hardware.c

用于传感器网络的节点操作系统 TinyOS 结构设计非常有意思

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/*
 *
 * Authors:             Philip Levis
 * Description:         Implementation of NIDO hardware emulation.
 * Date:                September 24, 2001
 *
 */

#include "dbg.h"
//#include "RADIO.h"

struct {
  char status_register;  // SREG
  char register_A;
  char register_B;
  char register_C;
  char register_D;
  char register_E;
  char register_default;
} TOSH_pc_hardware;

void init_hardware() {
  int i;
  for (i = 0; i < tos_state.num_nodes; i++) {
    tos_state.current_node = i;
    TOSH_pc_hardware.status_register = 0xff;
  }
}

short set_io_bit(char port, char bit) {
  char* register_ptr;
  switch(port) {
  case PORTA:
    register_ptr = &TOSH_pc_hardware.register_A;
    break;

  case PORTB:
    register_ptr = &TOSH_pc_hardware.register_B;
    break;

  case PORTC:
    register_ptr = &TOSH_pc_hardware.register_C;
    break;
    
  case PORTD:
    register_ptr = &TOSH_pc_hardware.register_D;
    break;
    
  case PORTE:
    register_ptr = &TOSH_pc_hardware.register_E;
    break;
    
  case SREG:
    register_ptr = &TOSH_pc_hardware.status_register;
    break;

  default:
    register_ptr = &TOSH_pc_hardware.register_default;
    break;
  }
  
  dbg(DBG_HARD, "Set bit %i of port %c\n", (int)bit, port);

  *register_ptr = (*register_ptr |= (0x1 << bit));

  return *register_ptr;
}

short clear_io_bit(char port, char bit) {
  dbg(DBG_HARD, "Clear bit %i of port %c\n", (int)bit, port);
  return 0xff;
}

char inp_emulate(char port) {
  switch(port) {
  case SREG:
    //dbg(DBG_HARD, "inp(SREG)\n");
    return TOSH_pc_hardware.status_register;

  default:
    dbg(DBG_HARD, "inp(%c)\n", port);
    return 0xff;
  }
}

#ifdef RADIO_GET_BIT_RATE
char TOS_COMMAND(RADIO_GET_BIT_RATE)();
#endif

short inw_emulate(char port) {
  switch(port) {
    //case TCNT1L:
    //#ifdef RADIO_GET_BIT_RATE
    //return TOS_CALL_COMMAND(RADIO_GET_BIT_RATE)();
    //#endif
  default:
    dbg(DBG_HARD, "inw(%c)\n", port);
    return 0xffff;
  }
}

char outp_emulate(char val, char port) {
  dbg(DBG_HARD, "outp(0x%x, %c)\n", val, port);
  return 0xff;
}

short cli(void) {
  TOSH_pc_hardware.status_register &= 0x7f;
  return 0xff;
}

short sei(void) {
  TOSH_pc_hardware.status_register |= 0x80;
  return 0xff;
}