Arduino for STM32

Is this the library?
https://github.com/sparkfun/SparkFun_IC ... inoLibrary

Which core do you use?

44mA at 72MHz is too much, imho.
25-30mA is something I would buy..
What is the board like? Any LEDs with 220ohm serial resistors?
You may run stm32 with an external 8MHz crystal without PLL engaged, you have to change the settings, however.
With 8MHz crystal you may get 5mA Idd.

Squonk42 wrote: ↑Mon Apr 06, 2020 10:17 am Good!

So, just a simple single-precision floating point ALU with Cordic exposed in peripheral address space.

No SIMD vector or MAC operations and no saturation, so almost useless for all DSP usage.

Better than nothing

I doubt there will be Cordic. They do it standard way, imo.

That is good.
From my search above the FPU could work with 4 primitives add/sub/mult/div, while add/sub/mult is 1 cycle and div is more cycles (like 14 in F4xx).
The interrupt fires when div finished, imho.

You need libraries for their FPU usage, otherwise you would be lost..

PS: a search through the SDK shows FPU, with one global FPU interrupt, FPU clock enable flag and FPU_DIV flag.

In 1.0.2 version of their datasheet they list APM32E103x as the chips with an FPU, in 1.0.5 they list APM32F103x as the chips with an FPU. The above "sc_math_sin asm" does not show the FPU usage at all, you have to dig deeper into asm to find out the actual sine() calculation. The FPU has ...

Here is the (Google) translation for page 14: 3.10. Floating Point Unit (FPU) The product has a built-in independent FPU floating-point arithmetic processing unit, it supports the IEEE754 standard single-precision floating-point arithmetic. As it is memory-mapped on the AHB bus (0x40024000-0x400243...

Great, even I recommended to you to better remove both delays() in the loop()

My code sets the output of the 1PPS to 20kHz, that is all. It does not read anything off the NEO. There are examples in the TinyGPS++ library - it should work when all wired properly. Also doublecheck the diodes - that is the best indicator. Confirm they work. For example write a simple loop sending...