uart improvements and improved definition of how many clock units there are (#16)

src/hal/clocks.zig

@@ -82,7 +82,7 @@ pub const Generator = enum(u32) {
     }
 
     const generators = @intToPtr(
-        *volatile [10]GeneratorRegs,
+        *volatile [@typeInfo(Generator).Enum.fields.len]GeneratorRegs,
         regs.CLOCKS.base_address,
     );
 

src/hal/uart.zig

@@ -226,6 +226,7 @@ var uart_logger: ?UART.Writer = null;
 
 pub fn initLogger(uart: UART) void {
     uart_logger = uart.writer();
+    uart_logger.?.writeAll("\r\n================ STARTING NEW LOGGER ================\r\n") catch {};
 }
 
 pub fn log(
@@ -248,3 +249,16 @@ pub fn log(
         uart.print(prefix ++ format ++ "\r\n", .{ seconds, microseconds } ++ args) catch {};
     }
 }
+
+pub fn panic(
+    message: []const u8,
+    _: ?*std.builtin.StackTrace,
+    _: ?usize,
+) noreturn {
+    if (uart_logger) |writer| {
+        writer.print("PANIC: {s}\r\n", .{message}) catch {};
+    }
+
+    @breakpoint();
+    while (true) {}
+}