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Re: Reading PDM data @ 2MHz with Raspberry Pi + pigpio (Pyth

Wed Dec 12, 2018 4:17 pm

You are most welcome.
vipinv23 wrote:
Wed Dec 12, 2018 5:03 am
Thanks for response

I shall try 4 bit one

mikronauts wrote:
Tue Dec 11, 2018 5:30 pm
That is because those chips don't have them...

I would use a 4 bit binary counter driven by the shit clock signal, look for a change on q3 (highest bit) which would indicate 8 clock pulses have been seen.

vipinv23 wrote:
Tue Dec 11, 2018 5:05 pm

Thank you very much for the information.
I have read datasheet of both 74hc299 or 74hc595, but in both I could not find data ready (DR) pin.

After the serial bits are converted to parallel bits, how would I come to know that serial-to-parallel conversion is over and parallel data is ready on output pins?

Reference to DR pin in BlockDiagram.jpg - home of EZasPi, RoboPi, Pi Rtc Dio and Pi Jumper @Mikronauts on Twitter
Advanced Robotics, I/O expansion and prototyping boards for the Raspberry Pi

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