gavrasm Gerd's AVR assembler version 2.1 (C)2006 by DG4FAC ---------------------------------------------------------- Source file: hello.video.44.asm Hex file: hello.video.44.hex Eeprom file: hello.video.44.eep Compiled: 14.11.2008, 22:40:04 Pass: 2 1: ; 2: ; hello.video.44.asm 3: ; 4: ; NTSC/RS170 video hello-world 5: ; 6: ; set fuse low byte to 0x76 for 20 MHz resonator 7: ; 8: ; Neil Gershenfeld 9: ; CBA MIT 11/18/07 10: ; 11: ; (c) Massachusetts Institute of Technology 2007 12: ; Permission granted for experimental and personal use; 13: ; license for commercial sale available from MIT. 14: ; 15: .include "tn44def.inc" -> Warning 009: Include defs not necessary, using internal values! File: hello.video.44.asm, Line: 15 Source line: .include "tn44def.inc" 16: ; 17: ; definitions 18: ; 19: .equ pin_499 = PA7 ; 499 ohm DAC pin 20: .equ pin_1000 = PA6 ; 1000 ohm DAC pin 21: ; 22: ; registers 23: ; 24: .def zero = R0 ; 0V 25: .def black = R1 ; .306V for 499,1k DAC 26: .def gray = R2 ; .613V for 499,1k DAC 27: .def white = R3 ; .919V for 499,1k DAC 28: .def temp = R16 ; temp variable 29: .def temp1 = R17 ; temp variable 30: .def row_counter = R18 ; row counter 31: .def col_counter = R19 ; col counter 32: ; R30, 31 used for z pointer 33: ; 34: ; macros 35: ; 36: .macro count 37: ; 38: ; delay counter 39: ; 40: ldi temp, @0 ; set match count 41: ldi temp1, @1 ; 42: out OCR1AH, temp ; 43: out OCR1AL, temp1 ; 44: clr temp ; clear counter 45: out TCNT1H, temp ; 46: out TCNT1L, temp ; 47: sbi TIFR1, OCF1A ; clear count match flag 48: count_loop: 49: sbis TIFR1, OCF1A 50: rjmp count_loop 51: .endmacro 52: .macro 0V 53: ; 54: ; output 0V 55: ; 56: out PORTA, zero 57: .endmacro 58: .macro black 59: ; 60: ; output black level 61: ; 62: out PORTA, black 63: .endmacro 64: .macro horizontal_sync 65: ; 66: ; 4.7us horizontal sync 67: ; 68: count 0,82 69: .endmacro 70: .macro front_porch 71: ; 72: ; off-screen beginning of scan line 73: ; 74: count 0,130 75: .endmacro 76: .macro scan_line 77: ; 78: ; 58.8us complete scan line 79: ; 80: count 4,142 81: .endmacro 82: .macro back_porch 83: ; 84: ; off-screen end of scan line 85: ; 86: count 0,70 87: .endmacro 88: .macro blank_line 89: ; 90: ; blank horizontal scan line 91: ; 92: 0V 93: horizontal_sync 94: black 95: scan_line 96: .endmacro 97: .macro sync_line 98: ; 99: ; vertical sync line 100: ; 101: ; inverted horizontal sync 102: ; 103: black 104: horizontal_sync 105: ; 106: ; inverted scan line 107: ; 108: 0V 109: scan_line 110: .endmacro 111: ; 112: ; code segment 113: ; 114: .cseg 115: .org 0 116: 000000 C000 rjmp reset 117: ; 118: ; main program 119: ; 120: reset: 121: ; 122: ; set clock divider to /1 123: ; 124: 000001 E800 ldi temp, (1 << CLKPCE) 125: 000002 E010 ldi temp1, (0 << CLKPS3) | (0 << CLKPS2) | (0 << CLKPS1) | (0 << CLKPS0) 126: 000003 BD06 out CLKPR, temp 127: 000004 BD16 out CLKPR, temp1 128: ; 129: ; set counter prescaler to /1 130: ; 131: 000005 E001 ldi temp, (1 << CS10) 132: 000006 BD0E out TCCR1B, temp 133: ; 134: ; set stack pointer to top of RAM 135: ; 136: 000007 E001 ldi temp, high(RAMEND) 137: 000008 BF0E out SPH, temp 138: 000009 E50F ldi temp, low(RAMEND) 139: 00000A BF0D out SPL, temp 140: ; 141: ; init DAC pins 142: ; 143: 00000B 98DF cbi PORTA, pin_499 144: 00000C 9AD7 sbi DDRA, pin_499 145: 00000D 98DE cbi PORTA, pin_1000 146: 00000E 9AD6 sbi DDRA, pin_1000 147: ; 148: ; set DAC value registers 149: ; 150: 00000F E000 ldi temp, 0 151: 000010 2E00 mov zero, temp 152: 000011 E400 ldi temp, (1 << pin_1000) 153: 000012 2E10 mov black, temp 154: 000013 E800 ldi temp, (1 << pin_499) 155: 000014 2E20 mov gray, temp 156: 000015 EC00 ldi temp, ((1 << pin_499) | (1 << pin_1000)) 157: 000016 2E30 mov white, temp 158: ; 159: ; store test pattern in SRAM 160: ; 161: 000017 E6E0 ldi zl, low(SRAM_START) 162: 000018 E0F0 ldi zh, high(SRAM_START) 163: 000019 E238 ldi col_counter, 40 164: store_loop: 165: 00001A 9211 st z+, black 166: 00001B 9221 st z+, gray 167: 00001C 9211 st z+, black 168: 00001D 9231 st z+, white 169: 00001E 953A dec col_counter 170: 00001F F7D1 brne store_loop 171: ; 172: ; start main loop 173: ; 174: main_loop: 175: ; 176: ; 242 63.5us horizontal scan lines 177: ; 178: 000020 EF22 ldi row_counter, 242 179: row_loop: 180: 0V 181: horizontal_sync 182: black 183: front_porch 184: ; 185: ; set z to point to test pattern 186: ; 187: 000037 E6E0 ldi zl, low(SRAM_START) 188: 000038 E0F0 ldi zh, high(SRAM_START) 189: ; 190: ; column loop 191: ; 192: 000039 EA30 ldi col_counter, 160 193: col_loop: 194: 00003A 9101 ld temp, z+ 195: 00003B BB0B out PORTA, temp 196: 00003C 953A dec col_counter 197: 00003D F7E1 brne col_loop 198: black 199: back_porch 200: 000049 952A dec row_counter 201: 00004A F009 breq row_loop_continue 202: 00004B CFD5 rjmp row_loop 203: row_loop_continue: 204: ; 205: ; 5 black lines 206: ; 207: 00004C E025 ldi row_counter, 5 208: black_loop: 209: 0V 210: horizontal_sync 211: black 212: scan_line 213: 000063 952A dec row_counter 214: 000064 F741 brne black_loop 215: ; 216: ; 3 vertical sync lines 217: ; 218: 000065 E023 ldi row_counter, 3 219: sync_loop: 220: sync_line 221: 00007C 952A dec row_counter 222: 00007D F741 brne sync_loop 223: ; 224: ; 12 black lines 225: ; 226: 00007E E02C ldi row_counter, 12 227: black_loop1: 228: 0V 229: horizontal_sync 230: black 231: scan_line 232: 000095 952A dec row_counter 233: 000096 F741 brne black_loop1 234: ; 235: ; 60Hz main loop 236: ; 237: 000097 CF88 rjmp main_loop 238: Program : 152 words. Constants : 0 words. Total program memory: 152 words. Eeprom space : 0 bytes. Data segment : 0 bytes. Compilation completed, no errors. Compilation endet 14.11.2008, 22:40:04