MSP432E401Y: Printing Float data in UART display

Part Number: MSP432E401Y

Tool/software:

Hello Team,

We're trying to print float data via UART in terminal, since the existing UART drivers are not having any provision to print float.

Is there any available example or drivers for printing float with UART?

Thanks in advance

1 month ago

0 Bruce McKenney 1 month ago

Guru 94630 points

What results are you getting now?

You might check to make sure that "Build Settings->Build->Compiler->Advanced->Language Options->Level of printf" is set to "full".

0 Keith Barkley 1 month ago

Guru 41795 points

Once you do what Bruce says, sprintf() should work.

Of course, there is always K&R's itoa() example.

0 Charles Tsai 1 month ago

TI__Guru**** 181966 points

Hi,

Thanks to Bruce and Keith on their suggestions.

MSP432E SDK has UARTPrintf to print data out of the UART port but it does NOT support float. You can use C printf but that does not go out of UART but only to the CIO and will take up a lot of heap space.

You can use usprintf which is a lighter version of sprintf to first convert the float to string and then send out the string out of UARTPrintf.

0 Mp 1 month ago in reply to Charles Tsai

Intellectual 300 points

Hello Charles,

As you've mentioned, i tried both sprintf and usprintf but it code is getting stuck in a default handler from the line 136 or 137 itself.

As per Bruce's suggestion, i checked Level of printf as well and it is set to "full" only.

0 Keith Barkley 1 month ago in reply to Mp

Guru 41795 points

You might need to increase the stack, sprintf() is a hog.

0 Mp 1 month ago in reply to Keith Barkley

Intellectual 300 points

Hello Keith,

Yes I tried increasing the stack size from 512 to 4096 and more as well in the .cmd file, still sprintf is getting stuck in default handler.

For using usprintf, i included the ustdlib.c, ustdlib.h in the project from https://github.com/yuvadm/tiva-c/tree/master/utils

I could see error for it

0 Charles Tsai 1 month ago in reply to Mp

TI__Guru**** 181966 points

Take a look at this post. https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1186770/tm4c123gh6pm-sprintf-with-float---printf_support-full-and-stack-size-to-1024-crashes?tisearch=e2e-sitesearch&keymatch=UARTPrintf%25252520float#

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MSP432E401Y: Printing Float data in UART display