rp2: Add support for using Wiznet hardware as an Ethernet NIC.

Uses the extmod/network_wiznet5k driver to provide network connectivity.

Signed-off-by: Andrew Leech <andrew@alelec.net>

ports/rp2/CMakeLists.txt

@@ -244,6 +244,53 @@ if (MICROPY_PY_NETWORK_NINAW10)
     )
 endif()
 
+if (MICROPY_PY_WIZNET5K)
+    target_compile_definitions(${MICROPY_TARGET} PRIVATE
+        MICROPY_PY_WIZNET5K=1
+        WIZCHIP_PREFIXED_EXPORTS=1
+        _WIZCHIP_=${MICROPY_PY_WIZNET5K}
+        WIZCHIP_YIELD=mpy_wiznet_yield
+    )
+
+    if (MICROPY_PY_LWIP)
+        target_compile_definitions(${MICROPY_TARGET} PRIVATE
+            # When using MACRAW mode (with lwIP), maximum buffer space must be used for the raw socket
+            WIZCHIP_USE_MAX_BUFFER=1
+        )
+    endif()
+
+    target_include_directories(${MICROPY_TARGET} PRIVATE
+        ${MICROPY_DIR}/lib/wiznet5k/
+        ${MICROPY_DIR}/lib/wiznet5k/Ethernet/
+    )
+
+    list(APPEND MICROPY_SOURCE_LIB
+        ${MICROPY_DIR}/lib/wiznet5k/Ethernet/W5100/w5100.c
+        ${MICROPY_DIR}/lib/wiznet5k/Ethernet/W5100S/w5100s.c
+        ${MICROPY_DIR}/lib/wiznet5k/Ethernet/W5200/w5200.c
+        ${MICROPY_DIR}/lib/wiznet5k/Ethernet/W5300/w5300.c
+        ${MICROPY_DIR}/lib/wiznet5k/Ethernet/W5500/w5500.c
+        ${MICROPY_DIR}/lib/wiznet5k/Ethernet/socket.c
+        ${MICROPY_DIR}/lib/wiznet5k/Ethernet/wizchip_conf.c
+        ${MICROPY_DIR}/lib/wiznet5k/Internet/DNS/dns.c
+        ${MICROPY_DIR}/lib/wiznet5k/Internet/DHCP/dhcp.c
+    )
+
+    list(APPEND MICROPY_SOURCE_EXTMOD
+        ${MICROPY_DIR}/extmod/modnetwork.c
+        ${MICROPY_DIR}/extmod/modusocket.c
+        ${MICROPY_DIR}/extmod/network_wiznet5k.c
+    )
+
+    list(APPEND MICROPY_SOURCE_QSTR
+        ${MICROPY_DIR}/extmod/modnetwork.c
+        ${MICROPY_DIR}/extmod/modusocket.c
+        ${MICROPY_DIR}/extmod/network_wiznet5k.c
+    )
+
+    string(CONCAT GIT_SUBMODULES "${GIT_SUBMODULES} " lib/wiznet5k)
+endif()
+
 # Define mpy-cross flags
 set(MICROPY_CROSS_FLAGS -march=armv7m)
 

ports/rp2/machine_spi.c

@@ -269,6 +269,15 @@ STATIC void machine_spi_transfer(mp_obj_base_t *self_in, size_t len, const uint8
     }
 }
 
+machine_spi_obj_t *spi_from_mp_obj(mp_obj_t o) {
+    if (mp_obj_is_type(o, &machine_spi_type)) {
+        machine_spi_obj_t *self = MP_OBJ_TO_PTR(o);
+        return self;
+    } else {
+        mp_raise_TypeError(MP_ERROR_TEXT("expecting an SPI object"));
+    }
+}
+
 STATIC const mp_machine_spi_p_t machine_spi_p = {
     .init = machine_spi_init,
     .transfer = machine_spi_transfer,

ports/rp2/modmachine.h

@@ -17,4 +17,6 @@ void machine_pin_init(void);
 void machine_pin_deinit(void);
 void machine_i2s_init0(void);
 
+struct _machine_spi_obj_t *spi_from_mp_obj(mp_obj_t o);
+
 #endif // MICROPY_INCLUDED_RP2_MODMACHINE_H

ports/rp2/mpconfigport.h

@@ -77,6 +77,7 @@
 #define MICROPY_PY_SYS_PLATFORM                 "rp2"
 #define MICROPY_PY_THREAD                       (1)
 #define MICROPY_PY_THREAD_GIL                   (0)
+#define MICROPY_THREAD_YIELD()                  mp_handle_pending(true)
 
 // Extended modules
 #define MICROPY_EPOCH_IS_1970                   (1)
@@ -163,12 +164,24 @@ extern const struct _mod_network_nic_type_t mod_network_nic_type_nina;
 #define MICROPY_PORT_ROOT_POINTER_NINAW10
 #endif
 
+#if MICROPY_PY_WIZNET5K
+#if MICROPY_PY_LWIP
+extern const struct _mp_obj_type_t mod_network_nic_type_wiznet5k;
+#else
+extern const struct _mod_network_nic_type_t mod_network_nic_type_wiznet5k;
+#endif
+#define MICROPY_HW_NIC_WIZNET5K             { MP_ROM_QSTR(MP_QSTR_WIZNET5K), MP_ROM_PTR(&mod_network_nic_type_wiznet5k) },
+#else
+#define MICROPY_HW_NIC_WIZNET5K
+#endif
+
 #ifndef MICROPY_BOARD_NETWORK_INTERFACES
 #define MICROPY_BOARD_NETWORK_INTERFACES
 #endif
 
 #define MICROPY_PORT_NETWORK_INTERFACES \
     MICROPY_HW_NIC_NINAW10  \
+    MICROPY_HW_NIC_WIZNET5K \
     MICROPY_BOARD_NETWORK_INTERFACES \
 
 #ifndef MICROPY_BOARD_ROOT_POINTERS

ports/rp2/mphalport.c

@@ -33,6 +33,7 @@
 #include "tusb.h"
 #include "uart.h"
 #include "hardware/rtc.h"
+#include "pico/unique_id.h"
 
 #if MICROPY_HW_ENABLE_UART_REPL || MICROPY_HW_ENABLE_USBDEV
 
@@ -164,3 +165,20 @@ uint64_t mp_hal_time_ns(void) {
     uint64_t s = timeutils_seconds_since_epoch(t.year, t.month, t.day, t.hour, t.min, t.sec);
     return s * 1000000000ULL;
 }
+
+// Generate a random locally administered MAC address (LAA)
+void mp_hal_generate_laa_mac(int idx, uint8_t buf[6]) {
+    pico_unique_board_id_t pid;
+    pico_get_unique_board_id(&pid);
+    buf[0] = 0x02; // LAA range
+    buf[1] = (pid.id[7] << 4) | (pid.id[6] & 0xf);
+    buf[2] = (pid.id[5] << 4) | (pid.id[4] & 0xf);
+    buf[3] = (pid.id[3] << 4) | (pid.id[2] & 0xf);
+    buf[4] = pid.id[1];
+    buf[5] = (pid.id[0] << 2) | idx;
+}
+
+// A board can override this if needed
+MP_WEAK void mp_hal_get_mac(int idx, uint8_t buf[6]) {
+    mp_hal_generate_laa_mac(idx, buf);
+}

ports/rp2/mphalport.h

@@ -136,4 +136,13 @@ enum mp_hal_pin_interrupt_trigger {
 
 void mp_hal_pin_interrupt(mp_hal_pin_obj_t pin, mp_obj_t handler, mp_uint_t trigger, bool hard);
 
+enum {
+    MP_HAL_MAC_WLAN0 = 0,
+    MP_HAL_MAC_BDADDR,
+    MP_HAL_MAC_ETH0,
+};
+
+void mp_hal_get_mac(int idx, uint8_t buf[6]);
+void mp_hal_generate_laa_mac(int idx, uint8_t buf[6]);
+
 #endif // MICROPY_INCLUDED_RP2_MPHALPORT_H

ports/rp2/mpnetworkport.c

@@ -39,6 +39,13 @@ static alarm_id_t lwip_alarm_id = -1;
 static bool lwip_can_poll = true;
 static bool lwip_poll_pending = false;
 
+#if MICROPY_PY_WIZNET5K
+static bool wiznet_poll_pending = false;
+
+void wiznet5k_poll(void);
+void wiznet5k_deinit(void);
+#endif
+
 u32_t sys_now(void) {
     // Used by LwIP
     return mp_hal_ticks_ms();
@@ -57,6 +64,13 @@ void lwip_lock_acquire(void) {
 
 void lwip_lock_release(void) {
     lwip_can_poll = false;
+    #if MICROPY_PY_WIZNET5K
+    if (wiznet_poll_pending) {
+        wiznet5k_poll();
+        wiznet_poll_pending = false;
+    }
+    #endif
+
     if (lwip_poll_pending) {
         lwip_poll();
         lwip_poll_pending = false;
@@ -76,11 +90,29 @@ uint32_t lwip_try_poll(void) {
     return ret;
 }
 
+#if MICROPY_PY_WIZNET5K
+void wiznet5k_try_poll(void) {
+    if (lwip_can_poll) {
+        lwip_can_poll = false;
+        wiznet5k_poll();
+        lwip_can_poll = true;
+    } else {
+        wiznet_poll_pending = true;
+    }
+}
+#endif
+
 STATIC int64_t alarm_callback(alarm_id_t id, void *user_data) {
+    #if MICROPY_PY_WIZNET5K
+    wiznet5k_try_poll();
+    #endif
     return lwip_try_poll();
 }
 
 void mod_network_lwip_init(void) {
+    #if MICROPY_PY_WIZNET5K
+    wiznet5k_deinit();
+    #endif
     if (lwip_alarm_id != -1) {
         cancel_alarm(lwip_alarm_id);
     }