initial commit

memory.x

@@ -0,0 +1,20 @@
+MEMORY
+{
+  /* https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsds_s140%2FSDS%2Fs1xx%2Fmem_usage%2Fmem_resource_reqs.html&cp=5_7_4_0_13_0_0 */
+
+  /* Need to leave space for the SoftDevice 
+    These values are confirmed working for S140 7.3.0
+
+    They were extracted from the Arduino IDE plugin linked indirectly at https://wiki.seeedstudio.com/XIAO_BLE/
+  */
+  FLASH (rx)     : ORIGIN = 0x27000, LENGTH = 0xED000 - 0x27000
+
+  /* SRAM required by Softdevice depend on
+   * - Attribute Table Size (Number of Services and Characteristics)
+   * - Vendor UUID count
+   * - Max ATT MTU
+   * - Concurrent connection peripheral + central + secure links
+   * - Event Len, HVN queue, Write CMD queue
+   */ 
+  RAM (rwx) :  ORIGIN = 0x20006000, LENGTH = 0x20040000 - 0x20006000
+}