▼メーカー純正はちょっと入手は困難で特殊な2.54mmピッチの6ピンコネクタ（このタイプの10ピンはパーツ屋で良く見かけます）
//Chương trình Text LCD, Atmega644p
1: #include <avr/io.h> 2: #include <util/delay.h>3: /*Support _delay_ms(time) and _delay_us(time) function*/
4: 5: #define cbi(port, bit) (port)&=~(1<<(bit))
6: /*PORTの指定BITに１をセット*/
7: #define sbi(port, bit) (port)|=(1<<(bit))
8: /*PORTの指定BITにクリア*/
9: 10: #define RS 0
11: #define RW 1
12: #define EN 2
13: 14: #define ctrl PORTD
15: #define ddr_ctrl DDRD
16: #define data_out PORTD
17: #define data_in PIND
18: #define ddr_data DDRD
19: 20: void write_to_lcd(uint8_t chr) {
21: uint8_t hChar, lChar, temp_data; 22: 23: temp_data = data_out & 0x0F;//Doc 4 bit thap cua data_out de mask
24: 25: hChar = chr & 0xF0; 26: lChar = (chr<<4) & 0xF0; 27: 28: data_out = (hChar | temp_data);//Chu ly la phai xuat ky tu o bit cao truoc
29: sbi(ctrl, EN); //Can phai tao xung canh xuong moi lan xuat du lieu
30: cbi(ctrl, EN); //Hai dong nay nham tao xung canh xuong de biet xuat du lieu
31: 32: data_out = (lChar | temp_data); 33: sbi(ctrl, EN); 34: cbi(ctrl, EN); 35: } 36: 37: char read_from_lcd(void) {
38: char hChar, lChar;
39: 40: data_out |= 0xF0; 41: 42: sbi(ctrl, EN);43: ddr_data &= 0x0F;//Set 4 bit cao cua PORTD lam input
44: hChar = data_in & 0xF0; 45: cbi(ctrl, EN); 46: 47: sbi(ctrl, EN); 48: lChar = data_in & 0xF0; 49: cbi(ctrl, EN); 50: lChar >>=4; 51: 52: return (hChar|lChar);
53: } 54: 55: void wait_lcd(void) {
56: char temp_val;
57: 58: while(1) {
59: cbi(ctrl, RS);//RS=0; the following data is command
60: sbi(ctrl, RW);//LCD to AVR
61: 62: //Khi RS=0, RW=1, doc lu lieu D7->D0 tu LCD vao AVR de kiem tra xem LCD co ranh ko, BF=D7
63: temp_val = read_from_lcd();64: if(bit_is_clear(temp_val, 7)) break;
65: /*
66: Khi RW=1; du lieu se doc tu LCD ra ngoai.
67: De biet co the biet duoc LCD co ban hay ko, du dung co Busy Flag BF
68: Do LCD la mot thiet hoat dong tuong doi cham, so vo VDK, nen neu BF=1 thi phai doi cho xu ly xong nhiem vu hien tai.
69: Neu BF=0, co the xu ly tiep yeu cau lenh tiep theo.
70: */
71: }72: cbi(ctrl, RW);//ready for next step
73: ddr_data=0xFF;//ready to out
74: //Tiep theo co the ghi tu AVR->LCD
75: } 76: 77: void init_lcd(void) {
78: ddr_ctrl = 0xFF; 79: ddr_data = 0xFF;80: //La chan output, AVR->LCD, ghi D7->D0 la 0xFF
81: 82: cbi(ctrl, RS);//the following data is command
83: cbi(ctrl, RW);//AVR to LCD
84: cbi(ctrl, EN); 85: 86: sbi(ctrl, EN);//Muc dich la tao xung suon tac dong
87: 88: /*Khi vua khoi dong LCD thi mode 8 se duoc chon
89: LCD se co gang doc het cac chan tu D7:D0 de lay du lieu
90: Neu D3:D0 khong duoc ket noi voi AVR, viec doc lan dau tien co the dan den sai so
91: De su dung mode 4 bit, gui lenh FUNCTION SET voi tham so DL=0(0010xxxx)den LCD de bao che do mode muon su dung
92: */
93: sbi(data_out, 5); 94: cbi(ctrl, EN); 95: wait_lcd(); 96: 97: /*
98: Ghi ma FUNCTION SET vao LCD, 0x28=(001)0.1000
99: Mode 4 bit, LCD 2 dong, font 5x8
100: */
101: write_to_lcd(0x28); 102: wait_lcd(); 103: 104: /*
105: Display control, 0x0E=(0000.1)110
106: 0000.1=ma lenh display control, 110-xac lap hien thi LCD, hien thi cursor, khong blinking
107: */
108: cbi(ctrl, RS);//the following data is command
109: write_to_lcd(0x0E); 110: wait_lcd(); 111: 112: /*
113: Entry mode set 0x06
114: Hien thi tang, khong shift.
115: */
116: cbi(ctrl, RS); 117: write_to_lcd(0x06); 118: wait_lcd(); 119: 120: } 121: 122: /*
123: Khi khi ma lenh 0x02 AVR->LCD
124: Con tro cursor se tu dong di chuyen ve vi tri dau tien tren LCD (home)
125: */
126: void home_lcd(void) {
127: cbi(ctrl, RS);//The following data is COMMAND
128: write_to_lcd(0x02); 129: wait_lcd(); 130: } 131: 132: /*
133: Di chuyen con tro cursor den vi tri dong x, cot y
134: Thuc chat day la lenh set DDRAM address
135: Lenh nay co dang 1xxx.xxx, la mot so 7 bit chua dia chi DDRAM se di chuyen den
136: Cung 1 cot, vi tri duoc xac dinh = (64*(y-1))
137: Xac dinh dong duoc ghi = (x-1)
138: Ma lenh set dia chi DDRAM, ma 0x80
139: */
140: void move_lcd(uint8_t y, uint8_t x) {
141: uint8_t Ad; 142: 143: Ad = 64*(y-1)+(x-1)+0x80; 144: cbi(ctrl, RS); 145: write_to_lcd(Ad); 146: wait_lcd(); 147: } 148: 149: /*Xoa man hinh screen*/
150: void ctrl_lcd(void) {
151: cbi(ctrl, RS); 152: write_to_lcd(0x01); 153: wait_lcd(); 154: } 155: 156: /*Hien thi 1 ky tu tu AVR->LCD*/
157: void putChar_lcd(uint8_t chr) {
158: sbi(ctrl, RS); 159: write_to_lcd(chr); 160: wait_lcd(); 161: } 162: 163: /*Hien thi 1 chuoi ky tu tu AVR->LCD*/
164: void putString_lcd(char* str, unsigned char len) {
165: unsigned char i;
166: for (i=0; i<len; i++)
167: if (str[i]>0) {
168: putChar_lcd(str[i]);169: } else {
170: putChar_lcd(' ');
171: } 172: } 173: 174: int main (void) {
175: /*Data Dirrections for PORTC and PORTD pins*/
176: DDRB = 0xFF; 177: PORTB = 0x00; 178: 179: init_lcd(); 180: ctrl_lcd(); 181: 182: putChar_lcd(' ');
183: putChar_lcd(' ');;
184: 185: putChar_lcd('D');
186: putString_lcd("emo of the", 10);
187: move_lcd(2, 1);188: putString_lcd("2x16 LCD Display", 16);
189: 190: while (1) {
191: cbi(PORTB, 0); 192: _delay_ms(100); 193: sbi(PORTB, 0); 194: _delay_ms(100); 195: 196: }; 197: }
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