NeoPixel

The seesaw has built in NeoPixel support for up to 341 pixels (RGB pixels, less if RGBW). The output pin as well as the communication protocol frequency are configurable.

The module base register address for the NeoPixel module is 0x0E.

Function Registers

Register Address

Register Name

Register Size

Notes

0x01

PIN

8 bits

Write Only

0x02

SPEED

8 bits

Write Only

0x03

BUF_LENGTH

16 bits

Write Only

0x04

BUF

32 bytes

Write Only

0x05

SHOW

8 bits

Write Only

PIN (0x01, 8bits, Write Only)

This register sets the pin number (PORTA) that is used for the NeoPixel output.

SPEED (0x02, 8bits, Write Only)

The protocol speed.

0x00 = 400khz

0x01 = 800khz (default)

BUF_LENGTH (0x03, 16bits, Write Only)

the number of bytes currently used for the pixel array. This is dependent on when the pixels you are using are RGB or RGBW.

BUF (0x04, 32 bytes, Write Only)

The data buffer. The first 2 bytes are the start address, and the data to write follows. Data should be written in blocks of maximum size 30 bytes at a time.

Bytes 0 - 1

Bytes 2 - 32

Start address

Data

SHOW (0x05, 8bits, Write Only)

Writing 1 to this register will display the pixels.

Writing zeros to this register has no effect.

Last updated on 2017-11-01 at 05.09.02 PM Published on 2017-11-01 at 05.26.25 PM