Arduino for STM32

http://docs.leaflabs.com/static.leaflab ... /iwdg.html
http://docs.leaflabs.com/static.leaflab ... /iwdg.html

This is one of the best RTOSes you may get for F407:

http://chibios.org/dokuwiki/doku.php

Best way to start is with ChibiStudio:

http://chibios.org/dokuwiki/doku.php?id ... udio:start

The author of Chibios works for STM, afaik.

That description of your problem is not enough to help you.
Porting existing libraries into an Rtos is not easy - you have to create tasks which interacts, etc.
Best you will publish your entire code and it could be somebody helps you then..

Those pins have some limitation - speed and fanout (they are weaker). It was discussed how to enable them on the old forum many times. https://stm32duinoforum.com/forum/index_php.html I think the pins with 32kHz resonator should work when oscillator disabled. Mind there are capacitors to the ground,...

There is a lot of settings in the STlink Utility app - Option Bytes atc.
Doublecheck whether there is not something set such it is disturbing..

Below is a simulation of the input circuitry and Sample and Hold of STM32F103 ADC. Radc is 1k and Cadc is 8pF (Datasheet). C1 is a parasitic capacity of the input pin and wiring. Diodes and 200ohm resistor -> simplified PIN protection wiring inside the chip. 1. First picture is how the edges look li...

Even with 0ohm source the is an internal Radc and sampling capacitor Cadc.
Radc is usualy 1k-10k and Cadc 5-15pF (doublecheck the DS).
That limits the sampling rate, as you have to fully charge the Cadc via Rsource+Radc between the samples within the ADC input voltage limits.

Bingo600 wrote: ↑

Sun Jan 26, 2020 7:28 pm

fpiSTM wrote: ↑

Sun Jan 26, 2020 7:14 pm

This is provided by ARM:
https://github.com/ARM-software/CMSIS_5 ... SP/Lib/GCC

Damm ...
".a" files ==> Compiled libraries

No source ..

Well i'd prob not understand the "magic" anyway

/Bingo

https://github.com/ARM-software/CMSIS_5 ... DSP/Source

Look at my above link - I did CMSIS FFT on 407, you may download sources of libraries for DSP and other math with FPU. https://www.st.com/content/st_com/en/products/embedded-software/mcu-mpu-embedded-software/stm32-embedded-software/stm32-standard-peripheral-libraries/stsw-stm32065.html#get-software...

Another argument for -Os is when you start experiments with those hw switches. With higher optimisation you may lose track.