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annotate code_part1/OSTC_code_asm_part1/dump_screen.asm @ 332:1828234369fc ScreenDump

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Added dump_screen compression. From ~15 to ~2/3 secondes.
author JeanDo
date Wed, 11 May 2011 01:37:29 +0200
parents 469f4861c7c1
children 9ee86a19f1fa
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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 ;=============================================================================
330
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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 call dump_screen_0
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49
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50 bcf no_sensor_int ; Restore Sensor Interrupt
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51 bcf LED_blue ; Clear led
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52 bcf LED_red ; Clear led
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53 bsf PIE1,RCIE ; Interrupt for RS232
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54 return
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55
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56 ;=============================================================================
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57 ; Dump screen contains to the UART
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58
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59 dump_screen_0:
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60
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61 ;---- Send OLED box command for the full screen window -------------------
331
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62 mullw 0 ; PRODH:L <- 0
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63
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64 AA_CMD_WRITE 0x35 ; VerticalStartAddress HIGH:LOW
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65 AA_DATA_WRITE_PROD ; 00:00
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66
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67 AA_CMD_WRITE 0x36 ; VerticalEndAddress HIGH:LOW
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68 AA_DATA_WRITE 0x01
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69 AA_DATA_WRITE 0x3F
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70
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71 AA_CMD_WRITE 0x37 ; HorizontalAddress START:END
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72 AA_DATA_WRITE 0x00
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73 AA_DATA_WRITE 0xEF
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74
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75 AA_CMD_WRITE 0x20 ; Start Address Horizontal (.0 - .239)
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76 AA_DATA_WRITE_PROD ; 00:00
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77
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78 AA_CMD_WRITE 0x21 ; Start Address Vertical (.0 - .319)
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79 AA_DATA_WRITE_PROD ; 00:00
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80
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81 AA_CMD_WRITE 0x22 ; Start reading.
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82 rcall PLED_DataRead ; Dummy pixel to skip.
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83 rcall PLED_DataRead ; Dummy pixel to skip.
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84
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85 movlw .160 ; 160x2 columns
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86 movwf ds_column
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87 rcall dump_screen_pixel_reset
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88
330
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89 dump_screen_1:
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90 btg LED_red ; LEDactivity toggle
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91
331
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92 AA_CMD_WRITE 0x22 ; Re-sync data.
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93
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94 setf TRISD ; PortD as input.
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95
332
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96 ; Dump even column
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97 movlw .240 ; 240 lines, once.
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98 movwf ds_line
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99 dump_screen_2:
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100 rcall PLED_DataRead ; read pixel-high byte
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101 movwf PRODH
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102 rcall PLED_DataRead ; read pixel-low byte
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103 movwf PRODL
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104 rcall dump_screen_pixel
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105
332
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106 decfsz ds_line,F
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107 bra dump_screen_2
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108 rcall dump_screen_pixel_flush
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109
332
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110 ; Dump odd column
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111 movlw .240 ; 240 lines, twice.
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112 movwf ds_line
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113 dump_screen_3:
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114 rcall PLED_DataRead ; read pixel-high byte
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115 movwf PRODH
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116 rcall PLED_DataRead ; read pixel-low byte
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117 movwf PRODL
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118 rcall dump_screen_pixel
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119
332
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120 decfsz ds_line,F
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121 bra dump_screen_3
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122 rcall dump_screen_pixel_flush
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123
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124 clrf TRISD ; Back to normal (PortD as output)
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125
332
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126 decfsz ds_column,F
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127 bra dump_screen_1
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128
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129 AA_CMD_WRITE 0x00 ; NOP, to stop Address Update Counter
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130 return
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131
332
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132 ;=============================================================================
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133 ; Pixel compression
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134 ;
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135 ; Input: PRODH:L = pixel.
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136 ; Output: Compressed stream on output.
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137 ;
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138 dump_screen_pixel:
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139 movf PRODH,W ; Compare pixel-high
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140 xorwf ds_pixel+1,W
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141 bnz dump_screen_pixel_1 ; Different -> dump.
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142
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143 movf PRODL,W ; Compare pixel-low
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144 xorwf ds_pixel+0,W
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145 bnz dump_screen_pixel_1 ; Different -> dump.
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146
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147 incf ds_count,F ; Same color: just increment.
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148 return
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149
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150 dump_screen_pixel_1: ; Send (pixel,count) tuple
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151 movf ds_count,W ; Is count zero ?
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152 bz dump_screen_pixel_2 ; Yes: skip sending.
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153
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154 movff ds_pixel+1,TXREG
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155 call rs232_wait_tx ; wait for UART
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156 movff ds_pixel+0,TXREG
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157 call rs232_wait_tx ; wait for UART
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158 movff ds_count,TXREG
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159 call rs232_wait_tx ; wait for UART
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160
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161 dump_screen_pixel_2:
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162 movff PRODH,ds_pixel+1 ; Save new pixel color
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163 movff PRODL,ds_pixel+0
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164 movlw 1
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165 movwf ds_count ; And set count=1.
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166 return
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167
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168 dump_screen_pixel_flush:
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169 clrf PRODH
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170 clrf PRODL
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171 rcall dump_screen_pixel_1 ; Send it
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172 dump_screen_pixel_reset:
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173 clrf ds_count ; But clear count.
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174 return