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Arduino using Zig!

License: MIT License

Zig 100.00%

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avr-arduino-zig's Issues

Use ravedude instead of avrdude

I suggest changing the use of avrdude for build upload to ravedude, avoiding the need to manually find and pass the device where the arduino is located.

About ravedude: It's an avrdude wrapper first made for use with Rust and cargo run, automatically selecting the port the arduino is connected to as well as board and programmer arguments depending on the board name passed to ravedude.

While this would add another dependency in ravedude, it would also remove the requirement to manually specify avrdude arguments, including the correct tty device the arduino is connected to.

The changes to build.zig would be:

Remove the `flash_command' constant
change the definition of the avrdude constant with

const avrdude = b.addSystemCommand(&.{
        "ravedude",
        "uno",
        bin_path,
    })

Update to v0.10 (stage3)

I have made some modifications (nothing conclusive to the point of sending MR).
However, I could not solve the last error involving the linker (ld) not recognizing memcpy.

Output:

error: ld.lld: undefined symbol: memcpy
    note: referenced by main.zig:25
    note:               /home/kassane/Documentos/Projetos/avr-arduino-zig/zig-cache/o/0ab5a5c493c713136f428c7e79480d08/avr-arduino-zig.o:(_start)
error: avr-arduino-zig...
error: The following command exited with error code 1:
/home/kassane/.local/bin/zig build-exe -freference-trace=256 /home/kassane/Documentos/Projetos/avr-arduino-zig/src/start.zig -OReleaseSafe --cache-dir /home/kassane/Documentos/Projetos/avr-arduino-zig/zig-cache --global-cache-dir /home/kassane/.cache/zig --name avr-arduino-zig -fno-compiler-rt -target avr-freestanding-none -mcpu atmega328p --script /home/kassane/Documentos/Projetos/avr-arduino-zig/src/linker.ld --enable-cache

Changes:

diff --git a/build.zig b/build.zig
index 09ec19d..f492a75 100644
--- a/build.zig
+++ b/build.zig
@@ -29,11 +29,11 @@ pub fn build(b: *Builder) !void {
         try tmp.appendSlice("-Uflash:w:");
         try tmp.appendSlice(bin_path);
         try tmp.appendSlice(":e");
-        break :blk tmp.toOwnedSlice();
+        break :blk tmp.toOwnedSlice() catch unreachable;
     };
 
     const upload = b.step("upload", "Upload the code to an Arduino device using avrdude");
-    const avrdude = b.addSystemCommand(&.{
+    const avrdude = b.addSystemCommand(&[_][]const u8{
         "avrdude",
         "-carduino",
         "-patmega328p",
@@ -46,7 +46,7 @@ pub fn build(b: *Builder) !void {
     avrdude.step.dependOn(&exe.install_step.?.step);
 
     const objdump = b.step("objdump", "Show dissassembly of the code using avr-objdump");
-    const avr_objdump = b.addSystemCommand(&.{
+    const avr_objdump = b.addSystemCommand(&[_][]const u8{
         "avr-objdump",
         "-dh",
         bin_path,
@@ -55,7 +55,7 @@ pub fn build(b: *Builder) !void {
     avr_objdump.step.dependOn(&exe.install_step.?.step);
 
     const monitor = b.step("monitor", "Opens a monitor to the serial output");
-    const screen = b.addSystemCommand(&.{
+    const screen = b.addSystemCommand(&[_][]const u8{
         "screen",
         tty,
         "115200",
diff --git a/src/atmega328p.zig b/src/atmega328p.zig
index 06d4880..35b21bb 100644
--- a/src/atmega328p.zig
+++ b/src/atmega328p.zig
@@ -1313,8 +1313,8 @@ pub fn mmioInt(addr: usize, comptime size: usize, comptime T: type) *volatile Mm
 }
 
 const InterruptVector = extern union {
-    C: fn () callconv(.C) void,
-    Naked: fn () callconv(.Naked) void,
+    C: *const fn () callconv(.C) void,
+    Naked: *const fn () callconv(.Naked) void,
     // Interrupt is not supported on arm
 };
 
diff --git a/src/start.zig b/src/start.zig
index 596febc..e60f677 100644
--- a/src/start.zig
+++ b/src/start.zig
@@ -4,8 +4,12 @@ const uart = @import("uart.zig");
 const std = @import("std");
 const builtin = std.builtin;
 
-export const vector_table linksection(".vectors") = blk: {
-    std.debug.assert(std.mem.eql(u8, "RESET", std.meta.fields(atmega328p.VectorTable)[0].name));
+comptime {
+    @export(vector_table, .{ .name = "vector_table", .linkage = .Strong });
+}
+
+const vector_table linksection(".vectors") = blk: {
+    // std.debug.assert(std.mem.eql(u8, "RESET", std.meta.fields(atmega328p.VectorTable)[0].name));
     var asm_str: []const u8 = "jmp _start\n";
 
     const has_interrupts = @hasDecl(main, "interrupts");
@@ -57,7 +61,13 @@ export const vector_table linksection(".vectors") = blk: {
         asm_str = asm_str ++ new_insn ++ "\n";
     }
 
-    break :blk asm (asm_str);
+    const T = struct {
+        fn _start() callconv(.Naked) void {
+            asm volatile (asm_str);
+        }
+    };
+
+    break :blk T._start;
 };
 
 export fn _unhandled_vector() void {
@@ -122,7 +132,7 @@ fn clear_bss() void {
     // Probably a good idea to add clobbers here, but compiler doesn't seem to care
 }
 
-pub fn panic(msg: []const u8, error_return_trace: ?*builtin.StackTrace) noreturn {
+pub fn panic(msg: []const u8, error_return_trace: ?*builtin.StackTrace, _: ?usize) noreturn {
     // Currently assumes that the uart is initialized in main().
     uart.write("PANIC: ");
     uart.write(msg);

Update for Zig 0.8.0

zig build won't compile due to update in 0.8.0 release:

@import("builtin") no longer re-exports std.builtin

StackTrace struct is now accessed via @import("std").builtin.StackTrace

Updating start.zig panic function to:
error_return_trace: ?*@import("std").builtin.StackTrace solves the issue.

Update to zig 0.11.0

I am trying to build this project using zig 0.11.0. After fixing some syntax in build.zig to get the compiler happy:

const std = @import("std");

pub fn build(b: *std.Build) !void {
    const uno = std.zig.CrossTarget{
        .cpu_arch = .avr,
        .cpu_model = .{ .explicit = &std.Target.avr.cpu.atmega328p },
        .os_tag = .freestanding,
        .abi = .none,
    };

    const target = uno;

    const exe = b.addExecutable(.{
        .name = "avr-arduino-zig",
        .root_source_file = .{ .path = "src/main.zig" },
        .target = target,
        .optimize = .ReleaseSafe, // workaround LLVM limitation
    });
    exe.setLinkerScriptPath(std.build.FileSource{ .path = "src/linker.ld" });

    b.installArtifact(exe);

    // I simply commented the rest out
}

it now fails with the following error:

zig build-exe avr-arduino-zig ReleaseSafe avr-freestanding-none: error: LLVM ERROR: Expected a constant shift amount!

zig build-exe avr-arduino-zig ReleaseSafe avr-freestanding-none: error: the following command terminated unexpectedly:
...
Build Summary: 0/3 steps succeeded; 1 failed (disable with --summary none)
install transitive failure
└─ install avr-arduino-zig transitive failure
   └─ zig build-exe avr-arduino-zig ReleaseSafe avr-freestanding-none failure
error: the following build command failed with exit code 1:
...

Do you have any idea what I can do to debug this further?

setLinkerScriptPath update for Zig 0.8.0

setLinkerScriptPath function in build.zig now requires FileSource struct:

exe.setLinkerScriptPath(std.build.FileSource{.path = "src/linker.ld"});

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