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annotate code_part1/OSTC_code_asm_part1/aa_wordprocessor.asm @ 96:25433449bcb5

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adding anti-aliased fonts!
author heinrichsweikamp
date Sat, 11 Dec 2010 19:13:26 +0100
parents d79bf9df55d7
children 14a074e1a375
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1 ;=============================================================================
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2 ;
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3 ; File aa_wordprocessor.asm
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4 ;
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5 ; Anti-aliased word processor
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6 ;
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7 ; This program is free software: you can redistribute it and/or modify
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8 ; it under the terms of the GNU General Public License as published by
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9 ; the Free Software Foundation, either version 3 of the License, or
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10 ; (at your option) any later version.
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11 ;
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12 ; This program is distributed in the hope that it will be useful,
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13 ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 ; GNU General Public License for more details.
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16 ;
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17 ; You should have received a copy of the GNU General Public License
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18 ; along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 ;
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20 ; Copyright (c) 2010, JD Gascuel.
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21 ;=============================================================================
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22 ; HISTORY
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23 ; 2010-11-22 : [jDG] Creation.
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24 ; 2010-12-01 : [jDG] Adding 3bits antialiased fonts.
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25 ;
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26 ; BUGS :
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27 ; * If the three fonts are not in the same half of the PROM memory, TBLPTRU
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28 ; will be badly set, and font48 or font90 will display giberish...
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29 ;=============================================================================
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30 ;
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31 ; MEMORY FOOTPRINT:
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32 ;------------------
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33 ;
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34 ; wp_wordprocessor : 8KB, including fonts.
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35 ; aa_wordprocessor : 0.5KB code
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36 ; + 3.5KB aa_font28 (reduced to 99 chars)
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37 ; + 1.6KB aa_font48
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38 ; + 2.2KB aa_font90
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39 ; = 7.9 KB including fonts...
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40 ;
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41 ; Input registers:
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42 ; letter:26 String to print.
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43 ; win_font Font size (0=small, 1=medium, 2=large)
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44 ; win_color1:2 16bits unpacked color
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45 ; win_top, win_leftx2 Position on screen
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46 ; win_inverse Inverse video mode.
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47 ;
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48 ; Available general purpose registers:
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49 ; PRODH, PRODL (needed for array indexing)
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50 ; FSRx 12bits. Usefull as RAM pointers.
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51 ;=============================================================================
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52
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53 ; Flags allocation:
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54 #define aa_antialias aa_flags,0
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55 #define aa_color_quart aa_flags,1
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56 #define aa_color_half aa_flags,2
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57
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58 ; Extracted from p3_wordprocessor includes:
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59 #include aa_fonts.asm
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60 aa_wp code ; Mark segment into the .map file
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61
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62 ;------------------------------------------------------------------------------
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63 ; Setup pointers for a char:
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64 ; Inputs WREG = char to draw, win_font
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65 ; Output aa_start, aa_end, aa_height, aa_flags
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66 ; Trashed PRODH, PRODL, TBLPTR, TABLAT
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67 ;
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68 aa_char_setup:
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69 movwf PRODL,A ; save char into PROD for now.
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70
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71 movf win_font,W,BANKED ; Get font number (updates Z flag)
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72 bnz aa_char_1
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73
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74 ; SMALL font -----------------------------------------------------
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75 ; Font SMALL character folding...
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76 aa_char_0:
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77 movlw LOW aa_font28_block
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78 movwf TBLPTRL,A
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79 movlw HIGH aa_font28_block
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80 movwf TBLPTRH,A
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81 bra aa_char_3
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82
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83 ; MEDIUM font ----------------------------------------------------
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84 aa_char_1:
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85 decfsz WREG,A ; This is medium font ???
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86 bra aa_char_2
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87
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88 ; Font MEDIUM block:
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89 movlw LOW aa_font48_block
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90 movwf TBLPTRL,A
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91 movlw HIGH aa_font48_block
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92 movwf TBLPTRH,A
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93 bra aa_char_3
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94
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95 ; LARGE font -----------------------------------------------------
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96 aa_char_2:
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97 ; Font LARGE block:
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98 movlw LOW aa_font90_block
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99 movwf TBLPTRL,A
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100 movlw HIGH aa_font90_block
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101 movwf TBLPTRH,A
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102
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103 ; Execute font block ---------------------------------------------
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104 aa_char_3:
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105 movlw UPPER aa_font28_block
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106 movwf TBLPTRU,A
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107
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108 ; Proceed to character substitutions
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109 aa_char_30:
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110 tblrd*+ ; Read FROM char
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111 movf TABLAT,W ; Get it, and set Z,N
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112 bz aa_char_32 ; Break at end of translations
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113
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114 tblrd*+ ; Read TO char
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115 cpfseq PRODL,A ; FROM == current char ?
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116 bra aa_char_30 ; Different: loop
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117 movff TABLAT, PRODL ; make substitution
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118 bra aa_char_30 ; Loop.
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119
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120 ; Make sure char is in the available range
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121 aa_char_32:
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122 tblrd*+ ; Read first char
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123 movf TABLAT,W ; get it.
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124 subwf PRODL,F ; (char - first) --> PRODL
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125
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126 tblrd*+ ; Read nb chars
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127 movf TABLAT,W ; nbchars --> WREG
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128 tblrd*+ ; Read default char
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129 cpfslt PRODL ; if char > WREG ?
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130 movff TABLAT,PRODL ; replace PRODL
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131
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132 ; Decode font height and anti-aliasing mode
83
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133 clrf aa_flags,BANKED ; Default to no AA
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134 tblrd*+ ; Read font height + AA flag
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135 movf TABLAT,W ; into WREG
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136 bnn aa_char_34 ; High bit set ?
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137 bsf aa_antialias,BANKED ; YES : then the font is AA.
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138 aa_char_34
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139 andlw 0x7F ; Keep just font height,
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140 movwf aa_height,BANKED ; then save it (its a register)
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141
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142 ; Set PROM pointer to the char index
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143 movf PRODL,W ; Read back char
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144 mullw 2 ; PROD = 2*(char - base), TBLPTR=idx
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145 movf PRODL,W
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146 addwf TBLPTRL,F ; Add into TBLPTR (low byte)
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147 movf PRODH,W
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148 addwfc TBLPTRH,F ; and high byte.
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149
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150 ; Read start and stop pointers
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151 tblrd*+ ; aa_start = PROM16(*tblptr++)
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152 movff TABLAT,aa_start ; Read low byte
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153 tblrd*+
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154 movff TABLAT,aa_start+1 ; and high byte
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155
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156 tblrd*+ ; aa_end = PROM16(*tblptr++)
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157 movff TABLAT,aa_end ; Read low byte
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158 tblrd*+
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159 movff TABLAT,aa_end+1 ; and high byte
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160
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161 return
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162
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163 ;------------------------------------------------------------------------------
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164 ; Character width
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165 ; Inputs aa_start, aa_end, aa_width, aa_height, aa_flags
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166 ; Output width added to aa_width
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167 ; Trashed aa_bitlen, TBLPTR, TABLAT
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168 ;
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169 aa_char_width:
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170 movff aa_start, TBLPTRL ; TBLPTR = aa_start
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171 movff aa_start+1, TBLPTRH
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172 clrf aa_bitlen,BANKED ; clear reminders...
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173
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174 ; Read bitmap byte, and decode length:
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175 aa_char_width_1:
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176 ifdef AA_BYTE_SWAP
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177 btg TBLPTRL,0,A ; Toggle low ptr bit.
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178 tblrd*
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179 movf TABLAT,W,A ; Store to WREG
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180 btg TBLPTRL,0,A ; Get is back
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181 tblrd*+ ; then increment (but trash TABLAT)
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182 movwf TABLAT,A ; Then restore copy to TABLAT.
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183 else
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184 tblrd*+ ; Normal read...
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185 movf TABLAT,W,A ; Store copy to WREG
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186 endif
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187 btfss aa_antialias,BANKED ; Antialiased font ?
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188 bra aa_char_width_10 ; No: always 7 bits count
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189
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190 bn aa_char_width_10 ; Non-white pixels ?
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191 andlw 0x1F ; Yes : 5 bits count.
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192 aa_char_width_10:
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193 andlw 0x7F ; No: 7 bit count.
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194 incf WREG,A ; WREG = repetition count
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195 addwf aa_bitlen,F,BANKED ; Add remaining pixels from last code.
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196
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197 movf aa_height,W,BANKED ; WREG = - height
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198 negf WREG,A
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199
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200 ; This is a hand-made division by successive substraction of height
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201 aa_char_width_2:
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202 addwf aa_bitlen,F,BANKED ; Try to substract aa_height
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203 bn aa_char_width_3 ; If neg it was a bad idea...
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204
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205 infsnz aa_width,F,BANKED ; Succeded: do a 12bit increment
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206 incf aa_width+1,F,BANKED ; on the aa_width counter.
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207 bra aa_char_width_2 ; and loop.
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208
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209 aa_char_width_3:
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210 negf WREG,A ; WREG = +height
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211 addwf aa_bitlen,F,BANKED ; Restore true reminder.
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212
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213 ; Are we done ?
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214 movf TBLPTRL,W,A ; Compare TBLPTR to aa_end
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215 cpfseq aa_end,BANKED
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216 bra aa_char_width_1 ; Loop if LOW is different
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217 movf TBLPTRH,W,A
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218 cpfseq aa_end+1,BANKED ; Loop to if HIGH is different
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219 bra aa_char_width_1
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220
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221 return
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222
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223 ;------------------------------------------------------------------------------
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224 ; String width
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225 ; Inputs letter (SHOULD BE NULL TERMINATED)
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226 ; Output aa_width, aa_height
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227 ; Trashed PROD, TBLPTR, FSR2, aa_bitlen, aa_start, aa_end, aa_flags
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228 ;
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229 aa_string_width:
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230 lfsr FSR2, letter ; FSR2 pointer to start of string.
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231
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232 clrf aa_width,BANKED ; Clear width sum.
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233 clrf aa_width+1,BANKED ; (12 bit counter)
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234
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235 aa_string_width_1:
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236 movf POSTINC2,W,A ; WREG = *FSR2++
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237 bz aa_string_width99 ; Exit if null byte encountered.
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238
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239 rcall aa_char_setup ; setup aa_start / aa_end
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240 rcall aa_char_width ; sum-up width into aa_width
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241 bra aa_string_width_1 ; and loop.
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242
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243 aa_string_width99:
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244 return
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245
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246 ;------------------------------------------------------------------------------
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247 ; Fast macros to write to OLED display.
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248 ; Adding a call/return adds 3 words and a pipeline flush, hence make it
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249 ; nearly twice slower...
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250 ;
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251 ; Input : commande as macro parameter.
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252 ; Output : NONE
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253 ; Trash : WREG
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254 ;
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255 AA_CMD_WRITE macro cmd
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256 movlw cmd
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257 bcf oled_rs ; Cmd mode
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258 movwf PORTD,A
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259 bcf oled_rw ; Tick the clock
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260 bsf oled_rw
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261 endm
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262 ;
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263 ; Input : PRODH:L as 16bits data.
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264 ; Output : NONE
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265 ; Trash : NONE
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266 ;
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267 AA_DATA_WRITE_PROD macro
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268 bsf oled_rs ; Data mode
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269 movff PRODH,PORTD ; NOTE: OLED is BIGENDIAN!
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270 bcf oled_rw ; Tick the clock
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271 bsf oled_rw
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272 movff PRODL,PORTD
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273 bcf oled_rw ; Tick the clock
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274 bsf oled_rw
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275 endm
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276
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277 ;------------------------------------------------------------------------------
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278 ; Output OLED Window Address commands.
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279 ; Inputs : win_top, win_leftx2, aa_height, aa_width.
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280 ; Output : PortD commands.
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281 ; Trashed: PROD
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282 ;
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283 aa_box_cmd:
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284 movf win_leftx2,W,BANKED ; Compute left = 2*leftx2
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285 mullw 2
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286 AA_CMD_WRITE 0x35 ; this is the left border
83
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287 AA_DATA_WRITE_PROD
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288
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289 movf aa_width,W,BANKED ; right = left + width - 1
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290 addwf PRODL,F,A
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291 movf aa_width+1,W,BANKED
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292 addwfc PRODH,F,A
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293 decf PRODL,F,A ; decrement result
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294 bc aa_box_cmd_1 ; No borrow (/Carry) ? skip propagating.
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295 decf PRODH,F,A
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296 aa_box_cmd_1:
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297 AA_CMD_WRITE 0x36 ; Write and the right border
83
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298 AA_DATA_WRITE_PROD
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299
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300 movf win_top,W,BANKED ; Write top / bottom window
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301 movwf PRODH,A ; (remember PRODH output first)
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302 addwf aa_height,W,BANKED
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303 decf WREG,A
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304 movwf PRODL,A ; And PRODL is later...
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305 AA_CMD_WRITE 0x37
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306 AA_DATA_WRITE_PROD
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307
96
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308 movf win_top,W,BANKED ; Start ptr top
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309 mullw 1 ; Load into PRODH:L
95
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310 AA_CMD_WRITE 0x20
96
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311 AA_DATA_WRITE_PROD
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312
83
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313 movf win_leftx2,W,BANKED ; Start ptr left
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314 mullw 2
95
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315 AA_CMD_WRITE 0x21
83
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316 AA_DATA_WRITE_PROD
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317
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318 return
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319
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320 ;------------------------------------------------------------------------------
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321 ; Decode a compressed char.
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322 ; Inputs aa_start, aa_end, aa_height, win_invert, win_color1, win_color2
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323 ; Output none
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324 ; Trashed TBLPTR, TABLAT, PROD, aa_bitlen, aa_flags, aa_colorDir:2
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325 ;
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326 aa_decode_char:
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327 movff aa_start, TBLPTRL ; TBLPTR = aa_start
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328 movff aa_start+1, TBLPTRH
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329
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330 ; Read bitmap byte, and decode color & length
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331 aa_decode_1:
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332 ifdef AA_BYTE_SWAP
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333 btg TBLPTRL,0,A ; Toggle low ptr bit.
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334 tblrd*
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335 movf TABLAT,W,A ; Store to WREG
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336 btg TBLPTRL,0,A ; Get is back
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337 tblrd*+ ; then increment (but trash TABLAT)
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338 movwf TABLAT,A ; Then restore copy to TABLAT.
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339 else
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340 tblrd*+ ; Normal read...
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341 movf TABLAT,W,A ; Store copy to WREG
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342 endif
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343 btfss aa_antialias,BANKED ; Antialiased font ?
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344 bra aa_decode_10 ; No: always 7 bits count
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345 bn aa_decode_10 ; Non-white pixels ?
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346 andlw 0x1F ; Yes : 5 bits count.
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347 aa_decode_10:
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348 andlw 0x7F ; No: 7 bit count.
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349 incf WREG,A
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350 movwf aa_bitlen,BANKED ; repetition count --> aa_bitlen
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351
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352 ;---- COLOR DECODING ---------------------------------------------
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353 ;
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354 ; Code Normal Inverse
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355 ; 1xx 0% 100% : Managed by aa_decode_13
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356 ; 011 25% 75%
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357 ; 010 50% 50%
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358 ; 001 75% 25%
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359 ; 000 100% 0% : Managed by aa_decode_13 too.
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360 ;
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361 movf TABLAT,W,A ; Get back code
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362 btfss aa_antialias,BANKED ; Antialiased font ?
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363 bra aa_decode_13 ; NO: 1bit case
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364
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365 ; Asymetry test: 1xx code is another case for 1bit color.
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366 ; This have to be done before inverse video, because
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367 ; of the asymetric processing !
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368 bn aa_decode_13 ; decode as not-aa
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369
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370 ; Manage 000 special case too:
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371 andlw 0xE0 ; Select color bits
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372 bz aa_decode_13 ; That's a 000 !
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373
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374 ; Apply reverse video, in a reversed way
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375 btfss win_invert,0 ; Inverse video mode ?
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376 sublw 0x80
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377
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378 ; Move the two bits to aa_color_half and aa_color_quarter:
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379 swapf WREG ; --> 0000.0LL0 byte
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380 iorlw b'001' ; We are in AA mode, don't forget it !
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381 movwf aa_flags ; save that to aa_color_(half/quad)/AA flags.
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382
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383 ;---- 2 bit x RGB(16bits) computation ----------------------------
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384 clrf PRODL ; We will accumulate result here...
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385 clrf PRODH
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386
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387 ; Take color div 2 into aa_colorDiv. Max red = 15/31
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388 rrcf win_color1,W,BANKED ; xRRRRxGG
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389 andlw b'01111011' ; 0RRRR0GG (don't change C)
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390 movwf aa_colorDiv+0,BANKED
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391 rrcf win_color2,W,BANKED ; GGGxBBBB
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392 andlw b'11101111' ; GGG0BBBB
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393 movwf aa_colorDiv+1,BANKED
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394
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395 btfss aa_color_half
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396 bra aa_decode_12
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397
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398 movff aa_colorDiv+0,PRODH ; Add color/2 if bit set.
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399 movff aa_colorDiv+1,PRODL ; OLED is big endian, so swap here.
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400 aa_decode_12:
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401 btfss aa_color_quart
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402 bra aa_decode_3
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403
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404 ; Divide it once again by 2. Max red = 7/31.
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405 rrcf aa_colorDiv+0,W,BANKED ; xxRRRxxG
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406 andlw b'00111001' ; 00RRR00G (don't change C)
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407 movwf aa_colorDiv+0,BANKED
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408 rrcf aa_colorDiv+1,W,BANKED ; GGGxxBBB
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409 andlw b'11100111' ; GGG00BBB
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410 movwf aa_colorDiv+1,BANKED
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411
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412 movf aa_colorDiv+1,W,BANKED ; Add color/4
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413 addwf PRODL,F ; NOTE: 7/31+15/31=22/31,
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414 movf aa_colorDiv+0,W,BANKED ; hence composants won't overlap.
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415 addwfc PRODH,F ; In right order, to propagate carry.
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416
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417 bra aa_decode_3 ; Done.
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418
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419 ; ---- Simple BLACK and WHITE cases ------------------------------
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420 aa_decode_13: ; Got a 1xx or a 000 code...
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421 btfsc win_invert,0 ; Inverse video mode ?
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422 xorlw 0x80 ; YES: invert levels.
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423 bn aa_decode_2 ; Then test high bit.
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424
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425 ; WHITE pixel (ie. full color)
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426 movff win_color1,PRODH ; current draw color
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427 movff win_color2,PRODL ; (rem: OLED is big endian)
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428 bra aa_decode_3
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429
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430 aa_decode_2:
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431 clrf PRODH,A ; BLACK pixel
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432 clrf PRODL,A
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433
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434 aa_decode_3:
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435 ;---- PIXEL WRITE LOOP -------------------------------------------
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436 AA_DATA_WRITE_PROD
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437 decf aa_bitlen,BANKED
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438 bnz aa_decode_3
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439
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440 ;---- BYTE-CODE LOOP ---------------------------------------------
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441 ; Are we done ?
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442 movf TBLPTRL,W,A ; Compare TBLPTR to aa_end
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443 cpfseq aa_end,BANKED
96
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444 bra aa_decode_1 ; Loop if LOW is different
83
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445 movf TBLPTRH,W,A
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446 cpfseq aa_end+1,BANKED ; Loop to if HIGH is different
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447 bra aa_decode_1
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448
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449 return
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450
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451 ;------------------------------------------------------------------------------
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452 ; Setup pointers for a char:
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453 ; Inputs : letter : string to print (SHOULD BE NULL TERMINATED)
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454 ; Output : OLED commands on port D + clocks.
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455 ;
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456 aa_wordprocessor:
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457 ; Make sure context is well known
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458 movlb HIGH aa_start ; Switch to bank 0...
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459
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460 rcall aa_string_width ; Set aa_height, compute aa_width
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461 rcall aa_box_cmd ; Use that for the box.
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462
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463 ; Restart the loop for each char to print
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464 lfsr FSR2, letter ; FSR2 pointer to start of string.
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465
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466 ; DATA bloc commande:
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467 AA_CMD_WRITE 0x22
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468
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469 aa_wordprocessor_1:
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470 movf POSTINC2,W,A ; WREG = *FSR2++
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471 bz aa_wordprocessor_99 ; Exit if null byte encountered.
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472
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473 rcall aa_char_setup ; setup aa_start / aa_end
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474 rcall aa_decode_char ; sum-up width into aa_width
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475 bra aa_wordprocessor_1 ; and loop.
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476
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477 aa_wordprocessor_99:
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478 ; END of bloc commande
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479 AA_CMD_WRITE 0x00
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480
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481 return