rp2xxx: Build usb examples on rp2350 feather (#909)

Author: Grazfather

examples/raspberrypi/rp2xxx/build.zig

@@ -48,6 +48,8 @@ pub fn build(b: *std.Build) void {
         // Adafruit boards
         .{ .target = mb.ports.rp2xxx.boards.adafruit.feather_rp2350, .name = "adafruit_feather_rp2350_blinky", .file = "src/board_blinky.zig" },
         .{ .target = mb.ports.rp2xxx.boards.adafruit.feather_rp2350, .name = "adafruit_feather_rp2350_multicore", .file = "src/blinky_core1.zig" },
+        .{ .target = mb.ports.rp2xxx.boards.adafruit.feather_rp2350, .name = "adafruit_feather_rp2350_usb-cdc", .file = "src/usb_cdc.zig" },
+        .{ .target = mb.ports.rp2xxx.boards.adafruit.feather_rp2350, .name = "adafruit_feather_rp2350_usb-hid", .file = "src/usb_hid.zig" },
         .{ .target = mb.ports.rp2xxx.boards.adafruit.metro_rp2350, .name = "adafruit_metro_rp2350_blinky", .file = "src/board_blinky.zig" },
 
         // WaveShare Boards:

examples/raspberrypi/rp2xxx/src/usb_cdc.zig

@@ -3,7 +3,6 @@ const microzig = @import("microzig");
 
 const rp2xxx = microzig.hal;
 const time = rp2xxx.time;
-const gpio = rp2xxx.gpio;
 const usb = microzig.core.usb;
 // Port-specific type which implements the DeviceInterface interface, used by the USB core to
 // read from/write to the peripheral.
@@ -79,7 +78,7 @@ pub fn main() !void {
         // Ensure that the host as finished enumerating our USB device
         if (usb_controller.drivers()) |drivers| {
             new = time.get_time_since_boot().to_us();
-            if (new - old > 500000) {
+            if (new - old > 500_000) {
                 old = new;
                 pins.led.toggle();
                 i += 1;

examples/raspberrypi/rp2xxx/src/usb_hid.zig

@@ -3,7 +3,6 @@ const microzig = @import("microzig");
 
 const rp2xxx = microzig.hal;
 const time = rp2xxx.time;
-const gpio = rp2xxx.gpio;
 const usb = microzig.core.usb;
 const USB_Device = rp2xxx.usb.Polled(.{});
 
@@ -171,17 +170,16 @@ pub fn main() !void {
 
         if (usb_controller.drivers()) |drivers| {
             new = time.get_time_since_boot().to_us();
-            const time_since_last = new - old;
-            if (time_since_last < 2_000_000) {
+            if (new - old > 2_000_000) {
+                old = new;
+                idx = 0;
+            } else {
                 idx += @intFromBool(if (idx & 1 == 0 and idx < 2 * message.len)
                     drivers.keyboard.send_report(
                         &.{ .modifiers = .none, .keys = .{message[@intCast(idx / 2)]} ++ .{.reserved} ** 5 },
                     )
                 else
                     drivers.keyboard.send_report(&.empty));
-            } else {
-                old = new;
-                idx = 0;
             }
 
             if (drivers.keyboard.receive_report()) |report|

port/raspberrypi/rp2xxx/build.zig

@@ -171,7 +171,7 @@ pub fn init(dep: *std.Build.Dependency) Self {
             .adafruit = .{
                 .feather_rp2350 = chip_rp2350_arm.derive(.{
                     .board = .{
-                        .name = "Adafruit Faether RP2350",
+                        .name = "Adafruit Feather RP2350",
                         .url = "https://www.adafruit.com/product/6000",
                         .root_source_file = b.path("src/boards/adafruit_feather_rp2350.zig"),
                     },