diff --git a/firmware/lib/dispatch.cpp b/firmware/lib/dispatch.cpp
index b303f88..2e79966 100644
--- a/firmware/lib/dispatch.cpp
+++ b/firmware/lib/dispatch.cpp
@@ -8,6 +8,7 @@
 #include "timer_queue.h"
 #include "net.h"
 #include "debug_log.h"
+#include "hardware/sync.h"
 
 static timer_queue timers;
 
@@ -39,6 +40,8 @@ void dispatch_schedule_ms(uint32_t ms, std::function<void()> fn) {
     });
 
     while (true) {
+        uint32_t save = save_and_disable_interrupts();
+
         dlog_if_slow("tud_task", 1000, [&]{ tud_task(); });
         dlog_if_slow("drain", 1000, [&]{ usb.drain(); });
         dlog_if_slow("timers", 1000, [&]{ timers.run(); });
@@ -76,6 +79,7 @@ void dispatch_schedule_ms(uint32_t ms, std::function<void()> fn) {
             }
         }
 
-        // __wfi();
+        __wfi();
+        restore_interrupts(save);
     }
 }
diff --git a/firmware/lib/net.cpp b/firmware/lib/net.cpp
index b5ab3fa..af82c8f 100644
--- a/firmware/lib/net.cpp
+++ b/firmware/lib/net.cpp
@@ -283,6 +283,10 @@ bool net_init() {
 
     w6300::open_socket(raw_socket, w6300::protocol::macraw, w6300::port_num{0}, w6300::sock_flag::none);
     w6300::set_socket_io_mode(raw_socket, w6300::sock_io_mode::nonblock);
+    // CHECK START
+    w6300::set_socket_interrupt_mask(raw_socket, 0x04);
+    w6300::set_interrupt_mask(w6300::ik_sock_0);
+    // CHECK END
 
     return true;
 }
@@ -296,6 +300,7 @@ void net_set_handler(net_handler handler) {
 }
 
 void net_poll() {
+    w6300::clear_interrupt(w6300::ik_int_all);
     if (w6300::get_socket_recv_buf(raw_socket) == 0) return;
     static uint8_t rx_buf[1518];
     w6300::ip_address dummy_addr = {};
diff --git a/firmware/w6300/w6300.cpp b/firmware/w6300/w6300.cpp
index 4e8b001..ed368f3 100644
--- a/firmware/w6300/w6300.cpp
+++ b/firmware/w6300/w6300.cpp
@@ -71,11 +71,15 @@ void pio_init() {
         gpio_put(pin, false);
     }
     gpio_init(PIN_CS);
+    // CHECK START
     gpio_set_dir(PIN_CS, GPIO_OUT);
     gpio_put(PIN_CS, true);
     gpio_init(PIN_INT);
     gpio_set_dir(PIN_INT, GPIO_IN);
-    gpio_set_pulls(PIN_INT, false, false);
+    gpio_pull_up(PIN_INT);
+    gpio_set_irq_enabled_with_callback(PIN_INT, GPIO_IRQ_EDGE_FALL, true,
+        [](uint, uint32_t){});
+    // CHECK END
 
     pio_hw_t *pios[2] = {pio0, pio1};
     uint pio_index = 1;
@@ -822,11 +826,15 @@ inline uint16_t get_sn_rx_wr(uint8_t sn) { return ((uint16_t)reg_read(REG_SN_RX_
 static critical_section_t g_cris_sec;
 
 void cris_enter() {
-    critical_section_enter_blocking(&g_cris_sec);
+    // CHECK START
+    // critical_section_enter_blocking(&g_cris_sec);
+    // CHECK END
 }
 
 void cris_exit() {
-    critical_section_exit(&g_cris_sec);
+    // CHECK START
+    // critical_section_exit(&g_cris_sec);
+    // CHECK END
 }
 
 static uint8_t make_opcode(uint32_t addr, uint8_t rw) {
@@ -1647,6 +1655,11 @@ void init_net(const net_info& info) {
     set_net_info(info);
 }
 
+void enable_interrupt_pin() {
+    chip_unlock();
+    set_sycr1(get_sycr1() | SYCR1_IEN);
+}
+
 std::expected<void, sock_error> set_socket_io_mode(socket_id sid, sock_io_mode mode) {
     uint8_t sn = static_cast<uint8_t>(sid);
     if (sn >= sock_count) FAIL(sock_num);
diff --git a/firmware/w6300/w6300.h b/firmware/w6300/w6300.h
index 212431b..b956041 100644
--- a/firmware/w6300/w6300.h
+++ b/firmware/w6300/w6300.h
@@ -195,6 +195,7 @@ int8_t init_buffers(std::span<const uint8_t> txsize, std::span<const uint8_t> rx
 void clear_interrupt(intr_kind intr);
 intr_kind get_interrupt();
 void set_interrupt_mask(intr_kind intr);
+void enable_interrupt_pin();
 intr_kind get_interrupt_mask();
 
 int8_t get_phy_link();