hpluartm.nc

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/*									tab:4
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 * Copyright (c) 2002-2003 Intel Corporation
 * All rights reserved.
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/* Authors:		Fred Jiang
 * Revision:		$Id: HPLUARTM.nc,v 1.8 2004/02/20 08:35:29 kaminw Exp $
 *
 */

module HPLUARTM {
  provides interface HPLUART as UART;

}
implementation
{
  async command result_t UART.init() {

    atomic { 
      outp(0, UBRRH);
      outp(12, UBRRL); //set the baud rate generator register (4800 baud) or 9600 baud
      //if U2X 
      inp(UDR); //read the uart data received register to invalidate frame error and parity error flags
      
      // Set UART single  speed if 0 and double speed if 1
      outp((1<<U2X),UCSRA);
      
      // Set frame format: 8 data-bits, 1 stop-bit
      outp(((3 << UCSZ0) | (1 << URSEL)) , UCSRC);
      
      // Enable reciever and transmitter and their interrupts
      outp(((1 << RXCIE) | (1 << TXCIE) | (1 << RXEN) | (1 << TXEN)) ,UCSRB);
      
    }
    
    TOSH_SET_UART_RXD_PIN();//use pull-up resister on transmit line to make it hight when idle
    return SUCCESS;
  }
  
  async command result_t UART.stop() {
    outp(0x00, UCSRA);
    outp(0x00, UCSRB);
    outp(0x00, UCSRC);
  }
  
  default async event result_t UART.get(uint8_t data) { return SUCCESS; }
  TOSH_SIGNAL(SIG_UART_RECV) {
    if (inp(UCSRA) & 0x80)
      signal UART.get(inp(UDR));
  }
  
  default async event result_t UART.putDone() { return SUCCESS; }
  TOSH_INTERRUPT(SIG_UART_TRANS) {
    signal UART.putDone();
  }
  
  async command result_t UART.put(uint8_t data) {
    outp(data, UDR); 
    sbi(UCSRA, TXC);
    return SUCCESS;
  }
}