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// ----------------------------------------------------------------------------
 
// SystemC Uart: definition
 
// This file is part of the cycle accurate model of the OpenRISC 1000 based
// system-on-chip, ORPSoC, built using Verilator.
 
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 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 Lesser General Public
// License for more details.
 
// You should have received a copy of the GNU Lesser General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
// ----------------------------------------------------------------------------
 
// $Id: $
 
#ifndef UART_SC__H
#define UART_SC__H
 
#include "systemc.h"
#include <stdint.h>
 
//! Handle UART I/O
 
class UartSC:public sc_core::sc_module {
public:
 
	// Constructor
	UartSC(sc_core::sc_module_name name);
 
	// The ports
	sc_in < bool > clk;
	sc_in < bool > uarttx;
	sc_out < bool > uartrx;
 
	// Init function
	void initUart(int uart_baud);
	// Transmit (from ORPSoC) handling function
	void checkTx();
	// Receieve (in ORPSoC) generation function
	void driveRx();
	// Check keyboard for entry
	int kbhit();
	// Enable canonical mode on console
	void nonblock(int state);
 
private:
	uint8_t current_char;
	int counter;
	int bits_received;
	int ns_per_bit;
 
	int rx_state;
	int rx_counter;
	int rx_bits_sent;
	char rx_char;
 
};				// UartSC ()
 
#endif // UART_SC__H