stm32f7: enable existing ltdc

This uses the existing f4 code as a new shared common base code.

include/libopencm3/stm32/f7/ltdc.h

@@ -0,0 +1,31 @@
+/** @defgroup ltdc_defines LTDC Defines
+ * @brief <b>Defined Constants and Types for the STM32F7xx LCD TFT Display
+ *           Controller</b>
+ * @ingroup STM32F7xx_defines
+ */
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * 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/>.
+ */
+/**@{*/
+
+#ifndef LIBOPENCM3_STM32_F7_LTDC_H_
+#define LIBOPENCM3_STM32_F7_LTDC_H_
+
+#include <libopencm3/stm32/common/ltdc_common_f47.h>
+
+#endif /* LIBOPENCM3_STM32_F7_LTDC_H_ */
+
+/**@}*/

include/libopencm3/stm32/f7/memorymap.h

@@ -94,6 +94,7 @@
 #define SAI1_BASE			(PERIPH_BASE_APB2 + 0x5800)
 #define SAI2_BASE			(PERIPH_BASE_APB2 + 0x5C00)
 #define LCD_TFT_BASE			(PERIPH_BASE_APB2 + 0x6800)
+#define LTDC_BASE			(PERIPH_BASE_APB2 + 0x6800) /* compat. with f4 */
 /* PERIPH_BASE_APB2 + 0x6C00 (0x4001 6C00 - 0x4001 FFFF): Reserved */
 
 /* AHB1 */