First commit

src/uart.rs

@@ -0,0 +1,9 @@
+const UART_BASE: *mut u8 = 0x10000000 as *mut _;
+pub fn write_char_uart(c: char) {
+    while unsafe { core::ptr::read_volatile(UART_BASE.byte_add(0x5)) } >> 5 & 1 == 0 {}
+    unsafe { core::ptr::write_volatile(UART_BASE, c as u8) };
+}
+
+pub fn write_uart<T: AsRef<str>>(print: T) {
+    print.as_ref().chars().for_each(write_char_uart);
+}