build_memory_info: Report used, free, and total memory

.. intead of just free and total as before.

Author: jepler

tools/build_memory_info.py

@@ -66,10 +66,12 @@
 firmware_region = regions["FLASH_FIRMWARE"]
 ram_region = regions["RAM"]
 
-free_flash = firmware_region - text - data
-free_ram = ram_region - data - bss
-print("{} bytes free in flash firmware space out of {} bytes ({}kB).".format(free_flash, firmware_region, firmware_region / 1024))
-print("{} bytes free in ram for stack and heap out of {} bytes ({}kB).".format(free_ram, ram_region, ram_region / 1024))
+used_flash = data + text
+free_flash = firmware_region - used_flash
+used_ram = data + bss
+free_ram = ram_region - used_ram
+print("{} bytes used, {} bytes free in flash firmware space out of {} bytes ({}kB).".format(used_flash, free_flash, firmware_region, firmware_region / 1024))
+print("{} bytes used, {} bytes free in ram for stack and heap out of {} bytes ({}kB).".format(used_ram, free_ram, ram_region, ram_region / 1024))
 print()
 
 # Check that we have free flash space. GCC doesn't fail when the text + data