From 92b15c74f0790a89554229eae4a86e0d10578037 Mon Sep 17 00:00:00 2001
From: TMRh20 <tmrh20@gmail.com>
Date: Mon, 20 Jul 2020 17:21:01 -0600
Subject: [PATCH] Add CCW to scanner example

- Add feature to output a CCW on a specified channel and power level to the scanner example per https://github.com/nRF24/RF24/pull/609
- Changed scanner example to use Serial prints instead of printf
- Removed unneeded delays
---
 examples/scanner/scanner.ino | 101 ++++++++++++++++++++++-------------
 1 file changed, 64 insertions(+), 37 deletions(-)

diff --git a/examples/scanner/scanner.ino b/examples/scanner/scanner.ino
index fec9a2791..722486304 100644
--- a/examples/scanner/scanner.ino
+++ b/examples/scanner/scanner.ino
@@ -1,5 +1,6 @@
 /*
  Copyright (C) 2011 J. Coliz <maniacbug@ymail.com>
+ Updated 2020 TMRh20
 
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
@@ -7,18 +8,20 @@
  */
 
 /**
- * Channel scanner
+ * Channel scanner and Continuous Carrier Wave Output
  *
  * Example to detect interference on the various channels available.
  * This is a good diagnostic tool to check whether you're picking a
  * good channel for your application.
+ * 
+ * Run this sketch on two devices. On one device, start CCW output by sending a 'g'
+ * character over Serial. The other device scanning should detect the output of the sending
+ * device on the given channel. Adjust channel and output power of CCW below.
  *
  * Inspired by cpixip.
  * See http://arduino.cc/forum/index.php/topic,54795.0.html
  */
 
-#include <SPI.h>
-#include "nRF24L01.h"
 #include "RF24.h"
 #include "printf.h"
 
@@ -61,24 +64,25 @@ void setup(void)
   // Get into standby mode
   radio.startListening();
   radio.stopListening();
-
   radio.printDetails();
 
+  //delay(1000);
   // Print out header, high then low digit
   int i = 0;
   while ( i < num_channels )
   {
-    printf("%x",i>>4);
+    Serial.print(i>>4,HEX);
     ++i;
   }
   Serial.println();
   i = 0;
   while ( i < num_channels )
   {
-    printf("%x",i&0xf);
+    Serial.print(i&0xf,HEX);
     ++i;
   }
   Serial.println();
+  //delay(1000);
 }
 
 //
@@ -86,42 +90,65 @@ void setup(void)
 //
 
 const int num_reps = 100;
+bool constCarrierMode = 0;
 
 void loop(void)
 {
-  // Clear measurement values
-  memset(values,0,sizeof(values));
-
-  // Scan all channels num_reps times
-  int rep_counter = num_reps;
-  while (rep_counter--)
-  {
-    int i = num_channels;
-    while (i--)
-    {
-      // Select this channel
-      radio.setChannel(i);
-
-      // Listen for a little
-      radio.startListening();
-      delayMicroseconds(128);
+  /****************************************/
+  // Send g over Serial to begin CCW output
+  // Configure the channel and power level below
+  if(Serial.available()){
+    char c = Serial.read();
+    if(c == 'g'){
+      constCarrierMode = 1;
       radio.stopListening();
-
-      // Did we get a carrier?
-      if ( radio.testCarrier() ){
-        ++values[i];
-      }
+      delay(2);
+      Serial.println("Starting Carrier Out");
+      radio.startConstCarrier(RF24_PA_LOW,40);  
+    }else
+    if(c == 'e'){
+      constCarrierMode = 0;
+      radio.stopConstCarrier();
+      Serial.println("Stopping Carrier Out");
     }
   }
+  /****************************************/
+  
+  if(constCarrierMode == 0){
+    // Clear measurement values
+    memset(values,0,sizeof(values));
+
+    // Scan all channels num_reps times
+    int rep_counter = num_reps;
+    while (rep_counter--)
+    {
+      int i = num_channels;
+      while (i--)
+      {
+        // Select this channel
+        radio.setChannel(i);
+
+        // Listen for a little
+        radio.startListening();
+        delayMicroseconds(128);
+        radio.stopListening();
+
+        // Did we get a carrier?
+        if ( radio.testCarrier() ){
+          ++values[i];
+        }
+      }
+    }
+  
 
-  // Print out channel measurements, clamped to a single hex digit
-  int i = 0;
-  while ( i < num_channels )
-  {
-    printf("%x",min(0xf,values[i]));
-    ++i;
-  }
-  Serial.println();
+    // Print out channel measurements, clamped to a single hex digit
+    int i = 0;
+    while ( i < num_channels )
+    {
+      Serial.print(min(0xf,values[i]),HEX);
+      ++i;
+    }
+    Serial.println();
+    
+  }//If constCarrierMode == 0 
 }
-
-// vim:ai:cin:sts=2 sw=2 ft=cpp