Where can I find example SIO drivers?

Jacob Jennings

I'm beginning on an audio filter application and I'd like to write a DSP/BIOS SIO driver for the I2S peripherals on the c5532, as well as 'stackable devices' representing filters. What would be a good example SIO driver for me to use as a reference?

Application details:

2x I2S in

2X I2S out

Multiple FIR filters, channel mixing

Live updating of FIR coefficients and mixing levels via I2C

Thanks in advance for any advice on approaching this application.

over 7 years ago

0 Lalindra Jayatilleke over 7 years ago

TI__Mastermind 30365 points

Hi Jacob,

Please see this thread https://e2e.ti.com/support/embedded/tirtos/f/355/p/273526/956012

Would the streaming.c file in C:\ti\bios_5_42_00_07\packages\ti\bios\examples get you moving in the right direction?

Another thread https://e2e.ti.com/support/embedded/tirtos/f/355/p/271956/952110 . Hope this helps.

Lali

0 Jacob Jennings over 7 years ago in reply to Lalindra Jayatilleke

Prodigy 40 points

Lalindra,

Thanks for the pointers - this is a good start.

Jake

0 Jacob Jennings over 7 years ago in reply to Jacob Jennings

Prodigy 40 points

According to SPRU616a, the Driver Developer's Kit (DDK) is the right place to start, but DDK has been obsoleted (e2e.ti.com/.../114895) to be replaced by PSP, but c5532 has no PSP support, so I will probably use FreeRTOS instead of DSP/BIOS.

0 Jacob Jennings over 7 years ago in reply to Jacob Jennings

Prodigy 40 points

On second thought, DSP/BIOS will work for my application, although the SIO streaming APIs won't work due to abandoned DDK tools. The PIP pipes will replace SIO, combined with CSL I2S/I2C libraries, TSK tasks, and SEM semaphores

0 Matthew Kendall over 7 years ago in reply to Jacob Jennings

Intellectual 785 points

Swapping SIO for PIP does not remove the need for a device driver for your CODEC. In either case you will want an "IOM Mini-Driver" that talks to the CODEC (probably using the CSL to access the hardware). SIO would talk to it through DIO; PIP would talk to it through PIO.

It is possible to write an IOM Mini-Driver just using the information in SPRU404 and SPRU616. You don't actually need the DDK, although it is still downloadable.

Your driver will probably want to make use of DMA to move the data from I2S to memory, generating an interrupt that the driver can service when you have a full block, and you will probably want to make use of the DMA ping-pong feature so you can service one block while streaming the other to/from I2S. For a full stereo input/output solution you will need to make use of four DMA channels.

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Where can I find example SIO drivers?