How to print less than 4 digits after the decimal point when printing a float value using System_printf() ?

Kaka

Hi TI Experts,

I am working on a SYS/BIOS project which needs to print float values to the console.

I figured out that the following statement has to be a part of the application .cfg file to enable the System_printf() to support printing of float values.

System.extendedFormats = '%$L%$S%$F%f';

But the System_printf() only prints 4 digits after the decimal point for the float values. I also used a precision specifier like "%.1f" or ""%0.2f"" in the format string of the System_printf(). That doesn't seem to work either.

Please let me know what more to be done to make the function print less than 4 digits after the decimal point.

Best regards.

Kaka

over 7 years ago

Ashish Kapania over 7 years ago

TI__Mastermind 21645 points

Hi Kaka,

Looking at the documentation for System_printf (http://rtsc.eclipse.org/cdoc-tip/xdc/runtime/System.html#printf), it looks like the precision specifier is not support for "%f" conversion specifier. If code size is not a problem then you can try the following workaround:

float val = 1.234556f;
char buf[10]; /* Big enough buffer to hold digits
                 before and after decimal point
                 including decimal point */
char *bufPtr;

System_snprintf(buf, sizeof(buf), "%f", val);
bufPtr = strchr(buf, '.'); /* Find decimal point index */
bufPtr[3] = '\0'; /* Discard all but first 2 digits after decimal point */
System_printf("Val: %s\n", buf);

Best,

Ashish

Kaka over 7 years ago in reply to Ashish Kapania

Guru 24520 points

Hi Ashish,

Thank you for your advice.
I will try to do this. If I have more questions, please let me confirm them.

Best regards.
Kaka

Ashish Kapania over 7 years ago in reply to Kaka

TI__Mastermind 21645 points

Yes, feel free to post if you have more followup questions.

Best,
Ashish

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How to print less than 4 digits after the decimal point when printing a float value using System_printf() ?