stm32:l4: Add SPI

Same as F3, tested

include/libopencm3/stm32/l4/spi.h

@@ -0,0 +1,36 @@
+/** @defgroup spi_defines SPI Defines
+ *
+ * @brief <b>Defined Constants and Types for the STM32L4xx SPI</b>
+ *
+ * @ingroup STM32L4xx_defines
+ *
+ * @version 1.0.0
+ *
+ * @date 15 December 2017
+ *
+ * LGPL License Terms @ref lgpl_license
+ */
+
+/*
+ * 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_SPI_H
+#define LIBOPENCM3_SPI_H
+
+#include <libopencm3/stm32/common/spi_common_f03.h>
+
+#endif

include/libopencm3/stm32/spi.h

@@ -32,6 +32,8 @@
 #       include <libopencm3/stm32/f4/spi.h>
 #elif defined(STM32L1)
 #       include <libopencm3/stm32/l1/spi.h>
+#elif defined(STM32L4)
+#       include <libopencm3/stm32/l4/spi.h>
 #else
 #       error "stm32 family not defined."
 #endif

lib/stm32/l4/Makefile

@@ -53,6 +53,7 @@ OBJS            += usart_common_all.o usart_common_v2.o
 OBJS            += dma_common_l1f013.o
 OBJS            += iwdg_common_all.o
 OBJS            += rtc_common_l1f024.o
+OBJS            += spi_common_all.o spi_common_f03.o
 
 OBJS            += usb.o usb_control.o usb_standard.o
 OBJS            += st_usbfs_core.o st_usbfs_v2.o