Add doc and src folders

guowenxue

2018-02-04 785deec23b4cb1e7c4c4d81eb808f195adb1d98a

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#include "dev/nullradio.h"
 
 
/*---------------------------------------------------------------------------*/
static int
init(void)
{
  return 0;
}
/*---------------------------------------------------------------------------*/
static int
prepare(const void *payload, unsigned short payload_len)
{
  return 1;
}
/*---------------------------------------------------------------------------*/
static int
transmit(unsigned short transmit_len)
{
  return RADIO_TX_OK;
}
/*---------------------------------------------------------------------------*/
static int
send(const void *payload, unsigned short payload_len)
{
  prepare(payload, payload_len);
  return transmit(payload_len);
}
/*---------------------------------------------------------------------------*/
static int
read(void *buf, unsigned short buf_len)
{
  return 0;
}
/*---------------------------------------------------------------------------*/
static int
channel_clear(void)
{
  return 1;
}
/*---------------------------------------------------------------------------*/
static int
receiving_packet(void)
{
  return 0;
}
/*---------------------------------------------------------------------------*/
static int
pending_packet(void)
{
  return 0;
}
/*---------------------------------------------------------------------------*/
static int
on(void)
{
  return 0;
}
/*---------------------------------------------------------------------------*/
static int
off(void)
{
  return 0;
}
/*---------------------------------------------------------------------------*/
const struct radio_driver nullradio_driver =
  {
    init,
    prepare,
    transmit,
    send,
    read,
    channel_clear,
    receiving_packet,
    pending_packet,
    on,
    off,
  };
/*---------------------------------------------------------------------------*/