[ell-i-developers] Re: PWM working for TIM2
- From: Pekka Nikander <pekka.nikander@xxxxxx>
- To: ell-i-developers@xxxxxxxxxxxxx
- Date: Fri, 31 Jan 2014 11:45:02 +0200
> What would be your initial guess about it, why it is not considering
> __GPIO ## port ## _PIN0_MODE
> to be a constant, even when they are declared as static const.
Looking at your code, the expression is essentially defined as
static const uint32_t __GPIO ## port ## _PIN ## pin ## _MODE =
GPIO_MODER_MODER0_ ## mode << (pin * 2);
Now, while that is a compile-time constant, IIRC it is not a constant
expression by C89/C99 or even C11 rules:
http://bytes.com/topic/c/answers/663536-c99-does-const-int-x-5-make-x-constant-expression
http://stackoverflow.com/questions/12343027/const-keyword-and-constant-expressions-in-c99-and-c11
Most probably the easiest way is to rename ellduino_gpio.c to ellduino_gpio.cpp
and try again. IIRC C++11 should compile it just fine, but I may be wrong.
--Pekka
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