CODEWITHSUNDEEP
cavr
ketan
ketan

Reputation: 11

sprintf float and double variable

sprintf(SBuff,"Float value %0.4f ",temp_float);
USART0_TransmitString(SBuff);

I had also tried %f, and making the temp_float variable double (%lf).

But on Usart I always get Float value ? in place of the temp_float value I get question mark.

Upvotes: 0

Views: 1989

Answers (1)

Joachim Isaksson
Joachim Isaksson

Reputation: 180947

AVR's sprintf() doesn't by default implement floating point to save flash space, you need to change some compiler options to make that happen;

If the full functionality including the floating point conversions is required, the following options should be used:

-Wl,-u,vfprintf -lprintf_flt -lm

Full details can be found here.

Upvotes: 4

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