RGB LED Matrix

SK9822 RGB LED

Datasheets

• SK9822 Datasheet

Description

The 3 x 3 LED matrix uses SK9822 leds. These are also known as a clone from the APA102C RGB leds. These leds have 4 built in pwm generators. For the red, green and blue channel three times a 8 bit pwm and for the global brightness a 5 bit pwm.

Warning

Each led consumes up to 200mW. It is not recommended to look at the leds directly.

Indices

Each LED has an index that is used when setting individul LED colors.

Usage

Note

When enabling the LEDs, SPIA wil be set to mode 3

Example to set LED 1 and 7

CC++

RGBA8 color = { 0x08, 0, 0, 0x04 };

// Enable the leds
yggdrasil_RGBMatrix_Enable();

// Set led 1 and 7
yggdrasil_RGBMatrix_SetLed(1, color);
yggdrasil_RGBMatrix_SetLed(7, color);

// Send the data to the leds
yggdrasil_RGBMatrix_Flush();

Example to set all LEDs at one. In this case LED 0, 2, 4, 6 and 8 will be set

CC++

RGBA8 color = { 0x08, 0, 0, 0x04 };

// Enable the leds
yggdrasil_RGBMatrix_Enable();

// Set led 0, 2, 4, 6 and 8
yggdrasil_RGBMatrix_SetLedMasked(0b101'010'101, color);

// Send the data to the leds
yggdrasil_RGBMatrix_Flush();

Example to use the dice function, which will display the number as a dice would show it.

CC++

RGBA8 color = { 0x08, 0, 0, 0x04 };

// Enable the leds
yggdrasil_RGBMatrix_Enable();

// Display number 6
yggdrasil_RGBMatrix_Dice(6, color);

// Send the data to the leds
yggdrasil_RGBMatrix_Flush();

Example to show all possible colors

CC++

RGBA8 color = { 0, 0, 0, 0x01 };
float cnt = 0;
yggdrasil_RGBMatrix_Enable();

while(1) {

    // Calculate the color value from 0 to 255 with a 120° phase shift
    color.r = (u8)(((sin(cnt) + 1) * 255) / 2.0F);
    color.g = (u8)(((sin(cnt + 2/3.0F * M_PI) + 1) * 255) / 2.0F);
    color.b = (u8)(((sin(cnt + 4/3.0F * M_PI) + 1) * 255) / 2.0F);


    yggdrasil_RGBMatrix_SetLedMasked(0b111'111'111, color);
    yggdrasil_RGBMatrix_Flush();

    cnt += 0.01;
    core_Delay(10);
}