FreeCalypso > hg > freecalypso-tools

annotate target-utils/buzplayer/melplay.c @ 469:fd4af8023ce6

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CHANGES: null pointer passing fixes documented
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 11 Feb 2019 22:51:17 +0000
parents 8a200d65c6a0
children 158dd05fb9f9
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1 #include "types.h"
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2 #include "melody.h"
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3
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4 extern struct melentry *melody_buf_start, *melody_buf_tailptr;
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5
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6 #define ARMIO_LOAD_TIM (*(volatile u16 *) 0xFFFE4808)
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7 #define BUZZ_LIGHT_REG (*(volatile u16 *) 0xFFFE480E)
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8
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9 void
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10 melody_play()
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11 {
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12 struct melentry *p;
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13 int count;
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14
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15 wait_for_tdma_frame();
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16 for (p = melody_buf_start; p < melody_buf_tailptr; p++) {
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17 if (p->tone) {
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18 ARMIO_LOAD_TIM = p->tone;
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19 BUZZ_LIGHT_REG = 1;
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20 } else
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21 BUZZ_LIGHT_REG = 0;
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22 for (count = p->dur; count; count--)
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23 wait_for_tdma_frame();
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24 BUZZ_LIGHT_REG = 0;
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25 }
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26 }