mirror of
https://github.com/sehugg/8bitworkshop.git
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73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
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#include <conio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <peekpoke.h>
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#include <string.h>
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#include <c64.h>
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#include <cbm_petscii_charmap.h>
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#include "sidmacros.h"
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#include "common.h"
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//#link "common.c"
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void digi_setup(void) {
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SID.v1.sr = 0xFF; // Voice 1 Sustain/Release
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SID.v2.sr = 0xFF; // Voice 2 Sustain/Release
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SID.v3.sr = 0xFF; // Voice 3 Sustain/Release
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SID.v1.ctrl = 0x49; // Voice 1 Control Register
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SID.v2.ctrl = 0x49; // Voice 2 Control Register
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SID.v3.ctrl = 0x49; // Voice 3 Control Register
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}
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void cia2_wait() {
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byte timer = CIA2.ta_lo;
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while (CIA2.ta_lo < timer) ;
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}
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void digi_play(const char* snd, unsigned int len) {
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unsigned int i; // loop counter
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VIC.ctrl1 = 0; // disable video
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asm("sei"); // disable interrupts
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// setup CIA #2 timer
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CIA2.cra = 0x00; // stop timer A
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CIA2.ta_lo = IS_PAL() ? 123 : 128; // set lower timer value
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CIA2.ta_hi = 0; // set upper timer value
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CIA2.cra = 0x11; // start timer, continuous mode
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// loop through all samples
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for (i = 0; i < len; i++) {
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// wait for timer to reset
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cia2_wait();
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// send upper 4-bit sample
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SID.amp = snd[i] >> 4;
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// wait for timer to reset
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cia2_wait();
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// send lower 4-bit sample
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SID.amp = snd[i] & 15;
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// make a video effect
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VIC.bordercolor = i;
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}
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asm("cli"); // enable interrupts
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VIC.ctrl1 = 0x1b; // enable video
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CIA2.cra = 0x00; // stop timer A
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VIC.bordercolor = COLOR_BLUE;
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}
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#ifdef __MAIN__
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const char digisound[] = {
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#embed "springchicken-b4.raw"
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};
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void main(void) {
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clrscr();
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digi_setup();
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while (1) {
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digi_play(digisound, 0xacf8L);
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printf("\nPress ENTER to restart digi...\n");
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getchar();
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}
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}
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#endif
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