CCS/SW-EK-TM4C123GXL: UARTprintf problem

William Herschel

Part Number: SW-EK-TM4C123GXL
Other Parts Discussed in Thread: TMP006

Tool/software: Code Composer Studio

Hi,

I have a problem with UARTprintf:

UARTprintf("Value is %d\n",2) prints Value is 2

but

UARTprintf("Value is %d\n",2.1) prints Value is 760

In fact for any decimal number it is always wrong. Am I misunderstanding the %d format?

Thanks

over 5 years ago

0 Keith Barkley over 5 years ago

Guru 42085 points

Yes, %d is for integers only. You need to use "%f" for floating point, and you may need to specify full printf in the compile options - though that might be an MSP thing.

0 William Herschel over 5 years ago in reply to Keith Barkley

Intellectual 640 points

Thanks. The %f format gives Value is ERROR. Can I get past this?

0 Keith Barkley over 5 years ago in reply to William Herschel

Guru 42085 points

Did you look into compiler options for printf()?

0 William Herschel over 5 years ago in reply to Keith Barkley

Intellectual 640 points

Yes. I put the option in for printf.

0 desouza over 5 years ago in reply to William Herschel

TI__Guru**** 171044 points

Hi,

UARTprintf() and printf() are two different functions. The UART version does not support floating point.

Check:

https://e2e.ti.com/support/microcontrollers/other/f/908/t/396220?how-to-print-floating-values-on-uart

More specifically, the function TMP006DataPrint() of the file <tmp006_task.c>

Regards,

Rafael

0 William Herschel over 5 years ago in reply to desouza

Intellectual 640 points

Thanks Rafael,

Having spent a long time trying all the options I suspected it might not be a supported function.

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CCS/SW-EK-TM4C123GXL: UARTprintf problem