Decouple hardware specific code from generic, agnostic code

src/board.h

@@ -0,0 +1,33 @@
+/*
+                        AVCLAN-Mockingboard
+    Copyright (C) 2015 Allen Hill <allenofthehills@gmail.com>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+// Board / MCU bring-up interface (the BSP seam). Implemented per-target (the AVR
+// implementation is target/avr-attiny3216/board_avr.c). Keeps the app
+// (sniffer.c) free of clock/pin/interrupt register access.
+
+#ifndef BOARD_H
+#define BOARD_H
+
+// Clock setup + GPIO/pin configuration. Call once, first thing at startup
+// (before any peripheral init).
+void board_init(void);
+
+// Globally enable interrupts. Call after all peripherals are initialized.
+void board_interruptsEnable(void);
+
+#endif // BOARD_H