From a61deb78f44309b995efca72c189112a905842c7 Mon Sep 17 00:00:00 2001
From: Mariano Alvira <mar@devl.org>
Date: Thu, 11 Mar 2010 15:18:29 -0500
Subject: [PATCH] add a way to disable FCS checking.

---
 lib/include/maca.h | 8 ++++++++
 lib/maca.c         | 3 +++
 2 files changed, 11 insertions(+)

diff --git a/lib/include/maca.h b/lib/include/maca.h
index 4abbdd788..1dcb72ef2 100644
--- a/lib/include/maca.h
+++ b/lib/include/maca.h
@@ -17,6 +17,10 @@
 #define RTSO            15                   /* reset slot counter             */
 #define ROLE            13                   /* set if PAN coordinator         */
 #define NOFC            12                   /* set to disable FCS             */
+enum {
+	USE_FCS = 0,
+	NO_FCS  = 1,
+};
 #define PRM             11                   /* set for promiscuous mode       */          
 #define REL             10                   /* 1 for relative, 0 for absolute */
 #define ASAP            9                    /* 1 start now, 0 timer start     */
@@ -124,6 +128,10 @@ volatile packet_t* get_free_packet(void);
 void free_packet(volatile packet_t *p);
 void free_all_packets(void);
 
+/* set_fcs_mode(NO_FCS) to disable checksum filtering */
+extern volatile uint8_t fcs_mode;
+#define set_fcs_mode(x) fcs_mode = (x)
+
 extern void maca_rx_callback(volatile packet_t *p) __attribute__((weak));
 
 /******************************************************************************/
diff --git a/lib/maca.c b/lib/maca.c
index 0305ef828..094724e9b 100644
--- a/lib/maca.c
+++ b/lib/maca.c
@@ -46,6 +46,8 @@ static volatile uint8_t last_post = NO_POST;
 #define safe_irq_disable(x)  volatile uint32_t saved_irq; saved_irq = *INTENABLE; disable_irq(x)
 #define irq_restore() *INTENABLE = saved_irq
 
+volatile uint8_t fcs_mode = USE_FCS; 
+
 void maca_init(void) {
 	reset_maca();
 	radio_init();
@@ -157,6 +159,7 @@ void post_receive(void) {
 	enable_irq(MACA);
 	*MACA_CONTROL = ( (1 << maca_ctrl_asap) | 
 			  ( 4 << PRECOUNT) |
+			  ( fcs_mode << NOFC ) |
 			  (1 << maca_ctrl_auto) |
 			  (1 << maca_ctrl_prm) |
 			  (maca_ctrl_seq_rx));