espp SPI driver

[ntremble-sst]

Is your feature request related to a problem?

Espp has an I2C driver referenced via i2c.hpp, see for example the ICM42607 example project, and the actual component espp/i2c.

The espp/base_peripheral already claims to support I2C and SPI/SSI:

"It is primarily designed to be used as a base class for peripheral classes that communicate using I2C (address-based) or SPI/SSI (CS-based) protocols."

but I cannot locate any SPI equivalent to espp/i2c.

I am working on a product containing an ICM42670P IMU which is SPI connected. The espp/icm42607 driver looks interesting, but it is for an I2C connected device.

Describe the solution you'd like.

I would like to be able to use code simliar to the ICM42607 example to communcate with an ICM42670P IMU over SPI at 20MHz.

It seems that the only thing preventing this is the missing espp/spi component. I would like this component to be made available and officially supported.

Do you have any plans in the near term to implement an SPI driver for this framework?

I am using IDF 6.1.0 at this point, though that is flexible.

Describe alternatives you've considered.

I could create my own modeled on espp/i2c, after all I do not require the CLI interface etc. but I would prefer to use an officially supported version.

Additional context.

No response

[finger563]

Hi @ntremble-sst while there isnt an equivalent for SPI of esp/i2c, the base peripheral can be used with native esp-idf spi driver objects and lambda captures. Some of the examples and other repositories in esp-vpp show this functionality. Later, when I'm back to my computer, I will look back through and find which ones explicitly do - and if there's not a good one I'll provide some simple code showing it but it's probably only 10-20 loc depending on what you need to configure for the spi. Because of the difference configurations and considerations I have not yet made an esp class wrapping the spi since it's more configurable and requires supporting a much wider range of use cases than i2c.

[ntremble-sst]

Thank you.
I did look through the whole of espp and while I found various things that claimed SPI ability, they were all implemented on espp::I2C. I did find the MT6701 component which had some SSI bits present, but was still set up for I2C.

I would welcome any input you might have to help me get the SPI going.

As an aside, the eth esp_vfs_console component required by espp/i2c via espp/cli has been changed to esp_stdio in the IDF master branch, and maybe all 6.x. I had to change the espp/cli CMakeLists.txt to require "vfs esp_stdio" in place of "vfs esp_vfs_console" to get it to build. Also, some changes are required to cli to account for these changes. I will move back to an earlier IDF version for now to avoid needing to change these files.