62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
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#define MPU401_VERSION 0x15
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#define MPU401_REVISION 0x01
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#define MPU401_QUEUE 32
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#define MPU401_TIMECONSTANT (60000000/1000.0f)
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#define MPU401_RESETBUSY 27.0f
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typedef enum MpuMode { M_UART,M_INTELLIGENT } MpuMode;
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typedef enum MpuDataType {T_OVERFLOW,T_MARK,T_MIDI_SYS,T_MIDI_NORM,T_COMMAND} MpuDataType;
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/* Messages sent to MPU-401 from host */
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#define MSG_EOX 0xf7
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#define MSG_OVERFLOW 0xf8
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#define MSG_MARK 0xfc
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/* Messages sent to host from MPU-401 */
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#define MSG_MPU_OVERFLOW 0xf8
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#define MSG_MPU_COMMAND_REQ 0xf9
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#define MSG_MPU_END 0xfc
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#define MSG_MPU_CLOCK 0xfd
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#define MSG_MPU_ACK 0xfe
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typedef struct mpu_t
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{
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int intelligent;
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MpuMode mode;
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int irq;
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uint8_t status;
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uint8_t queue[MPU401_QUEUE];
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int queue_pos,queue_used;
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struct track
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{
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int counter;
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uint8_t value[8],sys_val;
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uint8_t vlength,length;
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MpuDataType type;
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} playbuf[8],condbuf;
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struct {
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int conductor,cond_req,cond_set, block_ack;
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int playing,reset;
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int wsd,wsm,wsd_start;
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int run_irq,irq_pending;
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int send_now;
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int eoi_scheduled;
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int data_onoff;
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uint32_t command_byte,cmd_pending;
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uint8_t tmask,cmask,amask;
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uint16_t midi_mask;
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uint16_t req_mask;
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uint8_t channel,old_chan;
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} state;
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struct {
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uint8_t timebase,old_timebase;
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uint8_t tempo,old_tempo;
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uint8_t tempo_rel,old_tempo_rel;
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uint8_t tempo_grad;
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uint8_t cth_rate,cth_counter;
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int clock_to_host,cth_active;
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} clock;
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} mpu_t;
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void mpu401_init(mpu_t *mpu, uint16_t addr, int irq, int mode);
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