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00001 /* 00002 * ---------------------------------------------------------------------------- 00003 * "THE BEER-WARE LICENSE" (Revision 42): 00004 * <joerg@FreeBSD.ORG> wrote this file. As long as you retain this notice you 00005 * can do whatever you want with this stuff. If we meet some day, and you think 00006 * this stuff is worth it, you can buy me a beer in return. Joerg Wunsch 00007 * ---------------------------------------------------------------------------- 00008 * 00009 * HD44780 LCD display driver 00010 * 00011 * $Id: hd44780.h 2002 2009-06-25 20:21:16Z joerg_wunsch $ 00012 */ 00013 00014 /* 00015 * Send byte b to the LCD. rs is the RS signal (register select), 0 00016 * selects instruction register, 1 selects the data register. 00017 */ 00018 void hd44780_outbyte(uint8_t b, uint8_t rs); 00019 00020 /* 00021 * Read one byte from the LCD controller. rs is the RS signal, 0 00022 * selects busy flag (bit 7) and address counter, 1 selects the data 00023 * register. 00024 */ 00025 uint8_t hd44780_inbyte(uint8_t rs); 00026 00027 /* 00028 * Wait for the busy flag to clear. 00029 */ 00030 void hd44780_wait_ready(bool islong); 00031 00032 /* 00033 * Initialize the LCD controller hardware. 00034 */ 00035 void hd44780_init(void); 00036 00037 /* 00038 * Prepare the LCD controller pins for powerdown. 00039 */ 00040 void hd44780_powerdown(void); 00041 00042 00043 /* Send a command to the LCD controller. */ 00044 #define hd44780_outcmd(n) hd44780_outbyte((n), 0) 00045 00046 /* Send a data byte to the LCD controller. */ 00047 #define hd44780_outdata(n) hd44780_outbyte((n), 1) 00048 00049 /* Read the address counter and busy flag from the LCD. */ 00050 #define hd44780_incmd() hd44780_inbyte(0) 00051 00052 /* Read the current data byte from the LCD. */ 00053 #define hd44780_indata() hd44780_inbyte(1) 00054 00055 00056 /* Clear LCD display command. */ 00057 #define HD44780_CLR \ 00058 0x01 00059 00060 /* Home cursor command. */ 00061 #define HD44780_HOME \ 00062 0x02 00063 00064 /* 00065 * Select the entry mode. inc determines whether the address counter 00066 * auto-increments, shift selects an automatic display shift. 00067 */ 00068 #define HD44780_ENTMODE(inc, shift) \ 00069 (0x04 | ((inc)? 0x02: 0) | ((shift)? 1: 0)) 00070 00071 /* 00072 * Selects disp[lay] on/off, cursor on/off, cursor blink[ing] 00073 * on/off. 00074 */ 00075 #define HD44780_DISPCTL(disp, cursor, blink) \ 00076 (0x08 | ((disp)? 0x04: 0) | ((cursor)? 0x02: 0) | ((blink)? 1: 0)) 00077 00078 /* 00079 * With shift = 1, shift display right or left. 00080 * With shift = 0, move cursor right or left. 00081 */ 00082 #define HD44780_SHIFT(shift, right) \ 00083 (0x10 | ((shift)? 0x08: 0) | ((right)? 0x04: 0)) 00084 00085 /* 00086 * Function set. if8bit selects an 8-bit data path, twoline arranges 00087 * for a two-line display, font5x10 selects the 5x10 dot font (5x8 00088 * dots if clear). 00089 */ 00090 #define HD44780_FNSET(if8bit, twoline, font5x10) \ 00091 (0x20 | ((if8bit)? 0x10: 0) | ((twoline)? 0x08: 0) | \ 00092 ((font5x10)? 0x04: 0)) 00093 00094 /* 00095 * Set the next character generator address to addr. 00096 */ 00097 #define HD44780_CGADDR(addr) \ 00098 (0x40 | ((addr) & 0x3f)) 00099 00100 /* 00101 * Set the next display address to addr. 00102 */ 00103 #define HD44780_DDADDR(addr) \ 00104 (0x80 | ((addr) & 0x7f)) 00105