I'm a bit new to the Freescale embedded world. I have a 56F8037 Dev board that I have been playing around with for a while now. Well, I am trying to get some serial data out of my board. (I havent been using Freemaster as part of my messings about include a linux host that talks to the board). Anywho, I have serial all up and going, but my problem is during the breaking down of Frac16 values for transmission and reconstruction at the other end.
In essence, I simply want to push out some Frac16 variables over serial so I can view them on my linux host.
On the DSC side of things, I have two defines, they are:
#define BYTE_L(x) ((x) & (unsigned short)0xFF)
#define BYTE_H(x) ((x >> 8) & (unsigned short)0xFF)
I then deconstruct a frac16 and send it over serial using the above defines, IE
On the PC side of things, I load the recieved data into a buffer then attempt to reconstruct it. I think this is where the problems arise!
I have a function on the PC side that I put the values from the buffer through to reconstruct them in to floating point versions of the Frac16. In theory, the floats should then contain some value from -1 to 0.9999999
float build_float(char upper, char lower)
return float_val = ((float)((((char)upper) << 8) | (char)lower) / 32768);
Ie Resultant_Float = build_float(ser_buffer, ser_buffer);
But, I am not getting expected values back.
Could anyone please cast an eye over this and let me know if I am on the right track?
Thanks very much,