text: /*******************************************************************************
   * Copyright (C) 2017, 2018 MINRES Technologies GmbH
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   *
   * 3. Neither the name of the copyright holder nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
   * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   *******************************************************************************/
  
  #ifndef _UART_H_
  #define _UART_H_
  
  #include "cci_configuration"
  #include "tlm/scc/signal_initiator_mixin.h"
  #include "tlm/scc/signal_target_mixin.h"
  #include "scc/tlm_target.h"
  #include <tlm/scc/tlm_signal.h>
  
  namespace sysc {
  class tlm_signal_uart_extension;
  class uart_regs;
  class WsHandler;
  
  class uart : public sc_core::sc_module, public scc::tlm_target<> {
  public:
      SC_HAS_PROCESS(uart);// NOLINT
      sc_core::sc_in<sc_core::sc_time> clk_i;
      sc_core::sc_in<bool> rst_i;
      tlm::scc::tlm_signal_bool_out tx_o;
      tlm::scc::tlm_signal_bool_in rx_i;
  
      sc_core::sc_out<bool> irq_o;
  
      cci::cci_param<bool> bit_true_transfer;
  
      uart(sc_core::sc_module_name nm);
      virtual ~uart() override;
  
  protected:
      void clock_cb();
      void reset_cb();
      void transmit_data();
      void receive_data(tlm::scc::tlm_signal_gp<> &gp, sc_core::sc_time &delay);
      void update_irq();
      sc_core::sc_time clk{sc_core::SC_ZERO_TIME}, rx_last_start{sc_core::SC_ZERO_TIME};
      std::unique_ptr<uart_regs> regs;
      sc_core::sc_fifo<uint8_t> rx_fifo, tx_fifo;
  };
  
  } /* namespace sysc */
  
  #endif /* _UART_H_ */
  