Arduino for STM32

for 32k RTC crystal , i've a few times it doesn't oscillate, but normally for the HSE 8, 12, 25 mhz crystals etc, seldom have problem, so it is surprising if HSE don't oscillate, but maybe sometimes that can happen.

if you really want to get to the bottom of that, the only way seemed to be to use a st-link v2 https://www.adafruit.com/product/2548 https://www.st.com/en/development-tools/st-link-v2.html https://octopart.com/search?q=st-link+v2&currency=USD&specs=0 then you can try to debug that, but that ...

The values given and used are correct, yup check the LED, try to use a led connected to a different pin manually e.g. on the headers. I've more than once used boards with a 'defective' LED, sometimes they put the LED reversed, that'd never light up. manufacturing error. no need to look at schematic....

@Fziegler_076 wrote: RCC_OscInitStruct.PLL.PLLM = 8; RCC_OscInitStruct.PLL.PLLN = 48; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4; RCC_OscInitStruct.PLL.PLLQ = 8; ^ this won't work, try RCC_OscInitStruct.PLL.PLLM = 8; RCC_OscInitStruct.PLL.PLLN = 192; RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2; RCC_O...

Note that even with a wrong crystal frequency, you should be able to blink your led void setup() { pinMode(LED_BUILTIN,OUTPUT); } void loop() { digitalWrite(LED_BUILTIN, ! digitalRead(LED_BUILTIN)); delay(1000); } and your LED should blink, if it doesn't blink then your issue is likely not related t...

I suppose you are using a stm32f401cxx blackpill (or some such variant?) https://stm32-base.org/boards/STM32F401CCU6-WeAct-Black-Pill-V1.2.html the 'usual' thing is, keep your usb cable connected press both boot0 and reset hold boot0 and release reset release boot0 1-2 secs later you can check in 'd...

Binary size difference appears to be Newlib Standard vs Newlib nano setting... Not entirely sure what newlib is... :D Clock situation still appears to be happening. I once tried things like -nostdlib -nostartfiles -nodefaultlibs https://gcc.gnu.org/onlinedocs/gcc-4.4.2/gcc/Link-Options.html and the...

many GPS device initialize at 9600 baud, not 57600 baud. and various of them offer commands to set the baud rates after initially connecting at 9600 bps if you do not know the actual GPS bauds, to avoid getting gibberish, you would need to practically test every practical known baud, till one that d...

for uart, your *baud rates* and line discipline (e.g. 8N1) matters. for usb (CDC) serial, it doesn't matter, there is no baud rates, it is straight 12 Mbps USB full speeds based on the specs. so if you are using uart and the other side is not at the same baud rates, all data will be garbled. for uar...

you can try playing with the hardware timer and PWM https://github.com/stm32duino/Arduino_Core_STM32/wiki/HardwareTimer-library https://github.com/stm32duino/STM32Examples/tree/main/examples/Peripherals/HardwareTimer but that if that is some form of sigma delta DAC https://en.wikipedia.org/wiki/Delt...