Joseph Ellsworth / Mbed 2 deprecated frdm_print_unique_serial_number

Pulls unique serial number from CPU and prints to serial console and displays on LCD. Used to generate a guaranteed unique ID for IoT apps where the IoT device needs to become it's own access point. Should work on native hardware unlike the MBED MAC address which would not be available on some custom PCB. Tested on KL46Z but should also work on most STM CPU.

Dependencies:   SLCD mbed

main.cpp@1:61ccbbc268f6, 2016-03-09 (annotated)

Committer:
joeata2wh
Date:
Wed Mar 09 17:50:16 2016 +0000
Revision:
1:61ccbbc268f6
Parent:
0:eddce2241b50 
added  lu specifier to avoid compiler warning in printf

Who changed what in which revision?

UserRevisionLine numberNew contents of line
joeata2wh 0:eddce2241b50 1 /*
joeata2wh 0:eddce2241b50 2 by Joseph Ellsworth CTO A2WH.
joeata2wh 0:eddce2241b50 3 Freeuse for all. No promises, No warranty *
joeata2wh 0:eddce2241b50 4 Please contact us http://a2wh.com for help with custom design projects.
joeata2wh 0:eddce2241b50 5
joeata2wh 0:eddce2241b50 6 Most STM and Freescale ARM chips include a unique Serail Number embedded
joeata2wh 0:eddce2241b50 7 in the CPU. This is a perfect number to use in IoT as a SSID. I use
joeata2wh 0:eddce2241b50 8 this to produce the WIFi SID so I can walk up with a phone and download
joeata2wh 0:eddce2241b50 9 telemetry. I found a blog discussion for mbed that suggested using the
joeata2wh 0:eddce2241b50 10 MAC but this assumes mbed hardware whereas this version uses the serial
joeata2wh 0:eddce2241b50 11 number built in to the CPU so it should work on native boards.
joeata2wh 0:eddce2241b50 12 */
joeata2wh 0:eddce2241b50 13
joeata2wh 0:eddce2241b50 14 #include "mbed.h"
joeata2wh 0:eddce2241b50 15 #include "SLCD.h"
joeata2wh 0:eddce2241b50 16 //#include "lcd_scroll.h"
joeata2wh 0:eddce2241b50 17
joeata2wh 0:eddce2241b50 18
joeata2wh 0:eddce2241b50 19 #define uniqueSerialAdd_kl_freescale (unsigned long *)0x40048058
joeata2wh 0:eddce2241b50 20 #define uniqueSerialAddr_stm32 (unsigned long *)0x1FFFF7E8
joeata2wh 0:eddce2241b50 21 #define uniqueSerialAddr uniqueSerialAdd_kl_freescale
joeata2wh 0:eddce2241b50 22 #define lcdlen 4
joeata2wh 0:eddce2241b50 23 // Change to enable for address for your chip family
joeata2wh 0:eddce2241b50 24 // Note some ealry stm L3 chips were produced with all
joeata2wh 0:eddce2241b50 25 // chip ID set to FFF. I have not seen any but did find
joeata2wh 0:eddce2241b50 26 // it mentioned in a blog.
joeata2wh 0:eddce2241b50 27
joeata2wh 0:eddce2241b50 28
joeata2wh 0:eddce2241b50 29
joeata2wh 0:eddce2241b50 30 DigitalOut gpo(D0);
joeata2wh 0:eddce2241b50 31 DigitalOut led(LED_RED);
joeata2wh 0:eddce2241b50 32 Serial pc(USBTX, USBRX);
joeata2wh 0:eddce2241b50 33 SLCD slcd;
joeata2wh 0:eddce2241b50 34
joeata2wh 0:eddce2241b50 35
joeata2wh 0:eddce2241b50 36 /* format the unique serial number as a string. we could use
joeata2wh 0:eddce2241b50 37 as the router SID for Lot. Supress leading zeros to save
joeata2wh 0:eddce2241b50 38 space */
joeata2wh 0:eddce2241b50 39 void getUniqueIDAsStr(char *destStr)
joeata2wh 0:eddce2241b50 40 {
joeata2wh 0:eddce2241b50 41 unsigned long *Unique = uniqueSerialAddr;
joeata2wh 1:61ccbbc268f6 42 sprintf(destStr, "S%luX%luX%luX\000", Unique[0], Unique[1], Unique[2]);
joeata2wh 0:eddce2241b50 43 }
joeata2wh 0:eddce2241b50 44
joeata2wh 0:eddce2241b50 45
joeata2wh 0:eddce2241b50 46 void scroll(int lcdLen, char *message, float charDelay)
joeata2wh 0:eddce2241b50 47 {
joeata2wh 0:eddce2241b50 48 short msgLen = strlen(message);
joeata2wh 0:eddce2241b50 49 short maxStartndx = msgLen - lcdLen;
joeata2wh 0:eddce2241b50 50 short currndx = 0;
joeata2wh 0:eddce2241b50 51 short currpos = 0;
joeata2wh 0:eddce2241b50 52 short winndx;
joeata2wh 0:eddce2241b50 53 slcd.clear();
joeata2wh 0:eddce2241b50 54
joeata2wh 0:eddce2241b50 55 slcd.Home();
joeata2wh 0:eddce2241b50 56 for (currndx = 0; currndx <= maxStartndx; currndx++) {
joeata2wh 0:eddce2241b50 57 for (winndx = 0; winndx < lcdLen ; winndx++) {
joeata2wh 0:eddce2241b50 58 currpos = currndx + winndx;
joeata2wh 0:eddce2241b50 59 if (message[currpos] == 0) {
joeata2wh 0:eddce2241b50 60 break;
joeata2wh 0:eddce2241b50 61 }
joeata2wh 0:eddce2241b50 62 slcd.putc(message[currpos]);
joeata2wh 0:eddce2241b50 63 }
joeata2wh 0:eddce2241b50 64 wait(charDelay);
joeata2wh 0:eddce2241b50 65 }
joeata2wh 0:eddce2241b50 66 currndx++;
joeata2wh 0:eddce2241b50 67
joeata2wh 0:eddce2241b50 68 }
joeata2wh 0:eddce2241b50 69
joeata2wh 0:eddce2241b50 70
joeata2wh 0:eddce2241b50 71 int main()
joeata2wh 0:eddce2241b50 72 {
joeata2wh 0:eddce2241b50 73 pc.baud(9600);
joeata2wh 0:eddce2241b50 74 unsigned long *Unique = uniqueSerialAddr;
joeata2wh 1:61ccbbc268f6 75 printf("Simple Serial# %08luX %08luX %08luX\n", Unique[0], Unique[1], Unique[2]);
joeata2wh 0:eddce2241b50 76
joeata2wh 0:eddce2241b50 77 char uniqueAsStr[33];
joeata2wh 0:eddce2241b50 78 getUniqueIDAsStr(uniqueAsStr);
joeata2wh 0:eddce2241b50 79 pc.printf("Serial as SID %s\n", uniqueAsStr); // send back to PC
joeata2wh 0:eddce2241b50 80
joeata2wh 0:eddce2241b50 81
joeata2wh 0:eddce2241b50 82 while (true) {
joeata2wh 0:eddce2241b50 83 gpo = !gpo; // toggle pin
joeata2wh 0:eddce2241b50 84 led = !led; // toggle led
joeata2wh 0:eddce2241b50 85
joeata2wh 0:eddce2241b50 86 slcd.clear();
joeata2wh 0:eddce2241b50 87 scroll(lcdlen, uniqueAsStr, 1.2);
joeata2wh 0:eddce2241b50 88 wait(2.0);
joeata2wh 0:eddce2241b50 89 }
joeata2wh 0:eddce2241b50 90 }