testing spi comms and camera

pi/cam_to_spi.py

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+# import the necessary packages
+from picamera.array import PiRGBArray
+from picamera import PiCamera
+import spidev
+import time
+import cv2
+
+# initialize the camera and grab a reference to the raw camera capture
+camera = PiCamera()
+
+export_resolution = (16, 16)
+camera_res = (32, 32)
+
+camera.resolution = camera_res
+camera.framerate = 32
+rawCapture = PiRGBArray(camera, size=camera_res)
+
+# allow the camera to warmup
+time.sleep(0.1)
+
+
+import spidev
+spi = spidev.SpiDev()
+spi.open(0, 0)
+spi.max_speed_hz = 8000000  
+
+# capture frames from the camera
+time_start = time.time()
+frames = 0
+for frame in camera.capture_continuous(rawCapture, format="bgr", use_video_port=True):
+        # grab the raw NumPy array representing the image, then initialize the timestamp
+    # and occupied/unoccupied text
+    image = frame.array
+
+    #grey scale
+    image = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
+
+    # resize
+    if export_resolution != camera_res:
+        image = cv2.resize(image, dsize=export_resolution, interpolation=cv2.INTER_CUBIC)
+
+    #cv2.imshow("Frame", image)
+    key = cv2.waitKey(1) & 0xFF
+
+    #print(image[0])
+    for row in image:
+        spi.xfer(row.tolist())
+    # clear the stream in preparation for the next frame
+    rawCapture.truncate(0)
+
+    # if the `q` key was pressed, break from the loop
+    if key == ord("q"):
+        break
+    frames += 1
+    if frames % 100 == 0:
+        print(time.time() - time_start)
+        time_start = time.time()

pi/spi_test.py

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+import spidev
+
+
+import spidev
+spi = spidev.SpiDev()
+spi.open(0, 0)
+spi.max_speed_hz = 8000000  
+spi.mode = 0b11
+
+
+def send_data(cursor):
+    # send the data
+    spi.xfer([0x21, cursor])
+    #               2 bytes word  len 
+    spi.xfer([0x23, cursor, 0x00, 0x01, 0,0, 0])
+
+
+def get_data(cursor):
+    spi.xfer([0x24, cursor, 0x00, 0x01, 0x00, 0x00, 0])
+    data = spi.xfer([0x22, 0x00,  0])
+    print(data)
+    return data[2]
+
+for cursor in range(100):
+    send_data(cursor)
+    data = get_data(cursor)
+    assert(data == cursor)
+
+#print(spi.readbytes(1))
+#spi.xfer([0x20, 0, 0, 0])
+#print(spi.readbytes(8))