I have been working with the audio example from the PSP driver package, with a minimal modification so that it outputs a square wave. The problem is that I see a large amount of noise on the output, its peak to peak voltage is greater than 100 mV.
I have tried both the 01.20.00 and 01.30.01 driver packages with no difference.
There is another question posted 5 years ago regarding this, with no definitive answer - http://e2e.ti.com/support/dsp/omap_applications_processors/f/42/t/29479.aspx?pi301055=2 This thread also suggests writing 0x08 instead of 0x09 (given in the spectrum digital example) to registers 86 and 93 on page zero of the AIC3106 codec chip (the first bit of these registers is read only). Looking a both versions of the driver, 0x09 is written to these registers, however changing these values to 0x08 and recompiling the driver/example does not change anything.
Please suggest a solution to this noise problem.