I am trying to develop my first "application" for a STM32 in Ride7 and simulate it in the integrated SIM_ARM. Unfortunately, I am getting erroneous results from some simple calculations.

First, I declare a few variables as volatile so the compilter does not optimize the test code away. (note: main.h include a #include statement.)

#include "main.h"

//Global Varibales
//---------------------------------------------------------------------------------
volatile float f1=25.2f;
volatile float f2=.707f;
volatile float f3=17.3f;
volatile float f4;
volatile float f5;

Then, in the main subroutine I do a few test math operations:

/// Main function. 
int main(void)
{
    // Most of the peripherals are connected to APB2.  Turn on the
    // clocks for the interesting peripherals
    RCC->APB2ENR = 0
        // Turn on USART1
        | RCC_APB2ENR_USART1EN
        // Turn on IO Port A
        | RCC_APB2ENR_IOPAEN
        // Turn on IO Port B
        | RCC_APB2ENR_IOPBEN
        // Turn on the alternate function block
        | RCC_APB2ENR_AFIOEN;

    // Put Port A pins 8 through 15 into alternate function/50 MHz
    // mode.
    GPIOA->CRH = 0xBBBBBBBB;

    // Put PB0 into push pull 50 MHz mode
    GPIOB->CRL = 0x03;

    //add
    f3=(f2+f1);
    
    //mult
    f3=(f2*f1);

    //divide
    f4=17.5/(f1);
    
    //trig
    f3=sin(f2);

    f5=atan(f4);

    //more code deleted that continues initialization and begins infinite loop

}

The project compiles and links successfully.

When I debug in SIM-ARM and step through the code the results are...
addition: 25.2+.707=25.907 (good)
multipication: 25.2*.707=8 (not good)
division: 17.5/25.2=0.6944 (good)
trig: sin(.707)=-13.9987 (not good)

From stepping throught the dissasembly, it looks like the following calls were made for the various opetations...
addition: __addsf3
multipication: __aeabi_fmul
division: __aeabi_fmul
sin: __kernel_sin

I am entirely new to Ride7 and the cortex processors in general (experienced with avr-gcc and AVR processors), so I am sure I just don't have something set up correctly... but I have no Idea what.

Thanks in advance for your help!