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Original question:

Compiler/MSP430FR2433: Issue with sprintf with unsigned int

Compiler/MSP430FR2433: Issue with sprintf with unsigned int and float

maanideep kumar
Intellectual 265 points
Part Number: MSP430FR2433

Tool/software: TI C/C++ Compiler

Hi,

 If I use --printf_support=nofloat i'm not able to use float value. If I use minimal mode I'm not able to use unsigned integer. If I use full mode getting some memory usage error. But my requirement is to display float and unsigned interger using UART on Teraterm.

Thankyou 

  • 0
    Guru 95575 points

    One fairly simple trick I've used is to scale the float into an integer, then split it into Left and Right of the decimal point for formatting. Schematically, something like:

    int intval = floatval * 100;        // Save two decimal places
int intpart = intval / 100;         // Integer part (left of decimal point)
int decpart = intval % 100;         // Decimal digits (right)
sprintf(str,"%d.%02d", intpart, decpart);   // Use snprintf(), not sprintf()

    I can't find any of that code, but I seem to recall a few corner cases (-0, maybe?). That's the essence, anyway.

  • 0 in reply to maanideep kumar
    Guru 95575 points
    I thought you were using "nofloat" rather than "minimal". I'm pretty sure "nofloat" supports field widths.
  • 0 in reply to maanideep kumar
    Guru 26200 points
    Line 4:
    sprintf(str,"%d.%02d", intpart, decpart); // Use snprintf(), not sprintf()
    snsprintf() is not used.

    if (decpart < 10)
    sprintf(str,"%d.0%d", intpart, decpart);
    else
    sprintf(str,"%d.%d", intpart, decpart);

    Probably less code than implementing / using modifiers.

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