DO NOT MERGE WIP. Add support for external SPI ADC on rp2040 and rp2350#65

Draft

thomasfla wants to merge 11 commits intosimplefoc:rp2350_current_sensefrom

thomasfla:rp2350_current_sense

Commits on Aug 27, 2025

Commits on Sep 2, 2025

first working version of a PIO to DMA setup without CPU calls. Transmitting 64bits per samples, in a ring buffer from witch the CPU can take the last samples.
thomasfla
committed

Commits on Sep 3, 2025

add code to read the current from last measurement in buffer.
thomasfla
committed
make interleaving inline, todo optim (2.27us to read and decode the adc values from buffer)
thomasfla
committed

Commits on Sep 4, 2025

Fix bit order, edge sampling and deinterleaving, First working version, validated on RP2350 with 3 ADCs
thomasfla
committed

Commits on Sep 5, 2025

Optimize de-interleaving (getPhaseCurrents() < 1uS on Rp2350), Unroll the loop, only do abc, only 12bits
thomasfla
committed

Commits on Sep 8, 2025

Document the internal design in readme
thomasfla
committed

Commits on Sep 11, 2025