STM32F2: Add EXTI support.

Add series headers to keep the base pointers, and (on F2) use SYSCFG
to tell exti_do_select() where the EXTI control registers are. No
surprises.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

3 files changed, 80 insertions, 0 deletions

diff --git a/libmaple/stm32f2/exti.c b/libmaple/stm32f2/exti.c
new file mode 100644
index 0000000..208415f
--- /dev/null
+++ b/libmaple/stm32f2/exti.c
@@ -0,0 +1,33 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2012 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+*****************************************************************************/
+
+#include <libmaple/exti.h>
+#include <libmaple/syscfg.h>
+#include "exti_private.h"
+
+void exti_select(exti_num num, exti_cfg cfg) {
+    exti_do_select(&SYSCFG_BASE->EXTICR[num / 4], num, cfg);
+}
diff --git a/libmaple/stm32f2/include/series/exti.h b/libmaple/stm32f2/include/series/exti.h
new file mode 100644
index 0000000..4643fcf
--- /dev/null
+++ b/libmaple/stm32f2/include/series/exti.h
@@ -0,0 +1,46 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2012 LeafLabs, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+/**
+ * @file libmaple/stm32f1/include/series/exti.h
+ * @brief STM32F2 external interrupts
+ */
+
+#ifndef _LIBMAPLE_STM32F2_EXTI_H_
+#define _LIBMAPLE_STM32F2_EXTI_H_
+
+#ifdef __cpluspus
+extern "C" {
+#endif
+
+struct exti_reg_map;
+#define EXTI_BASE ((struct exti_reg_map*)0x40013C00)
+
+#ifdef __cpluspus
+}
+#endif
+
+#endif
diff --git a/libmaple/stm32f2/rules.mk b/libmaple/stm32f2/rules.mk
index a5be551..fd6b933 100644
--- a/libmaple/stm32f2/rules.mk
+++ b/libmaple/stm32f2/rules.mk
@@ -12,6 +12,7 @@ sSRCS_$(d) := isrs.S
 sSRCS_$(d) += vector_table.S
 
 cSRCS_$(d) := adc.c
+cSRCS_$(d) += exti.c
 cSRCS_$(d) += fsmc.c
 cSRCS_$(d) += gpio.c
 cSRCS_$(d) += rcc.c