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+#ifndef ucoo_hal_i2c_i2c_soft_hh
+#define ucoo_hal_i2c_i2c_soft_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/i2c.hh"
+#include "ucoo/intf/io.hh"
+
+namespace ucoo {
+
+/// I2C interface, using IO.
+class I2cSoft : public I2cMaster
+{
+ public:
+ /// Constructor.
+ I2cSoft (Io &scl, Io &sda);
+ /// Destructor.
+ ~I2cSoft ();
+ /// Enable and setup.
+ void enable (int speed = 100000);
+ /// Disable.
+ void disable ();
+ /// See I2cMaster::send.
+ void send (uint8_t addr, const char *buf, int count);
+ /// See I2cMaster::recv.
+ void recv (uint8_t addr, char *buf, int count);
+ /// See I2cMaster::status.
+ int status ();
+ /// See I2cMaster::wait.
+ int wait ();
+ private:
+ /// Wait half a bit period.
+ void delay ();
+ /// Wait until SCL goes high (clock stretching).
+ void wait_scl ();
+ /// Send start condition.
+ void send_start ();
+ /// Send stop condition.
+ void send_stop ();
+ /// Send one bit.
+ void send_bit (bool bit);
+ /// Receive one bit.
+ bool recv_bit ();
+ /// Send one byte, return nack bit.
+ bool send_byte (char b);
+ /// Receive one byte.
+ char recv_byte (bool nack);
+ private:
+ /// I2C signals.
+ Io &scl_, &sda_;
+ /// Half period.
+ int half_period_ns_;
+ /// Current status.
+ int current_status_;
+};
+
+} // namespace ucoo
+
+#endif // ucoo_hal_i2c_i2c_soft_hh