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diff --git a/ucoo/hal/exti/test/test_exti.stm32.cc b/ucoo/hal/exti/test/test_exti.stm32.cc
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+// ucoolib - Microcontroller object oriented library. {{{
+//
+// Copyright (C) 2015 Nicolas Schodet
+//
+// 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 "ucoo/arch/arch.hh"
+#include "ucoo/hal/gpio/gpio.hh"
+#include "ucoo/hal/exti/exti.hh"
+#include "ucoo/utils/delay.hh"
+
+#include <libopencm3/stm32/rcc.h>
+
+ucoo::Gpio *led4p;
+
+void
+led4_handler ()
+{
+ led4p->toggle ();
+}
+
+int
+main (int argc, const char **argv)
+{
+ ucoo::arch_init (argc, argv);
+ rcc_periph_clock_enable (RCC_GPIOB);
+ rcc_periph_clock_enable (RCC_GPIOD);
+ // For this test, shorten B6 & B7 to have loopback.
+ ucoo::Gpio loop_out (GPIOB, 6);
+ ucoo::Gpio loop_in (GPIOB, 7);
+ ucoo::Gpio led3 (GPIOD, 13);
+ ucoo::Gpio led4 (GPIOD, 12);
+ led4p = &led4;
+ ucoo::ExtiHard exti (7);
+ exti.set_source (GPIOB);
+ exti.set_trigger (ucoo::ExtiHard::Edge::RISING);
+ exti.register_event (led4_handler);
+ exti.enable ();
+ loop_out.output ();
+ led3.output ();
+ led4.output ();
+ while (1)
+ {
+ loop_out.toggle ();
+ led3.set (loop_in.get ());
+ ucoo::delay (1);
+ }
+ return 0;
+}