From: idgay <idgay>
Date: Sat, 20 Sep 2008 00:10:18 +0000 (+0000)
Subject: nx_float support
X-Git-Tag: rc_6_tinyos_2_1_1~614
X-Git-Url: https://oss.titaniummirror.com/gitweb/?a=commitdiff_plain;h=cdf278b6057cacffcbf1940bd8fed63cb23c9242;p=tinyos-2.x.git

nx_float support
---

diff --git a/tos/chips/atm128/atm128hardware.h b/tos/chips/atm128/atm128hardware.h
index 32c1c8e3..b412d90f 100644
--- a/tos/chips/atm128/atm128hardware.h
+++ b/tos/chips/atm128/atm128hardware.h
@@ -135,7 +135,12 @@ mcu_power_t mcombine(mcu_power_t m1, mcu_power_t m2) @safe() {
   return (m1 < m2)? m1: m2;
 }
 
-/* Floating-point network-type support */
+/* Floating-point network-type support.
+   These functions must convert to/from a 32-bit big-endian integer that follows
+   the layout of Java's java.lang.float.floatToRawIntBits method.
+   Conveniently, for the AVR family, this is a straight byte copy...
+*/
+
 typedef float nx_float __attribute__((nx_base_be(afloat)));
 
 inline float __nesc_ntoh_afloat(const void *COUNT(sizeof(float)) source) @safe() {
diff --git a/tos/chips/msp430/msp430hardware.h b/tos/chips/msp430/msp430hardware.h
index 829f2bd8..ac18b26c 100644
--- a/tos/chips/msp430/msp430hardware.h
+++ b/tos/chips/msp430/msp430hardware.h
@@ -239,7 +239,12 @@ void __nesc_atomic_end(__nesc_atomic_t reenable_interrupts) @spontaneous() @safe
 }
 #endif
 
-/* Floating-point network-type support */
+/* Floating-point network-type support.
+   These functions must convert to/from a 32-bit big-endian integer that follows
+   the layout of Java's java.lang.float.floatToRawIntBits method.
+   Conveniently, for the MSP430 family, this is a straight byte copy...
+*/
+
 typedef float nx_float __attribute__((nx_base_be(afloat)));
 
 inline float __nesc_ntoh_afloat(const void *COUNT(sizeof(float)) source) @safe() {