lwip for rpi pico 2w

drivers/build.zig.zon

@@ -1,6 +1,7 @@
 .{
     .name = .mz_drivers,
     .fingerprint = 0x576453eedc5af46e,
+    .minimum_zig_version = "0.15.1",
     .version = "0.0.1",
     .paths = .{
         "build.zig",

drivers/framework.zig

@@ -77,6 +77,8 @@ pub const wireless = struct {
     pub const Cyw43_Bus = cyw43_bus.Cyw43_Bus;
     pub const Cyw43_Runner = cyw43_runner.Cyw43_Runner;
     // pub const sx1278 = @import("wireless/sx1278.zig");
+
+    pub const Cyw43439 = @import("wireless/cyw43439.zig");
 };
 
 pub const time = struct {

drivers/wireless/cyw43439.zig

@@ -0,0 +1,99 @@
+const std = @import("std");
+const mem = std.mem;
+const assert = std.debug.assert;
+
+const Bus = @import("cyw43439/bus.zig");
+const WiFi = @import("cyw43439/wifi.zig");
+
+const log = std.log.scoped(.cyw43);
+
+const Self = @This();
+
+bus: Bus = undefined,
+wifi: WiFi = undefined,
+mac: [6]u8 = @splat(0),
+
+pub fn init(
+    self: *Self,
+    spi: Bus.Spi,
+    sleep_ms: *const fn (delay: u32) void,
+) !void {
+    self.bus = .{ .spi = spi, .sleep_ms = sleep_ms };
+    try self.bus.init();
+
+    self.wifi = .{ .bus = &self.bus };
+    try self.wifi.init();
+
+    self.mac = try self.read_mac();
+}
+
+pub fn join(self: *Self, ssid: []const u8, pwd: []const u8, opt: WiFi.JoinOptions) !void {
+    try self.wifi.join(ssid, pwd, opt);
+}
+
+fn show_clm_ver(self: *Self) !void {
+    var data: [128]u8 = @splat(0);
+    const n = try self.wifi.get_var("clmver", &data);
+    var iter = mem.splitScalar(u8, data[0..n], 0x0a);
+    log.debug("clmver:", .{});
+    while (iter.next()) |line| {
+        if (line.len == 0 or line[0] == 0x00) continue;
+        log.debug("  {s}", .{line});
+    }
+}
+
+fn read_mac(self: *Self) ![6]u8 {
+    var mac: [6]u8 = @splat(0);
+    const n = try self.wifi.get_var("cur_etheraddr", &mac);
+    if (n != mac.len) {
+        log.err("read_mac unexpected read bytes: {}", .{n});
+        return error.ReadMacFailed;
+    }
+    return mac;
+}
+
+pub fn recv_zc(ptr: *anyopaque, bytes: []u8) anyerror!?struct { usize, usize } {
+    const self: *Self = @ptrCast(@alignCast(ptr));
+    return self.wifi.recv_zc(bytes);
+}
+
+pub fn send_zc(ptr: *anyopaque, bytes: []u8) anyerror!void {
+    const self: *Self = @ptrCast(@alignCast(ptr));
+    try self.wifi.send_zc(bytes);
+}
+
+pub fn ready(ptr: *anyopaque) bool {
+    const self: *Self = @ptrCast(@alignCast(ptr));
+    return self.wifi.has_credit();
+}
+
+pub fn gpio(self: *Self, pin: u2) Pin {
+    assert(pin < 3);
+    self.wifi.gpio_enable(pin);
+    return .{
+        .pin = pin,
+        .wifi = &self.wifi,
+    };
+}
+
+pub const Pin = struct {
+    pin: u2,
+    wifi: *WiFi,
+
+    pub fn get(self: *Pin) bool {
+        return self.wifi.gpio_get(self.pin);
+    }
+
+    pub fn put(self: *Pin, value: u1) void {
+        self.wifi.gpio_set(self.pin, value);
+    }
+
+    pub fn toggle(self: *Pin) void {
+        self.wifi.gpio_toggle(self.pin);
+    }
+};
+
+// References:
+//   https://github.com/embassy-rs/embassy/blob/abb1d8286e2415686150e2e315ca1c380659c3c3/cyw43/src/consts.rs
+//   https://github.com/jbentham/picowi/blob/main/lib/picowi_regs.h
+//   https://github.com/georgerobotics/cyw43-driver/blob/dd7568229f3bf7a37737b9e1ef250c26efe75b23/src/cyw43_ll.c#L126