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diff --git a/ucoo/hal/gpio/gpio.stm32f1.hh b/ucoo/hal/gpio/gpio.stm32f1.hh
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+#ifndef ucoo_hal_gpio_gpio_stm32f1_hh
+#define ucoo_hal_gpio_gpio_stm32f1_hh
+// 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/intf/io.hh"
+
+#include <libopencm3/stm32/gpio.h>
+
+namespace ucoo {
+
+/// General purpose input/output on STM32F1.
+class Gpio : public Io
+{
+ public:
+ enum class InputCnf : uint8_t
+ {
+ ANALOG = GPIO_CNF_INPUT_ANALOG << 2,
+ FLOAT = GPIO_CNF_INPUT_FLOAT << 2,
+ // Up/Down is selected using output register.
+ PULL_UPDOWN = GPIO_CNF_INPUT_PULL_UPDOWN << 2,
+ };
+ enum class OutputCnf : uint8_t
+ {
+ PUSHPULL = GPIO_CNF_OUTPUT_PUSHPULL << 2,
+ OPENDRAIN = GPIO_CNF_OUTPUT_OPENDRAIN << 2,
+ ALTFN_PUSH_PULL = GPIO_CNF_OUTPUT_ALTFN_PUSHPULL << 2,
+ ALTFN_OPENDRAIN = GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN << 2,
+ };
+ enum class Speed : uint8_t
+ {
+ SPEED_2MHZ = GPIO_MODE_OUTPUT_2_MHZ,
+ SPEED_10MHZ = GPIO_MODE_OUTPUT_10_MHZ,
+ SPEED_50MHZ = GPIO_MODE_OUTPUT_50_MHZ,
+ };
+ public:
+ /// Constructor, take the PORT base address, and pin BIT number.
+ Gpio (uint32_t port, int bit);
+ /// See Io::set.
+ void set ();
+ /// See Io::reset.
+ void reset ();
+ /// See Io::set.
+ void set (bool state);
+ /// See Io::toggle.
+ void toggle ();
+ /// See Io::get.
+ bool get () const;
+ /// See Io::input.
+ void input ();
+ /// See Io::output.
+ void output ();
+ /// Set input configuration, used when port is input.
+ void input_cnf (InputCnf cnf);
+ /// Set output configuration, used when port is output.
+ void output_cnf (OutputCnf cnf);
+ /// Set output speed.
+ void speed (Speed s);
+ private:
+ /// Port register base address.
+ const uint32_t port_;
+ /// IO bitmask.
+ const uint16_t mask_;
+ /// Configuration for input.
+ InputCnf input_cnf_;
+ /// Configuration for output.
+ OutputCnf output_cnf_;
+ /// Speed for output.
+ Speed speed_;
+ /// Current intput/output state.
+ bool output_;
+};
+
+inline
+Gpio::Gpio (uint32_t port, int bit)
+ : port_ (port), mask_ (1u << bit),
+ input_cnf_ (InputCnf::FLOAT),
+ output_cnf_ (OutputCnf::PUSHPULL),
+ speed_ (Speed::SPEED_10MHZ),
+ output_ (false)
+{
+}
+
+} // namespace ucoo
+
+#endif // ucoo_hal_gpio_gpio_stm32f1_hh