Using an spi digipot

[Frederico Alves de Oliveira Silva]

Hello,

I am a total newbie with BeagleBone Black.

Is there a minimal example of how to work with spi digipots?

Thank you for the attention!

Frederico

[amf]

Please provide which digipot your looking at using, there are spi, i2c, and some custom types like microchip.

[Frederico Alves de Oliveira Silva]

Hello amf,

I am using a MCP41010. It is an SPI digipot  with a total resistence of 10 kOhm.

[amf]

look at spidev in linux/Documentation/spi

this is a generic spi driver

The Linux kernel (4.9.x) that I'm using does not have a driver for this device

You will need to add an overlay to associate the spidev with the spi bus that you will be connecting the device to, this link shows you how to do this.

https://learn.adafruit.com/introduction-to-the-beaglebone-black-device-tree/device-tree-overlays

Make sure you only power this device with 3.3 volts, that is what beaglebone black's pins use

You have a lot of learning here, good luck