rp2: Add framework for networking.

MICROPY_PY_NETWORK and MICROPY_PY_USOCKET need to be enabled by a board to
get networking.  No NICs have yet been defined.

extmod/extmod.cmake

@@ -16,6 +16,7 @@ set(MICROPY_SOURCE_EXTMOD
     ${MICROPY_EXTMOD_DIR}/modbluetooth.c
     ${MICROPY_EXTMOD_DIR}/modbtree.c
     ${MICROPY_EXTMOD_DIR}/modframebuf.c
+    ${MICROPY_EXTMOD_DIR}/modnetwork.c
     ${MICROPY_EXTMOD_DIR}/modonewire.c
     ${MICROPY_EXTMOD_DIR}/moduasyncio.c
     ${MICROPY_EXTMOD_DIR}/modubinascii.c
@@ -27,6 +28,7 @@ set(MICROPY_SOURCE_EXTMOD
     ${MICROPY_EXTMOD_DIR}/modurandom.c
     ${MICROPY_EXTMOD_DIR}/modure.c
     ${MICROPY_EXTMOD_DIR}/moduselect.c
+    ${MICROPY_EXTMOD_DIR}/modusocket.c
     ${MICROPY_EXTMOD_DIR}/modussl_axtls.c
     ${MICROPY_EXTMOD_DIR}/modussl_mbedtls.c
     ${MICROPY_EXTMOD_DIR}/modutimeq.c

extmod/modusocket.c

@@ -35,7 +35,7 @@
 #include "shared/netutils/netutils.h"
 #include "modnetwork.h"
 
-#if MICROPY_PY_USOCKET && !MICROPY_PY_LWIP
+#if MICROPY_PY_NETWORK && MICROPY_PY_USOCKET && !MICROPY_PY_LWIP
 
 /******************************************************************************/
 // socket class
@@ -517,4 +517,4 @@ const mp_obj_module_t mp_module_usocket = {
     .globals = (mp_obj_dict_t *)&mp_module_usocket_globals,
 };
 
-#endif // MICROPY_PY_USOCKET && !MICROPY_PY_LWIP
+#endif // MICROPY_PY_NETWORK && MICROPY_PY_USOCKET && !MICROPY_PY_LWIP

ports/rp2/CMakeLists.txt

@@ -66,6 +66,7 @@ set(MICROPY_SOURCE_LIB
     ${MICROPY_DIR}/lib/littlefs/lfs2_util.c
     ${MICROPY_DIR}/lib/oofatfs/ff.c
     ${MICROPY_DIR}/lib/oofatfs/ffunicode.c
+    ${MICROPY_DIR}/shared/netutils/netutils.c
     ${MICROPY_DIR}/shared/readline/readline.c
     ${MICROPY_DIR}/shared/runtime/gchelper_m0.s
     ${MICROPY_DIR}/shared/runtime/gchelper_native.c

ports/rp2/main.c

@@ -33,6 +33,7 @@
 #include "py/mphal.h"
 #include "py/stackctrl.h"
 #include "extmod/modbluetooth.h"
+#include "extmod/modnetwork.h"
 #include "shared/readline/readline.h"
 #include "shared/runtime/gchelper.h"
 #include "shared/runtime/pyexec.h"
@@ -112,6 +113,9 @@ int main(int argc, char **argv) {
         #if MICROPY_PY_BLUETOOTH
         mp_bluetooth_hci_init();
         #endif
+        #if MICROPY_PY_NETWORK
+        mod_network_init();
+        #endif
 
         // Execute _boot.py to set up the filesystem.
         pyexec_frozen_module("_boot.py");
@@ -142,6 +146,9 @@ int main(int argc, char **argv) {
 
     soft_reset_exit:
         mp_printf(MP_PYTHON_PRINTER, "MPY: soft reboot\n");
+        #if MICROPY_PY_NETWORK
+        mod_network_deinit();
+        #endif
         rp2_pio_deinit();
         #if MICROPY_PY_BLUETOOTH
         mp_bluetooth_deinit();

ports/rp2/mpconfigport.h

@@ -166,11 +166,26 @@
     { MP_ROM_QSTR(MP_QSTR_open), MP_ROM_PTR(&mp_builtin_open_obj) },
 
 extern const struct _mp_obj_module_t mp_module_machine;
+extern const struct _mp_obj_module_t mp_module_network;
 extern const struct _mp_obj_module_t mp_module_onewire;
 extern const struct _mp_obj_module_t mp_module_rp2;
 extern const struct _mp_obj_module_t mp_module_uos;
+extern const struct _mp_obj_module_t mp_module_usocket;
 extern const struct _mp_obj_module_t mp_module_utime;
 
+#if MICROPY_PY_USOCKET
+#define SOCKET_BUILTIN_MODULE               { MP_ROM_QSTR(MP_QSTR_usocket), MP_ROM_PTR(&mp_module_usocket) },
+#else
+#define SOCKET_BUILTIN_MODULE
+#endif
+#if MICROPY_PY_NETWORK
+#define NETWORK_BUILTIN_MODULE              { MP_ROM_QSTR(MP_QSTR_network), MP_ROM_PTR(&mp_module_network) },
+#define NETWORK_ROOT_POINTERS               mp_obj_list_t mod_network_nic_list;
+#else
+#define NETWORK_BUILTIN_MODULE
+#define NETWORK_ROOT_POINTERS
+#endif
+
 #if MICROPY_PY_BLUETOOTH
 #define MICROPY_PORT_ROOT_POINTER_BLUETOOTH struct _machine_uart_obj_t *mp_bthci_uart;
 #else
@@ -191,11 +206,15 @@ struct _mp_bluetooth_nimble_malloc_t;
     { MP_OBJ_NEW_QSTR(MP_QSTR__rp2), (mp_obj_t)&mp_module_rp2 }, \
     { MP_ROM_QSTR(MP_QSTR_uos), MP_ROM_PTR(&mp_module_uos) }, \
     { MP_ROM_QSTR(MP_QSTR_utime), MP_ROM_PTR(&mp_module_utime) }, \
+    SOCKET_BUILTIN_MODULE \
+    NETWORK_BUILTIN_MODULE \
 
 #ifndef MICROPY_BOARD_ROOT_POINTERS
 #define MICROPY_BOARD_ROOT_POINTERS
 #endif
 
+#define MICROPY_PORT_NETWORK_INTERFACES \
+
 #define MICROPY_PORT_ROOT_POINTERS \
     const char *readline_hist[8]; \
     void *machine_pin_irq_obj[30]; \
@@ -203,6 +222,7 @@ struct _mp_bluetooth_nimble_malloc_t;
     void *rp2_state_machine_irq_obj[8]; \
     void *rp2_uart_rx_buffer[2]; \
     void *rp2_uart_tx_buffer[2]; \
+    NETWORK_ROOT_POINTERS \
     MICROPY_BOARD_ROOT_POINTERS \
     MICROPY_PORT_ROOT_POINTER_BLUETOOTH \
         MICROPY_PORT_ROOT_POINTER_BLUETOOTH_NIMBLE \