kopia lustrzana https://github.com/Jean-MarcHarvengt/MCUME
81 wiersze
3.9 KiB
C
81 wiersze
3.9 KiB
C
/** EMULib Emulation Library *********************************/
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/** **/
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/** SCC.h **/
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/** **/
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/** This file contains definitions and declarations for **/
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/** routines in SCC.c. **/
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/** **/
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/** Copyright (C) Marat Fayzullin 1996-2003 **/
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/** You are not allowed to distribute this software **/
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/** commercially. Please, notify me, if you make any **/
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/** changes to this file. **/
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/*************************************************************/
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#ifndef SCC_H
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#define SCC_H
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#define SCC_BASE 111861 /* Base frequency for SCC */
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#define SCC_CHANNELS 5 /* 5 melodic channels */
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#define SCC_ASYNC 0 /* Asynchronous emulation */
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#define SCC_SYNC 1 /* Synchronous emulation mode */
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#define SCC_FLUSH 2 /* Flush buffers only */
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#ifndef BYTE_TYPE_DEFINED
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#define BYTE_TYPE_DEFINED
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typedef unsigned char byte;
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#endif
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/** SCC ******************************************************/
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/** This data structure stores SCC state. **/
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/*************************************************************/
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typedef struct
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{
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byte R[256]; /* SCC register contents */
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int Freq[SCC_CHANNELS]; /* Frequencies (0 for off) */
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int Volume[SCC_CHANNELS]; /* Volumes (0..255) */
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int First; /* First used Sound() channel */
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byte Changed; /* Bitmap of changed channels */
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byte WChanged; /* Bitmap of changed waveforms */
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byte Sync; /* SCC_SYNC/SCC_ASYNC */
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} SCC;
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/** ResetSCC() ***********************************************/
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/** Reset the sound chip and use sound channels from the **/
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/** one given in First. **/
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/*************************************************************/
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void ResetSCC(register SCC *D,int First);
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/** ReadSCC() ************************************************/
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/** Call this function to read contents of the generic SCC **/
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/** sound chip registers. **/
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/*************************************************************/
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byte ReadSCC(register SCC *D,register byte R);
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/** ReadSCCP() ***********************************************/
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/** Call this function to read contents of the newer SCC+ **/
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/** sound chip registers. **/
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/*************************************************************/
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byte ReadSCCP(register SCC *D,register byte R);
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/** WriteSCC() ***********************************************/
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/** Call this function to output a value V into the generic **/
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/** SCC sound chip. **/
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/*************************************************************/
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void WriteSCC(register SCC *D,register byte R,register byte V);
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/** WriteSCCP() **********************************************/
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/** Call this function to output a value V into the newer **/
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/** SCC+ sound chip. **/
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/*************************************************************/
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void WriteSCCP(register SCC *D,register byte R,register byte V);
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/** SyncSCC() ************************************************/
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/** Flush all accumulated changes by issuing Sound() calls **/
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/** and set the synchronization on/off. The second argument **/
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/** should be SCC_SYNC/SCC_ASYNC to set/reset sync, or **/
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/** SCC_FLUSH to leave sync mode as it is. **/
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/*************************************************************/
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void SyncSCC(register SCC *D,register byte Sync);
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#endif /* SCC_H */
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