refactor(can-gen): ♻️ Improve CAN generation and build support. (#109)

* refactor(can-gen): ♻️ Improve CAN generation and build support.

Convert ETL from an include path to a proper target in CMake. Refactor cangen Python code to use a functional paradigm and be more "Pythonic"

* undoes unnecessary indent change

* adds requiremens.txt for cangen

firmware/CMakeLists.txt

@@ -111,12 +111,6 @@ add_subdirectory(${DIR_MCAL}) # provides "mcal-<name>" (library)
 add_subdirectory(${DIR_PROJECT}) # modifies "main" (executable)
 add_subdirectory(${DIR_PLATFORM}) # modifies "bindings" (library)
 
-set(DIR_ETL "${CMAKE_CURRENT_SOURCE_DIR}/third-party/etl/include")
-target_include_directories(main
-    PUBLIC
-    ${DIR_ETL}
-)
-
 target_link_libraries(main PRIVATE shared)
 target_link_libraries(main PRIVATE bindings)
 

firmware/mcal/raspi/periph/can.h

@@ -30,7 +30,8 @@ class CanBase : public shared::periph::CanBase {
 
     void Setup() {
         // Create a socket
-        sock_ = socket(PF_CAN, SOCK_RAW, CAN_RAW) if (sock_ < 0) {
+        sock_ = socket(PF_CAN, SOCK_RAW, CAN_RAW);
+        if (sock_ < 0) {
             perror("Error creating socket");
             return;
         }

firmware/mcal/windows/periph/can.h

@@ -15,7 +15,7 @@
 #include "shared/comms/can/raw_can_msg.h"
 #include "shared/periph/can.h"
 
-namespace mcal::periph {
+namespace mcal::windows::periph {
 
 class CanBase : public shared::periph::CanBase {
 public:
@@ -48,4 +48,4 @@ class CanBase : public shared::periph::CanBase {
     std::string iface_;
 };
 
-}  // namespace mcal::periph
+}  // namespace mcal::windows::periph

firmware/projects/DemoCan/CMakeLists.txt

@@ -29,10 +29,15 @@ target_sources(main
 )
 add_dependencies(main generated_can)
 
+
 target_include_directories(main
 	PRIVATE
 	${CMAKE_CURRENT_SOURCE_DIR}/inc
 )
 
+# Link ETL which is needed for generated/can/msg_registry.h
+add_subdirectory(${CMAKE_SOURCE_DIR}/third-party/etl ${CMAKE_BINARY_DIR}/third-party)
+target_link_libraries(main PRIVATE etl)
+
 # Notice that we don't include any mcal/ subdirectory in this CMake file.
 # The master CMakeLists handles platform selection and library linking.

firmware/projects/DemoCan/platforms/windows/bindings.cc

@@ -5,7 +5,7 @@
 #include "shared/periph/can.h"
 
 namespace mcal {
-using namespace periph::windows;
+using namespace windows::periph;
 
 CanBase veh_can_base{"vcan0"};
 }  // namespace mcal