search

hzeller / rpi-rgb-led-matrix

Controlling up to three chains of 64x64, 32x32, 16x32 or similar RGB LED displays using Raspberry Pi GPIO
GNU General Public License v2.0
3.69k stars 1.17k forks source link

Raspberry Pi 4 noisy image #861

Closed jaygarcia closed 5 years ago

jaygarcia commented 5 years ago

Just got a Pi4 in and am wondering if anyone's had a chance to try it out w/ this lib? Seems that basic demos that run well on the 3b+ are rendered with noise:

Swap out this setup for a 3b+ and it's perfect :D

Specs:

Demo video below Demo Video

hzeller commented 5 years ago

increase the gpio slowdown value, the pi4 is too fast for most panels.

jaygarcia commented 5 years ago

increase the gpio slowdown value, the pi4 is too fast for most panels.

D: too fast? I had no idea that would be a thing. I'll hit that now and circle back.

Thanks @hzeller =D

jaygarcia commented 5 years ago

confirming --led-slowdown-gpio=2 works perfectly :)

DeepeshKumarKushwaha commented 5 years ago

On RPi 4 When I display text then flickering (noisy text ) is there. When I went through lib it is mentioned that --led-slowdown-gpio values can be 0 to 4 but unable to do 3 or 4.I tried with slowdown-gpio values from 0 to 2 their is a lot of noise.

Command:- sudo python uart_rgb.py --led-rows=32 --led-cols=32 --led-chain=4 --led-parallel=2 --led-multiplexing=1 --led-brightness=100 --led-pwm-bits=4 --led-slowdown-gpio=4 --led-scan-mode=1 --led-rgb-sequence=RGB

Error:-usage: uart_rgb.py [-h] [-r LED_ROWS] [--led-cols LED_COLS] [-c LED_CHAIN] [-P LED_PARALLEL] [-p LED_PWM_BITS] [-b LED_BRIGHTNESS] [-m {regular,adafruit-hat,adafruit-hat-pwm}] [--led-scan-mode {0,1}] [--led-pwm-lsb-nanoseconds LED_PWM_LSB_NANOSECONDS] [--led-show-refresh] [--led-slowdown-gpio {0,1,2}] [--led-no-hardware-pulse LED_NO_HARDWARE_PULSE] [--led-rgb-sequence LED_RGB_SEQUENCE] [--led-pixel-mapper LED_PIXEL_MAPPER] [--led-row-addr-type {0,1,2}] [--led-multiplexing LED_MULTIPLEXING] [-t TEXT] [-i IMAGE] uart_rgb.py: error: argument --led-slowdown-gpio: invalid choice: 3 (choose from 0, 1, 2)

hzeller commented 5 years ago

The range of gpio slowdown is double-checked by the python args parser, which it shouldn't. If you are using samplebase.py, this is fixed in https://github.com/hzeller/rpi-rgb-led-matrix/commit/5e004a96d94112ca5c76b733702e5458baacf70e

DeepeshKumarKushwaha commented 5 years ago

yes now working fine Thanks @hzeller