| /* |
| * ---------------------------------------------------------------------------- |
| * "THE BEER-WARE LICENSE" (Revision 42): |
| * <joerg@FreeBSD.ORG> wrote this file. As long as you retain this notice you |
| * can do whatever you want with this stuff. If we meet some day, and you think |
| * this stuff is worth it, you can buy me a beer in return. Joerg Wunsch |
| * ---------------------------------------------------------------------------- |
| * |
| * HD44780 LCD display driver |
| * |
| * $Id: hd44780.h 2002 2009-06-25 20:21:16Z joerg_wunsch $ |
| */ |
| |
| /* |
| * Send byte b to the LCD. rs is the RS signal (register select), 0 |
| * selects instruction register, 1 selects the data register. |
| */ |
| void hd44780_outbyte(uint8_t b, uint8_t rs); |
| |
| /* |
| * Read one byte from the LCD controller. rs is the RS signal, 0 |
| * selects busy flag (bit 7) and address counter, 1 selects the data |
| * register. |
| */ |
| uint8_t hd44780_inbyte(uint8_t rs); |
| |
| /* |
| * Wait for the busy flag to clear. |
| */ |
| void hd44780_wait_ready(bool islong); |
| |
| /* |
| * Initialize the LCD controller hardware. |
| */ |
| void hd44780_init(void); |
| |
| /* |
| * Prepare the LCD controller pins for powerdown. |
| */ |
| void hd44780_powerdown(void); |
| |
| |
| /* Send a command to the LCD controller. */ |
| #define hd44780_outcmd(n) hd44780_outbyte((n), 0) |
| |
| /* Send a data byte to the LCD controller. */ |
| #define hd44780_outdata(n) hd44780_outbyte((n), 1) |
| |
| /* Read the address counter and busy flag from the LCD. */ |
| #define hd44780_incmd() hd44780_inbyte(0) |
| |
| /* Read the current data byte from the LCD. */ |
| #define hd44780_indata() hd44780_inbyte(1) |
| |
| |
| /* Clear LCD display command. */ |
| #define HD44780_CLR \ |
| 0x01 |
| |
| /* Home cursor command. */ |
| #define HD44780_HOME \ |
| 0x02 |
| |
| /* |
| * Select the entry mode. inc determines whether the address counter |
| * auto-increments, shift selects an automatic display shift. |
| */ |
| #define HD44780_ENTMODE(inc, shift) \ |
| (0x04 | ((inc)? 0x02: 0) | ((shift)? 1: 0)) |
| |
| /* |
| * Selects disp[lay] on/off, cursor on/off, cursor blink[ing] |
| * on/off. |
| */ |
| #define HD44780_DISPCTL(disp, cursor, blink) \ |
| (0x08 | ((disp)? 0x04: 0) | ((cursor)? 0x02: 0) | ((blink)? 1: 0)) |
| |
| /* |
| * With shift = 1, shift display right or left. |
| * With shift = 0, move cursor right or left. |
| */ |
| #define HD44780_SHIFT(shift, right) \ |
| (0x10 | ((shift)? 0x08: 0) | ((right)? 0x04: 0)) |
| |
| /* |
| * Function set. if8bit selects an 8-bit data path, twoline arranges |
| * for a two-line display, font5x10 selects the 5x10 dot font (5x8 |
| * dots if clear). |
| */ |
| #define HD44780_FNSET(if8bit, twoline, font5x10) \ |
| (0x20 | ((if8bit)? 0x10: 0) | ((twoline)? 0x08: 0) | \ |
| ((font5x10)? 0x04: 0)) |
| |
| /* |
| * Set the next character generator address to addr. |
| */ |
| #define HD44780_CGADDR(addr) \ |
| (0x40 | ((addr) & 0x3f)) |
| |
| /* |
| * Set the next display address to addr. |
| */ |
| #define HD44780_DDADDR(addr) \ |
| (0x80 | ((addr) & 0x7f)) |
| |
