RPI RMP Guide

RPI Software Setup SDK

Main Github

• Please ask for software support via github
• clone project https://github.com/hzeller/rpi-rgb-led-matrix/tree/master/adapter
• build the binary executable file, and use following commands

make -C examples-api-use

• https://github.com/hzeller/rpi-rgb-led-matrix

Prerequisite Checklist

double check for GPIOs

• turn off => SPI IIC, 1-wire, serial, etc in raspi-config
• turn off => sound in /boot/config.txt -> add line dtparam=audio=off
• optionally remove following modules: sudo apt-get remove bluez bluez-firmware pi-bluetooth triggerhappy pigpio
• optionally disable: audio in kernel

cat <<EOF | sudo tee /etc/modprobe.d/blacklist-rgb-matrix.conf
blacklist snd_bcm2835
EOF

sudo update-initramfs -u

• by following up setup, the GPIO output should be all good

Quick Start Guide

Drive Notice

• The panels of the same size could have different drive (scan) methods, it depends on the panel's driver chip.
• please try different led-multiplexing, from 0~17

--led-multiplexing=0

P8 P10 Outdoor 32x16 (tested)

Run example for our selling 32x16 panel

• P10 - 32x16

./examples-api-use/demo -D 0 --led-cols=32 --led-rows=16 --led-multiplexing=8

./examples-api-use/demo -D 0 --led-cols=32 --led-rows=16 --led-multiplexing=3
./examples-api-use/runtext16.ppm -D 0 --led-cols=32 --led-rows=16 --led-multiplexing=8
./examples-api-use/demo -D 0 --led-cols=32 --led-rows=32 --led-multiplexing=1

• To chain other panel:

 --led-chain=2 to --led-chain=4

• Other example will have the same configuration

--led-rows=8 --led-chain=2

32x32

• multiplexing =1

./examples-api-use/demo -D 0 --led-cols=32 --led-rows=32 --led-multiplexing=1

P4 64x32 (tested)

• multiplexing=0

./examples-api-use/demo -D 0 --led-cols=64 --led-rows=32 --led-multiplexing=0

• Tested panel is 64x32 P4-256x128-2121-A1

P3/P4 64x64 (tested)

Extra Setup Needed

• Setup P4 jumper to ground, P8 jumper to #E line

• multiplexing usually 0 or 1, try further options only when you have special board

CMD for both P3/P4

• ./examples-api-use/demo -D 0 --led-cols=64 --led-rows=64 --led-multiplexing=1

128x128 / 256x128

• Should be not supported

Panel Specifications

Working Panel	Demo code	Panel Specification	Command
32x16 P8 or P10	3216	1/4	./demo -D 0 --led-rows=8 --led-chain=2
32x32 P6	3232	1/8
64x32 P4	NA	1/16
64x64 P4	NA	1/32

Drive Demo

• The following demos are tested at 13th April

• 

  32x16

• 

  32x16 panel specs

• 

  6432 test01

• 

  6432 test02

• 

  64x64 test

• 

  64x64 P3 specs

• 

  64x64 P4 specs

More Types of Demos

• 

  Runtext demo 01

• 

  Runtext demo 02

• ./demo -D 1 runtext.ppm --led-no-hardware-pulse --led-slowdown-gpio=4 --led-cols=64 --led-rows=32

Troubleshooting / Common Debug List

Design Error 2022-Feburary

• Check if you got a quality defective board from us (bad ground pins)

Problem and solution you can find the problem of this here: MPC1073 Error

Multiplexing and Chip Type

• Check the chip type (FM6126A)
• Check the multiplexing, this is how the problem looks like

• 

  Common Multiplexing Issue 01

• 

  Correct Multiplexing setup

• Tested working panel is 64x32, please refer above RPI_RMP_Guide#P4_64x32_.28tested.29

E-line Setup

• Check if your panel is oversize (64x64 is needed) or chained with multiple panels, then you need to setup the E-line
• The normal setup is P4 + GND, and P8 + #E
• Below is how problem looks like
• Problem demo video here: https://fb.watch/c7KIaWjqIr/

• 

  64x64 E-line not setup error issue

Further Help

• If you still have problems, please try the default demo: /rpi-rgb-led-matrix# ./examples-api-use/demo -D 0 --led-cols=64 --led-rows=32 --led-multiplexing=0
• And provide demo images to info@electrodragon.com to check.

FAQs

• Using all 3 chains with rPi 4, is there any GPIO free to use?

No any free pins left except SC / SD pins

• What are SC and SD pin holes?

GPIO0 = SDA0, GPIO7 = SCL0

• What are RX pin hole?

GPIO15, ROW_E pin, can be set to ground