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delay slot filling

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This commit is contained in:
Edward R. Gonzalez
2025-08-04 21:56:44 -04:00
parent 48b8a68d9e
commit 92f549dbf5
1 changed files with 5 additions and 4 deletions
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code/graphics_system/hello_logo.s
+5 -4
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@@ -37,7 +37,7 @@ main:
; Setup Display Control
gcmd_push gp1, rtmp_1, gp_Reset
gcmd_push gp1, rtmp_1, gp_DisplayEnabled
gcmd_push gp1, rtmp_1, gp_DisplayMode | gp_Disp_Color15 | gp_Disp_VInterlace | gp_Disp_VRes_480 | gp_Disp_HRes_640
gcmd_push gp1, rtmp_1, gp_DisplayMode | gp_Disp_Color24 | gp_Disp_VInterlace | gp_Disp_VRes_480 | gp_Disp_HRes_640
// gcmd_push gp1, rtmp_1, gp_DisplayMode_320x240_15bit_NTSC
// gcmd_push gp1, rtmp_1, gp_DisplayMode_640x480_24bbp_NTSC
gcmd_push gp1, rtmp_1, gp_HorizontalDisplayRange_3168_608
@@ -58,9 +58,10 @@ main:
shift_rl @id, @id, (word / 2)
load_addr @img_cursor, Image
loop_dma:
load_word rtmp_1, (@img_cursor) :: nop :: store_word rtmp_1, gp0 ; @img_curor -> gp_dma_cpu_vm(word)
add_si @img_cursor, @img_cursor, word ; @img_cursor ++
add_ui @id, @id, -1 :: branch_ne_zero @id, loop_dma :: nop ; @id -- :: if != @id, 0 goto loop_dma
load_word rtmp_1, (@img_cursor)
add_si @img_cursor, @img_cursor, word ; @img_cursor ++ (delay slot filled)
store_word rtmp_1, gp0 ; @img_curor -> gp_dma_cpu_vm(word)
branch_ne_zero @id, loop_dma :: add_ui @id, @id, -1 ; if != @id, 0 goto loop_dma :: -- @id (delay slot filled)
idle:
jump idle :: nop