gavrasm Gerd's AVR assembler version 2.1 (C)2006 by DG4FAC ---------------------------------------------------------- Source file: hello.LCD.44.asm Hex file: hello.LCD.44.hex Eeprom file: hello.LCD.44.eep Compiled: 17.11.2008, 01:35:22 Pass: 2 1: ; 2: ; hello.LCD.44.asm 3: ; 4: ; LCD hello-world 5: ; 6: ; Neil Gershenfeld 7: ; CBA MIT 11/15/08 8: ; 9: ; (c) Massachusetts Institute of Technology 2008 10: ; Permission granted for experimental and personal use; 11: ; license for commercial sale available from MIT. 12: ; 13: .include "tn44def.inc" -> Warning 009: Include defs not necessary, using internal values! File: hello.LCD.44.asm, Line: 13 Source line: .include "tn44def.inc" 14: ; 15: ; definitions 16: ; 17: .equ DB7 = PA0 18: .equ DB6 = PA2 19: .equ DB5 = PA1 20: .equ DB4 = PA3 21: .equ E = PA5 22: .equ RS = PA4 23: ; 24: ; registers 25: ; 26: .def lcdbyte = R16 27: .def temp = R18 28: .def temp1 = R19 29: .def temp2 = R20 30: .def temp3 = R21 31: ; 32: ; code segment 33: ; 34: .cseg 35: .org 0 36: 000000 C066 rjmp reset 37: ; 38: ; long_delay 39: ; delay before redraw 40: ; 41: .equ long_delay_time = 100 42: long_delay: 43: 000001 E634 ldi temp1, long_delay_time 44: long_delay1: 45: 000002 E644 ldi temp2, long_delay_time 46: long_delay2: 47: 000003 E654 ldi temp3, long_delay_time 48: long_delay3: 49: 000004 955A dec temp3 50: 000005 F7F1 brne long_delay3 51: 000006 954A dec temp2 52: 000007 F7D9 brne long_delay2 53: 000008 953A dec temp1 54: 000009 F7C1 brne long_delay1 55: 00000A 9508 ret 56: ; 57: ; lcd_delay 58: ; delay between commands 59: ; 60: .equ lcd_delay_time = 100 61: lcd_delay: 62: 00000B E634 ldi temp1, lcd_delay_time 63: lcd_delay1: 64: 00000C E644 ldi temp2, lcd_delay_time 65: lcd_delay2: 66: 00000D 954A dec temp2 67: 00000E F7F1 brne lcd_delay2 68: 00000F 953A dec temp1 69: 000010 F7D9 brne lcd_delay1 70: 000011 9508 ret 71: ; 72: ; lcd_putchar 73: ; put character in lcdbyte 74: ; 75: lcd_putchar: 76: ; 77: ; set RS for data 78: ; 79: 000012 9ADC sbi PORTA, RS 80: ; 81: ; output high nibble 82: ; 83: 000013 98D8 cbi PORTA, DB7 84: 000014 FD07 sbrc lcdbyte, 7 85: 000015 9AD8 sbi PORTA, DB7 86: 000016 98DA cbi PORTA, DB6 87: 000017 FD06 sbrc lcdbyte, 6 88: 000018 9ADA sbi PORTA, DB6 89: 000019 98D9 cbi PORTA, DB5 90: 00001A FD05 sbrc lcdbyte, 5 91: 00001B 9AD9 sbi PORTA, DB5 92: 00001C 98DB cbi PORTA, DB4 93: 00001D FD04 sbrc lcdbyte, 4 94: 00001E 9ADB sbi PORTA, DB4 95: ; 96: ; strobe E 97: ; 98: 00001F 0000 nop 99: 000020 9ADD sbi PORTA, E 100: 000021 0000 nop 101: 000022 98DD cbi PORTA, E 102: ; 103: ; wait 104: ; 105: 000023 DFE7 rcall lcd_delay ; can be shorter 106: ; 107: ; output low nibble 108: ; 109: 000024 98D8 cbi PORTA, DB7 110: 000025 FD03 sbrc lcdbyte, 3 111: 000026 9AD8 sbi PORTA, DB7 112: 000027 98DA cbi PORTA, DB6 113: 000028 FD02 sbrc lcdbyte, 2 114: 000029 9ADA sbi PORTA, DB6 115: 00002A 98D9 cbi PORTA, DB5 116: 00002B FD01 sbrc lcdbyte, 1 117: 00002C 9AD9 sbi PORTA, DB5 118: 00002D 98DB cbi PORTA, DB4 119: 00002E FD00 sbrc lcdbyte, 0 120: 00002F 9ADB sbi PORTA, DB4 121: ; 122: ; strobe E 123: ; 124: 000030 0000 nop 125: 000031 9ADD sbi PORTA, E 126: 000032 0000 nop 127: 000033 98DD cbi PORTA, E 128: ; 129: ; wait and return 130: ; 131: 000034 DFD6 rcall lcd_delay ; can be shorter 132: 000035 9508 ret 133: ; 134: ; lcd_putcmd 135: ; put command in lcdbyte 136: ; 137: lcd_putcmd: 138: ; 139: ; clear RS for command 140: ; 141: 000036 98DC cbi PORTA, RS 142: ; 143: ; output command bits 144: ; 145: 000037 BB0B out PORTA, lcdbyte 146: ; 147: ; strobe E 148: ; 149: 000038 0000 nop 150: 000039 9ADD sbi PORTA, E 151: 00003A 0000 nop 152: 00003B 98DD cbi PORTA, E 153: ; 154: ; wait and return 155: ; 156: 00003C DFCE rcall lcd_delay 157: 00003D 9508 ret 158: ; 159: ; lcd_init 160: ; initialize the LCD 161: ; 162: lcd_init: 163: ; 164: ; power-up delay 165: ; 166: 00003E DFCC rcall lcd_delay 167: ; 168: ; initialization sequence 169: ; 170: 00003F E00A ldi lcdbyte, (1 << DB5) + (1 << DB4) 171: 000040 DFF5 rcall lcd_putcmd 172: 000041 E00A ldi lcdbyte, (1 << DB5) + (1 << DB4) 173: 000042 DFF3 rcall lcd_putcmd 174: 000043 E00A ldi lcdbyte, (1 << DB5) + (1 << DB4) 175: 000044 DFF1 rcall lcd_putcmd 176: ; 177: ; 4-bit interface 178: ; 179: 000045 E002 ldi lcdbyte, (1 << DB5) 180: 000046 DFEF rcall lcd_putcmd 181: ; 182: ; two lines, 5x7 font 183: ; 184: 000047 E002 ldi lcdbyte, (1 << DB5) 185: 000048 DFED rcall lcd_putcmd 186: 000049 E001 ldi lcdbyte, (1 << DB7) 187: 00004A DFEB rcall lcd_putcmd 188: ; 189: ; display on 190: ; 191: 00004B 2700 clr lcdbyte 192: 00004C DFE9 rcall lcd_putcmd 193: 00004D E007 ldi lcdbyte, (1 << DB7) + (1 << DB6) + (1 << DB5) 194: 00004E DFE7 rcall lcd_putcmd 195: ; 196: ; entry mode 197: ; 198: 00004F 2700 clr lcdbyte 199: 000050 DFE5 rcall lcd_putcmd 200: 000051 E006 ldi lcdbyte, (1 << DB6) + (1 << DB5) 201: 000052 DFE3 rcall lcd_putcmd 202: 000053 9508 ret 203: ; 204: ; lcd_print 205: ; print a null-terminated string 206: ; 207: lcd_print: 208: lcd_print_loop: 209: 000054 95C8 lpm 210: 000055 2D00 mov lcdbyte, R0 211: 000056 3000 cpi lcdbyte, 0 212: 000057 F019 breq return 213: 000058 DFB9 rcall lcd_putchar 214: 000059 9631 adiw zl, 1 215: 00005A CFF9 rjmp lcd_print_loop 216: return: 217: 00005B 9508 ret 218: ; 219: ; strings to print 220: ; 221: line_1: 222: .db "Hello to",0 -> Warning 004: Number of bytes on line is odd, added 00 to fit program memory! File: hello.LCD.44.asm, Line: 222 Source line: .db "Hello to",0 00005C 6548 6C6C 206F 6F74 000060 0000 223: line_2: 224: .db "the world!",0 -> Warning 004: Number of bytes on line is odd, added 00 to fit program memory! File: hello.LCD.44.asm, Line: 224 Source line: .db "the world!",0 000061 6874 2065 6F77 6C72 000065 2164 0000 225: ; 226: ; reset routine 227: ; 228: reset: 229: ; 230: ; set stack pointer to top of RAM 231: ; 232: 000067 E021 ldi temp, high(RAMEND) 233: 000068 BF2E out SPH, temp 234: 000069 E52F ldi temp, low(RAMEND) 235: 00006A BF2D out SPL, temp 236: ; 237: ; init I/O pins 238: ; 239: 00006B 98D8 cbi PORTA, DB7 240: 00006C 9AD0 sbi DDRA, DB7 241: 00006D 98DA cbi PORTA, DB6 242: 00006E 9AD2 sbi DDRA, DB6 243: 00006F 98D9 cbi PORTA, DB5 244: 000070 9AD1 sbi DDRA, DB5 245: 000071 98DB cbi PORTA, DB4 246: 000072 9AD3 sbi DDRA, DB4 247: 000073 98DD cbi PORTA, E 248: 000074 9AD5 sbi DDRA, E 249: 000075 98DC cbi PORTA, RS 250: 000076 9AD4 sbi DDRA, RS 251: ; 252: ; init LCD 253: ; 254: 000077 DFC6 rcall lcd_init 255: ; 256: ; main loop 257: ; 258: main: 259: ; 260: ; go to zero position 261: ; 262: 000078 2700 clr lcdbyte 263: 000079 DFBC rcall lcd_putcmd 264: 00007A E002 ldi lcdbyte, (1 << DB5) 265: 00007B DFBA rcall lcd_putcmd 266: ; 267: ; print first line 268: ; 269: 00007C EBE8 ldi zl,low(line_1*2) 270: 00007D E0F0 ldi zh,high(line_1*2) 271: 00007E DFD5 rcall lcd_print 272: ; 273: ; move to second line 274: ; 275: 00007F E005 ldi lcdbyte, (1 << DB7) + (1 << DB6) 276: 000080 DFB5 rcall lcd_putcmd 277: 000081 2700 clr lcdbyte 278: 000082 DFB3 rcall lcd_putcmd 279: ; 280: ; print second line 281: ; 282: 000083 ECE2 ldi zl,low(line_2*2) 283: 000084 E0F0 ldi zh,high(line_2*2) 284: 000085 DFCE rcall lcd_print 285: ; 286: ; pause 287: ; 288: 000086 DF7A rcall long_delay 289: ; 290: ; clear display 291: ; 292: 000087 2700 clr lcdbyte 293: 000088 DFAD rcall lcd_putcmd 294: 000089 E008 ldi lcdbyte, (1 << DB4) 295: 00008A DFAB rcall lcd_putcmd 296: ; 297: ; repeat 298: ; 299: 00008B CFEC rjmp main Program : 129 words. Constants : 11 words. Total program memory: 140 words. Eeprom space : 0 bytes. Data segment : 0 bytes. Compilation completed, no errors. Compilation endet 17.11.2008, 01:35:22