About RMyer.1

RMyer.1 · 2021-11-24

Hi All, I'm using a STM32F030x4 that has no EEPROM but I don't want to implement EEPROM emulation on the Main Flash as I only need to 'save' a couple of bytes during power off.Is it possible to use the 'User data option byte' @ 0x1FFF_F804 as a non-v...

RMyer.1 · 2021-09-16

Hi All,I'm working with a STM32F303x8, when using the HSI as the clock I've found the timers drift too much between cold and hot running (which is fair), I'm seeing about a 0.3% drift which is an issue for this application.I now have an 8MHz External...

RMyer.1 · 2021-08-26

Hi All,In a situation where someone might be flashing an LED using a Timer Output (eg Alternate Function Mode connected to a Timer channel output), what if you want to then turn the LED on solid or totally off and then maybe back to the Timer flashin...

RMyer.1 · 2021-08-21

Hi All,I'm playing around with the Timers at the moment on a STM32F303 and currently have TIM2 and TIM6 generating an output pulse on every OC event (different frequency ranges).Those Timer based output toggles are of course somewhat locked to certai...

RMyer.1 · 2021-08-06

Hi All,This is not really a specific STM32 question I suppose, so please excuse what might seem like a simple maths question for some of you. How can I do a 1/x operation to a FLT number without using the VDIV command?VDIV takes 14 clock cycles to ...

RMyer.1 · 2021-11-25

Thank you all for your responses. I have plenty of spare flash space to implement a system to store the byte I need to keep and probably never run out of space before a page would need to be erased to start over again.The byte is probably only ever g...

RMyer.1 · 2021-09-17

As an FYI the tip offered by Tesla DeLorean helped, my scope measured (on the MCO pin) 7.99968 MHz when running off the HSE, and 7.975 MHz when running off the HSI, so that explains the issues I was seeing with the timer drift.But I think my problem ...

RMyer.1 · 2021-09-17

Oh wow, I didn't even notice that ST-LINK STM32 had 8MHz on its MCO pin. I need to bridge the jumper on the board but that is a perfect solution, thanks.

RMyer.1 · 2021-09-16

I didn't mention in my post that I am using a Nucleo-32 board, mounted in a socket on some prototype PCB so the XTAL (and load caps) aren't exactly right at the pins. Having said that it is as close as physically possible, but I agree I think there ...

RMyer.1 · 2021-09-16

I have not tried a lower clock speed, I used an 8MHz crystal so it didn't matter if it was running off the internal or external clock source as all the timer calculations would be the same. It doesn't seem to be in the same location in the code wher...

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No EEPROM, what to do?

Using External Xtal causes a hardware exception

Switching Port Pins between Alt Function and Normal mode

Timer Compare output enable on multiple pins

Faster way to do a 1/x operation ?

Re: No EEPROM, what to do?

Re: Using External Xtal causes a hardware exception

Re: Using External Xtal causes a hardware exception

Re: Using External Xtal causes a hardware exception

Re: Using External Xtal causes a hardware exception