Combine 4 bytes in float

thanks!

i've never userd this function "union"

by the way, the compiler say me:

../acquisition_6.c:78: error: `b' undeclared (first use in this function)

../acquisition_6.c:78: error: (Each undeclared identifier is reported only once

../acquisition_6.c:78: error: for each function it appears in.)

../acquisition_6.c:83: error: incompatible type for argument 1 of `printf'

but the code is:

--- Quote Start ---

void ParseCoeff(){

[...]

union { unsigned char b[4]; float f; } x;

if (UartHasFourByte()){

b[1] = GetUart();

b[2] = GetUart();

b[3] = GetUart();

b[4] = GetUart();

coeff = x.f;

[...]

--- Quote End ---