old_contents: # CPU frequency scaling example.
  #
  # This example shows how to use the cpufreq module to change the CPU frequency on the fly.
  import sensor, image, time, cpufreq
  
  sensor.reset()                          # Reset and initialize the sensor.
  sensor.set_pixformat(sensor.GRAYSCALE)  # Set pixel format to RGB565 (or GRAYSCALE)
  sensor.set_framesize(sensor.QQVGA)      # Set frame size to QVGA (320x240)
  sensor.skip_frames(time = 2000)         # Wait for settings take effect.
  clock = time.clock()                    # Create a clock object to track the FPS.
  
  def test_image_processing():
      for i in range(0, 50):
          clock.tick()                    # Update the FPS clock.
          img = sensor.snapshot()         # Take a picture and return the image.
          img.find_edges(image.EDGE_CANNY, threshold=(50, 80))
  
  print("\nFrequency Scaling Test...")
  for f in cpufreq.get_supported_frequencies():
      cpufreq.set_frequency(f)
      clock.reset()
      test_image_processing()
      freqs = cpufreq.get_current_frequencies()
      print("CPU Freq:%dMHz HCLK:%dMhz PCLK1:%dMhz PCLK2:%dMhz FPS:%.2f" %(freqs[0], freqs[1], freqs[2], freqs[3], clock.fps()))
  
new_contents: # CPU frequency scaling example.
  #
  # This example shows how to use the cpufreq module to change the CPU frequency on the fly.
  import sensor, image, time, cpufreq
  
  sensor.reset()                          # Reset and initialize the sensor.
  sensor.set_pixformat(sensor.GRAYSCALE)  # Set pixel format to RGB565 (or GRAYSCALE)
  sensor.set_framesize(sensor.QVGA)       # Set frame size to QVGA (320x240)
  clock = time.clock()                    # Create a clock object to track the FPS.
  
  def test_image_processing():
      for i in range(0, 50):
          clock.tick()                    # Update the FPS clock.
          img = sensor.snapshot()         # Take a picture and return the image.
          img.find_edges(image.EDGE_CANNY, threshold=(50, 80))
  
  print("\nFrequency Scaling Test...")
  for f in cpufreq.get_supported_frequencies():
      print("Testing CPU Freq: %dMHz..." %(f))
      cpufreq.set_frequency(f)
      clock.reset()
      test_image_processing()
      freqs = cpufreq.get_current_frequencies()
      print("CPU Freq:%dMHz HCLK:%dMhz PCLK1:%dMhz PCLK2:%dMhz FPS:%.2f" %(freqs[0], freqs[1], freqs[2], freqs[3], clock.fps()))
  
subject: Update cpufreq example.