stm32: initial support

src/runtime/runtime_stm32.go

@@ -0,0 +1,34 @@
+// +build stm32
+
+package runtime
+
+import (
+	"device/arm"
+)
+
+type timeUnit int64
+
+const tickMicros = 1 // TODO
+
+//go:export Reset_Handler
+func handleReset() {
+	main()
+}
+
+func init() {
+}
+
+func putchar(c byte) {
+	// TODO
+}
+
+func sleepTicks(d timeUnit) {
+	// TODO: use a real timer here
+	for i := 0; i < int(d/535); i++ {
+		arm.Asm("")
+	}
+}
+
+func ticks() timeUnit {
+	return 0 // TODO
+}