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40 lines
1.1 KiB
C
Executable File
40 lines
1.1 KiB
C
Executable File
// A simple SID music player using RASTER IRQ
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#include <c64.h>
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// SID tune at an absolute address
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__address(0x1000) char MUSIC[] = kickasm(resource "toiletrensdyr.sid") {{
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.const music = LoadSid("toiletrensdyr.sid")
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.fill music.size, music.getData(i)
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}};
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typedef void (*PROC_PTR)();
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// Pointer to the music init routine
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PROC_PTR musicInit = (PROC_PTR) MUSIC;
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// Pointer to the music play routine
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PROC_PTR musicPlay = (PROC_PTR) MUSIC+3;
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// Setup Raster IRQ and initialize SID player
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void main() {
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asm { sei }
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(*musicInit)();
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// Disable CIA 1 Timer IRQ
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CIA1->INTERRUPT = CIA_INTERRUPT_CLEAR_ALL;
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// Set raster line to $fd
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VICII->CONTROL1 &=$7f;
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VICII->RASTER = $fd;
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// Enable Raster Interrupt
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VICII->IRQ_ENABLE = IRQ_RASTER;
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// Set the IRQ routine
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*KERNEL_IRQ = &irq_play;
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asm { cli }
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}
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// Raster IRQ Routine playing music
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__interrupt(rom_sys_c64) void irq_play() {
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(VICII->BORDER_COLOR)++;
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// Play SID
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(*musicPlay)();
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// Acknowledge the IRQ
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VICII->IRQ_STATUS = IRQ_RASTER;
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(VICII->BORDER_COLOR)--;
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} |