Use simple check in correct place of firmware file thanks to @fanoush - 6cf5a74#commitcomment-165215201

Author: gfwilliams

ChangeLog

@@ -14,7 +14,7 @@
             nRF52: Fix gatt.setRSSIHandler on the first active connection
             Added i2cRead/WriteReg for simplified internal I2C code
             Bangle.js2: Support for new Bangles with MMC36X0 magnetometer (Bangle.dbg() now shows info)
-            nRF52840: Add process.env.SOFTDEVICE for detecting which softdevice version is installed
+            nRF5x: Add process.env.SOFTDEVICE for detecting which softdevice version is installed
 
      2v27 : nRF5x: Ensure Bluetooth notifications work correctly when two separate connections use the same handle for their characteristics
             nRF5x: Remove handlers from our handlers array when a device is disconnected

src/jswrap_process.c

@@ -122,11 +122,17 @@ Returns an Object containing various pre-defined variables.
 * `APP_RAM_BASE` - On nRF5x boards, this is the RAM required by the Softdevice
   *if it doesn't exactly match what was allocated*. You can use this to update
   `LD_APP_RAM_BASE` in the `BOARD.py` file
-* `SOFTDEVICE` - (on nRF52840) the version of Bluetooth Softdevice that is installed on
-  the device, usually `"6.0.0"` or `"6.1.1"`
+* `SOFTDEVICE` - (on nRF5x) the hex version code of the Bluetooth Softdevice that is installed on the device (see below)
 
-For example, to get a list of built-in modules, you can use
-`process.env.MODULES.split(',')`
+To get a list of built-in modules, you can use `process.env.MODULES.split(',')`
+
+The `process.env.SOFTDEVICE` code is likely one of:
+
+| Code         | Chip     | Softdevice            |
+|--------------|----------|-----------------------|
+| 0x0091 / 145 | nRF52832 | S132 v3.1.0 (SDK12)   |
+| 0x00A9 / 169 | nRF52840 | S140 v6.0.0 (SDK15.3) |
+| 0x00B6 / 182 | nRF52840 | S140 v6.1.1 (SDK15)   |
 
 **Note:** `process.env` is not writeable - so as not to waste RAM, the contents
 are generated on demand. If you need to be able to change them, use `process.env=process.env;`
@@ -162,17 +168,8 @@ JsVar *jswrap_process_env() {
   if (app_ram_base)
     jsvObjectSetChildAndUnLock(obj, "APP_RAM_BASE", jsvNewFromInteger((JsVarInt)app_ram_base));
 #endif
-#ifdef NRF52840
-  // Do a CRC of the 32 bytes from offset 256 (in the softdevice area), eg E.CRC32(E.memoryArea(256,32))
-  const char *softdevice = "unknown";
-  JsVar *sdArea = jswrap_espruino_memoryArea(256,32);
-  uint32_t crc = (uint32_t)jsvGetIntegerAndUnLock(jswrap_espruino_CRC32(sdArea));
-  jsvUnLock(sdArea);
-  // compare with known values
-  if (crc == 3039104175) softdevice = "6.0.0";
-  if (crc == 2754746215) softdevice = "6.1.1";
-  jsvObjectSetChildAndUnLock(obj, "SOFTDEVICE", jsvNewFromString(softdevice));
-#endif
+  // https://devzone.nordicsemi.com/f/nordic-q-a/1171/how-do-i-access-softdevice-version-string
+  jsvObjectSetChildAndUnLock(obj, "SOFTDEVICE", jsvNewFromInteger(*(uint16_t*)0x0000300C));
 #endif
   return obj;
 }