make the software ack timeout configurable

[tinyos-2.x.git] / tos / chips / rf2xx / README

diff --git a/tos/chips/rf2xx/README b/tos/chips/rf2xx/README
index a0a2de989ebf828fc69f3968bb91797c6443e547..35b670702028922a89bfb0a4619e9fce379749fc 100644 (file)
--- a/tos/chips/rf2xx/README
+++ b/tos/chips/rf2xx/README
@@ -66,3 +66,11 @@ RADIO_ALARM_MILLI_EXP:
 The base two logarithm of the number of radio alarm ticks per one 
 millisecond.
 
+SOFTWAREACK_TIMEOUT:
+
+The number of microseconds the driver should wait for a software 
+acknowledgement on the sender side. If your SPI bus is slow, then it will 
+take more time to download and upload the message from/to the radio chip, 
+so you need to increase this wait period. For example, for IRIS->IRIS 
+communication 800 microsec is enough, but for IRIS->TELOS we need 1600 
+because the TELOS in software ack mode is slow to reply with an ack packet.