tjlab-jf3hzb/Digital_VFO_with_analog_dial

Display noise around the top and right-hand edges.

Opened this issue · 4 comments

MartinDavidWaller commented

Hi,

I've bee trying out your code and it all seems fine with the exception of 'noise' around the top end right-hand edges of the display. I was wondering if you had seen this before and what you did to fix it? See image below.

In the UK there has been a recent article in Practical Wireless - October 2022 - https://www.radioenthusiast.co.uk/store/back-issues/practical-wireless/vol-98-no-10-october-2022-issue-214 about using your code and I see that the author has the same issue but does not mention it?

Any help, or guidance, yuo can give me would be much appreciated.

Martin
G0PJO

Display

tjlab-jf3hzb commented

Hi Martin

The noise around the top end right-hand edges of the display
disappears by modifying lines 47 to 52 of "display.cpp" as follows.

//---------------------------------------------------
d_Command(0x2A);
SPI.write(0); SPI.write(0+2); //modified
SPI.write((Xw-1)>>8); SPI.write(Xw-1+2); //modified
d_Command(0x2B);
SPI.write(0); SPI.write(0+1); //modified
SPI.write((Yw-1)>>8); SPI.write(Yw-1+1); //modified
//-------------------------------------------------------

Tj Uebo
JF3HZB

sm0yjw commented
MartinDavidWaller commented

Hi,

Many thanks for the quick reply on this TJ, I'll tryy it out soon. The display in question was one of these:

https://www.ebay.co.uk/itm/185488744237

Perhaps it was the wrong device?

Martin

tjlab-jf3hzb commented

Hi
I don't think it's the wrong device.
Some LCDs with ST7735 driver seem to have offset pixel addresses.

Tj