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# SPI Control
#
# This example shows how to use the SPI bus on your OpenMV Cam to directly
# the LCD shield without using the built-in lcd shield driver. You will need
# the LCD shield to run this example.
import sensor, image, time
from pyb import Pin, SPI
cs = Pin("P3", Pin.OUT_OD)
rst = Pin("P7", Pin.OUT_PP)
rs = Pin("P8", Pin.OUT_PP)
# The hardware SPI bus for your OpenMV Cam is always SPI bus 2.
# NOTE: The SPI clock frequency will not always be the requested frequency. The hardware only supports
# frequencies that are the bus frequency divided by a prescaler (which can be 2, 4, 8, 16, 32, 64, 128 or 256).
spi = SPI(2, SPI.MASTER, baudrate=int(1000000000/66), polarity=0, phase=0)
def write_command_byte(c):
cs.low()
rs.low()
spi.send(c)
cs.high()
def write_data_byte(c):
cs.low()
rs.high()
spi.send(c)
cs.high()
def write_command(c, *data):
write_command_byte(c)
if data:
for d in data: write_data_byte(d)
def write_image(img):
cs.low()
rs.high()
spi.send(img)
cs.high()
# Reset the LCD.
rst.low()
time.sleep(100)
rst.high()
time.sleep(100)
write_command(0x11) # Sleep Exit
time.sleep(120)
# Memory Data Access Control
write_command(0x36, 0xC0)
# Interface Pixel Format
write_command(0x3A, 0x05)
# Display On
write_command(0x29)
sensor.reset() # Initialize the camera sensor.
sensor.set_pixformat(sensor.RGB565) # must be this
sensor.set_framesize(sensor.QQVGA2) # must be this
sensor.skip_frames(time = 2000) # Let new settings take affect.
clock = time.clock() # Tracks FPS.
while(True):
clock.tick() # Track elapsed milliseconds between snapshots().
img = sensor.snapshot() # Take a picture and return the image.
write_command(0x2C) # Write image command...
write_image(img)
print(clock.fps()) # Note: Your OpenMV Cam runs about half as fast while
# connected to your computer. The FPS should increase once disconnected.
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