Tone1 as I2S to USB bridge for ADC with I2S output?

Audio
1

Hello,

I am considering buying an ADC with I2S output and I would like to connect the I2S output to Tone1’s I2S input. Is it possible that Tone1 will work as a bridge and send the I2S signal over USB?

If it is not possible out-of-box, then what software or hardware changes would be required?

regards
p.h.

2

Hi przemhb,
The hardware connect can use this pin. need firmware update, but we do not have the plan to update Tone1’s firmware at present.

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3

Hi Kenny,

Thank you for your reply.
So my guess was right - it’s one of a two I2S ports of the XU208.

Tone1 firmware is closed source, isn’t it?

I am considering writing appropriate firmware by myself having xCORE USB Audio library as a starting point. As the firmware could be setup as conformant with USB Audio Class 2 no OS drivers would be needed for modern systems. I have XTAG3 debug interface and my only one Tone1 as an evaluation board.
So I need a way to revert to stock Tone1 firmware to still be able to listen to it once I finish development at the end of a day. Even after clearing the XU208’s Flash (Khadas application and bootloader).

Is there any tool by Khadas or XMOS? I was wondering if you lock or encrypt the flash? Maybe I could read whole flash, store it as a HEX and later flash it back? Xflash?

I have no experience with any XMOS MCU, but I do have with MCU from other manufacturers.

4

Hi przemhb,

The XMOS tool i use is:

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If want to revert to stock Tone1’s firmware(*.xe format) please flow this:

  • Use xTAG tool to connect Tone1’s debug port.

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  • Use Command Prompt tool to revert Tone1’s firmware again.

xflash E:\Tone1_Firmware_V2.00_201016.xe

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5

Hi Kenny,

thank you for the information and firmware xe file. I do appreciate this.

Does the xe file contain whole flash or just an application? I guess the flash map starts with a bootloader and application comes afterwards, starting at some higher address.

6

I was able to program flash. Thank you.

XTAG3 and Khadas use 2x10 connector. At first I was deceived and just matched pin 1.

There are three things to note:

  • pin mapping is different,
  • numbering conventions differ,
  • JTAG signals naming od TDO and TDI is different.
    I have attached screenshots with my comments in case it will help someone.

Khadas Debug to XTAG3 mapping
Khadas Debug to XTAG3 mapping905×306 44.1 KB

1 Like
7

Hi przemhb,
Thanks for your sharing :bouquet:

It contain the whole thing.

have fun :wink: