stm32: Use global lwip build config and support building without lwip.

ports/stm32/Makefile

@@ -52,6 +52,7 @@ INC += -I$(CMSIS_DIR)/
 INC += -I$(TOP)/$(HAL_DIR)/Inc
 INC += -I$(USBDEV_DIR)/core/inc -I$(USBDEV_DIR)/class/inc
 #INC += -I$(USBHOST_DIR)
+INC += -Ilwip_inc
 
 # Basic Cortex-M flags
 CFLAGS_CORTEX_M = -mthumb
@@ -199,7 +200,6 @@ endif
 endif
 
 EXTMOD_SRC_C = $(addprefix extmod/,\
-	modlwip.c \
 	modonewire.c \
         )
 
@@ -383,47 +383,6 @@ SRC_MOD += $(addprefix $(CC3000_DIR)/src/,\
 	)
 endif
 
-LWIP_DIR = lib/lwip/src
-INC += -I$(TOP)/$(LWIP_DIR)/include -Ilwip_inc
-$(BUILD)/$(LWIP_DIR)/core/ipv4/dhcp.o: CFLAGS += -Wno-address
-SRC_MOD += $(addprefix $(LWIP_DIR)/,\
-	core/def.c \
-	core/dns.c \
-	core/inet_chksum.c \
-	core/init.c \
-	core/ip.c \
-	core/mem.c \
-	core/memp.c \
-	core/netif.c \
-	core/pbuf.c \
-	core/raw.c \
-	core/stats.c \
-	core/sys.c \
-	core/tcp.c \
-	core/tcp_in.c \
-	core/tcp_out.c \
-	core/timeouts.c \
-	core/udp.c \
-	core/ipv4/autoip.c \
-	core/ipv4/dhcp.c \
-	core/ipv4/etharp.c \
-	core/ipv4/icmp.c \
-	core/ipv4/igmp.c \
-	core/ipv4/ip4_addr.c \
-	core/ipv4/ip4.c \
-	core/ipv4/ip4_frag.c \
-	core/ipv6/dhcp6.c \
-	core/ipv6/ethip6.c \
-	core/ipv6/icmp6.c \
-	core/ipv6/inet6.c \
-	core/ipv6/ip6_addr.c \
-	core/ipv6/ip6.c \
-	core/ipv6/ip6_frag.c \
-	core/ipv6/mld6.c \
-	core/ipv6/nd6.c \
-	netif/ethernet.c \
-	)
-
 OBJ =
 OBJ += $(PY_O)
 OBJ += $(addprefix $(BUILD)/, $(SRC_LIB:.c=.o))

ports/stm32/eth.c

@@ -28,16 +28,17 @@
 #include "py/mphal.h"
 #include "py/mperrno.h"
 #include "lib/netutils/netutils.h"
-#include "lwip/etharp.h"
-#include "lwip/dns.h"
-#include "lwip/dhcp.h"
-#include "netif/ethernet.h"
 #include "pin_static_af.h"
 #include "modnetwork.h"
 #include "eth.h"
 
 #if defined(MICROPY_HW_ETH_MDC)
 
+#include "lwip/etharp.h"
+#include "lwip/dns.h"
+#include "lwip/dhcp.h"
+#include "netif/ethernet.h"
+
 // ETH PHY register definitions (for LAN8742)
 
 #undef PHY_BCR

ports/stm32/main.c

@@ -34,10 +34,13 @@
 #include "lib/mp-readline/readline.h"
 #include "lib/utils/pyexec.h"
 #include "lib/oofatfs/ff.h"
-#include "lwip/init.h"
 #include "extmod/vfs.h"
 #include "extmod/vfs_fat.h"
 
+#if MICROPY_PY_LWIP
+#include "lwip/init.h"
+#endif
+
 #include "systick.h"
 #include "pendsv.h"
 #include "pybthread.h"

ports/stm32/network_lan.c

@@ -26,12 +26,13 @@
 
 #include "py/runtime.h"
 #include "py/mphal.h"
-#include "lwip/netif.h"
 #include "modnetwork.h"
 #include "eth.h"
 
 #if defined(MICROPY_HW_ETH_MDC)
 
+#include "lwip/netif.h"
+
 typedef struct _network_lan_obj_t {
     mp_obj_base_t base;
     eth_t *eth;