David Godfrey

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12 years ago.

Can a program retrieve MBED serial number?

Need a unique identifier for each device. Hoping to use the mbed serial number, but can't find any reference to retrieving it.

Can anyone help?

3 Answers

Joseph Ellsworth
8 years, 11 months ago.

Try the sample at https://developer.mbed.org/users/joeata2wh/code/frdm_print_unique_serial_number/ It uses the CPU ID which should always be available rather than the MAC address which may not be available on custom PCB.

chris t
12 years ago.

Hi you could try reading the mac address for a unique number to do that try this bit of code

extern "C" mbed_mac_address(char *);
 
int main() {
    char mac[6];
    mbed_mac_address(mac);
}

I think the mac address is derived from the serial number or the otherway round

Hope this helps

Chris

Wim Huiskamp
12 years ago.

The code for the mac address should work. Simon Ford posted a message on reading the UID topic a long time ago:

You can read the full UID of the mbed (from which the MAC is extracted) using a semihost call to the mbed interface. Here is the outline code:

#define USR_UID 0x101

int semihost_uid(char *uid) {
  int32_t args[2];
  args[0] = (uint32_t)uid;
  args[1] = 33;
  return __semihost(USR_UID, &args);
}