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cc65/include/_sid.h
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C

/*
* _sid.h
*
* Ullrich von Bassewitz, 22.09.1998
*
* Internal include file, do not use directly.
*
*/
#ifndef __SID_H
#define __SID_H
/* Define a structure with the sid register offsets */
struct __sid_voice {
unsigned freq; /* Frequency */
unsigned pw; /* Pulse width */
unsigned char ctrl; /* Control register */
unsigned char ad; /* Attack/decay */
unsigned char sr; /* Sustain/release */
};
struct __sid {
struct __sid_voice v1; /* Voice 1 */
struct __sid_voice v2; /* Voice 2 */
struct __sid_voice v3; /* Voice 3 */
unsigned flt_freq; /* Filter frequency */
unsigned char flt_ctrl; /* Filter control register */
unsigned char amp; /* Amplitude */
unsigned char ad1; /* A/D converter 1 */
unsigned char noise; /* Noise generator */
unsigned char read3; /* Value of voice 3 */
};
/* End of _sid.h */
#endif