Initial commit for programming an arduino in Zig.HEADmain

This is a simple collatz blinker program.

1 files changed, 27 insertions, 0 deletions

diff --git a/init.zig b/init.zig
new file mode 100644
index 0000000..be0bd10
--- /dev/null
+++ b/init.zig
@@ -0,0 +1,27 @@
+pub export fn _start() linksection(".vectors") callconv(.Naked) void {
+    asm volatile (
+        \\ rjmp reset    ; jump to reset
+        \\ rjmp ext_int0
+    );
+}
+
+pub export const end_of_ram: u16 = 0x8FF;
+pub export fn reset() linksection(".vectors") callconv(.Naked) void {
+    asm volatile (
+        \\ sei
+        \\ rjmp main
+    );
+    // asm volatile (
+    //     \\ ldi r16, hi8(%[ramend])
+    //     \\ sts 0x3E, r16
+    //     \\ ldi r16, lo8(%[ramend])
+    //     \\ sts 0X3D, r16
+    //     \\ sei
+    //     \\ jmp main
+    //     :
+    //     : [ramend] "i" (end_of_ram)
+    //     : "r16"
+    // );
+}
+
+pub export fn ext_int0() void {}