Arduino for STM32

So results are:Independent of 100k or 400k fpr I2C the execution time stais at 4,4 ms, per transfer of the new data to si5351 I have also checked if the interrupt 1, 2 or 5 ms influences the ececution time. No influence the Interrupt is very simple. Is a rotary encoder void handler_tim2(void){ const...

transmission (I2C, UART or SPI for example) will take exactly the same amount of time" That's clear, I 'm going to measure the I2C-time needed to load the si%351 Will take some time... garden Will also look into AN619 if I can take some info. Need for wobbling only 1 kHz min step size at aroun...

sorry should read "fixkomma " and "builtin"

ad1: what do you mean? ad 2: void setup() { Wire.begin(); Wire.setClock(400000); ad3:used lib is https://github.com/etherkit/Si5351Arduino the formulas are something like freq = pll_freq( a+ b/c) the si5351 is quite complicated, so I'm only using the lib. IF I would insert an assembler section in fi...

I have a project with Arduino UNO where the execution time for this line is 5,78 ms si5351.set_freq_manual((fnow) * 100ULL, pll_freq, SI5351_CLK0); //4,5 ms //bin von BluePill enttäuscht My expectation was, using BluePill, 5,78 / (72/16) MHz = 1,28 ms. Result see above. Only 22% quicker. I'm using o...

fpiSTM asks: First which core you used ?

ST-Link V2

upload ends with error:
2022-02-14T10:35:49 WARN src/stlink-usb.c: Error -3 (Permission denied) opening ST-Link/V2 device 002:005

Error Message only with Linux, With Win 10 no erroer code . but no upload done.

Pls help