stmlib | STM32F project template and utility routines
kandi X-RAY | stmlib Summary
kandi X-RAY | stmlib Summary
Mutable Instruments' project template, makefile, and libraries for STM32F projects. See LICENSE for licensing information.
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QUESTION
We are developing for the STM32F103 MCU. We use bare-metal C++ code with the ARM GCC toolchain. After some hours of struggling with a suspicious expression, we found that the constant keyword triggers different results of that expression. When testing the same piece of code with the x86 GCC toolchain, the problem is nonexistent.
We are using the STM's GPIOS for debugging.
This is the code that that fully reproduces the problem:
ANSWER
Answered 2017-Nov-12 at 16:23Promoting my theory to an answer because it is confirmed by the startup code and LD script.
C++ initialization code, which is supposed to copy 62 into prescaler_1ms
, is not called. When you define RTC_FREQ
as const
, the result of this computation is known at compile time, 62 lives in the flash and needs no initialization.
C++ initialization is performed by a number of generated functions, with names like _Z41__static_initialization_and_destruction_0ii
. Pointers to these functions are collected by the compiler in the .init_array
and .pre_init_array
sections. Before main()
is called, the startup code should iterate over these pointers and call each of them. The boundaries of these pointer arrays are known to the startup code because these special symbols are defined by the linker script:
QUESTION
Here is an example enum I have in EncLib
namespace:
ANSWER
Answered 2017-Apr-16 at 12:09After some tries, I found myself a simple solution:
- Close solution.
- Go to the project directory.
- Open
EncSettings.settings
with a text editor. Change the following line:
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