Memcpy in Arduino How to use it any simple example

Projects Programming
1

What is memcpy function in Arduino?
how can I write below program in Arduino and prints its output overserial monitor.

#include <stdio.h>
#include <string.h>

int main () {
   const char src[12] = "Kashifjaved";
   char dest[12];
   strcpy(dest,"Heloooo!!");
   printf("Before memcpy dest = %s\n", dest);
   memcpy(dest, src, strlen(src)+1);
   printf("After memcpy dest = %s\n", dest);
   
   return(0);
}
2

memcpy() works the same on an Arduino as any other C/C++ compiler

void setup()
{
  Serial.begin(115200);
  const char src[12] = "Kashifjaved";
  char dest[12];
  strcpy(dest, "Heloooo!!");
  Serial.print("Before memcpy dest = ");
  Serial.println(dest);
  memcpy(dest, src, strlen(src) + 1);
  Serial.print("After memcpy dest = ");
  Serial.println(dest);
}

void loop()
{
}
2 Likes
3

can i use baud rate 9600 ?

4

You can use any baud rate that suits you, just like in any other Arduino sketch, but why go so slow ?

1 Like
5

Make it sizeof(src)

And memcpy in arduino is no different from memcpy in C

6

i used 9600 it gives me below output but works fine for 115200
□□□□□□□□□□□□□□□□□□□□□□□□□
Before memcpy dest = Heloooo!!
After memcpy dest = Kashifjaved

7

What is baud rate of your serial monitor? The monitor window has drop down box to select speed

8

Did you change the baud rate in the sketch to 9600 and set the Serial Monitor to 9600 baud ?

9

my serial monitor is set for 9600 baud rate

when I changed baud rate from 115200 to 9600 it gives me some weird characters
and when baud rate is 115200 it gives output like this

Before memcpy dest = Heloooo!!
After memcpy dest = Kashifjaved
□□□□□□□□□□□□□□□□□□□□□□□□□

for both scenarios baud rate of serial monitor is 9600

10

If this is true then your arduino has some serious issues with clock (unlikely)

11

when i match the baud rate in arduino sketch and serial monitor it works well for 115200 but when I changed both to 9600 it gives some weird character before actual output

12

what board?

13

Arduino UNO
When baud rate is 115200

image
image1321×648 26.2 KB

When baud rate is 9600
image
image1317×546 20.6 KB

14

yes

15

Then there is something wrong with your setup sketch.ino - Wokwi Arduino and ESP32 Simulator

1 Like
16

Not surprisingly, when I set both the code and Serial monitor to 9600 baud it still works fine for me

I realise that this is a silly question, but after changing the baud rate in the sketch you did upload the code again, didn't you ?

By the way, I see that you are using IDE 2.0 so that is what I used to test the baud rates

17

codes is working well when i set both baud rate to 115200
but give unusual output when I set baud rate in sketch and serial monitor to 9600

Anyways thanks for support.
Atleast code is working for me now .

18

You did not answer my question in reply #16

19

yes i upload it every time i change baud rate

20

not sure you're really interested in memcpy

consider


char s [80];

int cnt;

// -----------------------------------------------------------------------------
void
setup (void)
{
    Serial.begin (9600);

    Serial.println ("ready");
}

// -----------------------------------------------------------------------------
void
loop (void)
{
    cnt++;

    sprintf (s, " %6d cnt", cnt);
    Serial.println (s);

    delay (1000);
}