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scripts/examples: Add Joystick example for OLED shield.
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@ -7,6 +7,7 @@ require("lsm6dsox")
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#freeze ("$(OMV_LIB_DIR)/", "bno055.py")
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#freeze ("$(OMV_LIB_DIR)/", "ssd1306.py")
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freeze ("$(OMV_LIB_DIR)/", "ssd1351.py")
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freeze ("$(OMV_LIB_DIR)/", "pca9674a.py")
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#freeze ("$(OMV_LIB_DIR)/", "tb6612.py")
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freeze ("$(OMV_LIB_DIR)/", "vl53l1x.py")
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freeze ("$(OMV_LIB_DIR)/", "machine.py")
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@ -0,0 +1,61 @@
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# This work is licensed under the MIT license.
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# Copyright (c) 2013-2025 OpenMV LLC. All rights reserved.
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# https://github.com/openmv/openmv/blob/master/LICENSE
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#
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# OLED Display with Joystick Example
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#
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# Note: To run this example you will need a OLED Breakout Board for your OpenMV AE3
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#
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# The OLED Breakout Board allows you to view your OpenMV AE3's frame buffer on the go.
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import sensor
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import time
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import display
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from pca9674a import PCA9674A
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from machine import I2C
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sensor.reset()
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sensor.set_pixformat(sensor.RGB565)
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sensor.set_framesize(sensor.VGA)
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sensor.set_windowing((400, 400))
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lcd = display.SPIDisplay(width=128, height=128, controller=display.SSD1351())
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clock = time.clock()
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def read_expander(pin):
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global exp, state
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state = exp.read() ^ 0xFF
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x_scale_def = 128 / 400
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y_scale_def = 128 / 400
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state = 0
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cursor_x = 0
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cursor_y = 0
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exp = PCA9674A(I2C(1), irq_pin="P9", callback=read_expander)
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def update_cursor():
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global cursor_x, cursor_y
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if state & 0x01: # Right
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cursor_x += 2
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if state & 0x02: # Up
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cursor_y -= 2
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if state & 0x04: # Left
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cursor_x -= 2
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if state & 0x08: # Down
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cursor_y += 2
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if state & 0x10: # Center
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cursor_x = 0
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cursor_y = 0
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while True:
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clock.tick()
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update_cursor()
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lcd.write(sensor.snapshot(), x=cursor_x, y=cursor_y,
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x_scale=x_scale_def, y_scale=y_scale_def)
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print(clock.fps())
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50
scripts/libraries/pca9674a.py
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50
scripts/libraries/pca9674a.py
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@ -0,0 +1,50 @@
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# This file is part of the OpenMV project.
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#
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# Copyright (c) 2013-2025 OpenMV LLC. All rights reserved.
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#
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# This work is licensed under the MIT license, see the file LICENSE for details.
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#
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# PCA9674A I2C expander driver.
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from time import sleep_ms
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from machine import Pin
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from micropython import const
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_DEFAULT_ADDR = const(63)
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class PCA9674A:
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def __init__(self, bus, irq_pin, address=_DEFAULT_ADDR, callback=None):
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self.bus = bus
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self.address = address
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self.callback = callback
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self.irq_pin = None
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self.irq_pin_label = irq_pin
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self.state = bytearray(1)
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self.reset()
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def write(self, value):
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self.state[0] = value
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self.bus.writeto(self.address, self.state)
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def read(self):
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self.bus.readfrom_into(self.address, self.state)
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return self.state[0]
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def reset(self):
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if self.irq_pin is not None:
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self.irq_pin.irq(handler=None)
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sleep_ms(10)
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self.bus.writeto(self.address, bytes([0xff]))
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sleep_ms(10)
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self.bus.readfrom(self.address, 1)
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sleep_ms(10)
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self.irq_pin = Pin(self.irq_pin_label, Pin.IN, Pin.PULL_UP)
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if self.callback is not None:
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self.irq_pin.irq(
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handler=self.callback, trigger=Pin.IRQ_FALLING, hard=False
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)
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