Implement lcd dma

 * fix fp context
 * fix light sensor reading
 * fix svc handler debug return value hack that was not properly reverted

build.zig

@@ -4,16 +4,13 @@ const Build = std.Build;
 const MicroZig = @import("microzig/build");
 const atsam = @import("microzig/bsp/microchip/atsam");
 
-pub const py_badge: MicroZig.Target = .{
-    .preferred_format = .elf,
-    .chip = atsam.chips.atsamd51j19,
-    .hal = null,
-};
-
 fn sycl_badge_microzig_target(d: *Build.Dependency) MicroZig.Target {
+    var atsamd51j19_chip_with_fpu = atsam.chips.atsamd51j19.chip;
+    atsamd51j19_chip_with_fpu.cpu.target.cpu_features_add = std.Target.arm.featureSet(&.{.vfp4d16sp});
+    atsamd51j19_chip_with_fpu.cpu.target.abi = .eabihf;
     return .{
         .preferred_format = .elf,
-        .chip = atsam.chips.atsamd51j19.chip,
+        .chip = atsamd51j19_chip_with_fpu,
         .hal = .{
             .root_source_file = d.builder.path("src/hal.zig"),
         },

samples/feature_test.zig

@@ -66,11 +66,11 @@ export fn update() void {
 
     for (0..cart.screen_height) |y| {
         for (0..cart.screen_width) |x| {
-            cart.framebuffer[y * cart.screen_width + x] = .{
+            cart.framebuffer[x][y].setColor(.{
                 .r = @intFromFloat(@as(f32, @floatFromInt(x)) / cart.screen_width * 31),
                 .g = green_565,
                 .b = @intFromFloat(@as(f32, @floatFromInt(y)) / cart.screen_height * 31),
-            };
+            });
         }
     }
 

showcase/carts/metalgear-timer/src/metalgear-timer.zig

@@ -39,7 +39,7 @@ fn r(x: usize, y: usize, w: usize, h: usize) void {
         const y1 = y0 + sy * h;
         for (y0..y1) |yi| {
             for (x0..x1) |xi| {
-                cart.framebuffer[yi * cart.screen_width + xi] = color;
+                cart.framebuffer[xi][yi].setColor(color);
             }
         }
     }

showcase/carts/plasma/src/plasma.zig

@@ -24,7 +24,7 @@ const hue_colors = init_hue_colors: {
 
 var plasma_buffer = init_plasma_buffer: {
     @setEvalBranchQuota(100000);
-    var initial_plasma_buffer: [cart.framebuffer.len]u8 = undefined;
+    var initial_plasma_buffer: [cart.screen_width][cart.screen_height]u8 = undefined;
     var y: usize = 0;
     while (y < cart.screen_height) : (y += 1) {
         var x: usize = 0;
@@ -37,16 +37,18 @@ var plasma_buffer = init_plasma_buffer: {
             value += @sin(@sqrt(fx * fx + fy * fy) / 8.0);
             // shift range from -4 .. 4 to 0 .. 255
             value = std.math.clamp((value + 4) * 32, 0, 255);
-            initial_plasma_buffer[y * cart.screen_width + x] = @intFromFloat(value);
+            initial_plasma_buffer[x][y] = @intFromFloat(value);
         }
     }
     break :init_plasma_buffer initial_plasma_buffer;
 };
 
 fn updatePlasma() void {
-    for (0..cart.framebuffer.len) |i| {
-        plasma_buffer[i] +%= 2;
-        cart.framebuffer[i] = hue_colors[plasma_buffer[i]];
+    for (cart.framebuffer, &plasma_buffer) |*fb_col, *plasma_col| {
+        for (fb_col, plasma_col) |*fb_pix, *plasma_pix| {
+            plasma_pix.* +%= 2;
+            fb_pix.setColor(hue_colors[plasma_pix.*]);
+        }
     }
 }
 

showcase/carts/raytracer/src/camera.zig

@@ -40,8 +40,7 @@ w: Vec3,
 defocus_disk_u: Vec3,
 defocus_disk_v: Vec3,
 
-pub fn init(position: Vec3) Camera {
-    var self: Camera = undefined;
+pub fn init(self: *Camera, position: Vec3) void {
     self.lookfrom = position;
     self.camera_center = self.lookfrom;
 
@@ -68,8 +67,6 @@ pub fn init(position: Vec3) Camera {
 
     self.defocus_disk_u = self.u.mul_scalar(defocus_radius);
     self.defocus_disk_v = self.v.mul_scalar(defocus_radius);
-
-    return self;
 }
 
 fn pixel_sample_square(self: *Camera) Vec3 {
@@ -111,13 +108,12 @@ pub fn render(self: *Camera, world: *HittableList) !void {
             const samples: f32 = @floatFromInt(self.samples);
             col = col.div_scalar(samples);
 
-            const index: usize = i + j * image_width;
             const color = vec.color3_to_color(col);
-            cart.framebuffer[index] = .{
+            cart.framebuffer[i][j].setColor(.{
                 .r = @truncate(color.rgb.r >> 3),
                 .g = @truncate(color.rgb.g >> 2),
                 .b = @truncate(color.rgb.b >> 3),
-            };
+            });
         }
     }
     //std.debug.print("Done!\n", .{});

showcase/carts/raytracer/src/main.zig

@@ -41,7 +41,8 @@ pub fn main_program() !void {
     const x = radius * std.math.sin(angle_rad);
     const y = radius * std.math.cos(angle_rad);
 
-    var camera = Camera.init(Vec3.init(x, 2, y));
+    var camera: Camera = undefined;
+    camera.init(Vec3.init(x, 2, y));
 
     var a: i32 = -5;
     while (a < 5) : (a += 1) {

showcase/carts/zeroman/src/Renderer.zig

@@ -69,7 +69,7 @@ pub const Sprite = struct {
                 const index = (y + src_y0) * sprite.width + (if (flip_x) @abs(src_rect.w) - 1 - x else x) + src_x0;
                 const color = sprite.colors[sprite.indices.get(index)];
                 if (color.r == 31 and color.g == 0 and color.b == 31) continue;
-                cart.framebuffer[@as(usize, @intCast(dst_y * cart.screen_width + dst_x))] = color;
+                cart.framebuffer[@intCast(dst_x)][@intCast(dst_y)].setColor(color);
             }
         }
     }
@@ -95,7 +95,7 @@ pub const Tilemap = struct {
                 const src_y = (tile_index / 16) * tile_size + (y % tile_size);
                 const color = tiles.colors[tiles.indices.get(src_y * tiles.width + src_x)];
                 if (color.r == 31 and color.g == 0 and color.b == 31) continue;
-                cart.framebuffer[@as(usize, @intCast((dst_y) * cart.screen_width + dst_x))] = color;
+                cart.framebuffer[@intCast(dst_x)][@intCast(dst_y)].setColor(color);
             }
         }
     }
@@ -104,5 +104,11 @@ pub const Tilemap = struct {
 pub fn init() void {}
 
 pub fn clear() void {
-    @memset(cart.framebuffer, .{ .r = 0, .g = 0, .b = 0 });
+    cart.rect(.{
+        .x = 0,
+        .y = 0,
+        .width = cart.screen_width,
+        .height = cart.screen_height,
+        .fill_color = .{ .r = 0, .g = 0, .b = 0 },
+    });
 }

simulator/src/runtime.ts

@@ -129,6 +129,8 @@ export class Runtime {
             read_flash: this.read_flash.bind(this),
             write_flash_page: this.write_flash_page.bind(this),
 
+            rand: this.rand.bind(this),
+
             trace: this.trace.bind(this),
         };
 
@@ -207,6 +209,10 @@ export class Runtime {
         console.log(str);
     }
 
+    rand (): number {
+        return ~~(Math.random() * 4294967296.0);
+    }
+
     trace (strUtf8Ptr: number, byteLength: number) {
         const strUtf8 = new Uint8Array(this.memory.buffer, strUtf8Ptr, byteLength);
         const str = new TextDecoder().decode(strUtf8);