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Commitbc7f9af

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Add print(float) to save space (VS double).
1 parent9fb5081 commitbc7f9af

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2 files changed

+67
-0
lines changed

2 files changed

+67
-0
lines changed

‎cores/arduino/Print.cpp

Lines changed: 64 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -129,6 +129,11 @@ size_t Print::print(unsigned long long n, int base)
129129
}
130130
}
131131

132+
size_tPrint::print(float n,int digits)
133+
{
134+
returnprintFloat(n, digits);
135+
}
136+
132137
size_tPrint::print(double n,int digits)
133138
{
134139
returnprintFloat(n, digits);
@@ -221,6 +226,13 @@ size_t Print::println(unsigned long long num, int base)
221226
return n;
222227
}
223228

229+
size_tPrint::println(float num,int digits)
230+
{
231+
size_t n =print(num, digits);
232+
n +=println();
233+
return n;
234+
}
235+
224236
size_tPrint::println(double num,int digits)
225237
{
226238
size_t n =print(num, digits);
@@ -406,6 +418,58 @@ size_t Print::printULLNumber(unsigned long long n64, uint8_t base)
406418
return bytes;
407419
}
408420

421+
size_tPrint::printFloat(float number,uint8_t digits)
422+
{
423+
size_t n =0;
424+
425+
if (isnan(number)) {
426+
returnprint("nan");
427+
}
428+
if (isinf(number)) {
429+
returnprint("inf");
430+
}
431+
if (number >4294967040.0) {
432+
returnprint("ovf");// constant determined empirically
433+
}
434+
if (number < -4294967040.0) {
435+
returnprint("ovf");// constant determined empirically
436+
}
437+
438+
// Handle negative numbers
439+
if (number <0.0) {
440+
n +=print('-');
441+
number = -number;
442+
}
443+
444+
// Round correctly so that print(1.999, 2) prints as "2.00"
445+
float rounding =0.5;
446+
for (uint8_t i =0; i < digits; ++i) {
447+
rounding /=10.0;
448+
}
449+
450+
number += rounding;
451+
452+
// Extract the integer part of the number and print it
453+
unsignedlong int_part = (unsignedlong)number;
454+
float remainder = number - (float)int_part;
455+
n +=print(int_part);
456+
457+
// Print the decimal point, but only if there are digits beyond
458+
if (digits >0) {
459+
n +=print('.');
460+
}
461+
462+
// Extract digits from the remainder one at a time
463+
while (digits-- >0) {
464+
remainder *=10.0;
465+
unsignedint toPrint = (unsignedint)remainder;
466+
n +=print(toPrint);
467+
remainder -= toPrint;
468+
}
469+
470+
return n;
471+
}
472+
409473
size_tPrint::printFloat(double number,uint8_t digits)
410474
{
411475
size_t n =0;

‎cores/arduino/Print.h

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -37,6 +37,7 @@ class Print {
3737
size_tprintNumber(unsignedlong,uint8_t);
3838
size_tprintULLNumber(unsignedlonglong,uint8_t);
3939
size_tprintFloat(double,uint8_t);
40+
size_tprintFloat(float,uint8_t);
4041
protected:
4142
voidsetWriteError(int err =1)
4243
{
@@ -86,6 +87,7 @@ class Print {
8687
size_tprint(unsignedlong,int = DEC);
8788
size_tprint(longlong,int = DEC);
8889
size_tprint(unsignedlonglong,int = DEC);
90+
size_tprint(float,int =2);
8991
size_tprint(double,int =2);
9092
size_tprint(const Printable &);
9193

@@ -100,6 +102,7 @@ class Print {
100102
size_tprintln(unsignedlong,int = DEC);
101103
size_tprintln(longlong,int = DEC);
102104
size_tprintln(unsignedlonglong,int = DEC);
105+
size_tprintln(float,int =2);
103106
size_tprintln(double,int =2);
104107
size_tprintln(const Printable &);
105108
size_tprintln(void);

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