DeviceUid: changed uid vendor string in STM targets to a much smaller form

Author: MikeDK

targets/TARGET_STM/device_uid_api.c

@@ -104,16 +104,15 @@ void device_uid_get_str(char *str)
     x = (uid_buf[0] >> 16) & 0x0000FFFF;
     y = uid_buf[0] & 0x0000FFFF;
 
-    // make a string in format "Lot xxxxxxx Wafer xxx X=xxxxx Y=xxxxx" - max 38 chars including terminating zero
-    strcpy(str, "Lot ");
-    strcat(str, lot_number);
-    strcat(str, " Wafer ");
+    // make a string in format "LLLLLL:WWW:XXXXX:YYYYY" - max 23 chars including terminating zero
+    strcpy(str, lot_number);
+    strcat(str, ":");
     cpu_uid_itoa(wafer_number, buffer, 10);
     strcat(str, buffer);
-    strcat(str, " X=");
+    strcat(str, ":");
     cpu_uid_itoa(x, buffer, 10);
     strcat(str, buffer);
-    strcat(str, " Y=");
+    strcat(str, ":");
     cpu_uid_itoa(y, buffer, 10);
     strcat(str, buffer);
 }

targets/targets.json

@@ -705,7 +705,7 @@
         "public": false,
         "extra_labels": ["STM"],
         "supported_toolchains": ["ARM", "uARM", "IAR", "GCC_ARM"],
-        "macros": ["TRANSACTION_QUEUE_SIZE_SPI=2", "MBED_DEVICEUID_SIZE=12", "MBED_DEVICEUID_STR_SIZE_MAX=38"],
+        "macros": ["TRANSACTION_QUEUE_SIZE_SPI=2", "MBED_DEVICEUID_SIZE=12", "MBED_DEVICEUID_STR_SIZE_MAX=23"],
         "config": {
             "lse_available": {
                 "help": "Define if a Low Speed External xtal (LSE) is available on the board (0 = No, 1 = Yes). If Yes, the LSE will be used to clock the RTC, LPUART, ... otherwise the Low Speed Internal clock (LSI) will be used",