Comments (7)
jdinh1
commented on August 19, 2024
1
Thanks for the suggestion! Unfortunately, it did not help with the black bg. I even tried playing around with the hue value but no result.
I did eventually got it to work properly. Turns out the command to set the lcd operational voltage in the st7565_init() function was incorrect. It should have been
st7565_command(CMD_SET_RESISTOR_RATIO | 0x4);
isntead of
st7565_command(CMD_SET_RESISTOR_RATIO | 0x6);
I also noticed various other things in the st7565 driver that needs to be cleaned up and fixed as well. I will submit a PR for it soon.
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embeddedt
commented on August 19, 2024
Try using the mono theme. You'll need to enable it in lv_conf.h and call
lv_theme_set_current.
…On Sun, Jan 20, 2019, 5:12 PM Jonathan Dinh ***@***.*** wrote:
Hi, I'm currently porting lvgl to work with mbed-os using platformio. The
screen I'm using is an ST7565 LCD 128x64 monochrome (specs).
<http://www.newhavendisplay.com/specs/NHD-C12864A1Z-FSRGB-FBW-HT1.pdf> I
was able to get "Hello World!" to draw on the screen, however the entire
screen background is solid black (the text can be seen if the screen is
tilted, see attached images). I'm struggling to figure out what is wrong. I
do have a feeling that my lv_conf.h is mis-configured, so I will keep
digging on my end. If anyone have any ideas or suggestions, please do let
me know.
main.cpp
<https://github.com/jdinh1/lvgl-mbed-test/blob/master/src/main.cpp>
lv_conf.h
<https://github.com/jdinh1/lvgl-mbed-test/blob/master/src/lv_conf.h>
[image: 20190120_132817]
<https://user-images.githubusercontent.com/18290726/51445574-aab59600-1cbb-11e9-99b5-9c9a0d691f12.jpg>
[image: 20190120_132754]
<https://user-images.githubusercontent.com/18290726/51445575-af7a4a00-1cbb-11e9-8981-3b2eec44c5c9.jpg>
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kisvegabor
commented on August 19, 2024
@jdinh1 The setting of CMD_SET_RESISTOR_RATIO is specific to the display, right?
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jdinh1
commented on August 19, 2024
@kisvegabor Yes, it is. The specsheet said to use 0x26, which is what the ST7565 driver in the repo is currently defaulted to. But it was strange that it did not work correctly. I sampled a few other implementations of the same driver, and most seems to use 0x24 or 0x27 so I ended up using 0x24 that and it seems to worked.
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kisvegabor
commented on August 19, 2024
@jdinh1 I see, thank you! Can you send a PR with a comment for this line in the driver?
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jdinh1
commented on August 19, 2024
@kisvegabor Done. Thank you for the awesome library!
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kisvegabor
commented on August 19, 2024
Merged, thank you!
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