WFI with interrupt-driven wakeup for USB and W6300

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);

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();