const std = @import("std");
const pico = @import("microzig").hal;
const pin_conf = pico.pins.GlobalConfiguration{
    .GPIO18 = .{ .name = "data", .direction = .out },
    .GPIO20 = .{ .name = "latch", .direction = .out },
    .GPIO21 = .{ .name = "clock", .direction = .out },
};
const pins = pin_conf.pins();
pub fn main() void {
    pin_conf.apply();
    var x: u8 = undefined;
    while (true) {
        // Q7 -> Q0
        x = 0b00000001;
        for (0..8) |_| {
            pins.latch.put(0);
            shiftOut(pins.data, pins.clock, .lsbFirst, x);
            pins.latch.put(1);
            // move the led
            x <<= 1;
            pico.time.sleep_ms(100);
        }
        // Q0 -> Q7
        x = 0b00000001;
        for (0..8) |_| {
            pins.latch.put(0);
            shiftOut(pins.data, pins.clock, .msbFirst, x);
            pins.latch.put(1);
            // move the led
            x <<= 1;
            pico.time.sleep_ms(100);
        }
    }
}
const BitOrder = enum {
    lsbFirst,
    msbFirst,
};
fn shiftOut(dataPin: pico.gpio.Pin, clockPin: pico.gpio.Pin, bitorder: BitOrder, val: u8) void {
    for (0..8) |i| {
        switch (bitorder) {
            .lsbFirst => dataPin.put(@as(u1, @truncate(val >> @as(u3, @intCast(i))))),
            .msbFirst => dataPin.put(@as(u1, @truncate(val >> @as(u3, @intCast(7 - i))))),
        }
        // mark data to be ready
        clockPin.put(1);
        clockPin.put(0);
    }
}

    const pr141 = mb.add_firmware(.{
        .name = "pr141",
        .target = mb.ports.rp2xxx.boards.raspberrypi.pico,
        .optimize = .ReleaseSmall,
        .root_source_file = b.path("src/141-595_led_bar.zig"),
    });
    mb.install_firmware(pr141, .{});