RGB led on the Arduino Giga Display Shield

Arduino Boards
1

For those also trying to use the on-board RGB led on the Arduino Giga Display Shield, here is some code that does that - I failed to find any direct documentation.

import machine, time
from machine import I2C

COLOR_WHITE    = (255, 255, 255)
COLOR_OFF      = (  0,   0,   0)
COLOR_RED      = (255,   0,   0)
COLOR_GREEN    = (  0, 255,   0)
COLOR_BLUE     = (  0,   0, 255)

class shield_leds:
    '''
    i2c communication to the rgb LED on the giga display shield
    inspired from https://github.com/arduino-libraries/Arduino_GigaDisplay/blob/main/src/GigaDisplayRGB.cpp
    documentation on https://www.lumissil.com/assets/pdf/core/IS31FL3197_DS.pdf
    '''
    def __init__(self):
        # Initialize I2C bus to get to the rgb led on the display shield
        self.i2c = I2C(4)  # it's I2C4 on PB6 (SCL), PH12 (SDA)
        devices = self.i2c.scan()
        self.addr = 80
        if self.addr not in devices:
            print(f'- rgbLED i2c [{self.addr}] not found in {devices}')
        else:
            print('+ giga display shield on-board led found')

    def writebyte(self, reg, data):
        '''
        writes a single message
        '''
        self.i2c.writeto(self.addr, bytes([0x50]))
        self.i2c.writeto_mem(self.addr, reg, data)  # Write 0xF1 to register 0x01

    def set_rgb(self, color):
        '''
        writes a message to set intensity for each led
        '''
        # start of message
        self.writebyte(0x1, bytes([0xf1]))
        self.writebyte(0x2, bytes([0xff]))
        # intensity codes for the colors from the input tuple
        self.writebyte(0x10, bytes([color[0]]))  # red
        self.writebyte(0x11, bytes([color[1]]))  # green
        self.writebyte(0x12, bytes([color[2]]))  # blue
        # end of message
        self.writebyte(0x2b, bytes([0xc5]))


rgb = shield_leds()
rgb.set_rgb(COLOR_OFF) # leds off
while True:
    time.sleep(1)
    rgb.set_rgb(COLOR_RED)
    time.sleep(1)
    rgb.set_rgb(COLOR_GREEN)
    time.sleep(1)
    rgb.set_rgb(COLOR_BLUE)
1 Like
2

Thanks for posting this for others to use!