Get 128-bit UUID from SAMD21 micro - C (Arduino compatible)

samd21-uuid.c

uint32_t * get_chip_uuid() 
{
  static uint32_t uuid[3] = { 0 };
  uuid[0] = *(volatile uint32_t *)0x0080A00C;
  uuid[1] = *(volatile uint32_t *)0x0080A040;
  uuid[2] = *(volatile uint32_t *)0x0080A044;
  uuid[3] = *(volatile uint32_t *)0x0080A048;
  
  return uuid;
}



// Usage
uint32_t * uuid_buf = get_chip_uuid();  //pointer to 128-bit UUID

for (uint8_t i = 0; i < 4; i++) {
  uart_print_hex( *(uuid_buf+i) );
}