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annotate code_part1/OSTC_code_asm_part1/dump_screen.asm @ 841:8d73c9dcf851 default tip

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3.16 release
author mh
date Tue, 24 Oct 2023 10:38:04 +0200
parents a8a36c85e031
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
330
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1 ;=============================================================================
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2 ;
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3 ; File dump_screen.asm
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4 ;
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5 ; Dump screen contains to the serial interface.
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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) 2011, JD Gascuel.
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21 ;=============================================================================
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22 ; HISTORY
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23 ; 2011-05-08 : [jDG] Creation.
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24 ;
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25 ; BUGS :
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26 ; * ...
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27 ;=============================================================================
332
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28 CBLOCK 0x000
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29 ds_line ; Current line (0..239).
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30 ds_column ; Current columnx2 (0..159)
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31 ds_pixel:2 ; Current pixel color.
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32 ds_count ; Repetition count.
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33 ENDC
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34 ;=============================================================================
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35
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36 ; Manage interface to the OSTC platform:
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37 dump_screen:
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38 bcf uart_dump_screen ; clear flag!
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39
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40 movlw 'l'
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41 movwf TXREG ; Send command echo.
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42 bsf no_sensor_int ; No Sensor Interrupt
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43 bcf PIE1,RCIE ; no interrupt for UART
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44 bcf PIR1,RCIF ; clear flag
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45 bsf LED_blue ; LEDusb ON
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46 call rs232_wait_tx ; wait for UART
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47
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48 movff win_flags,WREG ; BEWARE: bank0 bit-test
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49 btfss WREG,1 ; Display1?
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50 call dump_screen_0 ; No, dump screen
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51
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52 bcf no_sensor_int ; Restore Sensor Interrupt
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53 bcf LED_blue ; Clear led
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54 bcf LED_red ; Clear led
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55 bsf PIE1,RCIE ; Interrupt for RS232
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56 return
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57
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58 ;=============================================================================
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59 ; Dump screen contains to the UART
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60
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61 dump_screen_0:
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62
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63 ;---- Send DISPLAY box command for the full screen window -------------------
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64 mullw 0 ; PRODH:L <- 0
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65
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66 AA_CMD_WRITE 0x35 ; VerticalStartAddress HIGH:LOW
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67 AA_DATA_WRITE_PROD ; 00:00
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68
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69 AA_CMD_WRITE 0x36 ; VerticalEndAddress HIGH:LOW
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70 AA_DATA_WRITE 0x01
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71 AA_DATA_WRITE 0x3F
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72
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73 AA_CMD_WRITE 0x37 ; HorizontalAddress START:END
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74 AA_DATA_WRITE 0x00
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75 AA_DATA_WRITE 0xEF
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76
477
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77 btfss win_flip_screen ; OSTC 2N have a flipped screen,
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78 bra dump_screen_mk2 ; So we should start 239 instead.
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79 movlw LOW(.239)
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80 movwf PRODL
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81 movlw HIGH(.239)
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82 movwf PRODH
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83 dump_screen_mk2:
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84
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85 AA_CMD_WRITE 0x20 ; Start Address Horizontal (.0 - .239)
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86 AA_DATA_WRITE_PROD ; 00:00
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87
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88 mullw 0 ; Make sure PROD is 0 again.
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89 AA_CMD_WRITE 0x21 ; Start Address Vertical (.0 - .319)
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90 AA_DATA_WRITE_PROD ; 00:00
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91
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92 AA_CMD_WRITE 0x22 ; Start reading.
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93 rcall DISP_DataRead ; Dummy pixel to skip.
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94 rcall DISP_DataRead ; Dummy pixel to skip.
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95
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96 movlw .160 ; 160x2 columns
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97 movwf ds_column
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98 rcall dump_screen_pixel_reset
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99
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100 dump_screen_1:
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101 btg LED_red ; LEDactivity toggle
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102
331
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103 AA_CMD_WRITE 0x22 ; Re-sync data.
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104
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105 setf TRISD ; PortD as input.
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106
332
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107 ; Dump even column
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108 movlw .240 ; 240 lines, once.
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109 movwf ds_line
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110 dump_screen_2:
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111 rcall DISP_DataRead ; read pixel-high byte
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112 movwf PRODH
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113 rcall DISP_DataRead ; read pixel-low byte
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114 movwf PRODL
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115 rcall dump_screen_pixel
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116
332
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117 decfsz ds_line,F
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118 bra dump_screen_2
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119 rcall dump_screen_pixel_flush
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120
332
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121 ; Dump odd column
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122 movlw .240 ; 240 lines, twice.
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123 movwf ds_line
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124 dump_screen_3:
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125 rcall DISP_DataRead ; read pixel-high byte
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126 movwf PRODH
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127 rcall DISP_DataRead ; read pixel-low byte
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128 movwf PRODL
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129 rcall dump_screen_pixel
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130
332
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131 decfsz ds_line,F
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132 bra dump_screen_3
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133 rcall dump_screen_pixel_flush
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134
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135 clrf TRISD ; Back to normal (PortD as output)
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136
332
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137 decfsz ds_column,F
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138 bra dump_screen_1
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139
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140 AA_CMD_WRITE 0x00 ; NOP, to stop Address Update Counter
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141 return
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142
332
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143 ;=============================================================================
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144 ; Pixel compression
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145 ;
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146 ; Input: PRODH:L = pixel.
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147 ; Output: Compressed stream on output.
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148 ; Compressed format:
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149 ; 0ccccccc : BLACK pixel, repeated ccccccc+1 times (1..128).
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150 ; 11cccccc : WHITE pixel, repeated cccccc+1 times (1..64).
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151 ; 10cccccc HIGH LOW : color pixel (H:L) repeated ccccc+1 times (1..64).
332
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152 ;
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153 dump_screen_pixel:
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154 movf PRODH,W ; Compare pixel-high
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155 xorwf ds_pixel+1,W
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156 bnz dump_screen_pixel_1 ; Different -> dump.
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157
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158 movf PRODL,W ; Compare pixel-low
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159 xorwf ds_pixel+0,W
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160 bnz dump_screen_pixel_1 ; Different -> dump.
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161
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162 incf ds_count,F ; Same color: just increment.
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163 return
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164
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165 dump_screen_pixel_1: ; Send (pixel,count) tuple
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166 movf ds_count,W ; Is count zero ?
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167 bz dump_screen_pixel_2 ; Yes: skip sending.
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168
336
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169 movf ds_pixel+1,W ; This is a BLACK pixel ?
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170 iorwf ds_pixel+0,W
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171 bz dump_screen_pix_black ; YES.
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172
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173 movf ds_pixel+1,W ; This is a white pixel ?
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174 andwf ds_pixel+0,W
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175 incf WREG
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176 bz dump_screen_pix_white ; YES.
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177
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178 ; No: write the pixel itself...
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179 movlw .64 ; Max color pixel on a single byte.
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180 cpfsgt ds_count ; Skip if count > 64
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181 movf ds_count,W ; W <- min(64,count)
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182 subwf ds_count,F ; ds_count <- ds_count-W
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183 decf WREG ; Save as 0..63
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184 iorlw b'10000000' ; MARK as a color pixel.
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185
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186 movwf TXREG
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187 call rs232_wait_tx ; wait for UART
332
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188 movff ds_pixel+1,TXREG
336
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189 call rs232_wait_tx ; wait for UART
332
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190 movff ds_pixel+0,TXREG
336
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191 call rs232_wait_tx ; wait for UART
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192 bra dump_screen_pixel_1
332
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193
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194 dump_screen_pixel_2:
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195 movff PRODH,ds_pixel+1 ; Save new pixel color
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196 movff PRODL,ds_pixel+0
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197 movlw 1
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198 movwf ds_count ; And set count=1.
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199 return
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200
336
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201 dump_screen_pix_black:
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202 movlw .128 ; Max black pixel on a single byte.
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203 cpfsgt ds_count ; Skip if count > 128
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204 movf ds_count,W ; W <- min(128,count)
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205 subwf ds_count,F ; ds_count <- ds_count-W
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206 decf WREG ; Save as 0..127
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207 dump_screen_pix_3:
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208 movwf TXREG
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209 call rs232_wait_tx
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210 bra dump_screen_pixel_1 ; More to dump ?
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211
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212 dump_screen_pix_white:
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213 movlw .64 ; Max white pixel on a single byte.
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214 cpfsgt ds_count ; Skip if count > 64
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215 movf ds_count,W ; W <- min(64,count)
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216 subwf ds_count,F ; ds_count <- ds_count-W
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217 decf WREG ; Save as 0..63
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218 iorlw b'11000000' ; MARK as a compressed white.
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219 bra dump_screen_pix_3
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220
332
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221 dump_screen_pixel_flush:
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222 clrf PRODH
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223 clrf PRODL
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224 rcall dump_screen_pixel_1 ; Send it
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225 dump_screen_pixel_reset:
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226 clrf ds_count ; But clear count.
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227 return