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Creative SB0350 Hardware Programming Guide - Page 55

Creative SB0350 Manual

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3-26 Digitized Sound I/O Programming 8-bit or 16-bit Single-cycle Transfer The following are the steps needed to perform 8-bit or 16-bit and mono or stereo PCM single-cycle DMA mode transfer on DSP version 4.xx: 1. 2. 3. Set up the DSP interrupt service routine. Enable the interrupt used. Program the DMA controller for 8-bit or 16-bit single-cycle DMA mode transfer. Set the DSP transfer sampling rate. outp(wSBCBaseAddx+0xC, bCommand) outp(wSBCBaseAddx+0xC, wSamplingRate.HighByte) outp(wSBCBaseAddx+0xC, wSamplingRate.LowByte) 4. bCommand is one of the following: bCommand 42h 41h Description Input Output Contrast the sampling rate with the DSP transfer Time Constant. For example, at a 44100 Hz sampling rate, wSamplingRate.HighByte = ACh, and wSamplingRate.LowByte = 44h. 5. Send an I/O command, followed by the transfer mode, and the data transfer count. outp(wSBCBaseAddx+0xC, outp(wSBCBaseAddx+0xC, outp(wSBCBaseAddx+0xC, outp(wSBCBaseAddx+0xC, bCommand) bMode) wLength.LowByte) wLength.HighByte) bCommand is one of the following: bCommand C8h C0h B8h B0h Description 8-bit input 8-bit output 16-bit input 16-bit output

Section	Page
Introduction	8
What You Should Know	9
Scope and Manual Organization	9
Document Conventions	10
Determining User's Sound Blaster Card	12
Determining User's Card Settings	13
Chapter 1 - Hardware Overview	14
Anatomy of Sound Blaster Family of Audio Cards	15
Digital Sound Processor Chip	15
Mixer Chip	16
FM Synthesizer Chip	16
Bus Interface Chip	17
Advanced Signal Processor Chip	17
Block Diagrams for Sound Blaster Family of Audio Cards	19
Chapter 2 - Introduction to DSP Programming	23
DSP I/O Addresses	24
Resetting DSP	24
Reading from DSP	25
Writing to DSP	26
Handling Interrupts from DSP	26
Sharing of Interrupts	27
Configuring DMA and Interrupt Settings	28
Chapter 3 - Digitized Sound I/O Programming	30
Digitized Sound Operation Modes	31
Digitized Sound Data Format	31
Digitized Sound I/O Transfer Rate	33
Direct Mode	33
Single-cycle DMA Mode	34
Auto-initialize DMA Mode	34
High-Speed DMA Mode	35
ADPCM DMA mode	36
DSP Digitized Sound I/O Capability	37
Digitized Sound Input Capability	39
Sample Procedures	40
General Procedures for a DMA mode Transfer	41
Handling the DSP Digitized Sound I/O Interrupt	41
Chapter 4 - Mixer Chip Programming	59
Programming Sequence	60
CT1335 Mixer	62
Features	62
Register Functions	62
CT1345 Mixer	64
Features	64
Register Functions	65
CT1745 Mixer	68
Features	68
Register Functions	69
Chapter 5 - MIDI Port I/O Programming	76
SB-MIDI Mode	77
I/O Addresses	77
Sending MIDI Data	78
Reading MIDI Data	79
MPU-401 UART Mode	80
I/O Addresses	80
Checking the Status	81
Sending a Command	82
Sending MIDI Data	85
Reading MIDI Data	85
Chapter 6 - DSP Commands	86
Commands by Category	87
Command Descriptions	90
Appendix A - Sound Blaster I/O Address Maps	115
SB1.5 I/O Address Map	116
SBMCV I/O Address Map	117
SB2.0 I/O Address Map	118
SB2CD I/O Address Map	119
SBPRO I/O Address Map	120
SBPRO MCV I/O Address Map	122
SB16 I/O Address Map	123
Appendix B - File Format	125
Creative Voice File (VOC) Format	126
Header Block	126
Data Block	127
Creative ADPCM Wave Type Format	136
Appendix C - Relevant Information	137