From a4a3eca41d50e437807113782385b8df7abb2d37 Mon Sep 17 00:00:00 2001
From: Jim Paris <jim@jtan.com>
Date: Fri, 27 Jun 2014 22:52:27 -0400
Subject: [PATCH] Add sniffer support to ADuCRF101

This works with the examples/cc2538dk/sniffer/ project and the
corresponding "sensniff" host-side tool.
---
 cpu/arm/aducrf101/dev/radio.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/cpu/arm/aducrf101/dev/radio.c b/cpu/arm/aducrf101/dev/radio.c
index 24586b727..71f78f41b 100644
--- a/cpu/arm/aducrf101/dev/radio.c
+++ b/cpu/arm/aducrf101/dev/radio.c
@@ -58,6 +58,19 @@ static int current_channel = 915000000;
 static int current_power = 31;
 static int radio_is_on = 0;
 
+/*---------------------------------------------------------------------------*/
+/* Sniffer configuration.  We can re-use the CC2538 sniffer application
+   if we also accept CC2538_RF_CONF_SNIFFER. */
+#ifndef ADUCRF101_RF_CONF_SNIFFER
+#if CC2538_RF_CONF_SNIFFER
+#define ADUCRF101_RF_CONF_SNIFFER 1
+#endif
+#endif
+
+#if ADUCRF101_RF_CONF_SNIFFER
+#include "dev/uart.h"
+static const uint8_t magic[] = { 0x53, 0x6E, 0x69, 0x66 }; /* Snif */
+#endif
 /*---------------------------------------------------------------------------*/
 /* "Channel" is really frequency, and can be within the bands:
    431000000 Hz to 464000000 Hz
@@ -209,13 +222,14 @@ static int
 read(void *buf, unsigned short buf_len)
 {
   uint8_t packet_len;
+  int8_t rssi;
 
   if(buf_len > MAX_PACKET_LEN) {
     buf_len = MAX_PACKET_LEN;
   }
 
   /* Read already-received packet */
-  if(RadioRxPacketRead(buf_len, &packet_len, buf, NULL) != RIE_Success) {
+  if(RadioRxPacketRead(buf_len, &packet_len, buf, &rssi) != RIE_Success) {
     return 0;
   }
 
@@ -226,6 +240,20 @@ read(void *buf, unsigned short buf_len)
   /* Re-enter receive mode immediately after receiving a packet */
   RadioRxPacketVariableLen();
 
+#if ADUCRF101_RF_CONF_SNIFFER
+  uart_put(magic[0]);
+  uart_put(magic[1]);
+  uart_put(magic[2]);
+  uart_put(magic[3]);
+  uart_put(packet_len + 2);
+  for(int i = 0; i < packet_len; i++) {
+    uart_put(((uint8_t *)buf)[i]);
+  }
+  /* FCS value is Wireshark's "TI CC24xx format" option: */
+  uart_put(rssi); /* RSSI */
+  uart_put(0x80); /* CRC is OK, LQI correlation is 0 */
+#endif
+
   return packet_len;
 }
 /*---------------------------------------------------------------------------*/