XCore Exchange

• MP3 decoding on a single core
• High quality PWM DAC (based on XMOS ClassD reference code)
• SPI Wi-Fi driver for ZeroG (Microchip) Wi-Fi module
• uIP networking stack

'WiPhonic' was a group project as part of the third year Computer Science & Electronics course at University of Bristol. See http://www.cs.bris.ac.uk/ for more information about the university and course.

The aim of the project was to design a product capable of streaming lossy audio from a PC over Wi-Fi to an XMOS-based device that can be connected to an existing powered speaker for maximum flexibility. The product specification was driven by cost, hence the decision to utilise a PWM audio DAC. MP3 decoding is done in real time on the chip.

A Java application running on the PC uses a unique method of parsing the MP3 file into packets. This reduces the buffer overhead on the XMOS and is more resilient to the audio effects of packet loss.

A final product could be implemented on an L2 with a small added BOM. An external DAC could be added for higher quality audio.

leon_heller wrote:I just downloaded it; it's a nice piece of work. However, I had a stack problem when I tried building it with the current tools (10.4.1):

Constraint check for node 0, core 3:
Stack available: <00000000, used: 00000e5c . FAILED
Threads available: 8, used: 1 . OKAY
Timers available: 10, used: 0 . OKAY
Chanends available: 32, used: 4 . OKAY
Error: Constraints check FAILED for node 0, core 3.
xmake: *** [Wiphoria.xe] Error 1

Also, the IDE is showing some syntax errors that I don't understand. They don't affect the compilation.