can drawiter

user-apps/calculator/Cargo.toml

@@ -4,4 +4,4 @@ version = "0.1.0"
 edition = "2024"
 
 [dependencies]
-abi = { path ="../../abi" }
+abi = { path = "../../abi" }

user-apps/calculator/src/main.rs

@@ -1,7 +1,7 @@
 #![no_std]
 #![no_main]
 
-use abi::{Syscall, call_abi};
+use abi::{Pixel, Point, Rgb565, RgbColor, Syscall, call_abi};
 use core::panic::PanicInfo;
 
 #[panic_handler]
@@ -11,14 +11,23 @@ fn panic(_info: &PanicInfo) -> ! {
 
 #[unsafe(no_mangle)]
 pub extern "C" fn _start() {
-    for i in 0..300 {
-        for o in 0..300 {
-            let call = Syscall::DrawPixel {
-                x: i,
-                y: o,
-                color: 0,
-            };
-            unsafe { call_abi(&call) };
-        }
+    // Local pixel buffer
+    let mut pixels = [Pixel(Point { x: 50, y: 50 }, Rgb565::RED); 300];
+    for (i, p) in pixels.iter_mut().enumerate() {
+        *p = Pixel(
+            Point {
+                x: i as i32,
+                y: i as i32,
+            },
+            Rgb565::RED,
+        )
     }
+
+    // Construct syscall with raw pointer + length
+    let call = Syscall::DrawIter {
+        pixels: pixels.as_ptr(), // raw pointer
+        len: pixels.len(),       // number of elements
+    };
+
+    unsafe { call_abi(&call) };
 }