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by JeremyBirch66
Sun Aug 25, 2019 3:05 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread.
Replies: 925
Views: 463584

Re: STICKY: The I2S sound thread.

here are the exact steps I did (NB I did NOT run rpi-update as that gives a very nasty warning and I think it actually makes things worse...) see https://learn.adafruit.com/adafruit-i2s-mems-microphone-breakout/raspberry-pi-wiring-and-test edit /boot/config.txt to uncomment dtparam=i2s=on sudo nano ...
by JeremyBirch66
Thu Aug 22, 2019 9:31 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread.
Replies: 925
Views: 463584

Re: STICKY: The I2S sound thread.

I may have solved my own query here. Having done this (for the hello world module): sudo apt-get install raspberrypi-kernel-headers make clean make sudo insmod module.ko I no longer get the warning message, lsmod shows the module as being present, and dmesg shows the expected loading message Now to ...
by JeremyBirch66
Thu Aug 22, 2019 9:17 am
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: STICKY: The I2S sound thread.
Replies: 925
Views: 463584

Re: STICKY: The I2S sound thread.

I am also trying to install the I2S module on Pi4 and get: pi@raspberrypi:~/rpi-i2s-audio $ sudo insmod my_loader.ko insmod: ERROR: could not insert module my_loader.ko: Invalid module format I have tried a very simple 'hello world' module and get the same - both of these worked previously on Pi3B+ ...
by JeremyBirch66
Thu Jul 18, 2019 5:50 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: PI 4 SPI seems to be half speed
Replies: 1
Views: 320

PI 4 SPI seems to be half speed

I have been developing a board to plug in to the Pi 3B+ and have just tried it on the Pi 4. The problem I am having is that using identical code I am finding various things that seem to be running at half speed on the Pi 4: 1) the SPI clock when set to run at a given speed (eg 16MHz) actually comes ...

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