Programming with SPRESENSE Arduino IDE (Ver1.8.16).
Regarding the function dtoostrf, which is often used to format float and double values in the Arduino language, the following compilation error occurs:
dtostrf_test:13:24:error:'dtostrf' was not decoded in this scope
dtostrf(val1,3,1,s);
^
exit status1
'dtostrf' was not decoded in this scope
In Arduino language, the sprintf function does not support float/double, so I often use dtoostrf, but is it not supported by the SPRESENSE library?
Use Cases:
chars[7];
chat[7];
char buf[20];
float val1 = -10.254;
float val2 = 97.623;
dtostrf(val1,3,1,s);
dtostrf(val2,3,1,t);
sprintf(buf, "%s, %s", %s, t);
Thank you for your cooperation.
spresense arduino
No.1
Implement without dtostrf as sprintf supports floating-point.
sprintf(buf, "%3.1f, %3.1f", val1, val2);
No. 2
Use the String class to convert to a string.
Strings (val1,1);
String tt(val2,1);
sprintf(buf, "%s, %s", ss.c_str(), tt.c_str());
Third
if dtoostrf is already heavily used and difficult to replace
Extract the dtostrf function in the String class and define it locally to utilize it.
#ifdef ARDUINO_ARCH_SPRESENSE
char*dtostrf (double value, unsigned int width, unsigned int decimalPlaces, char*buf)
{
char fmt [20];
snprintf(fmt,20, "%%%d.%df", width, decimalPlaces);
sprintf(buf, fmt, value);
return buf;
}
#endif
Personally, dtostrf is too special, so
I recommend が, which is a common way to use the C language standard library.
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