FlexiHAL 2350

[andrewmarles]

Just wanted to post some info about the new 2350 based board that we've been working on.

• 15 general inputs (user+limits+ 2 encoders)
• 6 inputs for motor alarm
• 6 outputs for motor enable
• 8 high-current outputs
• 5 high-speed 5V outputs
• 40 points of I/O not including step/dir

We are using both the 2350 and also an RP2040 for I/O expansion. The RP2040 implementation is cheaper than most 8 bit I2C expanders.
For now the expansion is quite simple (just inputs and outputs) but the 2040 should make for some interesting options with the high-speed PWM outputs for things like neopixels, sevos etc with minimal MCU overhead in the motion control.

WIP branch for the PR is here:
https://github.com/Expatria-Technologies/RP2040/tree/flexihal2350-bringup