Hi,
Does anyone have one of these boards working?
XMOS数字界面板,CPLD波形重整技术-月影科技
They are popular on aliexpress.
I'm using Linux, so no drivers required, and I'm feeding the I2S lines into a ES9028Q2M board which I've verified is working correctly.
And... no output.
Did a quick test of the output pins and have:
Data 3.28v
BCK 1.64v
LRCK 1.64v
MCK 1.64v
Which appears to be correct. A bit stumped.
Aliexpress seller was helpful until the protection ran out, which I didn't catch, then unsurprisingly silent.
Regards,
Andrew
Does anyone have one of these boards working?
XMOS数字界面板,CPLD波形重整技术-月影科技
They are popular on aliexpress.
I'm using Linux, so no drivers required, and I'm feeding the I2S lines into a ES9028Q2M board which I've verified is working correctly.
And... no output.
Did a quick test of the output pins and have:
Data 3.28v
BCK 1.64v
LRCK 1.64v
MCK 1.64v
Which appears to be correct. A bit stumped.
Aliexpress seller was helpful until the protection ran out, which I didn't catch, then unsurprisingly silent.
Regards,
Andrew
Not familiar with Linux, so first things first, are you sure your USB (?) source is 'talking' to the PCB?
Are they talking the same Language? i2S can have a few 'dialects' ! Left Justified etc etc.
Have you a 'scope? Can you actually see some Data and Clocks on the i2S Lines? Those are just DC Voltages you quote which could be there when powered even with no Signal.
Cheers,
P.
Are they talking the same Language? i2S can have a few 'dialects' ! Left Justified etc etc.
Have you a 'scope? Can you actually see some Data and Clocks on the i2S Lines? Those are just DC Voltages you quote which could be there when powered even with no Signal.
Cheers,
P.
Hi, I used a PCM2704 based converter to ensure the DAC (a ES9028Q2M) is working, so the issue is with the XMOS USB-I2S.
For the XMOS, it's recognised fine. I've tested on Linux and Windows with same result so don't think it's a driver issue.
I note the 1.64V lines are the same as the output of the PCM2704 (1.64V is probably the digital on/off averaged by the multimeter). Whether they're talking the same I2S "variant" I'm unsure, but I'd like to hope so.
I don't have a scope but I do have a data recorder good for 20MHz. If I2S lines are less than this I can try capturing. Worth a shot!
For the XMOS, it's recognised fine. I've tested on Linux and Windows with same result so don't think it's a driver issue.
I note the 1.64V lines are the same as the output of the PCM2704 (1.64V is probably the digital on/off averaged by the multimeter). Whether they're talking the same I2S "variant" I'm unsure, but I'd like to hope so.
I don't have a scope but I do have a data recorder good for 20MHz. If I2S lines are less than this I can try capturing. Worth a shot!
If those voltages are what you got from a DVM then the 'Data' voltage looks suspicious (too high), the others are fine (as they're clocks at 50% duty cycle).
Thanks Abraxalito, I agree it initially raised an eye-brow. I've checked and it's not shorted with the 3.3V line. I'll get the data recorder onto it first.
Are they talking the same Language? i2S can have a few 'dialects' ! Left Justified etc etc.
Statements like this simply serve to confuse the issue. There are no dialects. There is I2S replete with its own terminology and there are other serial audio interface formats.
Statements like this simply serve to confuse the issue. There are no dialects. There is I2S replete with its own terminology and there are other serial audio interface formats.
I apologise.
So, how about, instead of just telling me I am wrong, this being an amateur Forum, mostly, why not pass on some of your knowledge and educate us on the different serial data formats.
What, for instance is precisely meant by Left Justified and if a DAC or Receiver IC is set to receive i2S, why will it not work when fed with Left Justified Data.
That might help the OP in finding out why they have no sound.
Cheers,
P.
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