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265 lines
13 KiB
Plaintext
265 lines
13 KiB
Plaintext
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----------------------------------------------------------------------
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DOCUMENT:
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PROGRAMMING DIFFERENCES BETWEEN SOUND MASTER II AND SOUND BLASTER
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FOR RECORDING AND PLAYBACK OF VOICE (DMA AND NON-DMA MODES)
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Version 1.0
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April 2, 1991
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Programming and Documentation by Ryan Hanlon
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Copyright (c) 1991, Covox, Inc. All Rights Reserved
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----------------------------------------------------------------------
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QUICK COMPARISON
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---------------------------------------------------------
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SOUND MASTER II SOUND BLASTER
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---------------------------------------------------------
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BASE PORTS 0x0220, 0x0240, 0x0210, 0x0220, 0x0230
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0x0280, 0x02C0 0x0240, 0x0250, 0x0260
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---------------------------------------------------------
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BASE PORT 8254 TIMER 0 = 0x08 RESET = 0x06
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OFFSET 8254 TIMER 1 = 0x09 READ DATA = 0x0A
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8254 TIMER 2 = 0x0A WRITE COMMAND/DATA = 0x0C
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8254 CONTROL = 0x0B WRITE BUFFER STATUS = 0x0C
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CLEAR IRQ = 0x0C DATA AVAILABLE STATUS = 0x0E
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DISABLE VMDMA = 0x0D
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ENABLE VMDMA = 0x0E
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DAC OFFSET = 0x0F
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---------------------------------------------------------
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MAXIMUM INPUT (ADC) 25KHz INPUT (ADC) 13KHz
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I/O RATES OUTPUT (DAC) 100KHz OUTPUT (DAC) 13KHz
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(8 bit only)
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---------------------------------------------------------
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DATA 2 bit, 3 bit, 4 bit 2 bit, 3 bit, 4 bit
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true ADPCM (high quality) differential PCM (not ADPCM)
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COMPRESSION optional silence encoding optional silence encoding
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---------------------------------------------------------
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AVAILABLE 3, 4, 5, 6, 7 2, 3, 5, 7
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IRQ'S
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---------------------------------------------------------
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COMMANDS N/A 8 BIT DAC OUTPUT = 0x10
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8 BIT ADC INPUT = 0x20
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8 BIT DMA INPUT = 0x24
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8 BIT DMA OUTPUT = 0x14
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2 BIT DMA OUTPUT = 0x16
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2 BIT DMA REFERENCE = 0x17
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2.6 BIT DMA OUTPUT = 0x76
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2.6 BIT DMA REF. = 0x77
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4 BIT DMA OUTPUT = 0x74
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4 BIT DMA REFERENCE = 0x75
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HALT DMA = 0xD0
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CONTINUE DMA = 0xD4
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SET TIME CONSTANT = 0x40
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MULTI-CHANNEL DAC = 0x6?
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TURN ON SPEAKER = 0xD1
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TURN OFF SPEAKER = 0xD3
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CARD IDENTIFICATION = 0xE0
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GET DSP VERSION NUM = 0xE1
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----------------------------------------------------------------------
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NON-DMA INPUT OF 8 BIT PCM SOUND DATA
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SOUND MASTER II SOUND BLASTER
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--------------------------- --------------------------------
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INITIALIZE SM II FOR INPUT INITIALIZE THE DSP FOR INPUT OF PCM DATA
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1. Set up timing method. 1. Reset the DSP chip by writing a '1'
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to the RESET PORT (offset 0x06).
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2. Wait 3 micro-seconds.
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3. Write a '0' to the RESET PORT.
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4. Insure that the DSP was initialized
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by polling for '0xAA' at the READ
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DATA PORT (offset 0x0A)
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5. Wait for the MSB of the WRITE DATA
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COMMAND PORT (offset 0x0C) to equal
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0.
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6. Write 0xD3 command (TURN OFF SPEAKER)
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to the WRITE DATA/COMMAND PORT.
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7. Set up timing method.
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INPUT PCM DATA FROM SM II INPUT PCM DATA FROM DSP
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2. Read byte of PCM data 8. Wait for the MSB of the WRITE DATA/
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from DAC PORT (offset COMMAND PORT (offset 0x0C) to equal
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0x0F). 0.
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3. Wait for correct timing 9. Write 0x20 command (8 BIT ADC INPUT)
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and repeat step 2 until to the WRITE DATA/COMMAND PORT.
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end of transfer. 10. Wait for the MSB of the WRITE DATA/
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COMMAND PORT (offset 0x0C) to equal
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1.
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11. Read byte of PCM data from the READ
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DATA PORT (offset 0x0A).
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12. Wait for correct timing and repeat
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steps 8 through 11 until end of
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transfer.
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----------------------------------------------------------------------
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NON-DMA OUTPUT OF 8 BIT PCM SOUND DATA
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SOUND MASTER II SOUND BLASTER
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--------------------------- --------------------------------
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INITIALIZE SM II FOR OUTPUT INITIALIZE THE DSP FOR OUTPUT OF PCM DATA
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1. Set up timing method. 1. Reset the DSP chip by writing a '1'
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to the RESET PORT (offset 0x06).
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2. Wait 3 micro-seconds.
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3. Write a '0' to the RESET PORT.
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4. Insure that the DSP was initialized
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by polling for '0xAA' at the READ
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DATA PORT (offset 0x0A)
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5. Wait for the MSB of the WRITE DATA
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COMMAND PORT (offset 0x0C) to equal
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0.
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6. Write 0xD1 command (TURN ON SPEAKER)
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to the WRITE DATA/COMMAND PORT.
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7. Set up timing method.
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OUTPUT PCM DATA FROM SM II INPUT PCM DATA FROM DSP
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2. Read byte of PCM data 8. Wait for the MSB of the WRITE DATA/
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from DAC PORT (offset COMMAND PORT (offset 0x0C) to equal
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0x0F). 0.
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3. Wait for correct timing 9. Write 0x10 command (8 BIT ADC OUTPUT)
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and repeat step 2 until to the WRITE DATA/COMMAND PORT.
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end of transfer. 10. Wait for the MSB of the WRITE DATA/
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COMMAND PORT (offset 0x0C) to equal 1.
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11. Write a byte of PCM data to the WRITE
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DATA/COMMAND PORT (offset 0x0C).
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12. Wait for correct timing and repeat
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steps 8 through 11 until end of
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transfer.
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----------------------------------------------------------------------
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DMA INPUT OF 8 BIT PCM SOUND DATA
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SOUND MASTER II SOUND BLASTER
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--------------------------- --------------------------------
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INITIALIZE THE SM II FOR INPUT INITIALIZE THE DSP FOR INPUT OF PCM DATA
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1. Disable VMDMA on the sm II 1. Reset the DSP chip by writing a '1'
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by writting any value to to the RESET PORT (offset 0x06).
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the DISABLE VMDMA PORT 2. Wait 3 micro-seconds.
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(offset 0x0D). 3. Write a '0' to the RESET PORT.
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4. Insure that the DSP was initialized
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by polling for '0xAA' at the READ
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DATA PORT (offset 0x0A)
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5. Wait for the MSB of the WRITE DATA
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COMMAND PORT (offset 0x0C) to equal
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0.
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6. Write 0xD3 command (TURN OFF SPEAKER)
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to the WRITE DATA/COMMAND PORT.
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2. Setup 8237 DMA controller 7. Setup 8237 DMA controller and IRQ
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and IRQ handlers. handlers.
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3. Write control byte to the 8. Wait for the MSB of the WRITE DATA
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8254 controller on the COMMAND PORT to equal 0.
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SM II. 9. Write 0x40 command (SET TIME CONSTANT)
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4. Write LSB of the input rate to the WRITE DATA/COMMAND PORT.
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to the 8254 on the SM II. 10. Wait for the MSB of the WRITE DATA
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5. Write MSB of the input rate COMMAND PORT to equal 0.
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to the 8254 on the SM II. 11. Write one byte value to WRITE DATA/
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COMMAND PORT for desired input rate.
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6. Enable VMDMA on the SM II 12. Wait for the MSB of the WRITE DATA
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by writing any value to the COMMAND PORT to equal 0.
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ENABLE VMDMA PORT (offset 13. Write 0x24 command (8 BIT DMA INPUT)
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0x0E). to the WRITE DATA/COMMAND PORT.
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----------------------------------------------------------------------
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DMA OUTPUT OF 8 BIT PCM SOUND DATA
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SOUND MASTER II SOUND BLASTER
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--------------------------- --------------------------------
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INITIALIZE THE SM II FOR OUTPUT INITIALIZE THE DSP FOR OUTPUT OF PCM DATA
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1. Disable VMDMA on the sm II 1. Reset the DSP chip by writing a '1'
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by writting any value to to the RESET PORT (offset 0x06).
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the DISABLE VMDMA PORT 2. Wait 3 micro-seconds.
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(offset 0x0D). 3. Write a '0' to the RESET PORT.
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4. Insure that the DSP was initialized
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by polling for '0xAA' at the READ
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DATA PORT (offset 0x0A)
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5. Wait for the MSB of the WRITE DATA
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COMMAND PORT (offset 0x0C) to equal
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0.
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6. Write 0xD2 command (TURN ON SPEAKER)
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to the WRITE DATA/COMMAND PORT.
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2. Setup 8237 DMA controller 7. Setup 8237 DMA controller and IRQ
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and IRQ handlers. handlers.
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3. Write control byte to the 8. Wait for the MSB of the WRITE DATA
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8254 controller on the COMMAND PORT to equal 0.
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SM II. 9. Write 0x40 command (SET TIME CONSTANT)
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4. Write LSB of the input rate to the WRITE DATA/COMMAND PORT.
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to the 8254 on the SM II. 10. Wait for the MSB of the WRITE DATA
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5. Write MSB of the input rate COMMAND PORT to equal 0.
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to the 8254 on the SM II. 11. Write one byte value to WRITE DATA/
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COMMAND PORT for desired input rate.
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6. Enable VMDMA on the SM II 12. Wait for the MSB of the WRITE DATA
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by writing any value to the COMMAND PORT to equal 0.
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ENABLE VMDMA PORT (offset 13. Write 0x14 command (8 BIT DMA OUTPUT)
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0x0E). to the WRITE DATA/COMMAND PORT.
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