48b187213c | 28 | |
| simon | 1:ac48b187213c | 29 | int main() { |
| simon | 1:ac48b187213c | 30 | lcd.printf("hithere"); |
| simon | 1:ac48b187213c | 31 | wait(1); |
| simon | 1:ac48b187213c | 32 | lcd.putc('i'); |
| simon | 1:ac48b187213c | 33 | wait(1); |
| simon | 1:ac48b187213c | 34 | lcd.cls(); |
| simon | 1:ac48b187213c | 35 | wait(1); |
| simon | 1:ac48b187213c | 36 | lcd.locate(4, 1); |
| simon | 1:ac48b187213c | 37 | wait(1); |
| simon | 1:ac48b187213c | 38 | lcd.printf("jdlkjfksj"); |
| simon | 1:ac48b187213c | 39 | for(int i=0; i<30; i++) { |
| simon | 1:ac48b187213c | 40 | lcd.putc('A' + i); |
| simon | 1:ac48b187213c | 41 | wait(0.3); |
| simon | 1:ac48b187213c | 42 | } |
| simon | 1:ac48b187213c | 43 | } |