[sdiy] Microchip DSP kit $60 > AVR32
ebrombaugh at earthlink.net
Fri Mar 21 19:53:35 CET 2008
Scott Gravenhorst wrote:
>>> It has 4 stereo ins and four stereo
>>> outs, and optical digital in/out if you want it.
>> Is that last one for MIDI?
> Ack! How could I miss that?
> Thanks Mr. Tellason, I hereby "un-poo".
> A digital in would do nicely, especially if the board has something that does the UART
> thing in hardware or if the MPU/CPU/MCU has a built in general purpose UART. I don't like
> to use a processor to do the serial bit shift thing, I prefer a real UART so that the
> CPU/MPU/MCU isn't burdened with that.
As mentioned earlier, the optical capabilities of the Soundbite board
don't include MIDI. The DSP56371 processor on the Soundbite doesn't have
a UART either, so you'd either have to use an external processor to
handle the MIDI interface and send the results in via SPI, or you'd need
to bit-bang the UART function (Ugh!).
Available peripherals on the processor are:
— 2x Enhanced Serial Audio Interface (ESAI): up to 4 receivers and up to
6 transmitters (per each), master or slave. I2S, Left justified, Right
justified, Sony, AC97, network and other programmable protocols.
— Serial Host Interface (SHI): SPI and I2C protocols, multi master
capability in I2C mode, 10-word receive FIFO, support for 8, 16 and
— Triple Timer module (TEC).
— 11 dedicated GPIO pins
— Digital Audio Transmitter (DAX): 1 serial transmitter capable of
supporting the SPDIF, IEC958, CP-340 and AES/EBU digital audio formats.
— Pins of unused peripherals (except SHI) may be programmed as GPIO lines.
The low GPIO count and Serial Host Interface should be a clue that the
intended purpose for this part was as a simple stand-along DSP, or as a
peripheral to another processor which sends it commands via the SHI. If
I were doing MIDI with this, that's where I'd start.
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