275 lines
4.8 KiB
C
275 lines
4.8 KiB
C
#ifndef __NES_APU_H
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#define __NES_APU_H
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//////////////////////////////////////////////////////////////////////////////////
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//本程序移植自网友ye781205的NES模拟器工程
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//ALIENTEK STM32F407开发板
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//NES APU 驱动代码
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//正点原子@ALIENTEK
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//技术论坛:www.openedv.com
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//创建日期:2014/7/1
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//版本：V1.0
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//////////////////////////////////////////////////////////////////////////////////
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#define APU_SAMPLE_RATE 22050 //APU音频输出为22.050Khz
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#define APU_PCMBUF_SIZE APU_SAMPLE_RATE/60 //44100/60=735 22050/60=367
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#undef NULL
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#define NULL 0
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#ifndef TRUE
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#define TRUE 1
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#endif
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#ifndef FALSE
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#define FALSE 0
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#endif
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/* define this for realtime generated noise */
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#define REALTIME_NOISE
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#define APU_WRA0 0x4000
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#define APU_WRA1 0x4001
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#define APU_WRA2 0x4002
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#define APU_WRA3 0x4003
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#define APU_WRB0 0x4004
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#define APU_WRB1 0x4005
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#define APU_WRB2 0x4006
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#define APU_WRB3 0x4007
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#define APU_WRC0 0x4008
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#define APU_WRC2 0x400A
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#define APU_WRC3 0x400B
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#define APU_WRD0 0x400C
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#define APU_WRD2 0x400E
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#define APU_WRD3 0x400F
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#define APU_WRE0 0x4010
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#define APU_WRE1 0x4011
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#define APU_WRE2 0x4012
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#define APU_WRE3 0x4013
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#define APU_SMASK 0x4015
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/* length of generated noise */
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#define APU_NOISE_32K 0x7FFF
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#define APU_NOISE_93 93
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#define APU_BASEFREQ 1789772.7272727272727272
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/* to/from 16.16 fixed point */
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#define APU_TO_FIXED(x) ((x) << 16)
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#define APU_FROM_FIXED(x) ((x) >> 16)
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/* channel structures */
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/* As much data as possible is precalculated,
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** to keep the sample processing as lean as possible
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*/
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typedef struct rectangle_s
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{
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u8 regs[4];
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u8 enabled;
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int phaseacc;
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int freq;
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int output_vol;
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u8 fixed_envelope;
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u8 holdnote;
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u8 volume;
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int sweep_phase;
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int sweep_delay;
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u8 sweep_on;
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u8 sweep_shifts;
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u8 sweep_length;
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u8 sweep_inc;
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/* this may not be necessary in the future */
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int freq_limit;
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/* rectangle 0 uses a complement addition for sweep
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** increases, while rectangle 1 uses subtraction
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*/
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u8 sweep_complement;
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int env_phase;
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int env_delay;
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u8 env_vol;
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int vbl_length;
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u8 adder;
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int duty_flip;
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} rectangle_t;
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typedef struct triangle_s
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{
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u8 regs[3];
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u8 enabled;
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int freq;
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int phaseacc;
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int output_vol;
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u8 adder;
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u8 holdnote;
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u8 counter_started;
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/* quasi-hack */
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int write_latency;
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int vbl_length;
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int linear_length;
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} triangle_t;
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typedef struct noise_s
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{
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u8 regs[3];
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u8 enabled;
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int freq;
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int phaseacc;
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int output_vol;
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int env_phase;
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int env_delay;
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u8 env_vol;
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u8 fixed_envelope;
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u8 holdnote;
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u8 volume;
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int vbl_length;
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#ifdef REALTIME_NOISE
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u8 xor_tap;
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#else
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u8 short_sample;
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int cur_pos;
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#endif /* REALTIME_NOISE */
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} noise_t;
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typedef struct dmc_s
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{
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u8 regs[4];
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/* bodge for timestamp queue */
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u8 enabled;
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int freq;
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int phaseacc;
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int output_vol;
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u32 address;
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u32 cached_addr;
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int dma_length;
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int cached_dmalength;
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u8 cur_byte;
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u8 looping;
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u8 irq_gen;
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u8 irq_occurred;
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} dmc_t;
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enum //定义枚举变量
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{
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APU_FILTER_NONE,
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APU_FILTER_LOWPASS,
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APU_FILTER_WEIGHTED
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};
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typedef struct
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{
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//u32 min_range, max_range;
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signed long int min_range, max_range;
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u8 (*read_func)(u32 address);
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} apu_memread;
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typedef struct
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{
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//u32 min_range, max_range;
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signed long int min_range, max_range;
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void (*write_func)(u32 address, u8 value);
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} apu_memwrite;
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/* external sound chip stuff */
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typedef struct apuext_s
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{
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void (*init)(void);
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void (*shutdown)(void);
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void (*reset)(void);
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//DCR
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void (*paramschanged)(void);
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int (*process)(void);
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apu_memread *mem_read;
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apu_memwrite *mem_write;
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} apuext_t;
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/* APU queue structure */
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#define APUQUEUE_SIZE 256 //4096
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#define APUQUEUE_MASK (APUQUEUE_SIZE - 1)
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/* apu ring buffer member */
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typedef struct apudata_s
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{
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u32 timestamp, address;
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u8 value;
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} apudata_t;
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typedef struct apu_s
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{
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rectangle_t rectangle[2];
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triangle_t triangle;
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noise_t noise;
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dmc_t dmc;
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u8 enable_reg;
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apudata_t queue[APUQUEUE_SIZE];//APUQUEUE_SIZE
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int q_head, q_tail;
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u32 elapsed_cycles;
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void *buffer; /* pointer to output buffer输出缓冲区指针 */
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int num_samples;
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u8 mix_enable[6];
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int filter_type;
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int cycle_rate;
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int sample_rate;
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int sample_bits;
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int refresh_rate;
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int decay_lut[16];
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int vbl_lut[32];
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int trilength_lut[128];
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/* external sound chip 外部声音芯片*/
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apuext_t *ext;
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} apu_t;
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extern apu_t *apu;
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extern u16 *wave_buffers;
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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extern void apu_init(void);
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extern void apu_setparams(int sample_rate, int refresh_rate, int frag_size,int sample_bits);
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extern void apu_process(u16 *buffer, int num_samples);
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extern void apu_reset(void);
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extern u8 Apu_Read4015(u32 address);
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extern void Apu_Write(u8 value,u32 address);
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void apu_soundoutput(void);
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void apu_write4017(u32 address, u8 value);
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#ifdef __cplusplus
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}
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#endif
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#endif
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