As usual the answer to this is in the documentation! https://alsa.opensrc.org/Softvol Note:The new volume control won't appear immediately! Only after the first usage of the newly defined device (e.g. with speaker-test), should amixer sget Softmaster display the new control. Mixers that were already...

I am using the Voice Hat with my own software. The problem I have is that the alsa 'amixer' command returns nothing. No error. Just blank. Following this my python script errors as it is unable to find the Master mixer. The fix for this is to run a speaker-test, and then miraculously the mixer appea...

OK I finally read the data sheet and found the problem! In SPI mode, only 7 bits of the register addresses are used; the MSB of register address is not used and replaced by a read/write bit (RW = ‘0’ for write and RW = ‘1’ for read). Example: address 0xF7 is accessed by using SPI register address 0x...

I did manage to get the PigPio code working, but unfortunately I could not slow the clock down far enough for my needs. I need a very slow clock, because I am running the sensor over a long cable (~ 8m). I think I need to use software bit-banging.

I wonder if anyone has had any success interfacing the Pi to the BME280 over SPI? I can successfully read the chip ID, and the calibration data, but the temp, pressure and humidity always read as [0, 128, 0, 0, 128, 0, 0, 128]. I suspect I am not correctly writing to the control registers to initiat...