microcontroller

There are many different RTOS available for microcontrollers. I am specifically looking for RTOS that support the ARM Cortex M processors. Also, I am not interested in closed source solutions. Attempting to compare the relative merits of each RTOS from websites and mailing lists seems pretty difficult as they mostly seem to have equivalent features and do the same thing. The real differences become apparently only after trying to use each RTOS for some tasks. I know this is somewhat subjective question and probably hard to answer - but there must be many people out there who have actually

Development for STM32L053R8 on NUCLEO-L053R8 board. We have a system which "wakes" from sleep every 200 μS or so, does a small amount of work then goes back to sleep (Stop mode). Ideally I'd like to wake from STOP in under 50 μS. The HAL_RCC_OscConfig() function takes around 170 μS which renders this effort pointless. From what I can see the majority of time is spent with the PLL Configuration, in particular the while loop ("Wait till PLL is ready") which follows the re-enablement of the PLL (about 98 μS). /* Configure the main PLL clock source, multiplication and division factors. */ __HAL

I would like to use the Decimal() data type in python and convert it to an integer and exponent so I can send that data to a microcontroller/plc with full precision and decimal control. https://docs.python.org/2/library/decimal.html I have got it to work, but it is hackish; does anyone know a better way? If not what path would I take to write a lower level "as_int()" function myself? Example code: from decimal import * d=Decimal('3.14159') t=d.as_tuple() if t[0] == 0: sign=1 else: sign=-1 digits= t[1] theExponent=t[2] theInteger=sign * int(''.join(map(str,digits))) theExponent theInteger For

Closed. This question is off-topic. It is not currently accepting answers. Learn more . Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 months ago . Does anyone know some tools to create a call tree for C application that will run on a microcontroller (Cortex-M3)? It could be generated from source code (not ideal), object code (prefered solution), or at runtime (acceptable). I've looked at gprof, but there's still a lot missing to get it to work on an embedded system. An added bonus would be that the tool also gives the maximum stack depth.

When I declare a function that accepts const char* and I pass a string literal, I get a Warning: [2066] type qualifier mismatch in assignment because string literals are rom const char* . It's the same the other way around. Though the PIC is Harvard architecture, the memory is mapped into one contiguous address space, so theoretically it should be possible to support both ram and rom pointers the same way. Probably I have to use rom pointers because they are 24 bit while ram pointers are 16 bit. However, just casting a const char* to a const rom char* does not work. mizo Unfortunately, this is