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Using MSP430 to interface microphone and speaker

Datta Borkar
Prodigy 80 points
Other Parts Discussed in Thread: CC2560

I want to verify whether MSP430 can be used to interface a microphone and a speaker. I am using CC2560 to develop a BLE application and I need to interface the device with the telephone line. I would like to use MSP430, but I was advised to go with (Stellaris) ARM MCUs (as they support larger memory (at least 512KB) and higher frequency, which it seems is a requirement to interface with mic/spkr). But I prefer MSP430 as they are simpler (I am not too familiar with ARM processors). I was wondering if there is a way I can work with MSP430 by using either a codec or some DSP (for example the C5000, the boosterpack). Please let me know. Thank you.

  • 0
    Guru 46710 points

    Sure you can interface mic and speaker, especially using msp430 with hardware DAC and DMA. Main question is - what kind of audio quality you desire and what kind of audio processing you need.

  • 0 in reply to Ilmars
    Prodigy 80 points

    Hi llmars, Thanks for your response. To answer your question ... I am looking for basic audio processing (DTMF output) and I don't need high fidelity. Basically support voice calls i.e. play back the in-coming phone calls (via the speaker) and support outgoing phone calls (via the microphone). I hope this helps, please let me know otherwise. Thanks for all your help!

  • 0 in reply to Datta Borkar
    Guru 46710 points

    So far it seems you can do everything you want using msp430.

  • 0 in reply to Ilmars
    Prodigy 80 points

    Hi llmars, Thanks for your prompt response ... Please pardon me for repeating, but just to confirm ... so if I want to use CC2560 and interface a microphone and a speaker (so that I can process incoming and outgoing calls) I should be fine using the low power MSP430 microcontroller, I need not use an ARM processor (which has larger memory and higher frequency). If yes, then I guess I am all set. Thank you.

  • 0 in reply to Datta Borkar
    Guru 46710 points

    Datta Borkar said:
    so if I want to use CC2560 and interface a microphone and a speaker (so that I can process incoming and outgoing calls) I should be fine using the low power MSP430 microcontroller, I need not use an ARM processor (which has larger memory and higher frequency)

    If your application is mono voice having sample rate <= 8ksps and you don't intend to do extensive DSP math on audio samples, then yes. Thou I recommend to use chip having hardware DAC and DMA.

  • 0 in reply to Ilmars
    Prodigy 80 points

    Hi llmars, Thanks a lot for your advise! I will look into getting a hardware chip having DAC and DMA.

  • 0 in reply to Datta Borkar
    Guru 46710 points

    Datta Borkar said:
    Hi llmars, Thanks a lot for your advise! I will look into getting a hardware chip having DAC and DMA.

    It's easy if you use parametric search. 1-series also have DAC.

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