From 185831233868b07310b69daefa63b169f1bf8ed4 Mon Sep 17 00:00:00 2001
From: TMRh20 <tmrh20@gmail.com>
Date: Thu, 10 Apr 2014 13:01:51 -0600
Subject: [PATCH] Revert powerUp() delay to 5ms delay

For nRF24L01+ to go from power down mode to TX or RX mode it must first
pass through stand-by mode.
There must be a delay of Tpd2stby (see Table 16.) after the nRF24L01+
leaves power down mode before
the CEis set high.

5ms is the maximum defined in the v1.0 datasheet
---
 RF24.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/RF24.cpp b/RF24.cpp
index 36d8b3f..92659d8 100644
--- a/RF24.cpp
+++ b/RF24.cpp
@@ -573,7 +573,11 @@ void RF24::powerUp(void)
    // if not powered up then power up and wait for the radio to initialize
    if (!(cfg & _BV(PWR_UP))){
       write_register(CONFIG,read_register(CONFIG) | _BV(PWR_UP));
-      delayMicroseconds(1500);
+
+      // For nRF24L01+ to go from power down mode to TX or RX mode it must first pass through stand-by mode.
+	  // There must be a delay of Tpd2stby (see Table 16.) after the nRF24L01+ leaves power down mode before
+	  // the CEis set high. - Tpd2stby can be up to 5ms per the 1.0 datasheet
+      delay(5);
 
    }
 }