Move master branch from from mios git repo

2014-01-23 00:23:15 +01:00
commit 609d9e5be9
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+
+/*
+ Copyright (C) 2011 James Coliz, Jr. <maniacbug@ymail.com>
+ Copyright (c) 2012 Greg Copeland
+
+ This program is free software; you can redistribute it and/or
+ modify it under the terms of the GNU General Public License
+ version 2 as published by the Free Software Foundation.
+ */
+
+/**
+ * Channel scanner
+ *
+ * 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.
+ *
+ * Inspired by cpixip.
+ * See http://arduino.cc/forum/index.php/topic,54795.0.html
+ */
+
+#include <SPI.h>
+#include "RF24.h"
+#include "printf.h"
+
+// Only display active frequencies
+static const bool activeOnly = true ;
+
+//
+// Hardware configuration
+//
+
+// Set up nRF24L01 radio on SPI bus plus pins 8 & 9
+
+RF24 radio(9,10);
+
+//
+// Channel info
+//
+
+const short num_channels = 128;
+short values[num_channels];
+uint8_t signalMeter[55] ;
+
+//
+// Setup
+//
+
+void setup(void)
+{
+  //
+  // Print preamble
+  //
+
+  Serial.begin(115200);
+  printf_begin();
+  printf("\n\rRF24/examples/scanner/\n\r");
+
+  //
+  // Setup and configure rf radio
+  //
+
+  radio.begin();
+  radio.powerUp() ;
+  radio.setAutoAck(false);
+
+  // Get into standby mode
+  radio.openReadingPipe( 0, 0xFFFFFFFFFFULL ) ;
+  //  radio.setDataRate( RF24_250KBPS ) ; // may fallback to 1Mbps
+  radio.setDataRate( RF24_1MBPS ) ; // may fallback to 1Mbps
+  radio.startListening() ;
+  radio.stopListening() ;
+}
+
+//
+// Loop
+//
+void loop(void)
+{
+  // Clear measurement values
+  memset( values, 0x00, num_channels ) ;
+  printf( "Scanning all available frequencies..." ) ;
+
+  // Repeatedly scan multiple channels
+  for( int channel=0 ; channel < num_channels; channel++ ) {
+    radio.setChannel( channel ) ;
+
+    // Amplify the signal based on carrier bandwidth
+    int ampFactor ;
+    for( int amp=0; amp <= 300; amp++ ) {
+      // Alternate data rates
+      ampFactor = amp%3 ;
+      switch( ampFactor ) {
+      case 0:
+	radio.setDataRate( RF24_250KBPS ) ;
+	break ;
+
+      case 1:
+	radio.setDataRate( RF24_1MBPS ) ;
+	break ;
+
+      default:
+	radio.setDataRate( RF24_2MBPS ) ;
+	break ;
+      }
+
+      // Listen for carrier
+      ampFactor++ ;
+      radio.startListening() ;
+      delayMicroseconds( 6 - ampFactor ) ;
+      radio.stopListening() ;
+
+      // Was carrier detected? If so, signal level based on bandwidth
+      if( radio.testRPD() ) {
+	values[channel] += ampFactor ;
+      }
+    }
+  }
+
+  // Now display our results
+  printf( "Scan completed.\r\n" ) ;
+  for( int channel=0 ; channel < num_channels; channel++ ) {
+    if( !activeOnly || (activeOnly && values[channel] > 0) ) {
+      memset( signalMeter, '*', min( values[channel], 54 ) ) ;
+      signalMeter[min(values[channel], 54)] = 0x00 ;
+      printf( "%03d (%4dMhz): %02d - %s\r\n",
+	      channel,
+	      2400+channel,
+	      values[channel],
+	      signalMeter ) ;
+
+      // Reset the scanned value since its already beend displayed
+      values[channel] = 0 ;
+    }
+  }
+}
+
+// vim:ai:cin:sts=2 sw=2 ft=cpp