renesas-ra: Add networking support using lwIP.

Signed-off-by: iabdalkader <i.abdalkader@gmail.com>

ports/renesas-ra/lwip_inc/arch/cc.h

@@ -0,0 +1,10 @@
+#ifndef MICROPY_INCLUDED_RP2_LWIP_ARCH_CC_H
+#define MICROPY_INCLUDED_RP2_LWIP_ARCH_CC_H
+
+#include <assert.h>
+#define LWIP_PLATFORM_DIAG(x)
+#define LWIP_PLATFORM_ASSERT(x)  { assert(1); }
+
+#define LWIP_NO_CTYPE_H 1
+
+#endif // MICROPY_INCLUDED_RP2_LWIP_ARCH_CC_H

ports/renesas-ra/lwip_inc/arch/sys_arch.h

@@ -0,0 +1 @@
+// empty

ports/renesas-ra/lwip_inc/lwipopts.h

@@ -0,0 +1,54 @@
+#ifndef MICROPY_INCLUDED_RA_LWIP_LWIPOPTS_H
+#define MICROPY_INCLUDED_RA_LWIP_LWIPOPTS_H
+
+#include <stdint.h>
+
+// This protection is not needed, instead protect lwIP code with flags
+#define SYS_ARCH_DECL_PROTECT(lev) do { } while (0)
+#define SYS_ARCH_PROTECT(lev) do { } while (0)
+#define SYS_ARCH_UNPROTECT(lev) do { } while (0)
+
+#define NO_SYS                          1
+#define SYS_LIGHTWEIGHT_PROT            1
+#define MEM_ALIGNMENT                   4
+
+#define LWIP_CHKSUM_ALGORITHM           3
+#define LWIP_CHECKSUM_CTRL_PER_NETIF    1
+
+#define LWIP_ARP                        1
+#define LWIP_ETHERNET                   1
+#define LWIP_RAW                        1
+#define LWIP_NETCONN                    0
+#define LWIP_SOCKET                     0
+#define LWIP_STATS                      0
+#define LWIP_NETIF_HOSTNAME             1
+
+#define LWIP_IPV6                       0
+#define LWIP_DHCP                       1
+#define LWIP_DHCP_CHECK_LINK_UP         1
+#define DHCP_DOES_ARP_CHECK             0 // to speed DHCP up
+#define LWIP_DNS                        1
+#define LWIP_DNS_SUPPORT_MDNS_QUERIES   1
+#define LWIP_MDNS_RESPONDER             1
+#define LWIP_IGMP                       1
+
+#define LWIP_NUM_NETIF_CLIENT_DATA      LWIP_MDNS_RESPONDER
+#define MEMP_NUM_UDP_PCB                (4 + LWIP_MDNS_RESPONDER)
+#define MEMP_NUM_SYS_TIMEOUT            (LWIP_NUM_SYS_TIMEOUT_INTERNAL + LWIP_MDNS_RESPONDER)
+
+#define SO_REUSE                        1
+#define TCP_LISTEN_BACKLOG              1
+
+extern uint32_t rng_read(void);
+#define LWIP_RAND() rng_read()
+
+// lwip takes 26700 bytes
+#define MEM_SIZE (8000)
+#define TCP_MSS (800)
+#define TCP_WND (8 * TCP_MSS)
+#define TCP_SND_BUF (8 * TCP_MSS)
+#define MEMP_NUM_TCP_SEG (32)
+
+typedef uint32_t sys_prot_t;
+
+#endif // MICROPY_INCLUDED_RA_LWIP_LWIPOPTS_H