introduction

this program is used to drive a DSP like ADAU1452 from Analog Device Sigmastudio GUI; that's useful for rapid development.

this program is supposed to run on a middleman board with these links:

an IP connection toward the PC running Sigma Studio
an I2C bus connected to the DSP board

in my use case, we have running it on a Cubieboard with ARM32 Allwinner A10 SOC running kernel 4.11.xx with buildroot OS (a topic out of scope here..)

this src is loosely based on sample code from: https://wiki.analog.com/resources/tools-software/linux-software/sigmatcp

i've used Sigma Studio 3.14.1 Build 1675 on windows 7 toward an ADAU1452 board

video

you can have a look at my setup and running test here: https://drive.google.com/open?id=0B9QRW6Oy0Gmea2dDNmpIRjZyOVk

usage

it's pretty simple.

clone the repo: git clone https://github.com/aventuri/sigma_tcp.git
cross compile the source in the final single bin sigma_tcp
- eventually adjust the BASEDIR var in Makefile to match your local environment
copy the binary in your SBC root fs
execute as ./sigma_tcp i2c /dev/i2c-1 0x3b, some verbose print tells you about IP and port
get to Sigma Studio, cfg the prj to lookup for IP connection (with param from above)
open connection (the tool will spit out some messages)
link compile download youre DSP design into the DSP (lot's of prints on tool..)

example of this invocation:

 # ./sigma_tcp i2c /dev/i2c-1 0x3b
 Utility for driving ADAU1452 over IP/I2C using SigmaStudio
 License GPL v3 or later
 Andrea Venturi <be17068@iperbole.bo.it>
 
 current development at https://github.com/aventuri/sigma_tcp
 inspired by https://wiki.analog.com/resources/tools-software/linux-software/sigmatcp
 
 Using i2c backend
 i2c: Initalized for device /dev/i2c-1-3b
 Waiting for connections on port 8086...
 IP addresses:
 eth0: 192.168.0.103

test i2c connection

how to connect the board to the Arm SBC is out of scope, here, but you can check it works with a simple test:

 # i2cdetect  -y 1
      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
 00:          -- -- -- -- -- -- -- -- -- -- -- -- -- 
 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
 30: -- -- -- -- -- -- -- -- -- -- -- 3b -- -- -- -- 
 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
 70: -- -- -- -- -- -- -- --

usually the DSP has i2c address 0x3b

devel board

i've been using a pretty cheap board from aliexpress (..of course i've no economic interest with this vendorI). you can find the schematic of this board (together with a daughter board wih ADC/DAC features thanx to AD1938 IC).

community

i gladly invite everybody to test this setup and eventually give me feedback, here in gihub or at this forum thread

i'm course open to hear about custom development, as i have made some pretty experience om this stuff!

next to come

of course the current release is just a working starter.

i plan surely to test if it works ok with another DSP, the ADAU1701 workhorse, as i have another pretty cheap devel board.

if there are other interests, please elaborate!

have fun