boards/hifive1b: SiFive HiFive1 rev B no I2C & SPI

[mrusme]

Description

Even though (according to the specs) the HiFive1 revB does provide I2C and SPI, they don't seem to be implemented and enabled yet in RIOT.

Useful links

• Specs
• Zephyr repo

[mrusme]

@kenrabold do you happen to know about the implementation of I2C and SPI on the HiFive? Maybe you can help out here quickly? :-)

[kenrabold]

I actually have a PR ready for SPI and PWM. I just need to test it out a little more.
I'm also working on I2C, but that will take a little longer.
So, those drivers are coming soon

[mrusme]

@kenrabold need help on testing? If so, point me to the PR and I can test it as well. SPI is something I could use right away. Could also test PWM with a couple of motors.

[kenrabold]

I tested the PWM driver with the built in tri-color LED on the HiFive 1B, so I'm pretty confident that works. I also started getting the SPI interface to the ESP32-SOLO WiFi module on the HiFive1 1B going with commands and responses, but I don't have the complete handshake working yet. I wanted to connect up a different SPI module (RF reader), but haven't had the time to implement and fully test it out.

PWM and SPI driver PR: https://github.com/kenrabold/RIOT/tree/spi

[fjmolinas]

SPI and I2C is now supported since #12946 and #12957 got in, both in 2020.01 release.