Public_Skunkworks/sierrahotel
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Added DMA clear. Almost working!

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This commit is contained in:
Scott Duensing 2024-07-21 19:25:51 -05:00
parent ecb49409e7
commit e3c18cdf4b
1 changed files with 64 additions and 0 deletions
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64
src/main.c
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@ -146,6 +146,63 @@
#include "a23d2.h" #include "a23d2.h"
asm (
".text\n"
// " .cpu mosw65c02\n"
// "mos-insns-w65c02\n"
// "EF_MOS_ARCH_W65C02 \n"
".global dmaClear\n"
"dmaClear:\n"
"pha\n"
// "phx\n"
".byte $DA\n"
"php \n" // preserver interrupt state + c
"sei \n" // disable interrupts
"ldy 1 \n" // y = io_ctrl
//"phy \n" // save io_ctrl on stack
".byte $5A\n"
//"stz 1 \n" // map in the dma registers, where we can get them
".byte $64,$01 \n"
//"stz $DF00 \n" // clear dma control
".byte $9c,$00,$DF\n"
"ldy #$05 \n" // DMA_CTRL_ENABLE+DMA_CTRL_FILL
"sty $DF00 \n"
"ldy __rc8 \n" // Fill Color
"sty $DF01 \n" // Fill value
"sta $DF08 \n" // Addr Low
"stx $DF09 \n" // Addr Hi
"lda __rc2 \n" // Addr Bank
"sta $DF0A \n"
"lda __rc4 \n" // length low
"sta $DF0C \n"
"lda __rc5 \n" // length middle
"sta $DF0D \n"
"lda __rc6 \n" // length high
"sta $DF0E \n"
"lda #$80 \n" // DMA_CTRL_START
//"tsb $DF00 \n" // DMA_CTRL
".byte $0C,$00,$DF\n"
"wait: lda $DF01 \n" // DMA_STATUS
"bmi wait \n" // Wait for DMA
//"stz $DF00 \n" // DMA Off
".byte $9c,$00,$DF\n"
"nop \n"
"nop \n"
"nop \n" // wait
"nop \n"
"nop \n"
"nop \n"
"pla \n" // restore the io_ctrl
"sta 1 \n"
"plp \n"
// "plx\n"
".byte $FA\n"
"pla\n"
"rts \n"
);
void dmaClear(uint32_t address, uint32_t length, byte color);
#if 0 #if 0
typedef struct airplaneS { typedef struct airplaneS {
@ -346,6 +403,7 @@ float collectZ = 0;
// This flight model is basically the one from "Build Your Own Flight Sim // This flight model is basically the one from "Build Your Own Flight Sim
// in C++" by Michael Radtke and Chris Lampton. // in C++" by Michael Radtke and Chris Lampton.
void lightPlane(void) { void lightPlane(void) {
@ -603,11 +661,17 @@ void runSimulation(void) {
_drawlist = DRAWLIST_P0; _drawlist = DRAWLIST_P0;
} }
#if 0
// Erase old scene. // Erase old scene.
bitmapSetColor(0); bitmapSetColor(0);
_useColor = false; _useColor = false;
//textPrint("a23d2Draw()\n"); //textPrint("a23d2Draw()\n");
a23d2Draw(); a23d2Draw();
#else
dmaClear(pageZero ? 0x6c000 : 0x58000, 0x12c00, 0);
#endif
// Draw new scene. // Draw new scene.
//textPrint("a23d2Render()\n"); //textPrint("a23d2Render()\n");