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Bumped by Community user

occurred May 10, 2017 at 14:24

replaced http://arduino.stackexchange.com/ with https://arduino.stackexchange.com/

edited Apr 13, 2017 at 12:50

Based on this approach this approach I wanted to implement a function for formatted printing data to the serial monitor. I tried the code below:

int PIN = 12;
void _printf(char *fmt, ...) {
 va_list va;
 va_start(va, fmt);
 char buf[vsnprintf(NULL, 0, fmt, va) + 1];
 sprintf(buf, fmt, va);
 Serial.println(buf);
 va_end(va);
}
void setup() {
 Serial.begin(9600);
 Serial.println("serial monitor has been set up");
 char buf0[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf0, "pin %i configured to output", PIN);
 Serial.println(buf0);
 _printf("pin %i configured to output", PIN);
 char buf1[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf1, "pin %i configured to output", PIN);
 Serial.println(buf1);
 _printf("pin %i configured to output", PIN);
 pinMode(PIN, OUTPUT);
 char buf2[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf2, "pin %i configured to output", PIN);
 Serial.println(buf2);
 _printf("pin %i configured to output", PIN);
 char buf3[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf3, "pin %i configured to output", PIN);
 Serial.println(buf3);
 _printf("pin %i configured to output", PIN);
}
void loop() { }

But it gives me some weird output:

serial monitor has been set up
pin 12 configured to output
pin 2263 configured to output
pin 12 configured to output
pin 2234 configured to output
pin 12 configured to output
pin 2205 configured to output
pin 12 configured to output
pin 2176 configured to output

What do 2263 and 2269 mean? Why does it happen only inside the function? What is my mistake and how can I fix it?

Based on this approach I wanted to implement a function for formatted printing data to the serial monitor. I tried the code below:

int PIN = 12;
void _printf(char *fmt, ...) {
 va_list va;
 va_start(va, fmt);
 char buf[vsnprintf(NULL, 0, fmt, va) + 1];
 sprintf(buf, fmt, va);
 Serial.println(buf);
 va_end(va);
}
void setup() {
 Serial.begin(9600);
 Serial.println("serial monitor has been set up");
 char buf0[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf0, "pin %i configured to output", PIN);
 Serial.println(buf0);
 _printf("pin %i configured to output", PIN);
 char buf1[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf1, "pin %i configured to output", PIN);
 Serial.println(buf1);
 _printf("pin %i configured to output", PIN);
 pinMode(PIN, OUTPUT);
 char buf2[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf2, "pin %i configured to output", PIN);
 Serial.println(buf2);
 _printf("pin %i configured to output", PIN);
 char buf3[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf3, "pin %i configured to output", PIN);
 Serial.println(buf3);
 _printf("pin %i configured to output", PIN);
}
void loop() { }

But it gives me some weird output:

serial monitor has been set up
pin 12 configured to output
pin 2263 configured to output
pin 12 configured to output
pin 2234 configured to output
pin 12 configured to output
pin 2205 configured to output
pin 12 configured to output
pin 2176 configured to output

What do 2263 and 2269 mean? Why does it happen only inside the function? What is my mistake and how can I fix it?

Based on this approach I wanted to implement a function for formatted printing data to the serial monitor. I tried the code below:

int PIN = 12;
void _printf(char *fmt, ...) {
 va_list va;
 va_start(va, fmt);
 char buf[vsnprintf(NULL, 0, fmt, va) + 1];
 sprintf(buf, fmt, va);
 Serial.println(buf);
 va_end(va);
}
void setup() {
 Serial.begin(9600);
 Serial.println("serial monitor has been set up");
 char buf0[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf0, "pin %i configured to output", PIN);
 Serial.println(buf0);
 _printf("pin %i configured to output", PIN);
 char buf1[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf1, "pin %i configured to output", PIN);
 Serial.println(buf1);
 _printf("pin %i configured to output", PIN);
 pinMode(PIN, OUTPUT);
 char buf2[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf2, "pin %i configured to output", PIN);
 Serial.println(buf2);
 _printf("pin %i configured to output", PIN);
 char buf3[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf3, "pin %i configured to output", PIN);
 Serial.println(buf3);
 _printf("pin %i configured to output", PIN);
}
void loop() { }

But it gives me some weird output:

serial monitor has been set up
pin 12 configured to output
pin 2263 configured to output
pin 12 configured to output
pin 2234 configured to output
pin 12 configured to output
pin 2205 configured to output
pin 12 configured to output
pin 2176 configured to output

What do 2263 and 2269 mean? Why does it happen only inside the function? What is my mistake and how can I fix it?

Bumped by Community user

occurred Apr 10, 2017 at 14:24

Bumped by Community user

occurred Mar 11, 2017 at 13:34

added 770 characters in body

Source Link

edited Feb 9, 2017 at 8:03

pt12lol

edited Feb 9, 2017 at 8:03

pt12lol

Based on this approach I wanted to implement a function for formatted printing data to the serial monitor. I tried the code below:

int PIN = 12;
void _printf(char *fmt, ...) {
 va_list va;
 va_start(va, fmt);
 char buf[vsnprintf(NULL, 0, fmt, va) + 1];
 sprintf(buf, fmt, va);
 Serial.println(buf);
 va_end(va);
}
void setup() {
 Serial.begin(9600);
 Serial.println("serial monitor has been set up");
 char buf[vsnprintfbuf0[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(bufbuf0, "pin %i configured to output", PIN);
 Serial.println(bufbuf0);
 _printf("pin %i configured to output", PIN);
 char buf1[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf1, "pin %i configured to output", PIN);
 Serial.println(buf1);
 _printf("pin %i configured to output", PIN);
 pinMode(PIN, OUTPUT);
 char buf2[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf2, "pin %i configured to output", PIN);
 Serial.println(buf2);
 _printf("pin %i configured to output", PIN);
 char buf3[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf3, "pin %i configured to output", PIN);
 Serial.println(buf3);
 _printf("pin %i configured to output", PIN);
}
void loop() { }

But it gives me some weird output:

serial monitor has been set up
pin 12 configured to output
pin 2263 configured to output
pin 226912 configured to output
pin 2234 configured to output
pin 12 configured to output
pin 2205 configured to output
pin 12 configured to output
pin 2176 configured to output

What do 2263 and 2269 mean? Why does it happen only inside the function? What is my mistake and how can I fix it?

Based on this approach I wanted to implement a function for formatted printing data to the serial monitor. I tried the code below:

int PIN = 12;
void _printf(char *fmt, ...) {
 va_list va;
 va_start(va, fmt);
 char buf[vsnprintf(NULL, 0, fmt, va) + 1];
 sprintf(buf, fmt, va);
 Serial.println(buf);
 va_end(va);
}
void setup() {
 Serial.begin(9600);
 Serial.println("serial monitor has been set up");
 char buf[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf, "pin %i configured to output", PIN);
 Serial.println(buf);
 _printf("pin %i configured to output", PIN);
 pinMode(PIN, OUTPUT);
 _printf("pin %i configured to output", PIN);
}
void loop() { }

But it gives me some weird output:

serial monitor has been set up
pin 12 configured to output
pin 2263 configured to output
pin 2269 configured to output

What do 2263 and 2269 mean? Why does it happen only inside the function? What is my mistake and how can I fix it?

Based on this approach I wanted to implement a function for formatted printing data to the serial monitor. I tried the code below:

int PIN = 12;
void _printf(char *fmt, ...) {
 va_list va;
 va_start(va, fmt);
 char buf[vsnprintf(NULL, 0, fmt, va) + 1];
 sprintf(buf, fmt, va);
 Serial.println(buf);
 va_end(va);
}
void setup() {
 Serial.begin(9600);
 Serial.println("serial monitor has been set up");
 char buf0[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf0, "pin %i configured to output", PIN);
 Serial.println(buf0);
 _printf("pin %i configured to output", PIN);
 char buf1[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf1, "pin %i configured to output", PIN);
 Serial.println(buf1);
 _printf("pin %i configured to output", PIN);
 pinMode(PIN, OUTPUT);
 char buf2[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf2, "pin %i configured to output", PIN);
 Serial.println(buf2);
 _printf("pin %i configured to output", PIN);
 char buf3[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf3, "pin %i configured to output", PIN);
 Serial.println(buf3);
 _printf("pin %i configured to output", PIN);
}
void loop() { }

But it gives me some weird output:

serial monitor has been set up
pin 12 configured to output
pin 2263 configured to output
pin 12 configured to output
pin 2234 configured to output
pin 12 configured to output
pin 2205 configured to output
pin 12 configured to output
pin 2176 configured to output

What do 2263 and 2269 mean? Why does it happen only inside the function? What is my mistake and how can I fix it?

Source Link

asked Feb 9, 2017 at 6:54

pt12lol

asked Feb 9, 2017 at 6:54

pt12lol

Serial printf implementation

Based on this approach I wanted to implement a function for formatted printing data to the serial monitor. I tried the code below:

int PIN = 12;
void _printf(char *fmt, ...) {
 va_list va;
 va_start (va, fmt);
 char buf[vsnprintf(NULL, 0, fmt, va) + 1];
 sprintf(buf, fmt, va);
 Serial.println(buf);
 va_end (va);
}
void setup() {
 Serial.begin(9600);
 Serial.println("serial monitor has been set up");
 char buf[vsnprintf(NULL, 0, "pin %i configured to output", PIN) + 1];
 sprintf(buf, "pin %i configured to output", PIN);
 Serial.println(buf);
 _printf("pin %i configured to output", PIN);
 pinMode(PIN, OUTPUT);
 _printf("pin %i configured to output", PIN);
}
void loop() { }

But it gives me some weird output:

serial monitor has been set up
pin 12 configured to output
pin 2263 configured to output
pin 2269 configured to output

What do 2263 and 2269 mean? Why does it happen only inside the function? What is my mistake and how can I fix it?

serial printf