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diff --git a/digital/ucoolib/ucoolib/hal/spi/spi_soft.hh b/digital/ucoolib/ucoolib/hal/spi/spi_soft.hh
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+#ifndef ucoolib_hal_spi_spi_soft_hh
+#define ucoolib_hal_spi_spi_soft_hh
+// ucoolib - Microcontroller object oriented library. {{{
+//
+// Copyright (C) 2013 Nicolas Schodet
+//
+// APBTeam:
+// Web: http://apbteam.org/
+// Email: team AT apbteam DOT org
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program 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 General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+//
+// }}}
+#include "ucoolib/intf/spi_master.hh"
+#include "ucoolib/intf/io.hh"
+
+namespace ucoo {
+
+/// Software implementation of a SPI master.
+class SpiSoftMaster : public SpiMaster
+{
+ public:
+ /// Constructor, need all SPI pins. Speed is given in Hz.
+ SpiSoftMaster (Io &sck, Io &mosi, Io &miso, int speed = 0,
+ SpiMode mode = SPI_MODE_0);
+ /// Destructor, release SPI pins.
+ ~SpiSoftMaster ();
+ /// Change settings, use speed 0 to stop.
+ void setup (int speed, SpiMode mode = SPI_MODE_0);
+ /// See SpiMaster::send_and_recv.
+ void send_and_recv (const char *tx_buf, char *rx_buf, int count);
+ /// Send and receive one byte.
+ char send_and_recv (char tx);
+ /// See SpiMaster::send.
+ void send (const char *tx_buf, int count);
+ /// Send one byte.
+ void send (char tx);
+ /// See SpiMaster::recv.
+ void recv (char *rx_buf, int count);
+ /// Receive one byte.
+ char recv ();
+ private:
+ Io &sck_, &mosi_, &miso_;
+ int half_period_ns_;
+ bool cpha_;
+};
+
+} // namespace ucoo
+
+#endif // ucoolib_hal_spi_spi_soft_hh