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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
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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