Problem while passing float as argument to function

Hi,

I am using CCS v6.1.0.00104 and TivaWare_C_Series-2.1.1.71 on EK-TM4C1294XL on Windiws 8 64 bit.
I am trying to convert float to string and want to add in to JSON string.
I am passing float as argument to the function, but in the function this float reads as -1.
If I redeclare the value or I define float as global variable and than its working fine.

Following is the code snippet.

uint32_t convertFloat2JSON(float fVal)
{
	int32_t i32Idx = 0;
	if(fVal<1.0 && fVal>-1.0){
		i32Idx = 1;
	}
	uint32_t uVal = (uint32_t) (fVal*powf(10.0, 3));
	UARTprintf("\nuVal:%d!!!!!",uVal);
	int iSize = ftostr(uVal);
	
	int i32Size=0;
	for(i32Size = iSize-1; i32Idx <= iSize; i32Idx++){
		UARTprintf(":%d",i32Idx);
		uint32_t iFPow = (uint32_t) powf(10, i32Size);
		uint32_t iVal = uVal / iFPow;
		UARTprintf(":%d*", iVal, iVal);
		uVal = uVal % iFPow;
		i32Size--;
	}

	return (1);
}

int ftostr(uint32_t fVal)
{
	// Extract integer part
	uint32_t ipart = (uint32_t)fVal;
	if(ipart == 0)	return 1;
	int i = 0;
	while(ipart){
		i++;
		ipart = ipart/10;
	}
	return i;
}

Can you please let me know what is the problem in this?

Thanks,
Bhavesh