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# How to manipulate floating point number in ARM 7 ?

Posted on 2014-01-29

How do I manipulate floating point numbers in ARM 7 based target ?

Our embedded application is based on ARM 7 Microcontroller. This microcontroller does not have floating point unit.

We are using Keil's compiler, assembler, linker, and Real-Time Operating System.

I'm getting unsigned32 minutes over modbus. I need to convert them to hours and send over USB to PC application.

i.e.

Given: 5351 minutes

My embedded application needs to: 5351 / 60 = 89.18333...

Then, I would send 891 or 892 to PC application. They would divide by 10 to display 891 or 892 hours.

What are my options ?

1) Does Keil provide any floating point library ?

2) Floating point math is usually eliminated in embedded systems. Instead, fixed-point math is used. Does Keil provide fixed point math library?

3) Use shift operations to achieve my goal?

What would be the best way to convert minutes to hours in my embedded application?