Firmware: Add cppmem module.

This module redirects `malloc` and `free` calls to MicroPython's heap, allowing C++ code and MicroPython's "greedy heap" to coexist.

See: micropython/micropython#11116

Author: Gadgetoid

firmware/PIMORONI_BADGER2040/micropython.cmake

@@ -39,6 +39,10 @@ target_compile_definitions(usermod_wakeup INTERFACE
     -DWAKEUP_PIN_VALUE=0b10000000000000010000000000
 )
 
+# Note: cppmem is *required* for C++ code to function on MicroPython
+# it redirects `malloc` and `free` calls to MicroPython's heap
+include(cppmem/micropython)
+
 # LEDs & Matrices
 include(plasma/micropython)
 

firmware/PIMORONI_BADGER2040W/micropython.cmake

@@ -40,6 +40,10 @@ target_compile_definitions(usermod_wakeup INTERFACE
     -DWAKEUP_PIN_VALUE=0b10000000000010000000000
 )
 
+# Note: cppmem is *required* for C++ code to function on MicroPython
+# it redirects `malloc` and `free` calls to MicroPython's heap
+include(cppmem/micropython)
+
 # LEDs & Matrices
 include(plasma/micropython)
 
@@ -49,5 +53,5 @@ include(servo/micropython)
 include(encoder/micropython)
 include(motor/micropython)
 
-# version.py and pimoroni.py
+# version.py, pimoroni.py and boot.py
 include(modules_py/modules_py)