Wire LCD as Follows:
| LCD PIN | GPIO PIN | Pi PIN |
|---|---|---|
| LCD RS | GPIO 17 | J8-11 |
| LCD E | GPIO 27 | J8-13 |
| DATA D4 | GPIO 6 | J8-31 |
| DATA D5 | GPIO 13 | J8-33 |
| DATA D6 | GPIO 19 | J8-35 |
| DATA D7 | GPIO 26 | J8-37 |
| +5V | +5V | J8-4 |
| GND | GND | J8-6 |
Build module: make
Insert module: sudo insmod lcd.ko
Build userspace program: gcc user_lcd.c -o user_lcd
Run userspace program: ./user_lcd command args
1: Init LCD
2: Clear LCD
3 string: Write to LCD
4: Turn Off LCD
5: Turn On LCD
6: Cursor 1st line
7: Cursor 2nd line
8: Test Locks