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SigmaDSP Processors and SigmaStudio Development Tool
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SigmaDSP Processors and SigmaStudio Development Tool
Documents Updating SigmaDSP Parameter with a Microcontroller
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SigmaDSP Processors and SigmaStudio Development Tool requires membership for participation - click to join
  • Documents
  • 96 kHz operation for ADAU1452 serial ports
  • ADAU1701 Input and Output Signal Routing
  • ADAU1701: ADC resistor values for higher sample rates
  • Booting a SigmaDSP from a microcontroller with no C compiler
  • Calculating Filter Coefficients to Store in a Microcontroller
  • Can ADI provide or support the USB interface firmware code for my self-assembled PCB or end product?
  • Can ADI provide or support the USB interface firmware code for my self-assembled PCB or end product? - 2
  • Can I program multiple SigmaDSPs in parallel using one USBi?
  • Can I use SigmaDSP to decode MP3/WAV/AAC?
  • Can SigmaDSP do frequency-domain processing like FFT or pitch shift?
  • Can the ADAU1772 be used with a TDM output stream that has an odd number of channels?
  • Compressor Table Format - Changing compressors at run-time
  • Creating a delay after startup
  • Creating a simple balance crossfade control
  • E2PROM Selfboot problem
  • Empty Cells
  • EVAL-ADAU144XEBZ Evaluation Board Schematics
  • EVAL-ADAU1781Z GPIO Mapping in SigmaStudio
  • EVAL-ADAU1781Z GPIO Mapping in SigmaStudio - 2
  • Example Project: Using the Stopwatch to Count Successive Samples over a Threshold
  • Excluding Cells from the Exported System Files
  • FAQ: After downloading self-boot code to my target EEPROM, my USBi isn't recognized anymore by my computer. What's wrong and how do I fix it?
  • FAQ: Can I write C or assembly code for SigmaDSP in SigmaStudio?
  • FAQ: Can we bundle SigmaStudio with our product design?
  • FAQ: Developing custom algorithms and/or using 3rd party algorithms
  • FAQ: How can I change parameters on-the-fly in an application without SigmaStudio?
  • FAQ: How can I estimate MIPS/Memory resource on SigmaDSP?
  • FAQ: How do I change the sample rate of my SigmaStudio system?
  • FAQ: What operating systems are supported to run SigmaStudio?
  • FAQ: What types of capacitors are good to use in the analog audio signal path?
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  • FAQ:  Which SigmaDSP ICs support selfbooting from an EEPROM?
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  • How do I execute a software safeload write?
  • How do I implement external volume control using GPIOs or Aux ADCs?
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  • How do I start a timer after power-on, or when the input signal goes away?
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  • How many instructions can be executed per sample in SigmaDSP?
  • How to avoid distortion or clipping on the ADC inputs for the ADAU144x evaluation board
  • How to avoid distortion or clipping on the ADC inputs for the ADAU144x evaluation board - 2
  • How to calculate index table values in 28.0 format
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  • Welcome to the SIGMADSP Processors and SIGMASTUDIO Development tool community
  • What are the mute ramp times in the AD193x codecs?
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  • Workaround: Creating constant-dB envelope decay using an existing linear decay algorithm
  • [bug report] False frequency response displayed in a parametric equalizer window for an IIR coefficient filter
  • [Tutorial] Using Hierarchy Boards to create re-usable code

Updating SigmaDSP Parameter with a Microcontroller

Originally authored by KJBob

     Working with SigmaStudio is like a walk in a beautiful park -- until you say the word microcontroller, then the ground opens up and you fall into the "digital snake pit" underneath.  Once you find your way down there, you'll master booting and controlling your DSP as have many before you.  I'm still not very comfortable down there either.  In spite of this (or perhaps because of it!) here's a bit of help:

    Size of write sequences:  As you found out, there's more activity on the scope than the raw data suggests.  Notice in the capture window that these are safeload writes.  Writing parameters directly to a running DSP's memory causes awful noises, the safeload method avoids that.  It does, however, involve more overhead, reflected in your scope trace.  Safeload is described on pages 30 & 37 of the ADAU1701 data sheet; you can also search for its many references in this forum.  Also, although the DSP takes 28-bit parameters padded to four bytes, actually each of them are five bytes long.  There needs to be a dummy byte in the middle, for reasons described at http://ez.analog.com/thread/6429

    Booting the -1701:  In theory it's possible to self-boot and change to uC control afterward, yet this approach appears roundly discouraged in the forum -- see for example, http://ez.analog.com/message/14318#1431
Thus, I also suggest that you boot the -1701 from your micro.  It may not be as difficult as it first appears.  ADI's orthodox boot method involving C header files and such is designed to boot any SigmaDSP -- fortunately this is a bit more than what some older models need.  At the risk of espousing heresy,  here's a primitive boot procedure:

  • Link-compile-download your design, ignore the error box if no hardware is presently connected.  The Capture Window shows only a few block writes, unlike the dozens that more powerful SigmaDSPs need -- this makes the primitive boot method possible.

  • Select Export System Files from the Actions menu, save them in your project's folder.
  • Open the resulting TxBuffer_IC1 file with Notepad.  Copy to clipboard all the lines between commented lines as shown below -- these are your DSP program instructions.

  • Paste these lines into a byte constant (or equivalent) in your uC source code.
  • Do the same with the  Param  and  IC 1.HWConfiguration blocks.  You now have  byte constants for program, parameters, and HW config in your uC code.

If anyone who has hooked up an Arduino to a SigmaDSP is willing to jump in here, that would be appreciated (I've only used PICs).  Basically you have your Arduino get the DSP's attention over the SPI bus and set up its program memory's base address (0x0000).  Write a loop that block-writes all 5120 bytes to the DSP.  Do the same for the parameters (4096 bytes) and HW controls (24 bytes).  Finally, write 0x00, 0x1C to your 1701's core control register at address 0x081C to enable the DSP core (must maintain core!).

     Best regards,

     Bob

This FAQ was generated from the following discussion: Parameter updates with Microcontroller

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Anonymous

Top Comments

  • BenKB
    BenKB over 7 years ago +2
    Hi Bob, excellent work, you basically did better than AD about documenting this part (as far as I know, this information about booting the DSP from a microcontroller is not available anywhere in AD documentation…
  • BenKB
    BenKB over 7 years ago

    Hi Bob,

    excellent work, you basically did better than AD about documenting this part (as far as I know, this information about booting the DSP from a microcontroller is not available anywhere in AD documentation)

    And about jumping here, it will not be about using Arduino, but using a KissBox OEM CPU. This allows us to boot a SigmaDSP from its local Flash memory, while everything is being controlled over Ethernet (for those being interested, we do that since a long time with SHARC processors, which allows to add RTP-MIDI support to the SHARC)

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