Lots of nice improvements here. The RISC-V RV32I option is nice -- so many RV32 MCUs have absurdly tiny amounts of SRAM and very limited peripherals. The Cortex M33s are a biiig upgrade from the M0+s in the RP2040. Real atomic operations. An FPU. I'm exited.
Many people seem excited about the FPU. Could you help me understand what hardware floating point support is needed in a MCU for? I remember DSPs using (awkward word-size) fixed point arithmetic.
I think you highlight the exact issue rather well... fixed-point DSP instructions are awkward to use. The FPU and the double-precision hardware with its baked operations work with IEEE floats out of the box, so the programmer can be "lazy." A thousand new programmers can write something like `* 0.7` in C++ inside a tight loop without it stealing 200 instructions from the timing of the rest of the program.
