pi pico 2w cyw43 wifi and lwip integration #780

ianic · 2025-12-24T00:22:01Z

Here is one more pico wifi implementation ;)...

I started from the initial cyw43 bus implementation and added wifi initialization mostly based on the work from this series of articles and this repo.

Then I copied lwip from Ashet-OS and glue lwip and cyw43.

cyw43 uses lwip provided packet buffers. Lwip is configured to prepare buffers with enough headroom space for cyw43 bus header and command on both send and receive. So both send/receive are zero copy. Packet fragmentation works ok, lwip responds to ping messages with packet size longer than mtu (1500 bytes) and can send fragmented udp packets.

So far I was just testing udp and ping

cyw43.zig rpi example demonstrates:

wifi join
dhcp ip config
udp send
ping responding

Example depends on secrets.zig which is not in the repo and should have content like:

pub const ssid = "...";
pub const pwd = "...";

Receiver ip is currently hard coded so it needs to be updated in the code.

To receive udp packets on the host:

nc -u -l  -p 9999

Besides lwip and foundationlibc includes there are also few configuration files:

modules/lwip/include/lwipopts.h - defines lwip features, pbuf size and number of pbufs
modules/lwip/include/arch/cc.h - export functions
examples/raspberrypi/rp2xxx/srs/lwip_exports.zig - definition of exported functions

Use existing cyw43 driver to blink led on the rpi pico 2w.

Extremly dirty proof of concept. Will be cleaned up, just to store something working. References: https://download.kamami.pl/p1180672-Infineon-CYW43439.pdf https://iosoft.blog/2022/12/06/picowi_part3/ https://github.com/embassy-rs/embassy/blob/main/cyw43-pio/src/lib.rs#L253

Remove write function which requires adding command to the read buffer.

More Zig like, less C like interface.

Use namespaces, avoid repeating cyw43 name in each struct, variable...

Off by 1 after previous refactor.

Make it more Zig like.

Just appears on the network Reference: https://github.com/jbentham/picowi/blob/bb33b1e7a15a685f06dda6764b79e429ce9b325e/lib/picowi_join.c#L46

use packet struct for bit size fields

no need for that huge struct

There we have all information.

Switch to vectored write, from write to writev

don't add word when data len is zero

@TagName

@TagName for unbounded tag without value

No need to pbuf_free after passing it to the netif.input, pbuf ownership is transferred. But needed in other cases like udp_sendto.

Switch to zero copy in cyw43 driver

into separate file, keep lwip.zig chip independednt

removes led_pin variable from cyw43 chip

Replaced by lwip now

mattnite · 2025-12-24T07:24:38Z

Hey @ianic I merged the other wifi PR, and it seems like there are some conflicts in your branch. Once you fix them I'll take a look

ianic · 2025-12-24T08:28:58Z

Hi @mattnite, can you please help me with a thing. I'm stuck with rebasing on #775. After that if the rpi example has exported function build fails.

If I add something like:

export fn sys_now() u32 {
    return 0;
}

in any example (can be blinky.zig) it fails with:

 /home/ianic/.cache/zig/p/N-V-__8AAN5NhBR0oTsvnwjPdeNiiDLtEsfXRHd1fv-R3TOv/zig build-exe -ODebug --dep app -Mroot=/home/ianic/Code/microzig/core/src/generate_root.zig -target thumb-freestanding-eabihf -mcpu cortex_m33+dsp+fp_armv8d16sp --dep microzig -Mapp=/home/ianic/Code/microzig/examples/raspberrypi/rp2xxx/src/blinky.zig --dep config --dep drivers --dep cpu --dep chip --dep hal --dep board --dep app -Mmicrozig=/home/ianic/Code/microzig/core/src/microzig.zig -Mconfig=.zig-cache/c/56f37e7b179445b95e470635223dfd8c/options.zig -ODebug -Mdrivers=/home/ianic/Code/microzig/drivers/framework.zig --dep rtt --dep microzig -Mcpu=/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig --dep microzig -Mchip=.zig-cache/o/81ad655c2785d48a0a87bfcaf2200ef1/chips/RP2350.zig --dep bounded-array --dep microzig -Mhal=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/hal.zig --dep microzig -Mboard=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/boards/raspberry_pi_pico2.zig -ODebug -Mrtt=/home/ianic/Code/microzig/modules/rtt/src/rtt.zig -ODebug -Mbounded-array=/home/ianic/Code/microzig/modules/bounded-array/src/bounded_array.zig --cache-dir .zig-cache --global-cache-dir /home/ianic/.cache/zig --name generate_root --zig-lib-dir /home/ianic/.cache/zig/p/N-V-__8AAN5NhBR0oTsvnwjPdeNiiDLtEsfXRHd1fv-R3TOv/lib/
zsh: segmentation fault (core dumped)  /home/ianic/.cache/zig/p/N-V-__8AAN5NhBR0oTsvnwjPdeNiiDLtEsfXRHd1fv-R3TOv/zig

mattnite · 2025-12-24T09:16:10Z

@ianic I'm about to head to bed, but what operating system are you on? And in the mean time try clearing your cache. Ttyl

ianic · 2025-12-24T09:27:14Z

Thanks,
Arch Linux 6.16.8-arch3-1
Clearing local and global cache didn't help.

mattnite · 2025-12-24T18:30:59Z

@ianic I have an idea, it might be the self-hosted backend hitting a bug and segfaulting. To get around this, go to the root build.zig, look for this chunk of code, and add the indicated line:

            const generate_root_exe = mb.builder.addExecutable(.{
                .name = "generate_root",
                .use_llvm = true, // <---- Add this please
                .root_module = mb.builder.createModule(.{
                    .root_source_file = mb.core_dep.path("src/generate_root.zig"),
                    .target = mb.builder.graph.host,
                    .optimize = .Debug,

                    .imports = &.{
                        .{ .name = "app", .module = app_mod },
                    },
                }),
            });

ianic · 2025-12-24T18:55:15Z

What I find strange is that building generate_root is using target thumb-freestanding-eabihf, this is failing command:

/home/ianic/.build/zig/zig-x86_64-linux-0.15.1/zig build-exe \
    -ODebug \
    --dep app \
    -Mroot=/home/ianic/Code/microzig/core/src/generate_root.zig \
    -target thumb-freestanding-eabihf \
    -mcpu cortex_m33+dsp+fp_armv8d16sp \
    --dep microzig \
    -Mapp=/home/ianic/Code/microzig/examples/raspberrypi/rp2xxx/src/cyw43.zig \
    --dep config \
    --dep drivers \
    --dep cpu \
    --dep chip \
    --dep hal \
    --dep board \
    --dep app \
    -Mmicrozig=/home/ianic/Code/microzig/core/src/microzig.zig \
    -Mconfig=.zig-cache/c/56f37e7b179445b95e470635223dfd8c/options.zig \
    -Mdrivers=/home/ianic/Code/microzig/drivers/framework.zig \
    --dep rtt \
    --dep microzig \
    -Mcpu=/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig \
    --dep microzig \
    -Mchip=.zig-cache/o/c287a30c377e2df95f52a611c231e087/chips/RP2350.zig \
    --dep bounded-array \
    --dep microzig \
    -Mhal=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/hal.zig \
    --dep microzig \
    -Mboard=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/boards/raspberry_pi_pico2.zig \
    -Mrtt=/home/ianic/Code/microzig/modules/rtt/src/rtt.zig \
    -Mbounded-array=/home/ianic/Code/microzig/modules/bounded-array/src/bounded_array.zig \
    --cache-dir .zig-cache \
    --global-cache-dir /home/ianic/.cache/zig \
    --name generate_root \
    --zig-lib-dir /home/ianic/.build/zig/zig-x86_64-linux-0.15.1/lib/

I expected that should be built for the host.
Removing .target = zig_resolved_target, at the line 556 seems to fix this.

Building with .use_llvm = true still fails.

Edit:
removing that line is not the fix trying to build app for host target fails when we reach file which has arm assembly, risc callconv or something target specific.

mattnite · 2025-12-24T21:03:05Z

Great find, I think we were running into some issues for when we were mixing modules and targets, your change makes it more sane by making it so only the root module has a target set.

ianic · 2025-12-24T21:22:50Z

But now build fails because app can't be build for the host target.
For example when I add exported function to the blinky.zig example:

export fn sys_now() u32 {
    const ts = time.get_time_since_boot();
    return @truncate(ts.to_us() / 1000);
}

it fails with wrong callconv for the target

zig build -Dexample=blink
install
└─ install generated to pico2_riscv_blinky.elf
   └─ compile exe pico2_riscv_blinky Debug riscv32-freestanding-eabi
      └─ run exe generate_root (main.zig)
         └─ compile exe generate_root Debug native 1 errors
/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig:37:34: error: calling convention 'riscv32_interrupt' only available on architectures 'riscv32'
    riscv: *const fn () callconv(riscv_calling_convention) void,
                                 ^~~~~~~~~~~~~~~~~~~~~~~~
referenced by:
    InterruptHandler: /home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig:35:37
    InterruptOptions: /home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig:43:58
    20 reference(s) hidden; use '-freference-trace=22' to see all references
error: the following command failed with 1 compilation errors:
/home/ianic/.cache/zig/p/N-V-__8AAN5NhBR0oTsvnwjPdeNiiDLtEsfXRHd1fv-R3TOv/zig build-exe -ODebug --dep app -Mroot=/home/ianic/Code/microzig/core/src/generate_root.zig --dep microzig -Mapp=/home/ianic/Code/microzig/examples/raspberrypi/rp2xxx/src/blinky.zig --dep config --dep drivers --dep cpu --dep chip --dep hal --dep board --dep app -Mmicrozig=/home/ianic/Code/microzig/core/src/microzig.zig -Mconfig=.zig-cache/c/6b0844f2b1a728ab54a26f03ed960fcc/options.zig -ODebug -Mdrivers=/home/ianic/Code/microzig/drivers/framework.zig --dep riscv32-common --dep microzig -Mcpu=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig --dep microzig -Mchip=.zig-cache/o/195ff184b0c1a0e189b705b8b871db74/chips/RP2350.zig --dep bounded-array --dep microzig -Mhal=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/hal.zig --dep microzig -Mboard=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/boards/raspberry_pi_pico2.zig -Mriscv32-common=/home/ianic/Code/microzig/modules/riscv32-common/src/riscv32_common.zig -ODebug -Mbounded-array=/home/ianic/Code/microzig/modules/bounded-array/src/bounded_array.zig --cache-dir .zig-cache --global-cache-dir /home/ianic/.cache/zig --name generate_root --zig-lib-dir /home/ianic/.cache/zig/p/N-V-__8AAN5NhBR0oTsvnwjPdeNiiDLtEsfXRHd1fv-R3TOv/lib/ --listen=-
install
└─ install generated to pico2_riscv_flashless_blinky.uf2
   └─ run exe elf2uf2 (output.uf2)
      └─ compile exe pico2_riscv_flashless_blinky Debug riscv32-freestanding-eabi
         └─ run exe generate_root (main.zig)
            └─ compile exe generate_root Debug native 1 errors
/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig:37:34: error: calling convention 'riscv32_interrupt' only available on architectures 'riscv32'
    riscv: *const fn () callconv(riscv_calling_convention) void,
                                 ^~~~~~~~~~~~~~~~~~~~~~~~

If I understand correctly: it builds generate_root for the host target, generate_root depends on app, app can't be built for the host target.

mattnite · 2025-12-25T01:30:51Z

What version of zig are you using? I didn't see any issues building rpi examples

ianic · 2025-12-25T10:22:55Z

zig 0.15.1

I'm also successfully compiling examples. But when I add exported function to the example then compile fails.

This blinky.zig fails to compile:

const std = @import("std");
const microzig = @import("microzig");
const rp2xxx = microzig.hal;
const time = rp2xxx.time;

const pin_config: rp2xxx.pins.GlobalConfiguration = .{
    .GPIO25 = .{
        .name = "led",
        .direction = .out,
    },
};

const pins = pin_config.pins();

pub fn main() !void {
    pin_config.apply();

    while (true) {
        pins.led.toggle();
        time.sleep_ms(250);
    }
}

export fn sys_now() u32 {
    const ts = time.get_time_since_boot();
    return @truncate(ts.to_us() / 1000);
}

microzig/examples/raspberrypi/rp2xxx ❯ zig build -Dexample=blink

install
└─ install generated to pico_flashless_blinky.uf2
   └─ run exe elf2uf2 (output.uf2)
      └─ compile exe pico_flashless_blinky Debug thumb-freestanding-eabi
         └─ run exe generate_root (main.zig)
            └─ compile exe generate_root Debug native 3 errors
/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig:152:9: error: invalid mnemonic: 'cpsid'
    pub fn disable_interrupts() void {
    ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig:148:9: error: invalid mnemonic: 'cpsie'
    pub fn enable_interrupts() void {
    ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig:140:9: error: invalid mnemonic: 'mrs'
    pub fn globally_enabled() bool {
    ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
error: the following command failed with 3 compilation errors:
/home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/zig build-exe -ODebug --dep app -Mroot=/home/ianic/Code/microzig/core/src/generate_root.zig --dep microzig -Mapp=/home/ianic/Code/microzig/examples/raspberrypi/rp2xxx/src/blinky.zig --dep config --dep drivers --dep cpu --dep chip --dep hal --dep board --dep app -Mmicrozig=/home/ianic/Code/microzig/core/src/microzig.zig -Mconfig=.zig-cache/c/e6c4197b08344097803d0d459f90e66c/options.zig -ODebug -Mdrivers=/home/ianic/Code/microzig/drivers/framework.zig --dep rtt --dep microzig -Mcpu=/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig --dep microzig -Mchip=.zig-cache/o/9d343f38ac137f9316feded030f55e84/chips/RP2040.zig --dep bounded-array --dep microzig -Mhal=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/hal.zig --dep bootloader --dep microzig -Mboard=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/boards/raspberry_pi_pico.zig -ODebug -Mrtt=/home/ianic/Code/microzig/modules/rtt/src/rtt.zig -ODebug -Mbounded-array=/home/ianic/Code/microzig/modules/bounded-array/src/bounded_array.zig -Mbootloader=.zig-cache/o/2720d8753bdaffa20c5d29c898980c03/w25q080.bin --cache-dir .zig-cache --global-cache-dir /home/ianic/.cache/zig --name generate_root --zig-lib-dir /home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/lib/ --listen=-
install
└─ install generated to pico_blinky.uf2
   └─ run exe elf2uf2 (output.uf2)
      └─ compile exe pico_blinky Debug thumb-freestanding-eabi
         └─ run exe generate_root (main.zig)
            └─ compile exe generate_root Debug native 3 errors
/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig:152:9: error: invalid mnemonic: 'cpsid'
    pub fn disable_interrupts() void {
    ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig:148:9: error: invalid mnemonic: 'cpsie'
    pub fn enable_interrupts() void {
    ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig:140:9: error: invalid mnemonic: 'mrs'
    pub fn globally_enabled() bool {
    ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
error: the following command failed with 3 compilation errors:
/home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/zig build-exe -ODebug --dep app -Mroot=/home/ianic/Code/microzig/core/src/generate_root.zig --dep microzig -Mapp=/home/ianic/Code/microzig/examples/raspberrypi/rp2xxx/src/blinky.zig --dep config --dep drivers --dep cpu --dep chip --dep hal --dep board --dep app -Mmicrozig=/home/ianic/Code/microzig/core/src/microzig.zig -Mconfig=.zig-cache/c/7575016d361e32c39b5caa904d36b9db/options.zig -ODebug -Mdrivers=/home/ianic/Code/microzig/drivers/framework.zig --dep rtt --dep microzig -Mcpu=/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig --dep microzig -Mchip=.zig-cache/o/9d343f38ac137f9316feded030f55e84/chips/RP2040.zig --dep bounded-array --dep microzig -Mhal=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/hal.zig --dep bootloader --dep microzig -Mboard=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/boards/raspberry_pi_pico.zig -ODebug -Mrtt=/home/ianic/Code/microzig/modules/rtt/src/rtt.zig -ODebug -Mbounded-array=/home/ianic/Code/microzig/modules/bounded-array/src/bounded_array.zig -Mbootloader=.zig-cache/o/2720d8753bdaffa20c5d29c898980c03/w25q080.bin --cache-dir .zig-cache --global-cache-dir /home/ianic/.cache/zig --name generate_root --zig-lib-dir /home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/lib/ --listen=-
install
└─ install generated to pico2_riscv_flashless_blinky.elf
   └─ compile exe pico2_riscv_flashless_blinky Debug riscv32-freestanding-eabi
      └─ run exe generate_root (main.zig)
         └─ compile exe generate_root Debug native 1 errors
/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig:37:34: error: calling convention 'riscv32_interrupt' only available on architectures 'riscv32'
    riscv: *const fn () callconv(riscv_calling_convention) void,
                                 ^~~~~~~~~~~~~~~~~~~~~~~~
referenced by:
    InterruptHandler: /home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig:35:37
    InterruptOptions: /home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig:43:58
    20 reference(s) hidden; use '-freference-trace=22' to see all references
error: the following command failed with 1 compilation errors:
/home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/zig build-exe -ODebug --dep app -Mroot=/home/ianic/Code/microzig/core/src/generate_root.zig --dep microzig -Mapp=/home/ianic/Code/microzig/examples/raspberrypi/rp2xxx/src/blinky.zig --dep config --dep drivers --dep cpu --dep chip --dep hal --dep board --dep app -Mmicrozig=/home/ianic/Code/microzig/core/src/microzig.zig -Mconfig=.zig-cache/c/3700faaf9bc3214304f637ce193f1f5e/options.zig -ODebug -Mdrivers=/home/ianic/Code/microzig/drivers/framework.zig --dep riscv32-common --dep microzig -Mcpu=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig --dep microzig -Mchip=.zig-cache/o/618fbfeaf3ad74ac5b6216a4202052cb/chips/RP2350.zig --dep bounded-array --dep microzig -Mhal=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/hal.zig --dep microzig -Mboard=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/boards/raspberry_pi_pico2.zig -Mriscv32-common=/home/ianic/Code/microzig/modules/riscv32-common/src/riscv32_common.zig -ODebug -Mbounded-array=/home/ianic/Code/microzig/modules/bounded-array/src/bounded_array.zig --cache-dir .zig-cache --global-cache-dir /home/ianic/.cache/zig --name generate_root --zig-lib-dir /home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/lib/ --listen=-
install
└─ install generated to pico2_riscv_blinky.elf
   └─ compile exe pico2_riscv_blinky Debug riscv32-freestanding-eabi
      └─ run exe generate_root (main.zig)
         └─ compile exe generate_root Debug native 1 errors
/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig:37:34: error: calling convention 'riscv32_interrupt' only available on architectures 'riscv32'
    riscv: *const fn () callconv(riscv_calling_convention) void,
                                 ^~~~~~~~~~~~~~~~~~~~~~~~
referenced by:
    InterruptHandler: /home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig:35:37
    InterruptOptions: /home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig:43:58
    20 reference(s) hidden; use '-freference-trace=22' to see all references
error: the following command failed with 1 compilation errors:
/home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/zig build-exe -ODebug --dep app -Mroot=/home/ianic/Code/microzig/core/src/generate_root.zig --dep microzig -Mapp=/home/ianic/Code/microzig/examples/raspberrypi/rp2xxx/src/blinky.zig --dep config --dep drivers --dep cpu --dep chip --dep hal --dep board --dep app -Mmicrozig=/home/ianic/Code/microzig/core/src/microzig.zig -Mconfig=.zig-cache/c/feca2abefd707535129c150aec15a09b/options.zig -ODebug -Mdrivers=/home/ianic/Code/microzig/drivers/framework.zig --dep riscv32-common --dep microzig -Mcpu=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/cpus/hazard3.zig --dep microzig -Mchip=.zig-cache/o/618fbfeaf3ad74ac5b6216a4202052cb/chips/RP2350.zig --dep bounded-array --dep microzig -Mhal=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/hal.zig --dep microzig -Mboard=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/boards/raspberry_pi_pico2.zig -Mriscv32-common=/home/ianic/Code/microzig/modules/riscv32-common/src/riscv32_common.zig -ODebug -Mbounded-array=/home/ianic/Code/microzig/modules/bounded-array/src/bounded_array.zig --cache-dir .zig-cache --global-cache-dir /home/ianic/.cache/zig --name generate_root --zig-lib-dir /home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/lib/ --listen=-
install
└─ install generated to pico2_arm_blinky.elf
   └─ compile exe pico2_arm_blinky Debug thumb-freestanding-eabihf
      └─ run exe generate_root (main.zig)
         └─ compile exe generate_root Debug native 1 errors
/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/hal/bootmeta.zig:46:5: error: Unimplemented: ExportOptions.section
    @export(&image_def_block, .{
    ^~~~~~~
error: the following command failed with 1 compilation errors:
/home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/zig build-exe -ODebug --dep app -Mroot=/home/ianic/Code/microzig/core/src/generate_root.zig --dep microzig -Mapp=/home/ianic/Code/microzig/examples/raspberrypi/rp2xxx/src/blinky.zig --dep config --dep drivers --dep cpu --dep chip --dep hal --dep board --dep app -Mmicrozig=/home/ianic/Code/microzig/core/src/microzig.zig -Mconfig=.zig-cache/c/bf79d601f9027bfca29cb33e0f2bc88f/options.zig -ODebug -Mdrivers=/home/ianic/Code/microzig/drivers/framework.zig --dep rtt --dep microzig -Mcpu=/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig --dep microzig -Mchip=.zig-cache/o/47f8ee93655841f876fe0ac0555ed732/chips/RP2350.zig --dep bounded-array --dep microzig -Mhal=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/hal.zig --dep microzig -Mboard=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/boards/raspberry_pi_pico2.zig -ODebug -Mrtt=/home/ianic/Code/microzig/modules/rtt/src/rtt.zig -ODebug -Mbounded-array=/home/ianic/Code/microzig/modules/bounded-array/src/bounded_array.zig --cache-dir .zig-cache --global-cache-dir /home/ianic/.cache/zig --name generate_root --zig-lib-dir /home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/lib/ --listen=-
install
└─ install generated to pico2_arm_flashless_blinky.elf
   └─ compile exe pico2_arm_flashless_blinky Debug thumb-freestanding-eabihf
      └─ run exe generate_root (main.zig)
         └─ compile exe generate_root Debug native 4 errors
/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig:715:40: error: expected type 'u32', found 'usize'
              [start_fn] "r" (@as(u32, @intFromPtr(&_start))),
                                       ^~~~~~~~~~~~~~~~~~~~
/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig:715:40: note: unsigned 32-bit int cannot represent all possible unsigned 64-bit values
referenced by:
    image_def_block: /home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/hal/bootmeta.zig:23:49
    comptime: /home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/hal/bootmeta.zig:46:14
    14 reference(s) hidden; use '-freference-trace=16' to see all references
/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig:737:39: error: no field named 'r0' in struct 'builtin.assembly.Clobbers__struct_4021'
                : .{ .memory = true, .r0 = true, .r1 = true });
                                      ^~
/home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/lib/std/builtin/assembly.zig:2:29: note: struct declared here
    .x86, .x86_64 => packed struct {
                     ~~~~~~~^~~~~~
/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig:909:13: error: invalid constraint: 's'
            fn invoke() callconv(.c) void {
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig:909:13: error: invalid constraint: 's'
            fn invoke() callconv(.c) void {
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
error: the following command failed with 4 compilation errors:
/home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/zig build-exe -ODebug --dep app -Mroot=/home/ianic/Code/microzig/core/src/generate_root.zig --dep microzig -Mapp=/home/ianic/Code/microzig/examples/raspberrypi/rp2xxx/src/blinky.zig --dep config --dep drivers --dep cpu --dep chip --dep hal --dep board --dep app -Mmicrozig=/home/ianic/Code/microzig/core/src/microzig.zig -Mconfig=.zig-cache/c/bfaaf5d82b48db647017e2f748112c65/options.zig -ODebug -Mdrivers=/home/ianic/Code/microzig/drivers/framework.zig --dep rtt --dep microzig -Mcpu=/home/ianic/Code/microzig/core/src/cpus/cortex_m.zig --dep microzig -Mchip=.zig-cache/o/47f8ee93655841f876fe0ac0555ed732/chips/RP2350.zig --dep bounded-array --dep microzig -Mhal=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/hal.zig --dep microzig -Mboard=/home/ianic/Code/microzig/port/raspberrypi/rp2xxx/src/boards/raspberry_pi_pico2.zig -ODebug -Mrtt=/home/ianic/Code/microzig/modules/rtt/src/rtt.zig -ODebug -Mbounded-array=/home/ianic/Code/microzig/modules/bounded-array/src/bounded_array.zig --cache-dir .zig-cache --global-cache-dir /home/ianic/.cache/zig --name generate_root --zig-lib-dir /home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/lib/ --listen=-

Build Summary: 63/100 steps succeeded; 6 failed
install transitive failure
├─ install generated to pico_flashless_blinky.uf2 transitive failure
│  └─ run exe elf2uf2 (output.uf2) transitive failure
│     └─ compile exe pico_flashless_blinky Debug thumb-freestanding-eabi transitive failure
│        └─ run exe generate_root (main.zig) transitive failure
│           └─ compile exe generate_root Debug native 3 errors
├─ install generated to pico_flashless_blinky.elf transitive failure
│  └─ compile exe pico_flashless_blinky Debug thumb-freestanding-eabi (+5 more reused dependencies)
├─ install generated to pico2_arm_flashless_blinky.uf2 transitive failure
│  └─ run exe elf2uf2 (output.uf2) transitive failure
│     └─ compile exe pico2_arm_flashless_blinky Debug thumb-freestanding-eabihf transitive failure
│        └─ run exe generate_root (main.zig) transitive failure
│           └─ compile exe generate_root Debug native 4 errors
├─ install generated to pico2_arm_flashless_blinky.elf transitive failure
│  └─ compile exe pico2_arm_flashless_blinky Debug thumb-freestanding-eabihf (+4 more reused dependencies)
├─ install generated to pico2_riscv_flashless_blinky.uf2 transitive failure
│  └─ run exe elf2uf2 (output.uf2) transitive failure
│     └─ compile exe pico2_riscv_flashless_blinky Debug riscv32-freestanding-eabi transitive failure
│        └─ run exe generate_root (main.zig) transitive failure
│           └─ compile exe generate_root Debug native 1 errors
├─ install generated to pico2_riscv_flashless_blinky.elf transitive failure
│  └─ compile exe pico2_riscv_flashless_blinky Debug riscv32-freestanding-eabi (+4 more reused dependencies)
├─ install generated to pico_blinky.uf2 transitive failure
│  └─ run exe elf2uf2 (output.uf2) transitive failure
│     └─ compile exe pico_blinky Debug thumb-freestanding-eabi transitive failure
│        └─ run exe generate_root (main.zig) transitive failure
│           └─ compile exe generate_root Debug native 3 errors
├─ install generated to pico_blinky.elf transitive failure
│  └─ compile exe pico_blinky Debug thumb-freestanding-eabi (+5 more reused dependencies)
├─ install generated to pico2_arm_blinky.uf2 transitive failure
│  └─ run exe elf2uf2 (output.uf2) transitive failure
│     └─ compile exe pico2_arm_blinky Debug thumb-freestanding-eabihf transitive failure
│        └─ run exe generate_root (main.zig) transitive failure
│           └─ compile exe generate_root Debug native 1 errors
├─ install generated to pico2_arm_blinky.elf transitive failure
│  └─ compile exe pico2_arm_blinky Debug thumb-freestanding-eabihf (+4 more reused dependencies)
├─ install generated to pico2_riscv_blinky.uf2 transitive failure
│  └─ run exe elf2uf2 (output.uf2) transitive failure
│     └─ compile exe pico2_riscv_blinky Debug riscv32-freestanding-eabi transitive failure
│        └─ run exe generate_root (main.zig) transitive failure
│           └─ compile exe generate_root Debug native 1 errors
└─ install generated to pico2_riscv_blinky.elf transitive failure
   └─ compile exe pico2_riscv_blinky Debug riscv32-freestanding-eabi (+4 more reused dependencies)

error: the following build command failed with exit code 1:
.zig-cache/o/b69b767ec331fe48e217bbd8fc16364d/build /home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/zig /home/ianic/.cache/zig/p/N-V-__8AANeVhBSiRwesZrZKZ1hTkJd-goYzJWpN6kwXi-FJ/lib /home/ianic/Code/microzig/examples/raspberrypi/rp2xxx .zig-cache /home/ianic/.cache/zig --seed 0xd503e931 -Z5c6c2599fddcfeb1 -Dexample=blink

Is it working for you with those exported function also?
Sorry for bothering you so much if that is only my local problem.

ianic added 30 commits December 23, 2025 22:37

make pico 2w blink

fb7cfbc

Use existing cyw43 driver to blink led on the rpi pico 2w.

cleanup spi interface

b545e3d

Remove write function which requires adding command to the read buffer.

refector rp2xxx part

94a93a3

More Zig like, less C like interface.

refactor driver part of the cyw43 interface

c1bebad

Use namespaces, avoid repeating cyw43 name in each struct, variable...

remove extra word from ioctl.Request

24bc527

fix write buffer len

b18c295

Off by 1 after previous refactor.

refactor bus read/write function

72b4ddc

Make it more Zig like.

refactor bus init

47c84bf

refactor runner init

a0fbe86

add references to the datasheet

26fbb95

wifi join

ce45723

Just appears on the network Reference: https://github.com/jbentham/picowi/blob/bb33b1e7a15a685f06dda6764b79e429ce9b325e/lib/picowi_join.c#L46

parse ioctl events

7f91fd0

refactor runner functions

8fb13c5

encode ssid and pwd in join

8aa2e0f

refactor led toggling

528c90a

respond to arp

18be81c

responding to ping

a7c337b

refactor Ip fields

b2165f2

use packet struct for bit size fields

shrink ioctl.Request

caca876

no need for that huge struct

move tx buffer to the runner

81ecbb7

There we have all information.

arp request get mac address from ip

3656f06

refactor spi interface

a10eaf7

Switch to vectored write, from write to writev

sending udp packet

23f5112

refactor checksum calculation

63a3fa4

add udp checksum calculation

3caac8d

make bus.zig testable

77ee2db

fix additional zeroes in output

e6f4420

refactorings

12c69bc

move buffer to the main

6afd400

ianic added 20 commits December 23, 2025 22:49

rethink tx/rx buffers

fad1a35

refactor udp.send

59509d8

add comment

cd2004b

working udp send using lwip

41496e4

refactorings

e9f2d4d

use single buffer in wifi

2cd1003

fix test

f57443a

don't add word when data len is zero

remove redundancy in names

4296853

fix panic

a13c9eb

@TagName for unbounded tag without value

fix panic on reassemble

25d1087

No need to pbuf_free after passing it to the netif.input, pbuf ownership is transferred. But needed in other cases like udp_sendto.

i still don't understand how to get interrupt

1133d43

cleanup interrupt try

fecc182

use lwip protocol buffers

121f8ea

Switch to zero copy in cyw43 driver

refactor consts to namespaced variables

134848b

logging without fixed buffer

0cdd110

extract chip depended lwip exports

7280a7b

into separate file, keep lwip.zig chip independednt

add gpio like interface for led blink

7279d98

removes led_pin variable from cyw43 chip

add lwip as module

2ca85d2

remove experimental net implementation

44c960f

Replaced by lwip now

fix rebase

0d5bc29

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pi pico 2w cyw43 wifi and lwip integration #780

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