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Old 03-19-2023, 02:08 AM   #41
Per Hansson
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Default Re: LCR T7 tester problem

Your fuse map should be this according to the file attached by stj if you are trying to load the "original" firmware:
Extended: 0xFF (Or 0x07 it depends on the program version how it reads the map, everything should be disabled)
High: 0xD9
Low: 0xE2

If you look in your picture the "high" fuse map is already 0xD9 and extended map is 0x07
So you only need to change the "low" map by deselecting "CKDIV8"
Verify that this changes the low fuse map value at the top from 0x62 to 0xE2
If it does you can program the fuse map.
"The one who says it cannot be done should never interrupt the one who is doing it."

Last edited by Per Hansson; 03-19-2023 at 02:14 AM..
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Old 03-19-2023, 05:15 PM   #42
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Default Re: LCR T7 tester problem

Huston we are gota problem...

I set that low fuse to E2, and connect display and test.
With avrch341a I can not verify flash, say some error... next I get Neo, but he even not try to program, only noted verification problem on 0x2, some time later 0x6, 0x14, 0x5... random.
With neo even when blank erase the chip it want to program it... verification error... say... wtf?

With avrch341a I can program it, without error and without verification passed, but LCR is not work properly, print splash logo with some offset and stuck with some big character who is separate with space...
I try to many time, but not go anywhere...
My first avr... oh...

BTW, on avrch341a read fuse 0x07 0xD9 0xE2
but with neo read 0xFF 0xD9 0xE2... unreliable or what?
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Old Yesterday, 05:22 PM   #43
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Default Re: LCR T7 tester problem

Every time I had to program avr with original firmware, the returned readed hex is simmilar but not the same. The crc32 are completly different, every time randomly, with random verify error.
Last time, I got dots on screen... before it was some big letters...
I was measure voltage when reading, programming, but it not fluctate so much, 3.292 - 3.294... the ams1117-3.3 is capable of about 1A.
I double check every wire, connection, soldering, everything is nice and ok. On pin #5 is some dust, not connection no worry, no shorts or low resistance between pins.
What can cause that behaveous, its partialy work, I mean he programs something simmilar, and that is readable again... is this seen before!?
I am greatly conserned about Neo, he even not try to program... must be a some major mistake?
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