stm32g0: add exti.

Regular exti, with enhanced EXTI_[FR]PR regs instead of EXTIR_PR.

include/libopencm3/stm32/exti.h

@@ -40,6 +40,8 @@
 #       include <libopencm3/stm32/l1/exti.h>
 #elif defined(STM32L4)
 #       include <libopencm3/stm32/l4/exti.h>
+#elif defined(STM32G0)
+#       include <libopencm3/stm32/g0/exti.h>
 #else
 #       error "stm32 family not defined."
 #endif

include/libopencm3/stm32/g0/exti.h

@@ -0,0 +1,83 @@
+/** @defgroup exti_defines EXTI Defines
+ *
+ * @ingroup STM32G0xx_defines
+ *
+ * @brief <b>Defined Constants and Types for the STM32G0xx EXTI Control</b>
+ *
+ * @version 1.0.0
+ *
+ * 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_EXTI_H
+#define LIBOPENCM3_EXTI_H
+
+#include <libopencm3/stm32/common/exti_common_all.h>
+
+/* --- EXTI registers ------------------------------------------------------ */
+#define EXTI_RTSR1			MMIO32(EXTI_BASE + 0x00)
+#define EXTI_RTSR			EXTI_RTSR1
+
+#define EXTI_FTSR1			MMIO32(EXTI_BASE + 0x04)
+#define EXTI_FTSR			EXTI_FTSR1
+
+#define EXTI_SWIER1			MMIO32(EXTI_BASE + 0x08)
+#define EXTI_RPR1			MMIO32(EXTI_BASE + 0x0c)
+#define EXTI_FPR1			MMIO32(EXTI_BASE + 0x10)
+
+#define EXTI_EXTICR(i)		MMIO32(EXTI_BASE + 0x60 + (i)*4)
+#define EXTI_EXTICR1		MMIO32(EXTI_BASE + 0x60)
+#define EXTI_EXTICR2		MMIO32(EXTI_BASE + 0x64)
+#define EXTI_EXTICR3		MMIO32(EXTI_BASE + 0x68)
+#define EXTI_EXTICR4		MMIO32(EXTI_BASE + 0x6c)
+
+#define EXTI_IMR1			MMIO32(EXTI_BASE + 0x80)
+#define EXTI_IMR			EXTI_IMR1
+
+#define EXTI_EMR1			MMIO32(EXTI_BASE + 0x84)
+#define EXTI_EMR			EXTI_EMR1
+
+#define EXTI_IMR2			MMIO32(EXTI_BASE + 0x90)
+#define EXTI_EMR2			MMIO32(EXTI_BASE + 0x94)
+
+/* --- EXTI_EXTICR Values -------------------------------------------------*/
+
+#define EXTI_EXTICR_FIELDSIZE		8
+#define EXTI_EXTICR_GPIOA		0
+#define EXTI_EXTICR_GPIOB		1
+#define EXTI_EXTICR_GPIOC		2
+#define EXTI_EXTICR_GPIOD		3
+#define EXTI_EXTICR_GPIOF		5
+
+BEGIN_DECLS
+
+uint32_t exti_get_rising_flag_status(uint32_t exti);
+uint32_t exti_get_falling_flag_status(uint32_t exti);
+
+void exti_reset_rising_request(uint32_t extis);
+void exti_reset_falling_request(uint32_t extis);
+
+END_DECLS
+/**@}*/
+
+#else
+#warning "exti_common_v1.h should not be included directly, only via exti.h"
+#endif
+/** @endcond */