A null radio driver that does not do anything - useful in the native port and as a template for new radio drivers

Makefile.include

@@ -53,7 +53,7 @@ SYSTEM  = process.c procinit.c autostart.c elfloader.c profile.c \
 THREADS = mt.c
 LIBS    = memb.c mmem.c timer.c list.c etimer.c energest.c rtimer.c stimer.c \
           print-stats.c ifft.c crc16.c random.c checkpoint.c ringbuf.c
-
+DEV     = nullradio.c
 NET     = netstack.c
 
 ifdef UIP_CONF_IPV6
@@ -72,9 +72,9 @@ CTK     = ctk.c
 CTKVNC  = $(CTK) ctk-vncserver.c libconio.c vnc-server.c vnc-out.c ctk-vncfont.c
 
 ifndef CONTIKI_NO_NET
-  CONTIKIFILES = $(SYSTEM) $(LIBS) $(NET) $(THREADS) $(DHCP)
+  CONTIKIFILES = $(SYSTEM) $(LIBS) $(NET) $(THREADS) $(DHCP) $(DEV)
 else
-  CONTIKIFILES = $(SYSTEM) $(LIBS) $(THREADS) sicslowpan.c fakeuip.c
+  CONTIKIFILES = $(SYSTEM) $(LIBS) $(THREADS) $(DEV) sicslowpan.c fakeuip.c
 endif
 
 CONTIKI_SOURCEFILES += $(CONTIKIFILES)

core/dev/nullradio.c

@@ -0,0 +1,79 @@
+#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,
+  };
+/*---------------------------------------------------------------------------*/

core/dev/nullradio.h

@@ -0,0 +1,8 @@
+#ifndef NULLRADIO_H
+#define NULLRADIO_H
+
+#include "dev/radio.h"
+
+extern const struct radio_driver nullradio_driver;
+
+#endif /* NULLRADIO_H */