TMS320C6748: data display

user5075695

Part Number: TMS320C6748

hello,

DSP6748 uses float type variables to receive data 4 and 7 from the FPGA. When displayed in hexadecimal, it is 0x00000004 and 0x00000007.

But when displayed in decimal, it becomes 5.605194e-45 and 9.809089e-45. Why is this? Is there an error in my receiving data?

over 7 years ago

0 Victor Kazmirenko over 7 years ago

Guru 13202 points

Hello!
0x00000004 does not look like floating 4.0. You may refer some tool like www.h-schmidt.net/.../IEEE754.html to see hex representation of floats.
In my experience using float in FPGA is somewhat expensive, so usually data come out of FPGA as integers or, better, Q-format, i.e. fixed point fractional, and need to be explicitly converted to floating point on DSP.
Hope this helps.

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TMS320C6748: data display