Serial.printf of uint64_t

[trlafleur]

Repost of 244...

As you can see, %llu is NOT supported...

If I try to use Serial.printf to print two uint64_t variables, the 2nd one prints as a zero...

Arduino 1.8.13 Feather M0 Adafruit SAMD21 Boards 1.6.0

moved from (arduino/ArduinoCore-sam#109)

Output with %lu
hello...
A: 12345678, B; 0
A: 12345678
B: 87654321

Output with %llu
hello...
A: lu, B; lu
A: lu
B: lu

void setup() {
     Serial.begin (115200);              // Initialize USB/serial connection
     delay(2000);

     Serial.printf("hello...\n");

uint64_t A = 12345678l;
uint64_t B = 87654321l;

Serial.printf ("A: %lu, B; %lu\n", A, B);

Serial.printf ("A: %lu\n", A);
Serial.printf ("B: %lu\n", B);

}

void loop() {
  // put your main code here, to run repeatedly:

}

void setup() {
     Serial.begin (115200);              // Initialize USB/serial connection
     delay(2000);

     Serial.printf("hello...\n");

uint64_t A = 12345678ll;
uint64_t B = 87654321ll;

Serial.printf ("A: %llu, B; %llu\n", A, B);

Serial.printf ("A: %llu\n", A);
Serial.printf ("B: %llu\n", B);

}

void loop() {
  // put your main code here, to run repeatedly:

}

[hathach]

again please post this on the support forum.

[trlafleur]

It’s bug... should be listed on github issues...

~~ /) ~~~~ /) ~~ _/) ~~ _/) ~~

Tom Lafleur

On Aug 6, 2020, at 9:08 AM, Ha Thach notifications@github.com wrote:

 again please post this on the support forum.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub, or unsubscribe.

[hathach]

I did a quick check, the implementation use std newlib vsnprintf(), if it doesn't not work, it is not supported. You could try to change newlib nano link option etc.. to get it work. Though we don't do it ourself, that's why I asked you to open topic on forum support, there are more people there.

[trlafleur]

I understand that %llu may not be supported, put trying to print two numbers on the same printf statement should work and is a bug...

I would suggest that you leave this open and I will also post on forum...

~~ /) ~~~~ /) ~~ _/) ~~ _/) ~~

Tom Lafleur

On Thu, Aug 6, 2020 at 10:35 AM Ha Thach notifications@github.com wrote:

I did a quick check, the implementation use std newlib vsnprintf(), if it doesn't not work, it is not supported. You could try to change newlib nano link option etc.. to get it work. Though we don't do it ourself, that's why I asked you to open topic on forum support, there are more people there.

— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub https://github.com/adafruit/ArduinoCore-samd/issues/245#issuecomment-670074294, or unsubscribe https://github.com/notifications/unsubscribe-auth/ABC4EKYTRMERUXV3GPBZGL3R7LSXRANCNFSM4PWUSMZA .

[hathach]

prtinf with uint64_t is not supported, the behavior is undefined, it is not a bug.