topic Re: sprintf and float in LPCXpresso IDE

sprintf and float

andreaskneissl — Mon, 12 Dec 2016 14:36:45 GMT

I am working wih LpcXpresso IDE and have problems to use the function sprintf() with float conversion. A lot of hints are available in the internet (e.g. uses -u _printf_float). But I do not know, how to handle this. Can anybody give me a solution?

Re: sprintf and float

converse — Mon, 12 Dec 2016 17:11:55 GMT

Very hard to give a solution if you don't describe the problem. Please describe exactly your problem and show us the code you are using.

Re: sprintf and float

andreaskneissl — Tue, 13 Dec 2016 06:21:10 GMT

Here is the code example:

char temp[20];

float wert=1.234

sprintf(temp,"%1.3f",wert)
The result is an empty string. If I use an integer wert and format it with "%d" I get the right string.

Re: sprintf and float

lpcxpresso_supp — Tue, 13 Dec 2016 12:45:28 GMT

So is your project configured to use Redlib, Newlib or NewlibNano as your selected C library?

What are Redlib and Newlib?

If you are using Redlib, then make sure you haven't got CR_INTEGER_PRINTF symbol defined:

Using printf()

And if you are using NewlibNano, then make sure you have "Enable printf/scanf float" enabled in Project properties:

Newlib-Nano Support

If you need further assistance, then please confirm the version of LPCXpresso IDE that you are using, and export and post an example project that shows up your problem:

https://community.nxp.com/message/630625

Regards,

LPCXpresso Support

Re: sprintf and float

rjleiser — Thu, 28 Mar 2024 12:45:33 GMT

For me I found something in the linker settings. Project Properties.

checkboxes for printf and scanf floats.

- this seemed to work for sprintf too.