Another 1787 PDM question please
I'm trying to implement a very simple setup: PDM mic inputs on the ADAU1787 eval board to an analogue output, see this project:1787 PDM TEST.dspproj
Problem is it isn't working. I've read the previous conversation with Harishsharma and tried to include all the advice therein, but when I have a hunt around with a'scope I notice there's mo clock signal on the DMIC header - any idea why this should be please?
software
ADAU1787
pdm microphone
Integrated/Special Purpose A/D Converters
SigmaStudio 4.6
Audio CODECs
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dunmail,
Looking at the project, there are a couple of points I'd like to review:
1) If the DMIC_CLK0 is not present, then there could be an issue with the internal MCLK. The DMIC clock output is generated from the internal clock. On the "READ_ONLY" tab, are you able to read back a PLL_LOCK?
2) In the "POWER_CTRL" tab, the PB0_EN and PB1_EN bits are OFF. These need to be set to ON in order to enable the DAC output playback path.
3) For both the "DAC_CTRL" and the "DMIC_CTRL" tabs, the DMICs and DAC outputs are currently muted.
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