# Command line config for 64x32 panel!

**URL:** <https://rpi-rgb-led-matrix.discourse.group/t/command-line-config-for-64x32-panel/244>\
**Category:** Uncategorized\
**Created:** [June 7, 2021, 4:17am UTC](https://rpi-rgb-led-matrix.discourse.group/t/command-line-config-for-64x32-panel/244 "2021-06-07T04:17:22Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![dattasaurabh82](https://avatars.discourse-cdn.com/v4/letter/d/ba9def/32.png) [@dattasaurabh82](https://rpi-rgb-led-matrix.discourse.group/u/dattasaurabh82)\
**Post date:** [June 7, 2021, 4:17am UTC](https://rpi-rgb-led-matrix.discourse.group/t/command-line-config-for-64x32-panel/244/1 "2021-06-07T04:17:22Z")

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I have designed my own active type HAT [[here](https://rpi-rgb-led-matrix.discourse.group/t/hardware-design-opinion/227/3)] following the schematic and pins in the repo.

I’m now trying to test the HW HAT on RPI-3B+ and thus just have put one 64x32 panel on connector 0.

When I run the demo:  
`sudo ./demo -D 0 --led-gpio-mapping=regular --led-rows=32 --led-cols=64 --led-chain=1 --led-brightness=100 --led-show-refresh --led-slowdown-gpio=2`

My out is a bit weird:

 ![WechatIMG560](https://global.discourse-cdn.com/free1/uploads/rpi_rgb_led_matrix/original/1X/3bdbacf39aaca8f348b620f99500643849e2fd83.jpeg)

Not sure what I’m missing?  
If it is HW problem or some how the parameters are not configured properly?

Thanks for any pointers.

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**Author:** ![AxelH](https://avatars.discourse-cdn.com/v4/letter/a/cdc98d/32.png) [@AxelH](https://rpi-rgb-led-matrix.discourse.group/u/AxelH)\
**Post date:** [June 7, 2021, 3:02pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/command-line-config-for-64x32-panel/244/2 "2021-06-07T15:02:49Z")

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Hi dattasaurabh82,

As you use 64 panel you need to properly connect row E. Did you try moving the jumper between pin 4 and 8 ?

You can also try different --led-multiplexing and --led-row-addr-type options.

You don’t have to use --led-gpio-mapping=regular --led-brightness=100 and led-chain=1 as they are default values.

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**Author:** ![dattasaurabh82](https://avatars.discourse-cdn.com/v4/letter/d/ba9def/32.png) [@dattasaurabh82](https://rpi-rgb-led-matrix.discourse.group/u/dattasaurabh82)\
**Post date:** [June 7, 2021, 3:57pm UTC](https://rpi-rgb-led-matrix.discourse.group/t/command-line-config-for-64x32-panel/244/3 "2021-06-07T15:57:57Z")

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> [@dattasaurabh82](#):
>
> led-chain=1 --led-brightness=100 --led-show-refresh --led-slowdown-gpio=2

Ah the jumper parts I over-looked/forgot 😅. Will give it a try and keep here posted