# 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()))