Led driver 3clickをLinuxで光らせた。

Posted on Oct 2, 2018

mikrobus準拠の LED Driver 3 click を、Linuxから光らせた。

ドライバは NCP5623B 。レジスタアドレスがないデバイスなところに注意。armbianの動いているclearfogを使たけど、カーネルヘッダが入らなかったので、pythonからi2csetを実行する手抜き。あと、0x00でチップシャットダウン(全てのLEDをOFFにする)になるはずだけど、LEDがチラつくので、事前にPWMで落とすというチート付き。

ncp5623.py

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import os

from enum import Enum

SHUTDOWN = 0x0
MAX_CURRENT = 0x1
PWM1 = 0x2
PWM2 = 0x3
PWM3 = 0x4

def send(reg, val):
    I2CSET="/usr/sbin/i2cset"
    I2CBUS=1
    CHIP_ADDR=0x38

    data_addr = (reg << 5) | (val & 0x1f)
    cmd = '%s -y %s 0x%02x 0x%02x' % (I2CSET, I2CBUS, CHIP_ADDR, data_addr)
    os.system(cmd)

def red(brightness):
    return (brightness, 0, 0)

def green(brightness):
    return (0, brightness, 0)

def blue(brightness):
    return (0, 0, brightness)

def yellow(brightness):
    return (brightness, brightness, 0)

def purple(brightness):
    return (0, brightness, brightness)

def white(brightness):
    return (brightness, brightness, brightness)

def shutdown():
    send(PWM1, 0)
    send(PWM2, 0)
    send(PWM3, 0)
    send(SHUTDOWN, 0)

def max_current(val):
    send(MAX_CURRENT, val & 0x1f)

def blink(r, g, b):
    send(PWM1, r & 0x1f)
    send(PWM2, g & 0x1f)
    send(PWM3, b & 0x1f)

Sample

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#!/usr/bin/python3

from time import sleep

from ncp5623 import shutdown, max_current, blink, red, green, blue, yellow, purp
le, white

def step():
    return (1, 8, 16, 31)

if __name__ == '__main__':
    shutdown()
    max_current(0x1f)
    sleep(1)

    for i in step():
        blink(*red(i))
        sleep(0.4)
    shutdown()
    sleep(0.4)

    for i in step():
        blink(*green(i))
        sleep(0.4)
    shutdown()
    sleep(0.4)

    for i in step():
        blink(*blue(i))
        sleep(0.4)
    shutdown()
    sleep(0.4)

    for i in step():
        blink(*yellow(i))
        sleep(0.4)
    shutdown()
    sleep(0.4)

    for i in step():
        blink(*purple(i))
        sleep(0.4)
    shutdown()
    sleep(0.4)

    for i in step():
        blink(*white(i))
        sleep(0.4)
    shutdown()
    sleep(0.4)