Posted on December 02, 2014 at 22:56Hi All,
I try to amplify audio obtained in mic(
mp45dt02
) with amp(
CS43L22 ) and hear the voice on headphones. The way to do this is not with STM32F4, but directly via PDM_OUT port.
This is possible as mic output is directly connected with low-pass filter and amp input afterwards(AIN4A, AIN4B).
The problem is how to configure the amp to such configuration.
Here are some details:
- clock for mic is generated by controller, and I checked with logic analyzer that PDM signal is generated by mic
- I only configure I2C communication (not DMA and I2S) as data loaded from analog input and
CS43L22
is in PASSTHROUGH mode. I can read/write registers of amp but don't know why there is no audio.
Did someone do such configuration and may share registers values?
