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//

// Copyright (c) 2004 Guy Hutchison (ghutchis@opencores.org)

//

// 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.

//

sfr at 0x18 uart_dm0;

sfr at 0x19 uart_dm1;

sfr at 0x1a uart_iir;

sfr at 0x1b uart_lcr;

sfr at 0x1c uart_mcr;

sfr at 0x1d uart_lsr;

sfr at 0x1e uart_msr;

sfr at 0x1f uart_scr;

sfr at 0x80 sim_ctl_port;

sfr at 0x81 msg_port;

sfr at 0x82 timeout_port;

// THR (transmit holding register) is DM0

// RBR (receive buffer register) is also DM0

void print (char *string)

{

  char *iter;

  iter = string;

  while (*iter != 0) {

    msg_port = *iter++;

  }

}

char rxbuf[128];

void test_byte (unsigned char pattern) {

  unsigned char status, data;

  // send a byte through the UART

  uart_dm0 = pattern;

  // wait for byte to be received

  do {

    status = uart_lsr;

  } while ((status & 0x01) == 0);

  // fail if status byte indicates anything other

  // than data ready and transmitter empty

  if (status != 0x61) {

    print ("Incorrect status byte\n");

    sim_ctl_port = 0x02;

  }

  // read the sent byte and fail if it's not what we sent

  data = uart_dm0;

  if (data != pattern) {

    print ("Data miscompare\n");

    sim_ctl_port = 0x02;

  }

}

int main ()

{

  //print ("Hello, world!\n");

  int i, rx_count;

  // set divisor to 100

  uart_lcr = 0x8b;

  uart_dm0 = 0x02;

  uart_dm1 = 0x00;

  // line settings:

  // 8 bits, 1 stop bit, even parity

  uart_lcr = 0x0b;

  // turn on internal loopback in UART

  uart_mcr = 0x10;

  test_byte (0x55);

  test_byte (0x1F);

  // turn off loopback and use external loop

  uart_mcr = 0x00;

  test_byte (0xAA);

  test_byte (0xBD);

  // maybe do a checksum here

  sim_ctl_port = 0x01;

  return 0;

}