Questions/Basic/16F628A

[BertMan]

I've never used it so I can say how it works but there is code on ME Lebs website for performing floating point. I stay away from FP just for headache sake.

And yes there are 2 bytes to a word.

Bit is a Bit
Byte is 8 Bits
Word if 2 Bytes or 16 Bits

Yep came across that code. I will be picking it apart this evening to see if it can help me. Unfortunately, I cant stay away from floating point because this is what the v2xe outputs.

Word is 2 bytes? I searched and read forever last night and the only definite conclusion I could reach was that it depends on the archietecture. Since my mcu is 8 bit, does this not mean 8 bit is the highest word the mcu can process?

[BertMan]

Still working on it but here is what I got so far. I havent finished the menu system, nor have I figured a way to convert the floating point numbers coming from the V2Xe.

[Ingvar]

It might help to look at Melabs site .......

http://www.melabs.com/resources/fp.htm

[BertMan]

Excellent! There is a subroutine to convert 32bit floats to a usuable ascii format. Hmm.. I dont think the 628 will hold all that code.

[CocaColaKid]

You could try using the 648, it has 4k.

[BertMan]

I ended up using a math co-mcu to do the conversions. This little 8 pin device can convert strings, floats, and longs using the spi interface and only cost me $14. Here is the link: http://www.sparkfun.com/shop/index.php?shop=1&cat=79. Its the umFPU v2.0. I think the cost justified the headaches of using microcode's floating routines, and you can convert a string to float in about 3 lines of code, so I can still use the 628...YEAH!!! Attached is an alpha version of code that I am waiting to test as soon as the device gets here. You can see floating and long conversions in the routines: FloatToString, ConvertSInt32, and SetConfigMenu.

Conclusion to this thread: If you want an easy to use method for floating point conversion in the IEEE754 format, get a fp co-mcu.