No display with HK1 Box On Armbian about linux_openvfd HOT 9 CLOSED

As I mentioned in the other issue with a similar problem, I've not tested this on 5.x kernel in general, nor on Armbian specifically.
Maybe they have the pins mapped differently in the new/mainline kernel and that's why it doesn't work, I don't really know.

Thank you Arthur! I carefully compared the GPIO mapping between the two systems, and there are indeed some differences, and now I have successfully lit up the LCD screen!

Thank you very much!

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Hi @lChiehZ

Could you please share your working config file or explain how you worked out the correct values? I have got a X96 Air running Manjaro that I failed to get working with openvfd, even tho it works fine with openelec.

Thanks

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BTW, It works fine when I use CoreELEC-Amlogic-ng.arm-19.2-Matrix_rc2 With this vfd.conf:

vfd_gpio_clk='0,65,0'
vfd_gpio_dat='0,64,0'
vfd_gpio_stb='0,0,0xFF'
vfd_chars='0,4,3,2,1'
vfd_dot_bits='0,1,3,2,4,5,6'
vfd_display_type='0x00,0x00,0x00,0x06'

from linux_openvfd.

As I mentioned in the other issue with a similar problem, I've not tested this on 5.x kernel in general, nor on Armbian specifically.
Maybe they have the pins mapped differently in the new/mainline kernel and that's why it doesn't work, I don't really know.

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@lChiehZ Bumping this thread to see if you can post your findings. Curious as well.

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@Jeebus678 see the post from 16th Oct from chbgdn in #8 . I've not tried it yet but please let us know if it works for you.

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Hi @danboid @Jeebus678

Sorry I'm just seeing it now, I don't have the equipment in my hands right now, but I can tell you the points that need attention.
For example, in the dtb file

leds {
    compatible = "gpio-leds";
    status = "okay";
    sys_led {
        label = "sys_led";
        gpios = <0x75 0x0b 0x00>; //0x75 is the phandle for bank@14, note to modify your own
        default-state = "on";
        linux,default-trigger = "default-on";
    };
};

The above code is correct to display the power light normally.

Then check the GPIO mapping of your own device, e.g.
This conf works fine in CoreELEC, the

vfd_gpio_clk='0,65,0'
vfd_gpio_dat='0,64,0'

so check what gpio pins 65 and 64 are in CoreELEC.
Finally, find the corresponding pins in the system you need to use
For example, the last conf I used was.

vfd_gpio_clk='0,64,0'
vfd_gpio_dat='0,63,0'
vfd_gpio_stb='0,0,0xFF'
vfd_chars='0,4,3,2,1'
vfd_dot_bits='0,1,3,2,4,5,6'
vfd_display_type='0x00,0x00,0x00,0x06'

Good luck!

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@lChiehZ

Thank you for the reply. I am trying to work the vfd on a tx mini 3, which is different although I imagine the idea is the same. I'm having trouble mapping the GPIOs. How do I figure out what pins are in charge of the 7-segment, and once I have that declared within my DTB and/or my vfd.conf, how do I actually write to the LCD? Thanks.

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Closing due to lack of activity. Please let me know if you still have an issue with the latest commits pushed recently.

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