Mercurial > public > mk2
changeset 336:9ee86a19f1fa ScreenDump
Beter compression for black/white pixels: ~1sec screen dumps.
| author | JeanDo |
|---|---|
| date | Mon, 16 May 2011 23:52:38 +0200 |
| parents | d36fe3651d56 |
| children | 6bdf80d7276c |
| files | code_part1/OSTC_code_asm_part1/dump_screen.asm |
| diffstat | 1 files changed, 47 insertions(+), 5 deletions(-) [+] |
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--- a/code_part1/OSTC_code_asm_part1/dump_screen.asm Fri May 13 02:09:06 2011 +0200 +++ b/code_part1/OSTC_code_asm_part1/dump_screen.asm Mon May 16 23:52:38 2011 +0200 @@ -126,7 +126,7 @@ decfsz ds_column,F bra dump_screen_1 - AA_CMD_WRITE 0x00 ; NOP, to stop Address Update Counter + AA_CMD_WRITE 0x00 ; NOP, to stop Address Update Counter return ;============================================================================= @@ -134,6 +134,10 @@ ; ; Input: PRODH:L = pixel. ; Output: Compressed stream on output. +; Compressed format: +; 0ccccccc : BLACK pixel, repeated ccccccc+1 times (1..128). +; 11cccccc : WHITE pixel, repeated cccccc+1 times (1..64). +; 10cccccc HIGH LOW : color pixel (H:L) repeated ccccc+1 times (1..64). ; dump_screen_pixel: movf PRODH,W ; Compare pixel-high @@ -151,12 +155,30 @@ movf ds_count,W ; Is count zero ? bz dump_screen_pixel_2 ; Yes: skip sending. + movf ds_pixel+1,W ; This is a BLACK pixel ? + iorwf ds_pixel+0,W + bz dump_screen_pix_black ; YES. + + movf ds_pixel+1,W ; This is a white pixel ? + andwf ds_pixel+0,W + incf WREG + bz dump_screen_pix_white ; YES. + + ; No: write the pixel itself... + movlw .64 ; Max color pixel on a single byte. + cpfsgt ds_count ; Skip if count > 64 + movf ds_count,W ; W <- min(64,count) + subwf ds_count,F ; ds_count <- ds_count-W + decf WREG ; Save as 0..63 + iorlw b'10000000' ; MARK as a color pixel. + + movwf TXREG + call rs232_wait_tx ; wait for UART movff ds_pixel+1,TXREG - call rs232_wait_tx ; wait for UART + call rs232_wait_tx ; wait for UART movff ds_pixel+0,TXREG - call rs232_wait_tx ; wait for UART - movff ds_count,TXREG - call rs232_wait_tx ; wait for UART + call rs232_wait_tx ; wait for UART + bra dump_screen_pixel_1 dump_screen_pixel_2: movff PRODH,ds_pixel+1 ; Save new pixel color @@ -165,6 +187,26 @@ movwf ds_count ; And set count=1. return +dump_screen_pix_black: + movlw .128 ; Max black pixel on a single byte. + cpfsgt ds_count ; Skip if count > 128 + movf ds_count,W ; W <- min(128,count) + subwf ds_count,F ; ds_count <- ds_count-W + decf WREG ; Save as 0..127 +dump_screen_pix_3: + movwf TXREG + call rs232_wait_tx + bra dump_screen_pixel_1 ; More to dump ? + +dump_screen_pix_white: + movlw .64 ; Max white pixel on a single byte. + cpfsgt ds_count ; Skip if count > 64 + movf ds_count,W ; W <- min(64,count) + subwf ds_count,F ; ds_count <- ds_count-W + decf WREG ; Save as 0..63 + iorlw b'11000000' ; MARK as a compressed white. + bra dump_screen_pix_3 + dump_screen_pixel_flush: clrf PRODH clrf PRODL