22 March 2024, 17:26 | #1 |
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Do sprites display on bootblock process?
I wrote a binary that should display a sprite, I load it from disk bootblock but sprite does not display at all.
Are there some restrictions that I'm not aware about? |
22 March 2024, 17:37 | #2 |
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Have you enabled the appropriate DMA channels and set sprite colors? If you show the code or binary we can tell you exactly what's missing.
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22 March 2024, 17:50 | #3 |
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I bet for bitplane DMA disabled..
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22 March 2024, 19:28 | #4 |
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Code:
************************************* * * * BOOTBLOCK USING TRACKDEVICE * * ************************************* ; WARNING! WriteFlag=1 will write data to disk on df0: ; - In BootBlock, device commands CMD_CLEAR, TH_CHANGENUM and CDM_READ ; can be executed without error ; ; - The boot code is invoked with the I/O request used to issue the device ; command in register A1, with the io_Offset pointing to the beginning of the ; partition (the origin of the boot blocks) and Sysbase in A6 ; ; see also: ; ; http://amigadev.elowar.com/read/ADCD_2.1/Devices_Manual_guide/node007D.html MAIN_ADDRESS = $70000 DoIo = -456 ProgSectors=2 ; program expected size expressed in sectors Writeflag = 1 IF WriteFlag = 1 AUTO WS\BOOTBLOCK\0\ProgSectors+2\CC\ ENDC bootblock: dc.b 'DOS',0 dc.l 0 dc.l 880 bootEntry: lea MAIN_ADDRESS,a5 move.l #(ProgSECTORS)*512,36(a1) ; Length move.l a5,40(a1) ; ReadBuffer move.l #1024,44(a1) ; Offset jsr DoIo(a6) ; execute move.l #0,36(a1) ; motor off move.w #9,28(a1) ; command:MOTOR jsr DoIo(a6) jmp (a5) ; Jmp to sysoff bootEnd: ds.b 1024-(bootEnd-bootBlock) ; fill remaining space ; of first 2 sectors with $00 mainStart: include "vbarscroll.S" mainEnd: ds.b (ProgSectors*512)-(mainEnd-mainStart) ; fill remaining space ; of prog sectors with $00 End PRINTT "BOOTBLOCK REAL SIZE..." PRINTV bootEnd PRINTT "MAIN PROG REAL SIZE..." PRINTV mainEnd-mainStart |
22 March 2024, 20:56 | #5 |
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Code works, but bootblock load code is broken.
(next time please upload the compiled code, too much time wasted to create an environment in which it works, not everyone uses yours) |
22 March 2024, 21:18 | #6 |
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Thank you so very much, next time I will upload the binary
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25 March 2024, 12:06 | #7 |
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Sorry Ross but even with you assembled I still don't get what was wrong with my bb.
What I did it's to put the main program on sector 3, read it using read command (2) on $2c(A1) and load it from address $400 on $70000. The program was correctly loaded apparently so still I don't get where I am wrong . |
25 March 2024, 12:18 | #8 | |
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Quote:
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25 March 2024, 13:16 | #9 |
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Oh I feel silly because I often fall to same errors again and again. In this case I was using non-pc relative addresses so I was pointing to a blank address (that's why from the assembler it worked)
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25 March 2024, 13:51 | #10 | |
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Quote:
Of course the source is useful as an addition, but I would never trust an executable run exclusively within the development environment. |
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25 March 2024, 17:52 | #11 |
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this programline's are 'wrong' assembled:
MOVE.L #Sprite,d0 LEA SpritePointers,a1 spritedata are at adress: $70324, but in program on $70050 is move.l #$00026620,d0 spritepointer starts at adress: $701a6, but in program on $70056 is lea.l $00026594,a1 So wrong addresses while executing, but I don't no why? |
25 March 2024, 21:03 | #12 |
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That's because Program is not located from an hunk, instead it is loaded as a binary data from DoIo function.
If you are not using hunk (for example a NDOS program) then you want to use PC/Ax relative addressing mode so you'll get always the correct address. See also bootblock example on asm one |
25 March 2024, 21:04 | #13 |
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Code:
change this MOVE.L #Sprite,d0 LEA SpritePointers,a1 to this LEA.L Sprite(PC),a0 move.l a0,d0 LEA.L SpritePointers(PC),a1 and then it works, I tested it. |
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