117 lines
18 KiB
C
117 lines
18 KiB
C
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#include <stdlib.h>
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#include <string.h>
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#include "cv.h"
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#include "cvu.h"
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#define PATTERN ((const cv_vmemp)0x0000)
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#define COLOR ((const cv_vmemp)0x2000)
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#define IMAGE ((const cv_vmemp)0x1c00)
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uintptr_t __at(0x6a) font_bitmap_a;
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uintptr_t __at(0x6c) font_bitmap_0;
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typedef unsigned char byte;
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typedef unsigned short word;
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volatile bool vint;
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volatile uint_fast8_t vint_counter;
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void vint_handler(void) {
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vint = true;
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vint_counter++;
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}
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void wait_vsync() {
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vint = false;
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while (!vint) ;
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}
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void delay(byte i) {
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while (i--) {
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wait_vsync();
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}
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}
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//
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// MUSIC ROUTINES
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//
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// Namespace(bias=0, freq=1789772.5, length=64, maxbits=15.0, upper=49)
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// 437.0 459.515928524 49
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const int note_table[64] = {
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17356, 32764, 30926, 29190, 27551, 26005, 24546, 23168, 21868, 20640, 19482, 18388, 17356, 32765, 30926, 29190, 27552, 26005, 24546, 23168, 21868, 20640, 19482, 18389, 17357, 16382, 15463, 14595, 13776, 13003, 12273, 11584, 10934, 10320, 9741, 9194, 8678, 8191, 7731, 7298, 6888, 6501, 6136, 5792, 5467, 5160, 4871, 4597, 4339, 4096, 3866, 3649, 3444, 3251, 3068, 2896, 2733, 2580, 2435, 2299, 2170, 2048, 1933, 1824, };
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struct {
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byte volume;
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} voice[3];
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byte music_index = 0;
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byte cur_duration = 0;
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const byte music1[] = {
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|
|
};
|
|
|
|
static const byte* music_ptr = NULL;
|
|
|
|
inline byte next_music_byte() {
|
|
return *music_ptr++;
|
|
}
|
|
|
|
void play_music() {
|
|
byte ch;
|
|
byte freech = 0;
|
|
for (ch=0; ch<3; ch++) {
|
|
if (voice[ch].volume) {
|
|
cv_set_attenuation(CV_SOUNDCHANNEL_0+ch*2, 32-voice[ch].volume--);
|
|
} else {
|
|
freech = ch;
|
|
}
|
|
}
|
|
if (music_ptr) {
|
|
ch = freech;
|
|
while (cur_duration == 0) {
|
|
byte note = next_music_byte();
|
|
if ((note & 0x80) == 0) {
|
|
int period = note_table[note & 63];
|
|
cv_set_attenuation(CV_SOUNDCHANNEL_0+ch*2, 32);
|
|
cv_set_frequency(CV_SOUNDCHANNEL_0+ch*2, period);
|
|
voice[ch].volume = 31;
|
|
ch = ch ? ch-1 : 2;
|
|
} else {
|
|
if (note == 0xff)
|
|
music_ptr = NULL;
|
|
cur_duration = note & 63;
|
|
}
|
|
}
|
|
cur_duration--;
|
|
}
|
|
}
|
|
|
|
void start_music(const byte* music) {
|
|
music_ptr = music;
|
|
cur_duration == 0;
|
|
}
|
|
|
|
void setup_40_column_font() {
|
|
cv_set_image_table(IMAGE);
|
|
cvu_memtovmemcpy(0x1800, (void *)(font_bitmap_0 - 0x30*8), 2048);
|
|
cv_set_character_pattern_t(0x1800);
|
|
cv_set_screen_mode(CV_SCREENMODE_TEXT);
|
|
}
|
|
|
|
void main(void) {
|
|
setup_40_column_font();
|
|
cv_set_colors(CV_COLOR_LIGHT_GREEN, CV_COLOR_BLACK);
|
|
cvu_vmemset(IMAGE, '.', 960);
|
|
cv_set_vint_handler(vint_handler);
|
|
cv_set_screen_active(true);
|
|
while (1) {
|
|
if (!music_ptr) start_music(music1);
|
|
play_music();
|
|
delay(1);
|
|
}
|
|
}
|