stm32: desig: refactor to allow targets to have different addresses

In this commit, support for the different base addresses for different
F7 parts is added, but the mechanism is now in place for L1 and others.

Reviewed-by: Karl Palsson <karlp@tweak.net.au>
(whitespace fixed, commit msg reworded)

lib/stm32/common/desig_common_v1.c

@@ -0,0 +1,32 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2012 Karl Palsson <karlp@ŧweak.net.au>
+ *
+ * This library is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This library 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <libopencm3/stm32/desig.h>
+
+uint16_t desig_get_flash_size(void)
+{
+  return *((uint32_t*)DESIG_FLASH_SIZE_BASE);
+}
+
+void desig_get_unique_id(uint32_t *result)
+{
+  *result++ = DESIG_UNIQUE_ID2;
+  *result++ = DESIG_UNIQUE_ID1;
+  *result = DESIG_UNIQUE_ID0;
+}